OPA121| Datasheet

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OPA121

Low Cost Precision Difet OPERATIONAL AMPLIFIER
FEATURES
q LOW NOISE: 6nV/Hz typ at 10kHz q LOW BIAS CURRENT: 5pA max q LOW OFFSET: 2mV max q LOW DRIFT: 3uV/ C typ q HIGH OPEN-LOOP GAIN: 110dB min q HIGH COMMON-MODE REJECTION: 86dB min

APPLICATIONS
q OPTOELECTRONICS q DATA ACQUISITION q TEST EQUIPMENT q MEDICAL EQUIPMENT q RADIATION HARD EQUIPMENT

DESCRIPTION
The OPA121 is a precision monolithic dielectricallyisolated FET (Difet ) operational amplifier. Outstanding performance characteristics are now available for low-cost applications. Noise, bias current, voltage offset, drift, open-loop gain, common-mode rejection, and power supply rejection are superior to BIFET amplifiers. Very low bias current is obtained by dielectric isolation with on-chip guarding. Laser-trimming of thin-film resistors gives very low offset and drift. Extremely low noise is achieved with new circuit design techniques (patented). A new cascode design allows high precision input specifications and reduced susceptibility to flicker noise. Standard 741 pin configuration allows upgrading of existing designs to higher performance levels.

Case (TO-99) and Substrate 8 7 +VCC

In 2 3 +In Noise-Free Cascode* 6 Output Trim 10k 1 5 Trim 10k 2k 2k

2k 4

*Patented OPA121 Simplified Circuit

VCC

Difet , Burr-Brown Corp. BIFET , National Semiconductor Corp.

International Airport Industrial Park Mailing Address: PO Box 11400 Tel: (520) 746-1111 Twx: 910-952-1111 Cable: BBRCORP 1984 Burr-Brown Corporation

Tucson, AZ 85734 Street Address: 6730 S. Tucson Blvd. Tucson, AZ 85706 Telex: 066-6491 FAX: (520) 889-1510 Immediate Product Info: (800) 548-6132 PDS-539F Printed in U.S.A. September, 1993

SBOS139