FET-Input Operational Amplifier - Texas Instruments
Description
OPA656
SBOS196I – DECEMBER 2001 – REVISED FEBRUARY 2024
OPA656 550MHz, Unity-Gain Stable, FET-Input Operational Amplifier
1 Features
• Wide bandwidth:
– Gain-bandwidth product: 230MHz – Unity-gain bandwidth: 550MHz – Large-signal bandwidth (2VPP): 150MHz • High precision:
– Input offset voltage: 600μV (maximum) – Input offset voltage drift: 6μV/°C (maximum) • Input voltage noise: 6nV/√Hz • Input bias current: 2pA • Low distortion (RL = 200Ω, VO = 2VPP): – HD2, HD3 at 5MHz: –80dBc, –100dBc • Supply range: 8V to 12V
2 Applications
• High-speed data acquisition (DAQ) • Medical and chemical analyzers • Active probes • Oscilloscopes • Optical communication modules • Test and measurement front-ends • Optical time-domain reflectometry (OTDR)
VBIAS
VREF
CPD (20 pF)
5V
+ OPA656 VO
–
–5 V
100 k¡
3 Description
The OPA656 combines a wideband, unity-gain stable, voltage-feedback operational amplifier with a lownoise junction gate field-effect transistor (JFET) input stage to offer an ultra high dynamic-range amplifier for transimpedance applications and high-speed data acquisition front-ends.
Extremely low dc errors give good precision in both optical applications and test and measurement.
The OPA656 features ultra-low input voltage noise (6nV/√Hz) to achieve a very low integrated noise in transimpedance applications.
The combination of high input impedance and low input voltage noise makes the OPA656 an excellent wideband transimpedance amplifier in optical test and communication equipment, as well as medical and scientific instrumentation.
The OPA656 features a wide gain bandwidth of 230MHz.
The large-signal bandwidth of 150MHz and low distortion make the OPA656 an excellent choice in high-speed digitizer front-ends, active probes, and other test and measurement front ends.
The OPA656 is specified to operate over the industrial temperature range of –40°C to +85°C.
Package Information
PART NUMBER
PACKAGE(1)
PACKAGE SIZE(2)
OPA656
D (SOIC, 8) DBV (SOT-23, 5)
4.
9m...
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