LT5503
1.2GHz to 2.7GHz Direct
IQ Modulator and Mixer

OBSOLETE:

FOR INFORMATION PURPOSES ONLY

Contact Linear Technology for Potential Replacement

Features

Description

Single 1.8V to 5.25V Supply
nn Direct IQ Modulator with Integrated 90° Phase
Shifter*nn 4-Step RF Power Control
nn 120MHz Modulation Bandwidthnn Independent Double-Balanced Mixer
nn Modulation Accuracy Insensitive to Carrier Input
Powernn Modulator I/Q Inputs Internally Biased
nn Available in 20-Lead FE Package

The LT®5503 is a front-end transmitter IC designed forlow voltage operation. The IC contains a high frequency
quadrature modulator with a variable gain amplifier (VGA)
and a balanced mixer. The modulator includes a precision
90° phase shifter which allows direct modulation of an RF
signal by the baseband I and Q signals.

nn

In a superheterodyne system, the mixer can be used togenerate the high frequency RF input for the modulator by
mixing the system’s 1st and 2nd local oscillators.
The LT5503 modulator output P 1dB is –3dBm at 2.5GHz.
The VGA allows output power reduction in three steps
up to 13dB with digital control. The baseband inputs areinternally biased for maximum input voltage swing at low
supply voltage. If needed, they can be driven with externalbias voltages.

Applications
IEEE 802.11 DSSS and FHSSHigh Speed Wireless LAN (WLAN)
nn Wireless Local Loop (WLL)
nn PCS Wireless Data
nn MMDSnn
nn

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Patents pending.

Typical Application
2.45GHz Transmitter Application, Carrier for Modulator Generated by Upmixer
2.45GHzBPFSSB Output Power vs
I, Q Amplitude

VCC1
2V

VCC2
2V

0

SSB OUTPUT POWER (dBm)–5

BQ+ BQ–MIXER
ENABLE
MODULATORENABLE
LO2IN(750MHz)MX –VCCLO2 VCCLO1

MX +MODIN VCCRF

VCCMODVCCVGA

MIXEN
MODEN
LO2

MODOUT
VGA

0°

÷2

90°

÷1

5.25 VDC

3 VDC
1.8 VDC

–10
–15
–20
–25
–30
–35
–40

CONTROL
LOGIC

LT5503GND

DMODE

GC1 GC2LO15503 TA01

LO1IN (2075MHz)

BI+ BI–

2.45GHz
MODULATED
RFOUT

–45
0.1
10
0.01
1
I, Q DIFFERENTIAL INPUT VOLTAGE (VP-P)
5503 G04

5503faFor more information www.linear.com/LT5503

1

LT5503
Absolute Maximum Ratings(Note 1)

Pin Configuration
TOP VIEW

Supply Voltage......................................................... 5.5V
Control Voltages........................... –0.3V to (VCC + 0.3V)
Baseband Voltages (BI+ to BI– and BQ+ to BQ –)........±2V
Baseband Common Mode Voltage......1V to (VCC – 0.3V)
LO1 Input Power.....................................................4dBm
LO2 Input Power.....................................................4dBm
MODIN Input Power................................................4dBm
Operating Temperature Range..................­– 40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................... 300°C

BQ –

1

20 BI –

BQ+

2

19 BI+

GC1 3

18 GC2

MODIN 4VCCMOD 5
VCCRF 6LO1 7

17 MODOUT
21

16 VCCVGA
15 VCCLO2
14 LO2VCCLO1 8

13 MODEN

DMODE 912 MIXEN

MX + 1011 MX –FE PACKAGE
20-LEAD PLASTIC TSSOPTJMAX = 150°C, θJA = 38°C/W
EXPOSED PAD IS GND (PIN 21)
MUST BE SOLDERED TO PCB

Order Information
LEAD FREE FINISH

TAPE AND REELPART MARKINGPACKAGE DESCRIPTIONTEMPERATURE RANGEOBSOLETE PARTLT5503EFE#PBF

LT5503EFE#TRPBF

5503

20-Lead Plastic TSSOP–40°C to 85°C

Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/2

5503faFor more information www.linear.com/LT5503

LT5503
Electrical Characteristics (I/Q Modulator)
VCC1 = 3VDC, 2.4GHz matching, MODEN = High, GC1 = GC2 = Low, TA = 25°C, MODRFIN = 2.45GHz at –16dBm, [I – IB] and [Q – QB] =100kHz CW signal at 1VP-P differential, Q leads I by 90°, unless otherwise noted. (Test circuit shown in Figure 2.) (Note 3)
PARAMETERCONDITIONS

MIN

TYP

MAX

UNITS

RF Carrier Input (MODRFIN)
Frequency Range2

Requires Appropriate Matching

Input VSWR

ZO = 50Ω

1.2 to 2.7

GHz

1.3:1

Input Power–20 to –10

dBm

Frequency Bandwidth (3dB)

120

MHz

Differential Input Voltage for 1dB Compressed Output

1

VP-P

1.4

VDC

Differential Input Resistance18kΩ

Input Capacitance

0.8

pF

Gain Error

±0.2

dB

Phase Error

±1

DEG

–3

dBm

Baseband Inputs (BI+, BI–, BQ+, BQ–)DC Common Mode Voltage

Internally Biased

Modulated RF Carrier Output (MODRFOUT)
Output Power, Max Gain
Output VSWR

–6
ZO = 50Ω

1.5:1

Image Suppression

–26

–34

Carrier Suppression

–24

–32

dBc

–3

dBm

Output 1dB Compression

dBc

Output 3rd Order Intercept

f1 = 100kHz, fQ = 120kHz

2dBm

Output 2rd Order Intercept

f1 = 100kHz, fQ = 120kHz

16

dBm

Broadband Noise

20MHz Offset–142

dBm/HzSwitching Time

100

ns

Input Current

2µA

VGA Control Logic (GC2, GC1)

Input Low Voltage

0.4

Input High Voltage

1.7

VDC
VDC

Output Power Attenuation

GC2 = Low, GC1 = High

4.5

dB

Output Power Attenuation

GC2 = High, GC1 = Low

9dB

Output Power Attenuation

GC2 = High, GC1 = High

13.5

dB

1

µs

Modulator Enable (MODEN) Low = Off, High = On
Turn ON/OFF Time
Input Current

105

µA

VCC – 0.4

EnableVDC

Disable

0.4

VDC

5.25

VDC

38

mA

50

µA

Modulator Power Supply Requirements
Supply Voltage

1.8

Modulator Supply Current

MODEN = High

Modulator Shutdown Current

MODEN = Low

29

5503faFor more information www.linear.com/LT5503

3

LT5503
Electrical Characteristics (Mixer)
VCC2 = 3VDC, 2.4GHz matching, MIXEN = High, DMODE = Low (LO2 ÷ 2 mode), TA = 25°C, LO2IN = 750MHz at –18dBm, LO1IN =2075MHz at –12dBm. MIXRFOUT measured at 2450MHz, unless otherwise noted. (Test circuit shown in Figure 2.) (Note 3)
PARAMETERCONDITIONS

MIN

TYP

MAX

UNITS

Mixer 2nd LO Input (LO2IN)
Frequency Range

Internally Matched

Input VSWR

ZO = 50Ω

50 to 1000

MHz

1.4:1

Input Power–20 to –12

dBm

1400 to 2400

MHz

Mixer 1st LO Input (LO1IN)
Frequency Range2

Requires Appropriate Matching

Input VSWR

ZO = 50Ω

1.5:1

Input 3rd Order Intercept–30dBm/Tone, ∆f = 200kHz

–12

dBm

1700 to 2700

MHz

Mixer RF Output (MIXRFOUT)
Frequency Range2

Requires Appropriate Matching

Output VSWR

ZO = 50Ω

Small-Signal Conversion Gain

PLO1 = –30dBm

1.5:1
5

dB

Output Power

–14.7

–12.7

dBm

LO1 Suppression

–22

–29

dBc

Output 1dB Compression
Broadband Noise

20MHz Offset

–15

dBm

–152

dBm/HzLO2 Divider Mode Control (DMODE) Low = fLO2 ÷ 2, High = fLO2 ÷ 1
Input Current

1

Input Low Voltage (÷2)µA
0.4

VCC – 0.4

Input High Voltage (÷1)

VDC
VDC

Mixer Enable (MIXEN) Low = Off, High = On
Turn ON/OFF Time1µs

Input Current

130

µA

VCC – 0.4

EnableVDC

Disable

0.4

VDC

5.25

VDC

15.5

mA

Mixer Power Supply Requirements
Supply Voltage

1.8

Supply Current (÷2 mode)

DMODE = Low, MIXEN = High

11.9

Supply Current (÷1 mode)

DMODE = High, MIXEN = High

10.8

Shutdown Current

MIXEN = Low

Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.

4

mA
10

µA

Note 2: External component values on the final test circuit shown in
Figure 2 are optimized for operation in the 2.4GHz to 2.5GHz band.
Note 3: Specifications over the –40°C to 85°C temperature range areassured by design, characterization and correlation with statistical processcontrols.

5503faFor more information www.linear.com/LT5503

LT5503
Typical Performance Characteristics (I/Q Modulator)

VCC1 = 3VDC, 2.4GHz matching, MODEN = high, GC1 = GC2 = low (max gain), TA = 25°C, MODRFIN = 2.45GHz at –16dBm, (I–IB) and(Q–QB) = 100kHz sine at 1VP-P differential, Q leads I by 90°, unless otherwise noted. (Test circuit shown in Figure 2.)
Modulator Shutdown Current vs
Supply Voltage

Modulator Supply Current vs
Supply Voltage
100
TA = 85°C

34

SHUTDOWN CURRENT (µA)

SUPPLY CURRENT (mA)

36

32
TA = 25°C

30
28
26
24

220

MODEN = LOW

200

10TA = 85°C

1
TA = 25°C

20
1.8

0.1
1.8

5.3

4.6
2.5
3.9
3.2
VCC1 SUPPLY VOLTAGE (V)

2.4

3.0
3.6
4.2
SUPPLY VOLTAGE (V)

4.8

MODRFIN and MODRFOUT
Return Loss 2.4GHz Matching

MODRFOUT

–10

–10
–15
–20
–25
–30

–20

–30
MODRFINCARRIER

–40
0.1

5.4

5.3
5503 G03

RETURN LOSS (dB)OUTPUT POWER (dBm)

OUTPUT POWER (dBm)

4.6
3.9
3.2
MODEN VOLTAGE (V)

0

–35

IMAGE
10

1
I, Q INPUT FREQUENCY (MHz)5503 TA01b

5503 G05

–40
2050

2250

2450
2650
FREQUENCY (MHz)2850
5503 G06

Typical SSB Spectrum
0
–10
–20
–30
POUT (dBm)

1.8

2.5

DESIREDSIDEBAND–5

PLO1 = –12dBm
PLO2 = –18dBm
BASEBAND = 1VP-P
TA = 25°C

TA = –40°C

40
1.8

5.3

4.6
2.5
3.9
3.2
VCC1 SUPPLY VOLTAGE (V)

0

–2

–6

100

Baseband Frequency Response
I/Q Amplitude = 1VP-P–4

TA = 25°C

120

5503 G02

2.45GHz Modulated Output
Power vs Supply Voltage

–5

140

60

TA = –40°C

5503 G01–3

TA = 85°C

160

80

TA = –40°C

22

MODEN = VCC1180
INPUT CURRENT (µA)

38

MODEN Current vs Enable
Voltage

–40
–50
–60
–70
–80
–90
–100
2449.6 2449.8

2450.0 2450.2 2450.4
FREQUENCY (MHz)2450.65503 G07

5503faFor more information www.linear.com/LT5503

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LT5503
Typical Performance Characteristics (I/Q Modulator)

2.4GHz matching, MODEN = high, GC1 = GC2 = low (max gain), MODRFIN = 2.45GHz, (I–IB) and (Q–QB) = 100kHz sine at 1VP-P
differential, Q leads I by 90°, unless otherwise noted. (Test circuit shown in Figure 2.)–6

CARRIER SUPPRESSION (dBc)–4
SSB OUTPUT POWER (dBm)–20

TA = 25°C
TA = –40°C–8
TA = 85°C

–10
–12
–14
–16

–20

–30

IMAGE SUPPRESSION (dBc)–2

Image Suppression vs Input
Power VCC1 = 1.8V

Carrier Suppression vs Input Power
VCC1 = 1.8V

SSB Output Power vs Input Power
VCC1 = 1.8V

TA = 25°C
TA = –40°C–40
TA = 85°C–30

TA = 25°C

TA = –40°C–40

TA = 85°C

–18
–20
–24

–22 –20 –18 –16 –14 –12
MODRFIN INPUT POWER (dBm)

–50
–24

–10

–22 –20 –18 –16 –14 –12
MODRFIN INPUT POWER (dBm)–22 –20 –18 –16 –14 –12
MODRFIN INPUT POWER (dBm)

5503 G09

5503 G08

SSB Output Power vs Input Power
VCC1 = 3V–105503 G10

Carrier Suppression vs Input Power
VCC1 = 3V

Image Suppression vs Input Power
VCC1 = 3V

–20

0

–20

–4 TA = –40°C–6–8

TA = 85°C

–10
–12
–14

–30

IMAGE SUPPRESSION (dBc)

CARRIER SUPPRESSION (dBc)

TA = 25°C–2
SSB OUTPUT POWER (dBm)

–50
–24

–10

TA = 25°C
TA = –40°C–40

TA = 85°C–30

TA = 25°C
TA = –40°C
TA = 85°C–40–16–22 –20 –18 –16 –14 –12
MODRFIN INPUT POWER (dBm)

–50
–24

–10

–22 –20 –18 –16 –14 –12
MODRFIN INPUT POWER (dBm)

TA = –40°C

CARRIER SUPPRESSION (dBc)

SSB OUTPUT POWER (dBm)

–4
–6
–8

Image Suppression vs Input Power
VCC1 = 5.25V–20

TA = 25°C

TA = 85°C

–10
–12
–14

–30

–20

TA = 25°C
TA = –40°C

–40

–10

5503 G13

Carrier Suppression vs Input Power
VCC1 = 5.25V

SSB Output Power vs Input Power
VCC1 = 5.25V–2–22 –20 –18 –16 –14 –12
MODRFIN INPUT POWER (dBm)

5503 G125503 G11

0

–50
–24

–10

IMAGE SUPPRESSION (dBc)

–18
–24

TA = 85°C–30

TA = 25°C
TA = –40°C–40

TA = 85°C

–16
–18
–24

–22 –20 –18 –16 –14 –12
MODRFIN INPUT POWER (dBm)–105503 G14

6

–50
–24

–22 –20 –18 –16 –14 –12
MODRFIN INPUT POWER (dBm)–105503 G15–50–24–22 –20 –18 –16 –14 –12
MODRFIN INPUT POWER (dBm)–105503 G16

5503faFor more information www.linear.com/LT5503

LT5503
Typical Performance Characteristics (I/Q Modulator)
VCC1 = 3VDC, MODEN = high, TA = 25°C, PMODRFIN = –16dBm, (I–IB) and (Q–QB) = 100kHz sine at 1VP-P differential, Q leads I by 90°,
unless otherwise noted. (Test circuit shown in Figure 2.)
Output Power vs Frequency
1.2GHz Matching

Carrier Feedthrough vs Frequency
1.2GHz Matching

0

–30

–30

GC2, GC1 = 00

–2

GC2, GC1 = 00

–4

GC2, GC1 = 00
01

–8
–10
–12

10

–14
–16

–40

IMAGE (dBm)–6

CARRIER (dBm)

SSB OUTPUT POWER (dBm)

SSB Image vs Frequency
1.2GHz Matching

01
10

–50

01

–40

10
11
–50

11

11

–18
–20
1000

1100
1200
1300
MODRFIN FREQUENCY (MHz)

–60
1000

1400

1100
1200
1300
MODRFIN FREQUENCY (MHz)Output Power vs Frequency
1.9GHz Matching

SSB Image vs Frequency
1.9GHz Matching

–30

–30
GC2, GC1 = 00

GC2, GC1 = 00

1400
5503 G19

Carrier Feedthrough vs Frequency
1.9GHz Matching

2
0

1100
1200
1300
MODRFIN FREQUENCY (MHz)5503 G18

5503 G17

GC2, GC1 = 00

–2
01

–6
–8

10

–10
–12

01

–40

IMAGE (dBm)–4

CARRIER (dBm)

SSB OUTPUT POWER (dBm)

–60
1000

1400

10
11

–50

01

–40

10
11

–50

11

–14
–16

1750
1850
1950
2050
MODRFIN FREQUENCY (MHz)

–60
1650

2150

1750
1850
1950
2050
MODRFIN FREQUENCY (MHz)5503 G20

–30

01

10

–12
–14

–30

GC2, GC1 = 00

01

–8
–10

SSB Image vs Frequency
2.4GHz Matching

GC2, GC1 = 00

–4
CARRIER (dBm)

SSB OUTPUT POWER (dBm)

GC2, GC1 = 00

2150
5503 G22

Carrier Feedthrough vs Frequency
2.4GHz Matching

0

–6

1750
1850
1950
2050
MODRFIN FREQUENCY (MHz)5503 G21

Output Power vs Frequency
2.4GHz Matching
–2

–60
1650

2150

–40

10

IMAGE (dBm)

–18
1650

11
–50

–40

01
10
11

–50

11

–16
–18
2250

2350
2450
2550
MODRFIN FREQUENCY (MHz)2650
5503 G23

–60
2250

2350
2450
2550
MODRFIN FREQUENCY (MHz)2650
5503 G24

–60
2250

2350
2450
2550
MODRFIN FREQUENCY (MHz)2650
5503 G25

5503faFor more information www.linear.com/LT5503

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LT5503
Typical Performance Characteristics (Mixer)

2.4GHz matching, MIXEN = high, DMODE = low (LO2 ÷ 2 mode), LO2IN = 750MHz at –18dBm, LO1IN = 2075MHz. MIXRFOUT measured
at 2450MHz, unless otherwise noted. (Test circuit shown in Figure 2.)
Mixer Supply Current vs Supply
Voltage (LO2 ÷ 2 Mode)
14

14

13

100

DMODE = HIGHTA = 85°C

MIXEN = LOW

TA = 25°C

12
11

TA = –40°C

10

SHUTDOWN CURRENT (µA)

13
SUPPLY CURRENT (mA)

SUPPLY CURRENT (mA)

Mixer Shutdown Current vs Supply
Voltage

Mixer Supply Current vs Supply
Voltage (LO2 ÷ 1 Mode)

TA = 85°C

12

TA = 25°C

11
10

TA = –40°C

9

9

8

8

10
TA = 85°C
1

TA = 25°C
1.8

5.3

2.5
3.2
3.9
4.6
VCC2 SUPPLY VOLTAGE (V)1.8

TA = 25°C–20

TA = 85°C

–22

–14

–24

–18
–20
–22

TA = –40°C

TA = 25°C
TA = 85°C–24–28–30 –27 –24 –21 –18 –15 –12 –9
LO1IN POWER (dBm)–28–30 –27 –24 –21 –18 –15 –12 –9
LO1IN POWER (dBm)–6

LO1 Feedthrough vs LO1 Input
Power (VCC2 = 1.8V)

–35

–6

1195 G32

TA = 85°C–24

LO1 Feedthrough vs LO1 Input
Power (VCC2 = 5.25V)
–20

–25

TA = 85°C
TA = 25°C–30–61195 G31

LO1 FEEDTHROUGH (dBc)

LO1 FEEDTHROUGH (dBc)

LO1 FEEDTHROUGH (dBc)

TA = 85°C

–30

8

–22

TA = 25°C–28–30 –27 –24 –21 –18 –15 –12 –9
LO1IN POWER (dBm)

–6

–20

–40
–30 –27 –24 –21 –18 –15 –12 –9
LO1IN POWER (dBm)–20

LO1 Feedthrough vs LO1 Input
Power (VCC2 = 3V)

TA = –40°C

TA = 25°C–18

TA = –40°C

1195 G30

1195 G29

–25

–16

–26

–26

–26

–20

MIXRFOUT POWER (dBm)–18

MIXRFOUT POWER (dBm)

MIXRFOUT POWER (dBm)

–12

–14
–16

5.3

RF Output Power vs LO1 Input
Power (VCC2 = 5.25V)–12
TA = –40°C

TA = –40°C

2.5
3.2
3.9
4.6
VCC2 SUPPLY VOLTAGE (V)5503 G28

RF Output Power vs LO1 Input
Power (VCC2 = 3V)

–12

–16

1.8

5503 G27

RF Output Power vs LO1 Input
Power (VCC2 = 1.8V)
–14

5.3

2.5
3.2
3.9
4.6
VCC2 SUPPLY VOLTAGE (V)5503 G26

0.1

TA = –40°C

–35

–40
–30 –27 –24 –21 –18 –15 –12 –9
LO1IN POWER (dBm)–61195 G33–25
TA = 25°C–30

TA = 85°C

TA = –40°C

–35

–40
–30 –27 –24 –21 –18 –15 –12 –9
LO1IN POWER (dBm)–61195 G34

5503faFor more information www.linear.com/LT5503

LT5503
Typical Performance Characteristics (Mixer)
VCC2 = 3VDC, MIXEN = high, DMODE = low (LO2 ÷ 2mode), TA = 25°C, unless otherwise noted. (Test circuit shown in Figure 2.)
Small-Signal Conversion Gainand IIP3 1.9GHz Matching

OUTPUT
POWER

6

–10

4

–20

–18

–30

LO1
FEEDTHROUGH

–40

–20

–22
1650

2

–9

0

–12

IIP3

–15
LO2IN = 480MHz AT –18dBm
LO1IN = fRF –240MHz AT –30dBm/TONE

–4
1650

6

–10

4

LO1IN

–30
1100 1300 1500 1700 1900 2100 2300 2500
FREQUENCY (MHz)5503 G37

LO1
FEEDTHROUGH
–30

–18

–3
SMALL-SIGNALCONVERSION
GAIN

–9

2
IIP3

0

–12

–15
LO2IN = 750MHz AT –18dBm
LO1IN = fRF –375MHz AT –30dBm/TONE

LO2IN = 750MHz AT –18dBm
LO1IN = fRF –375MHz AT –12dBm

–4
2250

–50
2650

0
–5

–6

–2

–40

–20

LO1 and MIXRFOUT Return Loss
2.4GHz Matching

–18
2650

2350
2550
2450
RF OUTPUT FREQUENCY (MHz)5503 G39

5503 G38

IIP3 (dBm)

–20

–16

CONVERSION GAIN (dB)0LO1 (dBc)–10
MIXRFOUT

–15
LO1
–20
–25

–30
1450 1650 1850 2050 2250 2450 2650 2850
FREQUENCY (MHz)5503 G40

MIXEN Input Current vs Enable
Voltage (MIXEN = VCC2)300
270

TA = 85°C

240
INPUT CURRENT (µA)

RF OUTPUT (dBm)

OUTPUTPOWER

MIXRFOUT–20

Small-Signal Conversion Gainand IIP3 2.4GHz Matching

–12

2350
2550
2450
RF OUTPUT FREQUENCY (MHz)–155503 G36

RF Output Power and LO1
Feedthrough 2.4GHz Matching

–22
2250

–10

–25

–18
2150

1750
1950
2050
1850
RF OUTPUT FREQUENCY (MHz)5503 G35

–14

–5

–6

SMALL-SIGNALCONVERSION
GAIN

–2

–50
2150

1750
1950
2050
1850
RF OUTPUT FREQUENCY (MHz)0

RETURN LOSS (dB)

LO2IN = 480MHz AT –18dBm
LO1IN = fRF –240MHz AT –12dBm–3

IIP3 (dBm)–16

LO1 (dBc)

RF OUTPUT (dBm)–140

CONVERSION GAIN (dB)–12

LO1IN and MIXRFOUT Return Loss
1.9GHz Matching

RETURN LOSS (dB)

RF Output Power and LO1
Feedthrough 1.9GHz Matching

210

TA = –40°C

180
150

TA = 25°C

120
90
60
30
1.8

2.5

3.9
3.2
MIXEN VOLTAGE (V)

4.6

5.3
5503 G41

5503faFor more information www.linear.com/LT5503

9

LT5503
Pin Functions
BQ– (Pin 1): Negative Baseband Input Pin of the Modulator
Q-Channel. This pin is internally biased to 1.4V, but canalso be overdriven with an external DC voltage greaterthan 1.4V, but less than VCC – 0.4V.

MIXEN (Pin 12): Mixer Enable Pin. When the input voltage is higher than VCC – 0.4V, the mixer circuits supplied
through pins 8, 10, 11 and 15 are enabled. When the input
voltage is less than 0.4V, these circuits are disabled.

BQ+ (Pin 2): Positive Baseband Input Pin of Modulator
Q-Channel. This pin is internally biased to 1.4V, but canalso be overdriven with an external DC voltage greaterthan 1.4V, but less than VCC – 0.4V.

MODEN (Pin 13): Modulator Enable Pin. When the input
voltage is higher than VCC – 0.4V, the modulator circuits
supplied through pins 5, 6, 16 and 17 are enabled. When the
input voltage is less than 0.4V, these circuits are disabled.

GC1 (Pin 3): Gain Control Pin. This pin is the least significant bit of the 4-step modulator gain control.

LO2 (Pin 14): Mixer 2nd LO Input Pin. This pin is internallybiased and should be AC-coupled. An external matching
network is not required, but can be used for improved
matching to a 50Ω source.

MODIN (Pin 4): Modulator Carrier Input Pin. This pin isinternally biased and should be AC-coupled. An external
matching network is required for a 50Ω source.
VCCMOD (Pin 5): Power Supply Pin for the I/Q Modulator.
This pin should be externally connected to the other VCC
pins and decoupled with 1000pF and 0.1µF capacitors.
VCCRF (Pin 6): Power Supply Pin for the I/Q Modulator
Input RF Buffer and Phase Shifter. This pin should beexternally connected to the other VCC pins and decoupledwith 1000pF and 0.1µF capacitors.
LO1 (Pin 7): Mixer 1st LO Input Pin. This pin is internallybiased and should be AC-coupled. An external matching
network is required for a 50Ω source.
VCCLO1 (Pin 8): Power Supply Pin for the Mixer LO1 Circuits. This pin should be externally connected to the other
VCC pins and decoupled with 1000pF and 0.1µF capacitors.
DMODE (Pin 9): Mixer 2nd LO Divider Mode Control Pin.
Low = divide-by-2, High = divide-by-1.
MX+ (Pin 10): Mixer Positive RF Output Pin. This pin must
be connected to VCC through an external matching network.
MX– (Pin 11): Mixer Negative RF Output Pin. This pin must

be connected to VCC through an external matching network.

VCCLO2 (Pin 15): Power Supply Pin for the Mixer LO2
Circuits. This pin should be externally connected to theother VCC pins and decoupled with 1000pF and 0.1µF
capacitors.
VCCVGA (Pin 16): Power Supply Pin for the Modulator
Variable Gain Amplifier. This pin should be externallyconnected to the other VCC pins through a 47Ω resistor
and decoupled with a good high frequency capacitor (2pF
typical) placed close to the pin.
MODOUT (Pin 17): Modulator RF Output Pin. This pin
must be externally biased to VCC through a bias choke. An
external matching network is required to match to 50Ω.
GC2 (Pin 18): Gain Control Pin. This pin is the most significant bit of the 4-step modulator gain control.
BI+ (Pin 19): Positive Baseband Input Pin of the Modulator
I-Channel. This pin is internally biased to 1.4V, but canalso be overdriven with an external DC voltage greaterthan 1.4V, but less than VCC­ ­– 0.4V.
BI– (Pin 20): Negative Baseband Input Pin of the Modulator
I-Channel. This pin is internally biased to 1.4V, but canalso be overdriven with an external DC voltage greaterthan 1.4V, but less than VCC – 0.4V.
Exposed Pad (Pin 21): Circuit Ground Return for the Entire IC. This must be soldered to the printed circuit board
ground plane.

105503faFor more information www.linear.com/LT5503

LT5503
Block Diagram

BQ+
2

BQ–
1

BI–
20

V-I

BI+
19

V-I

VCCMOD 5
16 VCCVGA
VGA

17 MODOUTVCCRF 618 GC2RFBUFFER

90°

CONTROL
LOCIC

0°

3 GC1

MODIN 4VCCLO1 8

MODULATOR BIAS CIRCUITS

13 MODEN

MIXER BIAS CIRCUITS

12 MIXEN

LO1
BUFFER

15 VCCLO2
LIM

LO1 7

21

10

GND
(BACKSIDE)

11

MX+ MX–

÷2
÷1

LIM

9

14 LO25503 BD

DMODE

5503faFor more information www.linear.com/LT5503

11

LT5503
Test Circuit
21 (BACKSIDE)

C17
1µF
QB

Q

GND
LT5503

1

BQ –

BI –

20

2

BQ+

BI+

19

C15
1µF
3
GC1
GC1
C3

L3

4

MODRFIN

18

GC2

MODIN

C18
1µF
IB

I

GC2

VCC1

C20
1000pF
C4

6

MODRFOUT
R2
47Ω

L4

7

LO1IN

16

VCCMOD VCCVGA
VCCRF

C23

R1

C7

VCC1
C19
0.01µF

C22
1000pF

14

LO2

L1

C1
2.2pF

15

VCCLO2

LO1

C2

L2

17

MODOUT

C10
5

C16
1µF

C11
8

C43
8.2pF

9

DMODE

10
C12
1000pF

VCC2

C210.01µFL5C5VCCLO1

MODEN

DMODE

MIXEN

MX +

MX –

12

LO2IN
MODEN

C14
100pF

MIXEN

11

L6

C13
8.2pF

4

2

1
C9

13

3

C6

5
T1

MIXRFOUT

NOTE: VCC1 AND VCC2 POWER THE
MODULATOR AND UPMIXERSECTIONS RESPECTIVELY.
5503 F01

L1
L2
L3
C2, C3, C7
C10
C23
R1
C4
C5, C6
C9
C11
L4
L5,L6
T1

Application Dependent Component Values
1.2GHz Matching(Modulator Only)
1.9GHz Matching
2.4GHz Matching
33nH
22nH
18nH
12nH
5.6nH
2.7nH
12nH
4.7nH
2.7nH
39pF
15pF
8.2pF
2.7pF
1.8pF
1.2pF
n/a
1.5pF
1.5pF
240Ω
390Ω
390Ω
n/a
15pF
8.2pF
n/a
1.8pF
2.2pF
n/a
15pF
2.7pF
n/a
2.2pF
1.2pF
n/a
6.8nH
4.7nH
n/a
5.6nH
2.2nH
n/a
LDB211G9010C-001 LDB212G4005C-001

Figure 1. Test Schematic for 1.2GHz, 1.9GHz and 2.4GHz Applications

125503faFor more information www.linear.com/LT5503

LT5503
Applications Information
The LT5503 consists of a direct quadrature modulator anda mixer. The mixer operates over the range of 1.7GHz to
2.7GHz, and the modulator operates with an output rangeof 1.2GHz to 2.7GHz. The LT5503 is designed specificallyfor high accuracy digital modulation with supply voltages
as low as 1.8V. It is suitable for IEEE 802.11b wireless
local area network (WLAN), MMDS and wireless local loop
(WLL) transmitters.

loss. The balanced output from the modulator is applied
to a variable gain amplifier (VGA) that provides a singleended output. Note that the modulator can also be used
independently of the mixer, freeing the mixer to be usedanywhere in the system. In this case, MODRFIN will be
driven from an external frequency source.

A dual-conversion RF system requires two local oscillators
to convert signals between the baseband and RF domains(see Figure 2). The LT5503’s double-balanced mixer can beused to generate the LT5503 modulator’s high frequency
carrier input (MODRFIN) by mixing the systems 1st and2nd local oscillators (LO1 and LO2). In this case, a bandpass filter is required to select the desired mixer output
for the modulator input. The mixer’s RF differential output
produces –­ 12dBm typically at 2.45GHz and the modulator MODIN pin requires ≥ –16dBm, driven single-ended.
This allows approximately 4dB margin for bandpass filter

The baseband I and Q inputs (BI+/BI – and BQ+/BQ–) are
internally biased to 1.4V to maximize the input signal
range at low supply voltage. This bias voltage is stable
over temperature, and increases by approximately 50mV
at the maximum supply voltage. The modulator I andQ inputs have very wide bandwidth (120MHz typical),making the LT5503 suitable for even the most wideband
modulation applications. For best carrier suppression andlowest distortion, differential input drive should be used.
Single-ended drive is possible too, with the unused inputs
AC-coupled to ground.

LT5500Modulator Baseband

LT5502
LT5506

I

A/D

90°

LNA

÷2
0°
Q

1ST LO

A/D

2ND LO

LT5503

VGA

÷2

90°
0°

÷1

I

Q

D/A

D/A
5503 F02

Figure 2. Example System Block Diagram for a Dual Conversion System
5503faFor more information www.linear.com/LT5503

13

LT5503
Applications Information
AC-Coupled Baseband. Figure 3 shows the simplified circuit
schematic of a high-pass AC-coupled baseband interface.
CCPL

BI+ LT5503

CCPL

BI–

CCPL

BQ+

I
18k

0.8pF

IB

Figure 4 shows a simplified circuit schematic for interfacing the LT5503’s baseband inputs to the outputsof a D/A converter. OIP and OIN are the positive andnegative baseband outputs, respectively, of the converter’s
I-channel. Similarly, OQP and OQN are the positive andnegative baseband outputs, respectively, of the converter’s
Q-channel.

0.8pF
Q
CCPL

BQ–

IINPUT

BI+ LT5503

IINPUTBI–IINPUT

BQ+

IINPUT

BQ–

OIP
18k

0.8pF

0.8pF

0.8pF

D/A
5505 F03

OQP

Figure 3. AC-Coupled Baseband Interface

With approximately 18k of differential input resistance,
the suggested minimum AC-coupling capacitor can be
determined using the following equation:(18 • 103 • π • fC )

0.8pF

0.8pF
5505 F04

Figure 4. DC-Coupled Baseband Interface

Modulator RF Input (MODRFIN)

where fC is the 3dB cut-off frequency of the baseband
input signal.
A larger capacitor may be used where the settling timeof charging and discharging the AC-coupling capacitor
is not critical.
DC-Coupled Baseband. The baseband inputs’ internal bias
voltage can be overdriven with an external bias circuit. Thisfacilitates direct interfacing to a D/A converter for fastertransient response. In this case, the LT5503’s baseband
inputs are DC biased by the converter. The optimal VBIAS
is 1.4V, independent of VCC. In general, the maximum
VBIAS should be less than VCC – 0.4V. The DC load oneach converter output can be approximated using thefollowing equation where IINPUT is the current flowing
into a modulator input:

The modulator RF input buffer is driven single ended. Aninternal active balun circuit produces balanced signals
to drive the integrated phase shifter. Limiters following
the phase shifter output accommodate a wide range of
MODRFIN power, resulting in minimal degradation ofmodulation gain/phase accuracy performance or carrier
feedthrough. This pin is easily matched to a 50Ω sourcewith the simple lowpass network shown in Figure 1. Thispin is internally biased, therefore an AC-coupling capacitor is required.
Modulator VGA (Variable Gain Amp)
The VGA has two digital selection lines to provide anominal 0dB, 4.5dB, 9dB and 13.5dB attenuation fromthe maximum modulator output power setting. The logic
table is shown below:

VBIAS − 1.4V
9kΩGC2
ATTENUATION
GC1

14

18k

OQN

1

IINPUT =

0.8pF

OIN

QB

CCPL =

18k

LOW

HIGH

Low

0dB

9dB

High

4.5dB

13.5dB
5503faFor more information www.linear.com/LT5503

LT5503
Applications Information
Pin 16 should be connected externally to VCC through a
low value series resistor (47Ω typical). To assure proper
output power control, a good, local high frequency AC
ground for Pin 16 is essential. The MODOUT port of the
VGA is an open collector configuration. An inductor withhigh self resonance frequency is required to connect
Pin 17 to VCC as a DC return path, and as a part of theoutput matching network. Additional matching components
are required to drive a 50Ω load as shown in Figure 1. The
amplifier is designed to operate in Class A for low distortion performance. The typical output 1dB compression
point (P1dB) is –­ 3dBm at 2.45GHz. When the differential
baseband input voltages are higher than 1VP‑P, the VGA
operates in Class AB mode, and the distortion performanceof the modulator is degraded. The logic control inputs do
not draw current when they are low. They draw about 2µA
each when high.
Mixer LO1 Port
The mixer LO1 input port is the linear input to the mixer. It
consists of an active balun amplifier designed to operateover the 1.4GHz to 2.4GHz frequency range. There is a linear relationship between LO1 input power and MIXRFOUT
power for LO1 input levels up to approximately –­20dBm.
After that, the mixer output begins to compress. When
operated in the recommended ­–14dBm to –8dBm input
power range, the mixer is well compressed, which in turncreates a stable output level for the modulator input. As
shown in Figure 1, a simple lowpass matching network
is required to match this pin to 50Ω. This pin is internallybiased, therefore an AC-coupling capacitor is required.

MX + 10The mixer LO2 port is designed to operate in the 50MHz
to 1000MHz range. The first stage is a limiting amplifier.
This stage produces the correct output levels to drive theinternal divider circuit reliably, with LO2 input levels down
to –20dBm. The output of the divider then drives anotherstage, which in turn switches the nonlinear inputs of the
double-balanced mixer. Note that the mixer output willproduce broadband noise if the LO2 signal level is too low.
The input amplifier is designed for a good match over theentire frequency range. The only requirement (Figure 1)
is an external AC-coupling capacitor.
Mixer Output Ports (MX+/MX–)
The mixer output is a differential open collector configuration. Bias current is supplied to these two pins throughthe center tap of a balun as shown in Figure 1. Simple
lowpass matching is used to transform each leg of themixer output to 25Ω for the balun’s 50Ω input impedance.
The balun approach provides the highest output powerand best LO1 suppression, but is not absolutely necessary. It is also possible to match each output to 50Ω andcouple power from one output. The unused output shouldbe terminated in the same characteristic impedance. In
this case, output power is approximately 2dB lower andLO1 suppression degrades to approximately 15dBc. A
schematic for this approach is shown in Figure 6 where
inductors LB + and LB– supply bias current to the mixer’s
differential outputs, and resistor RTERM terminates theunused output.

11 MX –

L5
LB+
C5
C9
MIXRFOUT

Mixer LO2 Port

VCC

1.9GHz

L6
LB–
RTERM
51Ω

2.4GHz

L5,L6

5.6nH

2.7nH

C5, C6

1.8pF

0.68pF

C9

15pF

8.2pF

C6

CBYPASS
5503 F05

Figure 5. 50Ω Mixer Output Matching Without a Balun
5503faFor more information www.linear.com/LT5503

15

LT5503
Applications Information
Evaluation Board

RF Layout Tips:

Figure 6 shows the circuit schematic of the evaluation
board. The MODRFIN, MODRFOUT and MIXRFOUT ports
are matched to 50Ω at 2.45GHz. The LO1IN port is matched
to 50Ω at 2.1GHz and the LO2IN port is internally matched.

• Use 50Ω impedance transmission lines up to thematching networks, use of a ground plane is a must.

A 390Ω resistor is used to reduce the quality factor (Q)of the modulator output and deliver an output power of–3dBm typically. A lower value resistor may be used if thedesired output power is lower. For example, the output
power will be 3dB lower if a 200Ω resistor is used.

• Surface mount 0402 outline (or smaller) parts arerecommended to minimize parasitic inductances andcapacitances.

Inductors with high self-resonance frequency should be
used for L1 to L6.
For simpler evaluation in a lab environment, the evaluation
board includes op amps to convert single-ended I and Q
input signals to differential . The op amp configuration has
a voltage gain of two; therefore the peak baseband input
voltage should be halved to maintain the same RF output
power. The op amp configuration shown will maintainacceptable differential balance up to 10MHz typically.
It is also possible to bypass the op amps and drive themodulator’s differential inputs directly by connecting to
the four oversized vias on the board (V1, V2, V3 and V4).
Figure 6 also shows a table of matching network values
for designs centered at 1.9GHz and 1.2GHz.
Figure 7 shows the evaluation board with connectors andICs. Figure 8 shows the test set-up with the upconverting
mixer and IQ modulator connected in a transmit configuration. Refer to the demo board DC365A Quick Start Guidefor detailed testing information.

16• Keep the matching networks as close to the pins as
possible.

• Isolate the MODOUT pin from the LO2 input by putting
the LO2 transmission line on the bottom side of theboard.
• The only ground connection is through the exposed padon the bottom of the package. This exposed pad must
be soldered to the board in such a way to get complete
RF contact.
• Low impedance RF ground connections are essential
and can only be obtained by one or more vias tying
directly into the ground plane.
• VCC lines must be decoupled with low impedance,broadband capacitors to prevent instability.
• Separate power supply lines should be used to isolate
the MODIN signal and other stray signals from the
MODOUT line. If possible, power planes should be used.
• Avoid use of long traces whenever possible. Long RF
traces in particular can lead to signal radiation anddegraded isolation, as well as higher losses.

5503faFor more information www.linear.com/LT5503

LT5503
Applications Information
E4
VCC4
J1

VCC4
C33
4.7µF
5

Q-IN
R3
56Ω
1%

R13
510Ω
1%

8

+

C27
0.01µF

C32
4.7µF

C29
0.01µF

C28
4.7µF

7
U2-1
R14
LT1807
510Ω
1%
–
4 R17
6
510Ω

8
7

1%

R18
4
510Ω
1%

C16
1µF

C15
R25 1µF
49.9Ω

C35, 39pF

U3-1
LT1807

R28
49.9Ω

+
–

2

R21
10k
1%
R23
10k
1%

+

U2-2
LT1807

R19
510Ω
1%

C41
1µF
OPT

1
C17
1µF V1

R26
49.9Ω

2

3
*C3

J2

*L3

MODRFIN
*C10

4

5

E1
VCC1
C20
1000pF
*C4

J3

*L4

LO1IN

C43
8.2pF

E3 R29
10Ω

*C11

7

9

C12
1000pF

C45
0.1µF

10

SW1
1
2
3
4
5
6

6

8

VCC2

12
11
10
9
8
7

R5
20k

R6
20k

R7
20k

R8
2.7k

R4
2.7k

E2

*C5

C21
0.01µF

C13
8.2pF

VCC2

J7
MIXER
OUT

*C9

R20
510Ω
1%
1

C42
1µF
OPT

1

V2

VCC3
C24
4.7µF

J4
I-IN

R15
510Ω
1%
6

R16
510Ω
1%

R12
56Ω
1%

C38, 1pF

–

3

C40
4.7µF

5

C36, 39pF

C37, 1pF

VCC4

C34
4.7µF

BQ –

LT5503
BI –

BQ+

BI+

GC1

GC2

MODIN

MODOUT

VCCMOD VCCVGA
VCCRF

VCCLO2LO1LO2VCCLO1

MODEN

DMODE

MIXEN

MX +

MX –

*L5

GND
21

C18
1µF

V3

20

19

2

1

+

VCC4

2

R22
10k
1%

3

C39
4.7µF

*C2

*L2

18

R24
10k
1%

J5
MODRFOUT

17

*L1

*C23

*R1

R2
47Ω

16

15

14

–

V4

VCC1

VCC2

C14
100pF

J6
LO2IN
C22
1000pF

13

C1
*C7
2.2pF

C19
0.01µF

12

11
*L6

*C6

4

R27
49.9Ω

U3-2
LT18073
5T15503 F06

L1
L2
L3
C2, C3, C7
C10
C23
R1
C4
C5, C6
C9
C11
L4
L5,L6
T1

*Application Dependent Component Values
1.2GHz Matching(Modulator Only) 1.9GHz Matching
2.4GHz Matching
33nH
22nH
18nH
12nH
5.6nH
2.7nH
12nH
4.7nH
2.7nH
39pF
15pF
8.2pF
2.7pF
1.8pF
1.2pF
n/a
1.5pF
1.5pF
240
390
390
n/a
15pF
8.2pF
n/a
1.8pF
2.2pF
n/a
15pF
2.7pF
n/a
2.2pF
1.2pF
n/a
6.8nH
4.7nH
n/a
5.6nH
2.2nH
n/a
LDB211G9010C-001 LDB212G4005C-001

Figure 6. Evaluation Circuit Schematic for 1.2GHz, 1.9GHz and 2.4GHz Applications

For more information www.linear.com/LT5503

5503fa17

LT5503
Applications Information
QIN

IIN

VCC4
GND

VCC1
LT1807

V2

LT1807V3V1V4MODRFIN

MODRFOUT

LT5503
IC

LO1IN

LO2IN

GND

1
2
3
4
5
6

VCC2

VCC3

5503 F07

MIXRFOUT

Figure 7. LT5503 Evaluation Board Layout

18

5503faFor more information www.linear.com/LT5503

LT5503
Applications Information+–

DUAL SIGNAL
GENERATORPOWER SUPPLY 4

0°

+

90°

–
QIN

POWER SUPPLY 1

IIN

VCC4
GND
LT1807

MODRFIN

V2

SPECTRUM
ANALYZER

LT1807V3V1V4MODRFOUT
SIGNALGENERATOR 1
LT5503IC
LO1IN
GND VCC2+
POWER SUPPLY 2

SIGNALGENERATOR 1
1
2
3
4
5
6

LO2IN
VCC3

+
–

POWER SUPPLY 3

MIXRFOUT–
EXTERNAL 3dB
ATTENUATOR PAD,
OR 2.45GHz BPF
5503 F08

Figure 8. Test Set-Up for Upconverting Mixer andI/Q Modulator Transmit Chain Measurements.

5503faFor more information www.linear.com/LT5503

19

LT5503
Package Description

Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
FE Package
20-Lead Plastic TSSOP (4.4mm)(Reference LTC DWG FE# 05-08-1663
Package Rev K)
ExposedPad
Variation
CB (4.4mm)
20-LeadPlastic
TSSOP(Reference LTC DWG # 05-08-1663 Rev K)
Exposed Pad Variation CB
DETAIL A

6.40 – 6.60*(.252 – .260)
3.86(.152)

3.86(.152)

0.60(.024)
REF
0.28(.011)
REF

20 1918 17 16 15 14 13 12 116.60 ±0.102.74(.108)

4.50 ±0.10

DETAIL A

6.40
2.74 (.252)(.108) BSC

SEE NOTE 4

0.45 ±0.05

DETAIL A IS THE PART OF
THE LEAD FRAME FEATUREFOR REFERENCE ONLYNO MEASUREMENT PURPOSE

1.05 ±0.10
0.65 BSC

1 2 3 4 5 6 7 8 9 10RECOMMENDED SOLDER PAD LAYOUT

4.30 – 4.50*(.169 – .177)

0.09 – 0.20(.0035 – .0079)

0.25
REF

NOTE:
1. CONTROLLING DIMENSION: MILLIMETERSMILLIMETERS
2. DIMENSIONS ARE IN(INCHES)

200° – 8°0.65(.0256)
BSC

0.50 – 0.75(.020 – .030)

3. DRAWING NOT TO SCALE

1.20(.047)
MAX

0.195 – 0.30(.0077 – .0118)
TYP

0.05 – 0.15(.002 – .006)
FE20 (CB) TSSOP REV K 0913

4. RECOMMENDED MINIMUM PCB METAL SIZEFOR EXPOSED PAD ATTACHMENT*DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASHSHALL NOT EXCEED 0.150mm (.006") PER SIDE

5503faFor more information www.linear.com/LT5503

LT5503
Revision History
REV

DATE

DESCRIPTIONPAGE NUMBER

A

10/15

Obsolete Product

1, 25503faInformation furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnectionof its circuits
as describedherein will not infringe on existing patent rights.
For more
informationwww.linear.com/LT5503

21

LT5503
Related Parts
PART NUMBER DESCRIPTIONCOMMENTS

LT5500

RF Front End

Dual LNA Gain Setting +13.5dB/–14dB at 2.5GHz, Double-Balanced Mixer,
1.8V ≤ VSUPPLY ≤ 5.25V

LT5502400MHz Quadrature Demodulator with RSSI

1.8V to 5.25V Supply, 70MHz to 400MHz IF, 84dB Limiting Gain, 90dB RSSI Range

LT5504800MHz to 2.7GHz RF Measuring Receiver

80dB Dynamic Range, Temperature Compensated, 2.7V to 5.5V Supply

LTC5505

300MHz to 3.5GHz RF Power Detector>40dB Dynamic Range, Temperature Compensated, 2.7V to 6V Supply

LT5506500MHz Quadrature IF Demodulator with VGA

1.8V to 5.25V Supply, 40MHz to 500MHz IF, –4dB to 57dB Linear Power Gain®

LTC 5507

100kHz to 1GHz RF Power Detector

48dB Dynamic Range, Temperature Compensated, 2.7V to 6V Supply

LTC5508

300MHz to 7GHz RF Power Detector

SC70 Package

LTC5509

300MHz to 3GHz RF Power Detector

36dB Dynamic Range, SC70 Package

LT5511High Signal Level Up Converting Mixer

RF Output to 3GHz, 17dBm IIP3, Integrated LO Buffer

LT5512High Signal Level Down Converting Mixer

DC-3GHz, 20dBm IIP3, Integrated LO Buffer

LT5515

1.5GHz to 2.5GHz Direct Conversion Demodulator

20dBm IIP3, Integrated LO Quadrature Generator

LT5516

0.8GHz to 1.5GHz Direct Conversion Quadrature
Demodulator

21.5dBm IIP3, Integrated LO Quadrature Generator

LT5522600MHz to 2.7GHz High Signal Level Mixer

25dBm IIP3 at 900MHz, 21.5dBm IIP3 at 1.9GHz, Matched 50Ω RF and LO Ports,
Integrated LO Buffer

LTC5532

300MHz to 7GHz Precision RF Power Detector

Precision VOUT Offset Control, Adjustable Gain and Offset Voltage

22 Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417
For more information www.linear.com/LT5503(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com/LT5503

5503faLT 1015 REV A • PRINTED IN USA

 LINEAR TECHNOLOGY CORPORATION 2001