OPA857 Transimpedance Amplifier

OPA857 Transimpedance Amplifier

Texas Instruments' OPA857 is a wideband, fast overdrive recovery, fast-settling, ultra-low-noise transimpedance amplifier targeted at photodiode monitoring applications. With selectable feedback resistance, the OPA857 simplifies the design of high-performance optical systems. Very fast overload recovery time and internal input protection provide the best combination to protect the remainder of the signal chain from overdrive while minimizing recovery time. The two selectable transimpedance gain configurations allow high dynamic range and flexibility required in today's transimpedance amplifier applications. The OPA857 is available in a 3 × 3 mm QFN package, and is characterized for operation over the full industrial temperature range from –40°C to +85°C.

Features
  • Internal mid-reference voltage
  • Pseudo-differential output
  • Wide dynamic range
  • Bandwidth:
    • 115 MHz (4.5 kΩ transimpedance, 1.5 pF external parasitic capacitance)
    • 130 MHz (18.2 kΩ transimpedance, 1.5 pF external parasitic capacitance)
Applications
  • Photodiode monitoring
  • Precision I/V conversion
  • Optical amplifiers
  • CAT-scanner front-ends

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