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OPA129UB
OPA129 OPA OPA 129 129 SBOS026A – JANUARY 1994 – REVISED APRIL 2007 Ultra-Low Bias Current Difet® OPERATIONAL AMPLIFIER FEATURES APPLICATIONS q q q q q q q q q q q q ULTRA-LOW BIAS CURRENT: 100fA max LOW OFFSET: 2mV max LOW DRIFT: 10µV/°C max HIGH OPEN-LOOP GAIN: 94dB min LOW NOISE: 15nV/√Hz at 10kHz PLASTIC DIP AND SO PACKAGES PHOTODETECTOR PREAMPS CHROMATOGRAPHY ELECTROMETER AMPLIFIERS MASS SPECTROMETERS pH PROBE AMPLIFIERS ION GAGE MEASUREMENT Substrate DESCRIPTION 8 The OPA129 is an ultra-low bias current monolithic operational amplifier offered in an 8-pin PDIP and SO-8 package. Using advanced geometry dielectrically-isolated FET (Difet®) inputs, this monolithic amplifier achieves a high performance level. Difet fabrication eliminates isolation-junction leakage current—the main contributor to input bias current with conventional monolithic FETs. This reduces input bias current by a factor of 10 to 100. Very low input bias current can be achieved without resorting to small-geometry FETs or CMOS designs which can suffer from much larger offset voltage, voltage noise, drift, and poor power-supply rejection. The OPA129 special pinout eliminates leakage current that occurs with other op amps. Pins 1 and 4 have no internal connection, allowing circuit board guard traces— even with the surface-mount package version. OPA129 is available in 8-pin DIP and SO packages, specified for operation from –40°C to +85°C. 7 V+ –In 2 3 +In Noise-Free Cascode 6 Output 30kΩ 30kΩ 5 V– Simplified Circuit 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. Difet is a registered trademark of Texas Instruments. All other trademarks are the property of their respective owners. Copyright © 1994–2007, Texas Instruments Incorporated 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. www.ti.com
TI
Texas Instruments Incorporated
U.S.A
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