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.