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AD515AJ Datasheet(PDF) 1 Page - Analog Devices |
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AD515AJ Datasheet(HTML) 1 Page - Analog Devices |
1 / 6 page REV. A 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 AD515A One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 World Wide Web Site: http://www.analog.com Fax: 617/326-8703 © Analog Devices, Inc., 1997 Monolithic Precision, Low Power FET-Input Electrometer Op Amp PIN CONFIGURATION FEATURES Ultralow Bias Current: 75 fA max (AD515AL) Ultralow Bias Current: 150 fA max (AD515AK) Ultralow Bias Current: 300 fA max (AD515AJ) Low Power: 1.5 mA max Quiescent Current Low Power: (0.6 mA typ) Low Offset Voltage: 1.0 mV max (AD515AK & L) Low Drift: 15 V/ C max (AD515AK) Low Noise: 4 V p-p, 0.1 Hz to 10 Hz PRODUCT DESCRIPTION The AD515A is a monolithic FET-input operational amplifier with a guaranteed maximum input bias current of 75 fA (AD515AL). The AD515A is a monolithic successor to the industry standard AD515 electrometer, and will replace the AD515 in most applications. The AD515A also delivers laser- trimmed offset voltage, low drift, low noise and low power, a combination of features not previously available in ultralow bias current circuits. All devices are internally compensated, protected against latch-up and are short circuit protected. The AD515A’s combination of low input bias current, low offset voltage and low drift optimizes it for a wide variety of electrometer and very high impedance buffer applications including photocurrent detection, vacuum ion-gage measure- ment, long-term precision integration and low drift sample/hold applications. This amplifier is also an excellent choice for all forms of biomedical instrumentation such as pH/pIon sensitive elec- trodes, very low current oxygen sensors, and high impedance biological microprobes. In addition, the low cost and pin compatibility of the AD515A with standard FET op amps will allow designers to upgrade the performance of present systems at little or no additional cost. The 10 15 Ω common-mode input impedance ensures that the input bias current is essentially independent of common-mode voltage. As with previous electrometer amplifier designs from Analog Devices, the case is brought out to its own connection (Pin 8) so it can be independently connected to a point at the same potential as the input, thus minimizing stray leakage to the case. This feature will also shield the input circuitry from external noise and supply transients. The AD515A is available in three versions of bias current and offset voltage, the “J”, “K” and “L”; all are specified for rated performance from 0 °C to +70°C and supplied in a hermetically sealed TO-99 package. PRODUCT HIGHLIGHTS 1. The AD515A provides subpicoampere bias currents in an integrated circuit amplifier. • The ultralow input bias currents are specified as the maxi- mum measured at either input with the device fully warmed up on ±15 V supplies at +25°C ambient with no heat sink. This parameter is 100% tested. • By using ±5 V supplies, input bias current can typically be brought below 50 fA. 2. The input offset voltage on all grades is laser trimmed, typically less than 500 µV. • The offset voltage drift is 15 µV/°C maximum on the K grade. • If additional pulling is desired, the amount required will have a minimal effect on offset drift (approximately 3 µV/°C per mV). 3. The low quiescent current drain of 0.6 mA typical and 1.5 mA maximum, keeps self-heating effects to a minimum and renders the AD515A suitable for a wide range of remote probe applications. 4. The combination of low input noise voltage and very low input noise current is such that for source impedances from 1M Ω to 1011 Ω, the Johnson noise of the source will easily dominate the noise characteristic. |
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