The ADS1271 is a 24-bit, delta-sigma analog-to-digital converter (ADC) from Texas Instruments (TI) with a data rate up to 105kSPS, offering a unique combination of excellent DC accuracy and outstanding AC performance.
The ADS1271 is a 24‑bit, delta‑sigma analog‑to‑digital converter designed for multichannel measurement systems. It provides three selectable operating modes—High‑Speed (105 kSPS), High‑Resolution (109 dB SNR) and Low‑Power (35 mW dissipation)—and supports both SPI and Frame‑Sync serial interfaces for easy integration with microcontrollers or DSPs. The device features a linear‑phase digital filter with +0.005 dB pass‑band ripple and 100 dB stop‑band attenuation, delivering a usable bandwidth of 51 kHz.
The ADS1271 operates over an industrial temperature range of –40 °C to +105 °C and is supplied by a 5 V analog supply and a 1.8 V–3.3 V digital supply. Pin‑driven control eliminates the need for internal registers, and an internal offset calibration can be triggered on command. The datasheet includes absolute‑maximum ratings, detailed electrical characteristics, pin assignments for the TSSOP‑16 package, and timing specifications for both SPI and Frame‑Sync formats.
| Resolution | 24 bits |
|---|---|
| High‑Speed Data Rate | 105 kSPS |
| Signal‑to‑Noise Ratio (High‑Resolution mode) | 109 dB |
| Total Harmonic Distortion | -108 dB |
| Power‑Down Dissipation (Low‑Power mode) | 35 mW |
| Analog Supply Voltage | 5 V |
| Digital Supply Voltage | 1.8 V to 3.3 V |
| Bandwidth | 51 kHz |
| Pass‑band Ripple | +0.005 dB |
| Stop‑band Attenuation | 100 dB |
| Package | TSSOP‑16 |
In High‑Speed mode the ADS1271 can sample at up to 105 kSPS.
The SYNC/PDWN pin can be driven low to activate the Power‑Down control.
It supports a selectable SPI or Frame‑Sync serial interface.