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AD8278BRZ-RL Fiches technique(PDF) 1 Page - Analog Devices |
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AD8278BRZ-RL Fiches technique(HTML) 1 Page - Analog Devices |
1 / 24 page Low Power, Wide Supply Range, Low Cost Difference Amplifier, G = ½, 2 AD8278 Rev. 0 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 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) Low offset voltage drift: ±2 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 and MSOP packages APPLICATIONS Voltage measurement and monitoring Current measurement and monitoring Instrumentation amplifier building block Portable, battery-powered equipment Test and measurement FUNCTIONAL BLOCK DIAGRAM 2 5 3 1 6 7 4 40kΩ 20kΩ 40kΩ –VS +VS –IN +IN SENSE OUT REF 20kΩ AD8278 Figure 1. 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) 1 U = unidirectional, B = bidirectional. GENERAL DESCRIPTION The AD8278 is a general-purpose difference amplifier intended for precision signal conditioning in power critical applications that require both high performance and low power. The AD8278 provides exceptional common-mode rejection ratio (80 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 amplifier extends to almost triple the supply voltage (for G = ½), making it 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 can be used as a difference amplifier with G = ½ or G = 2. It 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 provides an integrated precision solution that has a smaller size, lower cost, and better performance than a discrete alternative. The AD8278 operates 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 makes it ideal for battery-operated and portable systems. The AD8278 is available in the space-saving 8-lead MSOP and SOIC packages. It is specified for performance over the industrial temperature range of −40°C to +85°C and is fully RoHS compliant. |
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