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AD8276 Datasheet(PDF) 1 Page - Analog Devices |
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AD8276 Datasheet(HTML) 1 Page - Analog Devices |
1 / 20 page Low Power, Wide Supply Range, Low Cost Unity-Gain Difference Amplifiers AD8276/AD8277 Rev. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2009 Analog Devices, Inc. All rights reserved. FEATURES Wide input range beyond supplies Rugged input overvoltage protection Low supply current: 200 μA maximum per channel Low power dissipation: 0.5 mW at VS = 2.5 V Bandwidth: 550 kHz CMRR: 86 dB minimum, dc to 10 kHz Low offset voltage drift: ±2 μV/°C maximum (B Grade) Low gain drift: 1 ppm/°C maximum (B Grade) Enhanced slew rate: 1.1 V/μs Wide power supply range: Single supply: 2 V to 36 V Dual supplies: ±2 V to ±18 V APPLICATIONS Voltage measurement and monitoring Current measurement and monitoring Differential output instrumentation amplifier Portable, battery-powered equipment Test and measurement GENERAL DESCRIPTION The AD8276/AD8277 are general-purpose, unity-gain difference amplifiers intended for precision signal conditioning in power critical applications that require both high performance and low power. They provide exceptional common-mode rejection ratio (86 dB) and high bandwidth while amplifying signals well beyond the supply rails. The on-chip resistors are laser-trimmed for excellent gain accuracy and high CMRR. They also have extremely low gain drift vs. temperature. The common-mode range of the amplifiers extends to almost double the supply voltage, making these amplifiers ideal for single- supply applications that require a high common-mode voltage range. The internal resistors and ESD circuitry at the inputs also provide overvoltage protection to the op amps. The AD8276/AD8277 are unity-gain stable. While they are optimized for use as difference amplifiers, they can also be connected in high precision, single-ended configurations with G = −1, +1, +2. The AD8276/AD8277 provide an integrated precision solution that has smaller size, lower cost, and better performance than a discrete alternative. The AD8276/AD8277 operate on single supplies (2.0 V to 36 V) or dual supplies (±2 V to ±18 V). The maximum quiescent supply current is 200 μA per channel, which is ideal for battery- operated and portable systems. FUNCTIONAL BLOCK DIAGRAM 2 5 3 1 6 7 4 40kΩ 40kΩ 40kΩ –VS +VS –IN +IN SENSE OUT REF 40kΩ AD8276 Figure 1. AD8276 2 12 3 14 13 11 40kΩ 40kΩ 40kΩ +VS –INA +INA SENSEA OUTA REFA 40kΩ AD8277 6 10 5 8 9 4 40kΩ 40kΩ 40kΩ –VS –INB +INB SENSEB OUTB REFB 40kΩ Figure 2. AD8277 Table 1. Difference Amplifiers by Category Low Distortion High Voltage Current Sensing1 Low Power AD8270 AD628 AD8202 (U) AD8276 AD8271 AD629 AD8203 (U) AD8277 AD8273 AD8205 (B) AD8278 AD8274 AD8206 (B) AMP03 AD8216 (B) 1 U = unidirectional, B = bidirectional. The AD8276 is available in the space-saving 8-lead MSOP and SOIC packages, and the AD8277 is offered in a 14-lead SOIC package. Both are specified for performance over the industrial temperature range of −40°C to +85°C and are fully RoHS compliant. |
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