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AD8278ARMZ Datasheet(PDF) 1 Page - Analog Devices |
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AD8278ARMZ Datasheet(HTML) 1 Page - Analog Devices |
1 / 24 page Low Power, Wide Supply Range, Low Cost Difference Amplifiers, G = ½, 2 AD8278/AD8279 Rev. C Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other 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 ©2009–2011 Analog Devices, Inc. All rights reserved. FEATURES Wide input range beyond supplies Rugged input overvoltage protection Low supply current: 200 μA maximum (per amplifier) Low power dissipation: 0.5 mW at VS = 2.5 V Bandwidth: 1 MHz (G = ½) CMRR: 80 dB minimum, dc to 20 kHz (G = ½, B Grade) Low offset voltage drift: ±1 μV/°C maximum (B Grade) Low gain drift: 1 ppm/°C maximum (B Grade) Enhanced slew rate: 1.4 V/μs Wide power supply range Single supply: 2 V to 36 V Dual supplies: ±2 V to ±18 V 8-lead SOIC, 14-lead SOIC, and 8-lead MSOP packages APPLICATIONS Voltage measurement and monitoring Current measurement and monitoring Instrumentation amplifier building block Portable, battery-powered equipment Test and measurement GENERAL DESCRIPTION The AD8278 and AD8279 are general-purpose difference amplifiers intended for precision signal conditioning in power critical applications that require both high performance and low power. The AD8278 and AD8279 provide exceptional common- mode rejection ratio (80 dB) and high bandwidth while amplifying input signals that are 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 amplifier extends to almost triple the supply voltage (for G = ½), making the amplifer 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 amp. The AD8278 and AD8279 can be used as difference amplifiers with G = ½ or G = 2. They can also be connected in a high precision, single-ended configuration for non inverting and inverting gains of −½, −2, +3, +2, +1½, +1, or +½. The AD8278 and AD8279 provide an integrated precision solution that has a smaller size, lower cost, and better performance than a discrete alternative. The AD8278 and AD8279 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, which is ideal for battery-operated and portable systems. For unity-gain difference amplifiers with similar performance, refer to the AD8276 and AD8277 data sheets. FUNCTIONAL BLOCK DIAGRAMS 2 5 3 1 6 7 4 40kΩ 20kΩ 40kΩ –VS +VS –IN +IN SENSE OUT REF 20kΩ AD8278 Figure 1. AD8278 2 12 3 14 13 11 40kΩ 20kΩ 40kΩ +VS –INA +INA SENSEA OUTA REFA 20kΩ 6 10 5 8 9 40kΩ 20kΩ 40kΩ –INB +INB SENSEB OUTB REFB 20kΩ AD8279 4 –VS Figure 2. AD8279 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) AD8274 AD8206 (B) AMP03 AD8216 (B) 1U = unidirectional, B = bidirectional. The AD8278 is available in the space-saving 8-lead MSOP and SOIC packages, and the AD8279 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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