Low-Power, 622Mbps Limiting Amplifiers with Chatter-Free Power Detect for LANs

Generates Only 15ps PWD and Has 4mV Input Sensitivity

Please check latest availability status for a specific part variant.


The MAX3761/MAX3762 limiting amplifiers, with 4mV sensitivity and PECL data outputs, are optimized for operation in low-cost, 622Mbps, LAN/ATM LAN fiber optics applications.

An integrated power detector senses the input signal's amplitude. A received-signal-strength indicator (RSSI) gives an analog indication of the power level, while the complementary loss-of-signal (LOS) outputs indicate if the input power level exceeds the programmed threshold level. The LOS threshold can be adjusted to detect signal amplitudes between 3mVP-P and 100mVP-P, providing a 15dB LOS adjustment in fiber optic receivers. The LOS outputs have 3.5dB of hysteresis, which prevents chatter when input signal levels are small. The MAX3761's LOS outputs are compatible with TTL-logic levels. The MAX3762 has PECL LOS outputs.

DISABLE and LOS can be used to implement a squelch function, which turns off the data outputs when the input signal is below the programmed threshold.
MAX3761, MAX3762: Typical Operating Circuit MAX3761, MAX3762: Typical Operating Circuit Enlarge+

Key Features

  • Chatter-Free Power Detector with Programmable Loss-of-Signal Outputs
  • 4mV Input Sensitivity
  • PECL Data Outputs
  • Single 5V Power Supply
  • 250ps Output Edge Speed
  • Low 15ps Pulse-Width Distortion
  • TTL Loss-of-Signal Interface Logic—MAX3761
  • PECL Loss-of-Signal Interface Logic—MAX3762


  • 155Mbps LAN/ATM LAN Receivers
  • 622Mbps LAN/ATM LAN Receivers

See parametric specs for Limiting Amplifiers (10)

Part NumberTarget Oper. Range
Data Rate
Data Rate
I/O TypeInput Sens.
LOS Sens.
Edge Speed
minmaxtypminmaxSee Notes
MAX3761 <1155622525PECL43.2250
$4.66 @1k
MAX3762 30

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.

MAX3761EVKIT: Evaluation Kit for the MAX3761
MAX3762EVKIT: Evaluation Kit for the MAX3762
Product Reliability Reports: MAX3761.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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