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Space-saving precision amp is highly integrated

Posted: 15 Dec 2008 ?? ?Print Version ?Bookmark and Share

Keywords:precision amplifier? save board space? industrial application?


Analog Devices Inc. has released the AD8295, a highly integrated precision instrumentation amplifier front-end that uses 50 percent less board space than competing amplifier solutions for industrial and instrumentation applications.

Incorporating an instrumentation amplifier with two uncommitted operational amplifiers and two precision-trimmed matched resistors in a single 4mm x 4mm chip-scale package, the AD8295 in amp provides an integrated front end for industrial process controls, precision DAQ systems, medical instrumentation equipment and Wheatstone bridge measurement applications. As part of a complete signal chain, the AD8295 in amp works well with a wide range of ADI's ADCs, including the AD7656, AD7763 and AD7690, and multiplexers, such as ADI's ADG1209.

The AD8295 in amp delivers the highest common-mode rejection (CMR) over frequency in its class. The CMR of competing devices typically falls off at 200 Hz, while the AD8295 maintains a minimum CMR of 80dB to 8kHz for all grades at G = 1. High CMR over frequency allows the AD8295 to reject wideband interference and line harmonics, greatly simplifying filter design. The on-board in amp is gain-programmable and uses a single resistor to set the gain from 1 to 1,000, delivering 1 ppm/C maximum gain drift (B grade), 8 nV/?Hz maximum input voltage noise at 1 kHz, and 0.25?V p-p input noise (0.1Hz to 10Hz).

The AD8295 operates on both single and dual supplies and is well suited for applications where 10 V input voltages are encountered. The entire chip (in amp and two op amps) uses only 2mA of total current, allowing for more channel density and lower cost designs. The AD8295 components are arranged in a logical way so that typical application circuits, such as a differential ADC driver or an in amp with output filtering, have short routes and few vias. Unlike most chip-scale packages, the AD8295 does not have an exposed metal pad on the back of the part, freeing additional space for routing and vias.

The AD8295 is available in 16-lead LFCSP for $2.89 in 1,000 pieces. Temperature range is -40C to +85C.

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