02139-DSH-001-D

Mindspeed Technologies

®

August 2011

Mindspeed Proprietary and Confidential

M02139

1G/10G Gbps TIA with AGC and Rate Select

Applications

• Fibre Channel Transceivers (2x, 4x, 8x, 10x)

• 10GBASE-SR, IR and LR Links

• SONET/SDH OC-192/STM-64

• 10 Gbps ROSA

• SFP/SFP+ Modules

• 10GBASE/1GBase Dual Rate Modules

• XFP, XENPAK, X2 and 300-pin MSA transponder modules

The M02139 is a multi-rate TIA supporting data rates from 1 Gbps to 10.3 Gbps and having a wide input dynamic

better than -19 dBm are useful for single-mode, high power long haul links, as well as short haul multi-mode links.

In order to satisfy such high sensitivity and good optical overload requirements, automatic gain control (AGC) is

implemented in the M02139. The AGC monitors the output amplitude and automatically reduces the TIA gain when

the photodiode current exceeds the AGC threshold, maintaining the output at a constant level.

Requiring no extra pins on the ROSA, rate select is controlled by the DC potential on the mon pad. Low rate is

optimized for 1G/1.25 Gbps performance with a typical sensitivity lower than -22 dBm. A replica of the average

photodiode current is available at the MON pad for photo-alignment and SFF-8472 Rx power monitoring.

Typical Applications Diagram

PINA

DOUT

DOUTB

PINK

1 nF

Monitor Output /Rate Select

Rm

Typically

AC-Coupled

to Limiting

Amplifier

Limiting

Amplifier

M02139

Features

• Typical -19 dBm average sensitivity @ 10.3 Gbps

• Low rate mode for 1G/1.25 Gbps operation

• No filter (PINK) capacitor required

• AGC provides dynamic range of 23 dB

•3.8 k

Ω differential transimpedance

• Photodiode current monitor

• Internal or external bias for photodiode

• Single +3.3 V supply

• Available in die form only