Demodulator maximises battery life of portable instruments

30th October 2014

Analog Devices

Siobhan O'Gorman

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Datasheet

Utilising the company’s patent pending Sampled Analog Technology (SAT), the ADA2200 synchronous demodulator has been introduced by Analog Devices. Enabling designers of portable and low-power instrumentation to maximise battery life, the device features a configurable analogue filter. The filter also allows designers to perform precision magnitude and phase measurements on analogue signals in the presence of large noise sources.

The ADA2200 features a configurable infinite impulse response filter, a low-pass finite impulse response one or eight times decimation filter, a mixer with 0 or 90° phase selection, a reference clock and an ADC driver output. Operating from -40 to +85°C, the device is designed for input sampling rates up to 1MHz, enabling demodulation of signal input bandwidths to 30kHz and achieving 0.009º phase detection sensitivity.

According to the company, the demodulator reduces PCB area by up to 25%. Reducing system design and optimisation time and enabling circuit design reuse across multiple sensors, products and platforms, the device provides designers with flexibility.

Providing low-power consumption of 390uA at 3.3V and rail-to-rail operation, the ADA2200 is suitable for impedance measurement, gas detection, air or fluid analysis, strain gauges and proximity measurement in advanced battery-powered and low-voltage systems in the medical, industrial and communications markets.

To perform ‘digital-like’ computations in the analogue domain, the SAT technology uses charge sharing among capacitors. By processing the signal entirely in the analogue domain, the analogue-in, sampled-analogue-out device offloads computationally heavy tasks from the digital processor or MCU and is claimed to lower power consumption by up to 87%.

Offered in a 16-lead TSSOP package, the ADA2200 is priced at $2.95 each and sold in 1,000 unit quantities.