OPA814 600-MHz, High-Precision, Unity-Gain Stable, FET-Input Operational Amplifier

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.

Package Information(1)(2)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

OPA814

D (SOIC, 8)

4.90 mm × 3.91 mm

DBV (SOT-23, 5)(3)

2.90 mm × 1.60 mm

(1)

For all available packages, see the package option

addendum at the end of the data sheet.

(2)

See the Device Comparison Table.

(3)

Preview package (not Production Data).

VREF

+

–

ADC

RG1

RG2

RF1

RF2

+

–

VCM

+5 V

5 V

OPA814

Input

THS4541

ADS4149

High-Input-Impedance Digitizer Front-End

Frequency (Hz)

-15

-12

-9

-6

-3

0

3

100k

1M

10M

100M

1G

G = 1 V/V, VOUT = 2 VPP

Large-Signal Frequency Response

OPA814

SBOSA14 – APRIL 2023

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. UNLESS OTHERWISE NOTED, this document contains PRODUCTION

DATA.