TGA4957-SM
28 Gb/s Differential Modulator Driver
Applications
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40 Gb/s Optical Market: DQPSK and DP-BPSK
100 Gb/s ODB
QFN 6x6mm 40L
Product Features
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40 Gb/s Performance
Differential Input and Output
Adjustable Output Amplitude, 4 Vpp – 8 Vpp
Low Additive RMS Jitter, 600 fsec
High Output Drive, 8 Vpp differential output with 1
Vpp differential Input
Gain, 22 dB at 14 GHz
Low DC Power Dissipation, 2.3 W for Vout = 8 Vpp at
Vd=5 V
Rise and Fall Times, 13 psec
QFN Package Size: 6x6 mm, 40 Lead
Typical Eye Diagram
Bias: Vd1 = Vd2 = Vd3 = 5 V, Vg2 = -0.4 V (-0.6 V for 4 Vpp), Vg3
= -1.1 V, Vc3 varied for different eye amplitude values
28 Gbps
General Description
The TriQuint TGA4957-SM is a differential input and
output optical modulator driver designed to operate at
frequencies that target the 40 Gb/s and 100 Gb/s optical
markets.
The TGA4957-SM consists of a wideband amplifier
assembled in a QFN surface mount package combined
with a minimum of external components. A single
TGA4957-SM placed between the MUX and Optical
Modulator provides OEMs with a differential modulator
driver surface mount solution.
The TGA4957-SM provides Metro and Long Haul
designers with system critical features such as: low
power dissipation, low rail ripple, high voltage drive
capability (4 Vpp amplitude adjustable up to 8 Vpp), and
very low output jitter.
Several of the bias pins on the TGA4957-SM are
internally set to simplify the users PCB design.
Alternatively, these same pins can be adjusted by the
user, if desired. Duplicate pins are available to enable
biasing from either side of the package. The TGA4957-
SM can be biased using a minimum of four separate
power supplies.
The TGA4957-SM is RoHS compliant. Evaluation boards
are available upon request.
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Typical S-Parameters
Gain and Return Loss vs Frequency
Vd = 5 V, Id = 468 mA, Vg2 = -0.4 V, Vg3 = -1.1 V, Vc3 = 0 V
Differential Measurement
25
20
Gain
IRL
ORL
50
40
30
20
10
0
0
10
20
30
40
50
Frequency (GHz)
15
10
5
0
Ordering Information
Part No.
TGA4957-SM
ECCN
5A991.b
Description
28
Gb/s Diff Mod Driver
Product Summary Sheet: Rev - 5/6/13
© 2013 TriQuint, Inc.
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1 of 1-
Disclaimer: Subject to change without notice
www.triquint.com
Return Loss (dB)
Gain (dB)
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