Lowest power, low-noise sigma-delta ADC for precision measurements

May 06, 2015 // By Graham Prophet
Maxim Integrated has posted details of the MAX11214, 24-bit, 5 mW, 140d B SNR, 32 ksample/sec delta-sigma (ΔΣ) analogue/digital converter with integrated programmable gain amplifier.

Claiming the lowest power for devices in this category, Maxim suggests you might use it in automatic test equipment, high-precision portable sensors, medical equipment, scientific instrumentation, or in seismic data acquisition

Sample rates up to 32ksps allow both precision DC and AC measurements; integral nonlinearity is guaranteed to 4ppm maximum. The THD is -122dB. The MAX11214 communicates via an SPI-compatible serial interface and is available in a small 24-pin TSSOP package. The device includes a 6.5nV/√Hz noise programmable gain amplifier with gain settings between 1x to 128x. Optional buffers are also included to provide isolation of the signal inputs from the switched capacitor sampling network. This allows the ADC to be used with high-impedance sources without compromising available dynamic range.

The MAX11214 operates from a single 2.7V to 3.6V analogue supply, or split ±1.8V analogue supplies, allowing the analogue input to be sampled below ground. The digital supply range is 2.0V to 3.6V, allowing communication with 2.5V, 3V, or 3.3V logic.

Maxim Integrated; http://www.maximintegrated.com/en/products/analog/data-converters/analog...

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