ADA2200 Analog Filter

The ADI's ADA2200 is a synchronous demodulator and configurable analog filter designed to perform precision magnitude and phase measurements in low-power, sensor signal conditioning and data acquisition applications for the industrial, medical, and communications markets.

Implemented with ADI’s patent-pending sampled analog technology (SAT), the ADA2200 is an analog input, sampled analog output device that includes an analog domain, low-pass 1/8 x decimation finite impulse response (FIR) filter, a configurable infinite impulse response (IIR) filter, mixer with 0°/90° phase selection, reference clock, and ADC driver output. Utilizing sampled analog technology, the signal processing is performed entirely in the analog domain by charge sharing among capacitors. This eliminates the effects of quantization noise and rounding errors, and reduces downstream ADC sample rates while also offloading computationally heavy tasks from the digital processor or micro-controller.

The ADA2200 acts as a precision filter when the demodulation function is disabled. The filter has a programmable bandwidth and tunable center frequency. The filter characteristics are highly stable over temperature, supply, and process variation.

Single-ended and differential signal interfaces are possible on both input and output terminals, simplifying the connection to other components of the signal chain. The low power consumption and rail-to-rail operation is ideal for battery-powered and low-voltage systems.