The ADS1271 is a 24-bit, delta-sigma analog-to-digital converter (ADC) with a data rate up to 105 kSPS. It offers a unique combination of excellent DC accuracy and outstanding AC performance. The high-order, chopper-stabilized modulator achieves very low drift with low in-band noise. The onboard decimation filter suppresses modulator and signal out-of-band noise. The ADS1271 provides a usable signal bandwidth up to 90% of the Nyquist rate with less than 0.005 dB of ripple. Traditionally, industrial delta-sigma ADCs offering good drift performance use digital filters with linear phase response and low out-of-band noise. The ADS1271 employs a novel digital filter design that offers the same out-of-band rejection as linear phase filters, but with significantly lower in-band noise. This new digital filter design also offers low power consumption and high integration, making it an ideal choice for multichannel applications.
The ADS1271 24‑bit analog‑to‑digital converter provides high‑speed (105 kSPS) and high‑resolution (109 dB SNR) operating modes, low power consumption, and selectable SPI or frame‑sync serial interfaces. It is designed for multichannel measurement systems such as vibration analysis, strain gauges, and pressure sensors, and operates from –40 °C to +105 °C.
The datasheet includes detailed electrical characteristics, pin assignments, timing specifications for both SPI and frame‑sync formats, mechanical package dimensions, and ordering information. It also contains the standard TI warranty and availability notices.
| Resolution | 24 bits |
|---|---|
| Maximum Data Rate (High‑Speed mode) | 105 kSPS |
| Analog Supply Voltage | 5 V |
| Digital Supply Voltage | 1.8 V to 3.3 V |
The ADS1271 can operate at up to 105 kSPS in High‑Speed mode.
It supports a selectable SPI or Frame‑Sync serial interface.
Low‑Power mode dissipates about 35 mW.