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ADS1257 works for space-constrained applications

Posted: 18 Mar 2016 ?? ?Print Version ?Bookmark and Share

Keywords:analogue-to-digital converter? integrated multiplexer? input buffer? programmable gain amplifier?

Texas Instruments offers an analogue-to-digital converter (ADC) that combines integration, high conversion rate and a 24-bit resolution in a compact package.

The ADS1257 is a low-noise, 30 kSPS, 24-bit, delta-sigma () analogue-to-digital converter (ADC) with an integrated multiplexer, input buffer, and programmable gain amplifier (PGA). It comes in a small 20-pin, 5mm 5mm VQFN package and is ideally suited for space-constrained applications.

The input multiplexer accepts either two differential or three single-ended input measurements. The sensor break circuit verifies the input connection continuity to the ADC. The selectable input buffer greatly increases the input impedance and, in many cases, eliminates the need for external buffers.

The buffer input voltage range includes AGND. The low-noise PGA provides gains from 1 to 64 to accommodate a wide range of inputs (from 78mV to 5V). The programmable digital filter optimises ADC resolution (up to 23 bits noise-free) and conversion rates (up to 30kSPS). The digital filter provides single-cycle settled conversions, and rejection of 50Hz and 60Hz interference signals.

The SPI-compatible serial interface operates with as little as three wires, simplifying connections to external controllers. Integrated calibration features support both self and system correction of offset and gain errors for all PGA gain settings. Two bidirectional digital I/Os pins control external circuits.

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