®

OPA124

1

FEATURES

q LOW NOISE: 6nV/

q LOW BIAS CURRENT: 1pA max

q LOW OFFSET: 250

q LOW DRIFT: 2

q HIGH OPEN-LOOP GAIN: 120dB min

q HIGH COMMON-MODE REJECTION:

100dB min

q AVAILABLE IN 8-PIN PLASTIC DIP

AND 8-PIN SOIC PACKAGES

APPLICATIONS

q PRECISION PHOTODIODE PREAMP

q MEDICAL EQUIPMENT

q OPTOELECTRONICS

q DATA ACQUISITION

q TEST EQUIPMENT

OPA124

DESCRIPTION

The OPA124 is a precision monolithic FET opera-

tional amplifier using a Difet (dielectrical isolation)

manufacturing process. Outstanding DC and AC per-

formance characteristics allow its use in the most

critical instrumentation applications.

Bias current, noise, voltage offset, drift, open-loop

gain, common-mode rejection and power supply re-

jection are superior to BIFET and CMOS amplifiers.

Difet fabrication achieves extremely low input bias

currents without compromising input voltage noise

performance. Low input bias current is maintained

over a wide input common-mode voltage range with

unique cascode circuitry. This cascode design also

allows high precision input specifications and reduced

susceptibility to flicker noise. Laser trimming of thin-

film resistors gives very low offset and drift.

Compared to the popular OPA111, the OPA124 gives

comparable performance and is available in an 8-pin

PDIP and 8-pin SOIC package.

®

Low Noise Precision

OPERATIONAL AMPLIFIER

8

2

3

1

5

7

6

4

Substrate

Output

+V

CC

+In

–In

–V

CC

2k

Ω

2k

Ω

2k

Ω

10k

Ω

10k

Ω

NOTES: (1) Omitted on SOIC. (2) Patented.

2k

Ω

OPA124 Simplified Circuit

International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111

Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132

© 1993 Burr-Brown Corporation

PDS-1203C

Printed in U.S.A. March, 1998

OPA124