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AD820BN Scheda tecnica(PDF) 1 Page - Analog Devices |
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AD820BN Scheda tecnica(HTML) 1 Page - Analog Devices |
1 / 16 page CONNECTION DIAGRAMS 8-Lead Plastic Mini-DIP 8-Lead SOIC REV. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a Single Supply, Rail to Rail Low Power FET-Input Op Amp AD820 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1999 FEATURES True Single Supply Operation Output Swings Rail-to-Rail Input Voltage Range Extends Below Ground Single Supply Capability from +3 V to +36 V Dual Supply Capability from 1.5 V to 18 V Excellent Load Drive Capacitive Load Drive Up to 350 pF Minimum Output Current of 15 mA Excellent AC Performance for Low Power 800 A Max Quiescent Current Unity Gain Bandwidth: 1.8 MHz Slew Rate of 3.0 V/ s Excellent DC Performance 800 V Max Input Offset Voltage 1 V/ C Typ Offset Voltage Drift 25 pA Max Input Bias Current Low Noise 13 nV/ √Hz @ 10 kHz APPLICATIONS Battery Powered Precision Instrumentation Photodiode Preamps Active Filters 12- to 14-Bit Data Acquisition Systems Medical Instrumentation Low Power References and Regulators PRODUCT DESCRIPTION The AD820 is a precision, low power FET input op amp that can operate from a single supply of +3.0 V to 36 V, or dual supplies of ±1.5 V to ±18 V. It has true single supply capability with an input voltage range extending below the negative rail, 50 0 10 15 5 1 10 0 30 20 25 35 40 45 9 8 7 6 5 4 3 2 INPUT BIAS CURRENT – pA Figure 1. Typical Distribution of Input Bias Current allowing the AD820 to accommodate input signals below ground in the single supply mode. Output voltage swing extends to within 10 mV of each rail providing the maximum output dynamic range. Offset voltage of 800 µV max, offset voltage drift of 1 µV/°C, typ input bias currents below 25 pA and low input voltage noise provide dc precision with source impedances up to a Gigaohm. 1.8 MHz unity gain bandwidth, –93 dB THD at 10 kHz and 3 V/ µs slew rate are provided for a low supply current of 800 µA. The AD820 drives up to 350 pF of direct capacitive load and provides a minimum output current of 15 mA. This allows the amplifier to handle a wide range of load conditions. This combination of ac and dc performance, plus the outstand- ing load drive capability, results in an exceptionally versatile amplifier for the single supply user. The AD820 is available in three performance grades. The A and B grades are rated over the industrial temperature range of –40 °C to +85°C. There is 3 V grade—the AD820A-3V, rated over the industrial temperature range. The AD820 is offered in two varieties of 8-lead package: plastic DIP, and surface mount (SOIC). Figure 2. Gain of +2 Amplifier; VS = +5, 0, VIN = 2.5 V Sine Centered at 1.25 Volts 1 2 3 4 8 7 6 5 TOP VIEW (Not to Scale) AD820 NULL –IN +IN –VS NC +VS VOUT NULL 1 2 3 4 8 7 6 5 TOP VIEW (Not to Scale) AD820 NC –IN +IN –VS NC +VS VOUT NC NC = NO CONNECT |
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