200Mbps SFP Limiting Amplifier

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The MAX3969 limiting amplifier with PECL data outputs is ideal for low-cost ATM, Fast Ethernet, FDDI and ESCON fiber optic receivers.

The MAX3969 features 1mVP-P input sensitivity and an integrated power detector that senses the input signal power. It provides a received-signal-strength indicator (RSSI), which is an analog indication of the power level. Signal strength is also indicated by the complementary TTL loss-of-signal (LOS) outputs and the PECL signal-detect (SD) output, both of which indicate the power level relative to a programmable threshold.

The threshold can be adjusted to detect signal amplitudes as low as 2.7mVP-P. An optional squelch function disables switching of the data outputs by holding them at a known state when the signal is below the programmed threshold.

The MAX3969 is available in die form and a 4mm x 4mm, 20-pin thin QFN package.
MAX3969: Functional Diagram MAX3969: Functional Diagram Enlarge+

Key Features

  • 1mVP-P Input Sensitivity
  • Loss-of-Signal Detector with Programmable Threshold
  • TTL LOS and PECL Signal Detect
  • Analog Received-Signal-Strength Indicator
  • Output Squelch Function
  • Compatible with 4B/5B Data Coding


  • 155Mbps LAN ATM Transceivers
  • ESCON Receivers
  • Fast Ethernet/FDDI Transceivers
  • FTTx Transceivers
  • SFF/SFP Transceivers

See parametric specs for Limiting Amplifiers (10)

Part NumberTarget Oper. Range
Data Rate
I/O TypeInput Sens.
LOS Sens.
Edge Speed
maxtypminmaxSee Notes
MAX3969 <12003.322PECL12.7800
$2.37 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX3969ETPEVKIT: Evaluation Kit for the MAX3969
Product Reliability Reports: MAX3969.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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