OPA842

SBOS267A – NOVEMBER 2002 – REVISED DECEMBER 2002

www.ti.com

DESCRIPTION

The OPA842 provides a level of speed and dynamic range

previously unattainable in a monolithic op amp. Using unity-

gain stable, voltage-feedback architecture with two internal

gain stages, the OPA842 achieves exceptionally low har-

monic distortion over a wide frequency range. The “classic”

differential input provides all the familiar benefits of precision

op amps, such as bias current cancellation and very low

inverting current noise compared with wideband current

differential gain/phase performance, low-voltage noise, and

high output current drive make the OPA842 ideal for most

high dynamic range applications.

Unity-gain stability makes the OPA842 particularly suitable

for low-gain differential amplifiers, transimpedance amplifi-

ers, gain of +2 video line drivers, wideband integrators, and

low-distortion Analog-to-Digital Converter (ADC) buffers.

Where higher gain or even lower harmonic distortion is

required, consider the OPA843—a higher-gain bandwidth

and lower-noise version of the OPA842.

FEATURES

q UNITY-GAIN BANDWIDTH: 400MHz

q GAIN-BANDWIDTH PRODUCT: 200MHz

q LOW INPUT VOLTAGE NOISE: 2.6nV/

√Hz

q VERY LOW DISTORTION: –93dBc (5MHz)

q HIGH OPEN-LOOP GAIN: 110dB

q FAST 12-BIT SETTLING: 22ns (0.01%)

q LOW DC VOLTAGE OFFSET: 300

q PROFESSIONAL LEVEL DIFF GAIN/PHASE ERROR:

0.003%/0.008

°

Copyright © 2002, Texas Instruments Incorporated

Wideband, Low Distortion, Unity-Gain Stable,

Voltage-Feedback OPERATIONAL AMPLIFIER

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

APPLICATIONS

q ADC/DAC BUFFER DRIVER

q LOW DISTORTION “IF” AMPLIFIER

q ACTIVE FILTER CONFIGURATION

q LOW-NOISE DIFFERENTIAL RECEIVER

q HIGH-RESOLUTION IMAGING

q TEST INSTRUMENTATION

q PROFESSIONAL AUDIO

q OPA642 UPGRADE

INPUT NOISE

GAIN-BANDWIDTH

SINGLES

VOLTAGE (nV/√Hz )

PRODUCT (MHz)

OPA843

2.0

800

OPA846

1.1

2500

OPA847

0.8

3700

OPA842 RELATED PRODUCTS

OPA842

V

IN

402

Ω

402

Ω

ADS850

14-Bit

10MSPS

R

S

24.9

Ω

2k

Ω

2k

Ω

2k

Ω

2k

Ω

0.1

µF

0.1

µF

IN

IN

(+2V)

REFB

(+1V)

VREF

SEL

REFT

(+3V)

100pF

+5V

–5V

50

Ω

+5V

OPA842

AC-Coupled to 14-Bit ADS850 Interface

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.