MAX3665

NOT RECOMMENDED FOR NEW DESIGNS

622Mbps, Ultra-Low-Power, 3.3V Transimpedance Preamplifier for SDH/SONET

Data Sheet (Rev. 2) Product Selection Table
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Overview

  • +3.3V or +5.0V Single-Supply Operation
  • 55nARMS Input-Referred Noise
  • 70mW Power Consumption at VCC = 3.3V
  • 8kΩ Gain
  • 450µA Peak Input Current
  • 260ps (max) Deterministic Jitter
  • Differential Output Drives 100ΩLoad
  • 470MHz Bandwidth

The MAX3665 low-power transimpedance preamplifier for 622Mbps SDH/SONET applications consumes only 70mW at VCC = 3.3V. Operating from a single +3.3V or +5.0V supply, it converts a small photodiode current to a measurable differential voltage. A DC cancellation circuit provides a true differential output swing over a wide range of input current levels, thus reducing pulse-width distortion. The differential outputs are back-terminated with 50Ω per side.

The overall transimpedance gain is nominally 8kΩ. For input signal levels beyond approximately 50µAp-p, the amplifier will limit the output swing to 250mV. The MAX3665's low 55nA input noise provides a typical sensitivity of -33.2dBm in 1300nm, 622Mbps receivers.

The MAX3665 is designed to be used in conjunction with the MAX3676 clock recovery and data retiming IC with limiting amplifier. Together they form a complete 3.3V or 5.0V 622Mbps SDH/SONET receiver.

In die form, the MAX3665 is designed to fit on a header with a PIN diode. It includes a filter connection that provides positive bias for the photodiode through a 1.5kΩ resistor to VCC. The device is available in an 8-pin µMAX® package.

Applications

  • PIN Photodiode Preamplifiers and Receivers
  • Regenerators for SDH/SONET
  • SDH/SONET Receivers
MAX3665
622Mbps, Ultra-Low-Power, 3.3V Transimpedance Preamplifier for SDH/SONET
MAX3665: Typical Application Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 3

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Clock & Data Recovery 1
MAX3676
NOT RECOMMENDED FOR NEW DESIGNS 622Mbps, 3.3V Clock-Recovery and Data-Retiming IC with Limiting Amplifier
Serializer/Deserializer (SerDes) & Gigabit Multimedia Serial Link (GMSL) 2
MAX3680
+3.3V, 622Mbps, SDH/SONET 1:8 Deserializer with TTL Outputs
MAX3681
+3.3V, 622Mbps, SDH/SONET 1:4 Deserializer with LVDS Outputs
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