DESCRIPTION

The OPA843 provides a level of speed and dynamic range

previously unattainable in a monolithic op amp. Using a high

Gain Bandwidth (GBW), two gain-stage design, the OPA843

gives a medium gain range device with exceptional dynamic

range. The “classic” differential input complements this high

dynamic range with DC precision beyond most high-speed

amplifier products. Very low input offset voltage and current,

high Common-Mode Rejection Ratio (CMRR) and Power-

Supply Rejection Ratio (PSRR), and high open-loop gain

combine to give a high DC precision amplifier along with low

noise and high 3rd-order intercept.

12- to 16-bit converter interfaces will benefit from this combi-

nation of features. High-speed transimpedance applications

can be implemented with exceptional DC precision as well.

Differential configurations using two OPA843s can deliver

very low distortion to high output voltages, as shown below.

FEATURES

q HIGH BANDWIDTH: 260MHz (G = +5)

q GAIN BANDWIDTH PRODUCT: 800MHz

q LOW INPUT VOLTAGE NOISE: 2.0nV/

√Hz

q VERY LOW DISTORTION: –96dBc (5MHz)

q HIGH OPEN-LOOP GAIN: 110dB

q FAST 12-BIT SETTLING: 10.5ns (0.01%)

q LOW INPUT OFFSET VOLTAGE: 300

q OUTPUT CURRENT:

APPLICATIONS

q ADC/DAC BUFFER AMPLIFIER

q LOW DISTORTION “IF” AMPLIFIER

q ACTIVE FILTERS

q LOW-NOISE RECEIVER

q WIDEBAND TRANSIMPEDANCE

q TEST INSTRUMENTATION

q PROFESSIONAL AUDIO

q OPA643 UPGRADE

OPA843

SBOS268A – DECEMBER 2002 – OCTOBER 2003

www.ti.com

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.

Copyright © 2002-2003, Texas Instruments Incorporated

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.

All trademarks are the property of their respective owners.

Wideband, Low Distortion, Medium Gain,

Voltage-Feedback OPERATIONAL AMPLIFIER

INPUT NOISE

GAIN-BANDWIDTH

SINGLES

PRODUCT (MHz)

OPA842

2.6

200

OPA846

1.2

1750

OPA847

0.85

3900

OPA843 RELATED PRODUCTS

OPA8

43

V

V

I

1:1

50

Ω

132

Ω

OPA843

OPA843

+5V

+5V

–5V

–5V

Very Low Distortion Differential Driver

R

L

400

Ω

402

Ω

40.2

Ω

40.2

Ω

402

Ω

DIFFERENTIAL DISTORTION vs OUTPUT VOLTAGE

Output Voltage Swing (Vp-p)

10

1

–85

–90

–95

–100

–105

–110

G

R

F = 5MHz

2nd-Harmonic

3rd-Harmonic