+3.0V to +5.5V, 125Mbps to 266Mbps Limiting Amplifiers with Loss-of-Signal Detector

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The MAX3969 is a recommended upgrade for the MAX3964 and MAX3968. The MAX3964A limiting amplifier, with 2mVP-P input sensitivity and PECL data outputs, is ideal for low-cost ATM, FDDI, and Fast Ethernet fiber optic applications.

The MAX3964A features 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 and complementary PECL loss-of-signal (LOS) outputs, which indicate when the power level drops below 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 during an LOS condition.

The MAX3968 provides the same functionality as the MAX3964A, but has data-output edge speed suitable for ESCON and 266Mbps fibre channel applications.

The MAX3964A/MAX3968 are available in die form, as tested wafers, and in 20-pin QSOP packages. The MAX3964AETP is available in a 20-pin thin QFN package.
MAX3964, MAX3965, MAX3968: Typical Operating Circuit MAX3964, MAX3965, MAX3968: Typical Operating Circuit Enlarge+

Key Features

  • Single Supply: +3.0V to +5.5V
  • 2mVP-P Input Sensitivity
  • 1.2ns Output Edge Speed
  • Loss-of-Signal Detector with Programmable Threshold
  • Analog Received-Signal-Strength Indicator
  • Output Squelch Function
  • Compatible with 4B/5B Data Coding


  • 125Mbps FDDI Receivers
  • 155Mbps FTTx Receivers
  • 155Mbps LAN ATM Receivers
  • ESCON Receivers
  • Fast Ethernet Receivers

Quality and Environmental Data

Request Reliability Report for: MAX3965 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

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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