1 Features
1• Internal Midscale Reference Voltage
• Pseudo-Differential Output Voltage
• Wide Dynamic Range
• Closed-Loop Transimpedance Bandwidth:
– 125 MHz (5-kΩ Transimpedance Gain, 1.5-pF
External Parasitic Capacitance)
– 105 MHz (20-kΩ Transimpedance Gain, 1.5-pF
External Parasitic Capacitance)
• Ultralow Input-Referred Current Noise (Brickwall
Filter BW = 135 MHz):
– 15 nARMS (20-kΩ Transimpedance)
• Very Fast Overload Recovery Time: < 25 ns
• Internal Input Protection Diode
• Power Supply:
– Voltage: 2.7 V to 3.6 V
– Current: 23.4 mA
• Extended Temperature Range: –40°C to +85°C

2 Applications
• Photodiode Monitoring
• High-Speed I/V Conversions
• Optical Amplifiers
• CAT-Scanner Front-Ends

3 Description
The OPA857-DIE is a wideband, fast overdrive
recovery, fast-settling, ultralow-noise transimpedance
amplifier targeted at photodiode monitoring
applications. With selectable feedback resistance, the
OPA857-DIE simplifies the design of highperformance
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 modern transimpedance amplifier
applications.
The device is characterized for operation over the full
industrial temperature range from –40°C to +85°C.