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Texas Instruments' ADC comes in compact package

Posted: 18 Mar 2016     Print Version  Bookmark and Share

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

Texas Instruments offers a compact analogue-to-digital converter (ADC) that operates with as little as three wires and eliminates the need for external buffers.

The ADS1257 is a low-noise, 30 kSPS, 24-bit, delta-sigma (ΔΣ) 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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