1 Features
• Wide bandwidth:
– Gain-bandwidth product: 250 MHz
– Bandwidth (G = 1 V/V): 600 MHz
– Large-signal bandwidth (2 VPP): 200 MHz
– Slew rate: 750 V/μs
• High precision:
– Input offset voltage: 250 μV (maximum)
– Input offset voltage drift: 3.5 μV/°C (maximum)
• Input voltage noise: 5.3 nV/√Hz
• Input bias current: 2 pA
• Low distortion (RL = 100 Ω, VO = 2 VPP):
– HD2, HD3 at 10 MHz: –75 dBc, –85 dBc
• Supply range: 6 V to 12.6 V
• Supply current: 16 mA
• Performance upgrade to OPA656

2 Applications
• High-speed data acquisition (DAQ)
• Active probes
• Oscilloscopes
• Optical communication modules
• Test and measurement front-ends
• Medical and chemical analyzers
• Optical time-domain reflectometry (OTDR)

3 Description
The OPA814 is a unity-gain stable, voltage-feedback
operational amplifier for high-speed, high-precision,
and wide-dynamic-range applications.
The OPA814 has a low-noise junction gate field-effect
transistor (JFET) input stage that features a wide gain
bandwidth of 250 MHz and a supply range from 6 V to
12.6 V. The fast slew rate of 750 V/μs allows a wide
large-signal bandwidth and low distortion when used
as high impedance buffer in high-speed digitizers,
active probes, and other test and measurement
applications.
The OPA814 offers extremely low input offset
voltage of ±250 μV and offset voltage drift of
±3.5-μV/°C. The combination of picoamperes of
input bias current and low input voltage noise
(5.3 nV/√Hz) makes the OPA814 an excellent
wideband transimpedance amplifier in optical test and
communication equipment, as well as medical and
scientific instrumentation.
The OPA814 is available in an 8-pin SOIC package.
This device is specified to operate over the industrial
temperature range of –40°C to +85°C.