SE1031W

LightCharger

Final

54-DST-01

§ Rev 1.3 § Apr 11/02

1 of 7

Applications

§

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

Features

§

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

Ω into a 50 Ω 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

Ω 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

°C to

+125

°C

§

Equivalent to Nortel Networks AB89-A4A

Ordering Information

Type

Package

Remark

SE1031W

Bare Die

None

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’s 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

sensitivity of –26 dBm for 10

-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.

Functional Block Diagram

VCC or +ve supply

SE1031

TzAmp

2.5 Gb/s

Tz Amp

Output

Driver

Bandgap

Reference

Integrator

Rectifier

Automatic Gain Control

TZ_IN

Input

Current

OUTP

OUTN

50

Ω

50

Ω

Rf