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Instrumentation amp is smaller than pencil's tip

Posted: 29 Apr 2009 ?? ?Print Version ?Bookmark and Share

Keywords:in-amp? instrumentation amplifier? power consumption?

AD8235 in-amp

Analog Devices Inc. has introduced what it claims to be the smallest and lowest power instrumentation amplifier (in-amp). Smaller than the tip of a pencil, the miniscule size of the AD8235 in-amp, combined with its ultralow power consumption, is effective for power-efficient and portable, lightweight medical devices and consumer-health products, including home-use ECG monitors, infusion pumps and activity-monitoring medical devices.

With 50 percent less power consumption than similar products in the market, the in-amp can enable designs to provide longer battery life. This performance is key for compact, wearable home-based medical devices that improve patient comfort while providing doctors with continuous and reliable patient monitoring.

The AD8235 measures 1.6mm x 2mmone-third the size of competing instrumentation amplifiers. Operating on 1.8V (min) and 5.5V (max) power supplies and drawing only 40?A (max), the AD8235 is suitable for other low-power applications, including consumer-fitness products and industrial pressure and low-side current-sensing measurement equipment. These applications also benefit from the in-amp's 6nA shutdown current and 40pA bias current.

The AD8235's wide power-supply range eliminates the need for extra supplies. Its wide common-mode input-voltage range (4V and 1.4V on 5V and 1.8V supplies respectively) is important for the low-voltage operation required by many battery-powered portable applications. A high common-mode rejection ratio (CMRR) of 86dB (gain=5) effectively eliminates common-mode interference.

The AD8235 in 9-lead WLCSP is available for $1.59 each in 1,000-unit quantities. The AD8236 is available in 8-lead MSOP for $0.99 each in 1,000-unit quantities.

The AD8235 in-amp is available now in full-volume production and is compatible with a number of ADI's digital isolators and amplifiers, including the ADUM2400 quad-channel digital isolator, AD8603 precision CMOS operational amplifier, AD8607 precision amplifier and the AD8609 precision quad amplifier. It comes in standard bumped-die packaging in a reel format to simplify manufacture.

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