Datasheet OPA128 (Texas Instruments)

®
OPA128 Difet® Electrometer-Grade OPERATIONAL AMPLIFIER FEATURES APPLICATIONS
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ULTRA-LOW BIAS CURRENT: 75fA max
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ELECTROMETER
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LOW OFFSET: 500
µ
V max
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MASS SPECTROMETER
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LOW DRIFT: 5
µ
V/
°
C max
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CHROMATOGRAPH
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HIGH OPEN-LOOP GAIN: 110dB min
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ION GAUGE
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HIGH COMMON-MODE REJECTION:
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PHOTODETECTOR 90dB min
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RADIATION-HARD EQUIPMENT
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IMPROVED REPLACEMENT FOR AD515 AND AD549 DESCRIPTION
Case (Guard) The OPA128 is an ultra-low bias current monolithic 8 7 operational amplifier. Using advanced geometry +VCC dielectrically-isolated FET (
Difet®
) inputs, this mono- lithic amplifier achieves a performance level exceed- ing even the best hybrid electrometer amplifiers. –In Laser-trimmed thin-film resistors give outstanding volt- 2 age offset and drift performance. 3 A noise-free cascode and low-noise processing give Noise-Free +In the OPA128 excellent low-level signal handling capa- Cascode bilities. Flicker noise is very low. 6 Output The OPA128 is an improved pin-for-pin replacement for the AD515. 28kΩ Trim 28kΩ 1kΩ 1
Difet®
Burr-Brown Corp. 5 1kΩ Trim 2kΩ 2kΩ 4 –VCC
OPA128 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
©1986 Burr-Brown Corporation PDS-653E Printed in U.S.A. May, 1995
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