OPA857 Datasheet, PDF (1/29 Pages) Texas Instruments – Ultralow-Noise, Wideband, Selectable Feedback Resistance Transimpedance Amplifier

OPA857
www.ti.com
SBOS630B – DECEMBER 2013 – REVISED JANUARY 2014
Ultralow-Noise, Wideband, Selectable Feedback Resistance
Transimpedance Amplifier
Check for Samples: OPA857
FEATURES
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•2 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)
• Ultralow Voltage Noise Density:
14.7 nA_RMS (NPBW = 85.7 MHz)
• Very Fast Overload Recovery Time: < 15 ns
• Internal Input Protection Diode
• Power Supply:
– Voltage: +2.6 V to +3.6 V
– Current: 23.4 mA
• Extended Temperature Range: –40°C to +85°C
APPLICATIONS
• Photodiode Monitoring
• Precision I/V Conversion
• Optical Amplifiers
• CAT-Scanner Front-Ends
DESCRIPTION
The OPA857 is a wideband, fast overdrive recovery,
fast-settling, ultralow-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-mm x 3-mm QFN package.
The device is characterized for operation over the full
industrial temperature range from –40°C to +85°C.
CTRL
+V_S
GND
R_F2
IN
Test_SD
Test_IN
R_F1
Text
25 W
OUT
25 W _OUTN
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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