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2.5 Gb/s Transimpedance Amplifier LP
Final
Applications
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SONET/SDH-based transmission systems, test
equipment and modules
OC-48 fibre optic modules and line termination
ATM over SONET/SDH
Gigabit Ethernet
Fibre Channel
Product Description
SiGe Semiconductor offers a portfolio of optical
networking ICs for use in high-performance optical
transmitter and receiver functions, from 155 Mb/s up
to 12.5 Gb/s.
SiGe Semiconductor鈥檚 SE1031 is a fully integrated,
silicon bipolar transimpedance amplifier; providing
wideband, low noise preamplification of signal current
from a photodetector. It features differential outputs,
and incorporates an automatic gain control
mechanism to increase dynamic range, allowing input
signals up to 2.6 mA peak. A decoupling capacitor on
the supply is the only external circuitry required. A
system block diagram is shown after the functional
description, on page 3.
Noise performance is optimized for 2.5 Gb/s
operation, with a calculated rms noise based
-10
sensitivity of 鈥?6 dBm for 10 bit error rate, achieved
using a detector with 0.5 pF capacitance and a
responsivity of 0.9 A/W, with an infinite extinction ratio
source.
Features
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Single +3.3 V power supply
Power dissipation = 110 mW (typ)
Input nois e current = 360 nA rms when used with
a 0.5 pF detector
Transimpedance gain = 2.3 k鈩?into a 50
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load
(differential)
On-chip automatic gain control gives input
current overload of 2.6 mA pk and max output
voltage swing of 300 mV pk-pk
Differential 50
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outputs
Bandwidth (-3 dB) = 2.4 GHz
Wide data rate range = 50 Mb/s to 2.5 Gb/s
Constant photodiode reverse bias voltage = 1.5 V
(anode to input, cathode to VCC)
Minimal external components, supply decoupling
only
Operating junction temperature range = -40擄C to
+125擄C
Equivalent to Nortel Networks AB89-A4A
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Ordering Information
Type
SE1031W
Package
Bare Die
Remark
None
Functional Block Diagram
SE1031
TzAmp
2.5 Gb/s
Automatic Gain Control
Integrator
VCC or + supply
ve
Rectifier
Input
Current
TZ_IN
Rf
Tz Amp
Output
Driver
50
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50
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OUTP
OUTN
Bandgap
Reference
54-DST-01
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Rev 1.3
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Apr 11/02
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