OPA857_15 Datasheet, PDF (1/30 Pages) Texas Instruments – OPA857 Ultralow-Noise, Wideband, Selectable-Feedback Resistance Transimpedance Amplifier

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OPA857
SBOS630C – DECEMBER 2013 – REVISED APRIL 2014
OPA857 Ultralow-Noise, Wideband, Selectable-Feedback Resistance
Transimpedance Amplifier
1 Features
•1 Internal Midreference 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
2 Applications
• Photodiode Monitoring
• Precision I/V Conversion
• Optical Amplifiers
• CAT-Scanner Front-Ends
3 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 modern
transimpedance amplifier applications. The OPA857
is available in a 3-mm × 3-mm VQFN package.
The device is characterized for operation over the full
industrial temperature range from –40°C to +85°C.
Device Information⁽¹⁾
DEVICE NAME
PACKAGE
BODY SIZE
OPA857
VQFN (16)
3 mm × 3 mm
(1) For all available packages, see the package option addendum
at the end of the datasheet.
CTRL
+V_S
GND
TIA
R_F2
R_F1
IN
Test_SD
TEST
1:1
Test_IN
2 kW
CLAMP
Clamping
Circuit
25 W
OUT
25 W
OUTN
REF
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.