10Gbps, 3.3V Low-Power Transimpedance Amplifier with RSSI

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The MAX3970 is a compact, low-power transimpedance amplifier (TIA) optimized for use in 10Gbps optical receivers. The TIA provides transimpedance at 600V/A with 50Ω differential CML outputs. The MAX3970 has a typical input-referred noise of 1.1µA, and when coupled with a high-speed photodiode, achieves -18dBm sensitivity and +2mA input overload. A received-signal strength indicator (RSSI) simplifies optical assembly. The circuit operates from a single 3.3V supply over a junction temperature range from 0°C to +110°C.

Data Sheet

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Key Features

  • 150mW Power Dissipation at 3.3V Supply
  • 1.1µARMS Noise (-18dBm Sensitivity)
  • 9GHz Bandwidth
  • 2mAP-P Input Overload
  • Received-Signal Strength Indication
  • 8psP-P Typical Jitter Generation at 1.3mAP-P Input Current
  • 600V/A Transimpedance


  • 10.3Gbps Ethernet Optical Receivers
  • Fibre Channel Optical Receivers
  • OC-192 VSR Optical Receivers


MAX3970: Typical Application Circuit
Typical Application Circuit

More Information

New Product Press Release   2001-08-15 ]

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Document Ref.: 19-1970 Rev 2; 2002-08-08
This page last modified: 2007-06-15