MECHANICAL STEP ATTENUATOR
R&K-PT120(1/31)-0S/3.3V
R&K-PT120(1/31)-0S/5.0V■ Broadband Frequency :DC ～ 2500MHz■ Attenuation :1dB Step/5Bit/31dB■ High Power :＋40dBm(avg.)■ Input Intercept Point :＋75.0dBm(min.)■ RoHS Compliance
SPECIFICATIONSOUTLINE DRAWING: DC ~ 2500MHz
Frequency Range: 2.0dB (max.)
Insertion Loss (DC-1.5GHz): 3.5dB (max.)(1.5GHz- 2.5GHz): 31dB / 1, 2, 4, 8, 16dB
Attenuation Range / Steps
Attenuation Accuracy: ±1.0dB (max.)(DC-1.5GHz): ±1.5dB (max.)(1.5GHz-2.5GHz): 50Ω
Impedance: 1.5 : 1 (typ.)
Input /Output VSWR
Logic Input (DC Drive/Standard) : ＋3.3V = Att Setting / 0V = Zero Setting＋5.0V = Att Setting / 0V = Zero Setting(DC Drive/Option)(TTL Drive/Option-1) : High = Att Setting / Low = Zero Setting(TTL Drive/Option-2) : High = Zero Setting / Low = Att Setting: 5ms (max.) tRise / tFall
Switching Speed: ＋3.3V±0.5V 120mA (max.) / Step
DC Supply Input (Standard): ＋5.0V±0.5V 100mA (max.) / Step
DC Supply Input (Option): ＋75.0dBm (min.)
Input Intercept Point: ＋40.0dBm (avg.)
Maximum RF Input Power: －20℃ to + 60℃
Operating Temperature: －20℃ to + 80℃
Storage Temperature: SMA-FEMALE
Connectors (Standard): BNC-FEMALE
Connectors (Option): 550g (typ.)
Weight (Standard)※IN MILLIMETERS

2020584030

PORT2PORT14-Φ3.5 THRU

8854.5

150
160
170

15.5
8GND

1.5

16dB

8dB

4dB

2dB

1dB

100

HOW TO ORDER

90

IIP3 (dBm)

Model Name

PT120(1/31)-0S/3.3V0 = DC Drive
1 = TTL Drive(Normal)
2 = TTL Drive(Invert)

S = SMA - FEMALE
3.3V
B = BNC - FEMALE
5.0V
N = N - FEMALE※BNC Operational to 1GHz

8070

50
40
30

0

22.5

Normalized Attenuation

-5

3
124
8360

←

-15

←

-25-301

1.5

2Frequency (GHz)

2.504
30

16
REF

1.5

22.5

3

Frequency (GHz)

2.5

1

←
1.0

284

31

Frequency (GHz)

1.5←2-180

0.5

1180

-35
00.5

00.5

11.5

2Frequency (GHz)

2.5

3CH1CH2CH1 :CONT V:2V/Div H:5ms/Div
CH2 :RF V:200mV/Div H:5ms/Div* Rev. 1.1 : Feb./12/2015
R&K reserves the right to make changes in the specifications of or discontinue products at any time
without notice. R&K products shall not be used for or in connection with equipment that requires anextremely high level of reliability and safety such as aerospace uses or medical life support equipment.
Further, the export of R&K products from Japan may be subject to an export license by the governmentof Japan, based on Japan's "Foreign Exchange and Foreign Trade Law".

3:100MHz/0dBm
Switching Speed RFCONT:10Hz/Duty 20%

Phase vs Attenuation State

←

31-20

Phase (deg)16-100.5

←←

1.5

1.4

←

1.0

Frequency (GHz)

80←
←←←

0.53

←

7-1.5

2.5

311.8

←

-1.02

←6

←
←

16

-0.5

5

1.5

←

4

1Frequency (GHz)

2.2

31

0.5

0.5

VSWR Port 1 and Port 2

2.6

←

321

VSWR

1.0

Bit Error (dB)

1.5

2

←

Insertion Loss (dB)

Attenuation Accuracy

2.0

1REF

Attenuation (dB)0Insertion Loss0

IIP3 : +75dBm (min.)

60

TYPICAL PERFORMANCE0Input Intercept Point

P18×4=7249MECHANICAL STEP ATTENUATOR
R&K-PT120(1/31)-0S/3.3V
Mechanical & Electrical Life Test / Test Report
TEST CONDITIONS
Voltage
Operation frequency
Input power
Switching speed
Duty
Ambient temperature
Operation

MEASURING BLOCK DIAGRAM

3.3V DC
1000MHz
10W (+40dBm)
1sec.
50%
Room temperature6
1×10 switching times

SignalGenerator

Amplifier

D.U.T
PT120

Attenuator

Mixer

Power
SupplyPhoto MOS
Relay

Pulse
Generator

SignalGenerator

Oscilloscope

TEST RESULT
Insertion Loss / ATT=0dB Setting
2.6

12.4at 100kHz0-1

2.22.0at 1.5GHz

VSWR

Insertion Loss (dB)

Port1 VSWR / ATT=0dB Setting

2-2at 2.5GHz

1.8-3

1.6-4

1.4-5

1.2

at 2.5GHz

at 1.5GHz

at 100kHz
IN

10203040 50 60 70
×10000 CYCLE

8090

IN

100

2030

40 50 60 70
×10000 CYCLE

8090

100

Port2 VSWR / ATT=0dB Setting

Normalized Attenuation / at 2.5GHz
2.65REF

1dB

2.4-52dB
4dB

2.28dB-10-15

2.0VSWR

Attenuation (dB)

1016dB

at 2.5GHz

1.8-201.6-251.4

at 1.5GHz1.2-3032dB
IN10203040 50 60 70
×10000 CYCLE

8090at 100kHz
100R&K reserves the right to make changes in the specifications of or discontinue products at any time
without notice. R&K products shall not be used for or in connection with equipment that requires anextremely high level of reliability and safety such as aerospace uses or medical life support equipment.
Further, the export of R&K products from Japan may be subject to an export license by the governmentof Japan, based on Japan's "Foreign Exchange and Foreign Trade Law".

IN10203040 50 60 70
×10000 CYCLE80

90100