Euvis

Differential Limiting Amplifier, LA302Z

High-Speed Data Communication
LA302Z – 10 GHz Differential Limiting Amplifier
16-pin Plastic QFN Package
PRODUCT DESCRIPTION
The LA302Z is an ultra-broadband fully differential limiting amplifier designed for highspeed wide-band communication applications up to 10 Gb/s. The amplifier has an
excellent input sensitivity of 2.5 mVpp and a small-signal bandwidth of 10 GHz. Its wide
bandwidth and high sensitivity ensure a low bit error rate in high-speed datacommunication. Its lost-of-signal detector can warn the receiver as the incoming signal is
too small for a certain bit error rate. The device can be used as an input sensing amplifier,a repeater, and a wide-band single-ended-to-differential converter.

KEY FEATURES• 37-dB gain
• 10 GHz bandwidth• < 2.5 mVpp single-ended/differential input sensitivity• Differential 50-Ω inputs and outputs• 750m-Vpp maximum differential output swing• Lost-of-Signal (LOS) detector• Output waveform envelope detector• Output waveform crossing control• Power consumption: 0.3 W with +5 V single power supply

BLOCK DIAGRAM

VREF

LOS
ENVP
EnvelopeDetector

IPOP
DriverIN
CC

Rev. 8B4_C, 11/14/08

ON
CrossingControl

1EuvisDifferential Limiting Amplifier, LA302Z

ELECTRICAL SPECIFICATIONS
Testing Condition: VCC = 5 V

Parameter

SymbolMin

TypicalMax

Unit

Operating TemperatureTo−402585o

Small-Signal Max Gain1Go,max

3843dB

Small-Signal 3-dB Bandwidth

f3dB,max

8.310GHz

600

750mVppOutput Swing1 (RL=50Ω)

C

Worst Input Return Loss2RLI

58dB

Worst Output Return Loss2RLO

37dB

3

Tr

3136ps

Output Fall Time3Tf

2226ps

Output Rise Time

Output Overshoot

04Output Jitter, RMS

1.25Sensitivity

Output DC Offset

6%
1.6psVsen

2.5mVpp

Voff510mV

Positive VCC supply Voltage

VCC

4.55

5.5

V

Positive VCC supply Current

Itotal506070mA

12Rev. 8B4_C, 11/14/08

differential I/O
DC to f3dB measured on an evaluation board with SMA connectors
320%~80%
4for Input 500 mVpp,single ended
5where bit error rate < 10–12 with 231-1 pseudo-random data
6
measured with zero inputs

2EuvisDifferential Limiting Amplifier, LA302ZTERMINAL DESCRIPTIONI/O

NameFunction

VEEGround

DC

VCC

Power, +5 V

DCIPData Input+

IN

Data Input−

CC

Output Crossing Control

OP

Output +ON

Output −LOS

Lost-Of-Signal Detector

VCS

VCS Generator Bypass

ENVP
VREF

Rev. 8B4_C, 11/14/08

Signal

II

RFI
O

DCOO

RFRF

RF

DC
DC

Output Swing EnvelopeOO

Reference Voltage for LOS

IDCDC

3

EuvisDifferential Limiting Amplifier, LA302ZPIN ARRANGEMENTS AND PACKAGE INFORMATION• Unit: mm• Package Format: 16-pin QFN• Package Size: 3 mm x 3 mm
• Pin Pitch: 0.5 mm

3VEE

4IN

VREF

ENVP

VCC

EUVIS302Z
VEE

IP

13VCC

214CC

Pin1VEE

15VCS

116LOSTop View

5678VEE

12OP

11VEE

10ON

9MetalLead

30.025

Seating
Plane

30.5

1.45

1.45

0.4

0.23
0.9

Bottom View

Rev. 8B4_C, 11/14/08

Side View

4EuvisDifferential Limiting Amplifier, LA302Z

TYPICAL CONNECTION

Reference Output
Voltage Envelope
VCC

R1C2C3C4ENVP

VREF

LOS

C1VCC

Lost-of-Signal
Detector

Pin1VEE

VEE

EUVIS
302Z

CB2IP

VEE
CB1CB3T3OP

RFOutputs

VEE
CB4IN

T4VEE

ON
VCS

T1VCC

RFInputs

CC

T2VCC
C7

VR1C5C6Notes:
VCC is +5 V
VEE’s are connected to power supply and package ground
Center pad of package is connected to ground
T1~ T4: 50-Ω transmission lines
VR1: 50-kΩ potentiometer
R1: 1-kΩ surface-mount resistor
C1 ~ C5 and C7: 100-nF surface-mount capacitors
C6: 10-µF capacitor
CB1 ~ CB4: 100-nF by-pass surface-mount capacitors

Rev. 8B4_C, 11/14/08

5EuvisDifferential Limiting Amplifier, LA302ZEYE DIAGRAM MEASUREMENT
The following figures show the typical eye diagrams with differential inputs of 2 Vpp, 500mVpp, 50 mVpp and 5mVpp. The measurements are with 10-Gb/s 231-1 pseudo-random bit
sequences.

Vin: 2 VPP

375 mVPP

Vin: 500 mVPP

375 mVPP

Vin: 50 mVPP

375 mVPP

Vin: 5 mVPP

285 mVPPThe minimum sensitivity is tested with a 2.5 mVPP single-ended input at 85°C, 25°C and-40°C, respectively. The bit error rate (BER) is measured less than 10-12 with 10-Gb/s 2311 pseudo-random bit sequences.
AT 85 °C

Rev. 8B4_C, 11/14/08

6

EuvisDifferential Limiting Amplifier, LA302Z

At 25°C

At –40 oC

Rev. 8B4_C, 11/14/08

7

EuvisDifferential Limiting Amplifier, LA302Z

Euvis
Ordering Information:
Email to: Sales@euvis.com
Or call: (805) 583-9888 x108 Sales Department
Or fax: (805) 583-9889
The information contained in this document is based on product test results. Characteristic data and otherspecifications are subject to change without notice. Customers are advised to confirm information in thisadvanced datasheet prior to using this information or placing the order.
Euvis Inc. does not assume any liability arising from the application or use of any product or circuitdescribed herein, neither does it convey any license under its patents or any other rights.

Rev. 8B4_C, 11/14/08

8