Texas Instruments ADS1271 Data Sheet/Manual
Summary
This high-performance ADS1271 is a 24-bit, delta-sigma analog-to-digital converter designed for demanding signal acquisition. It merges industry robustness with superior audio performance, offering up to 105kSPS at excellent resolution and low drift. The manual details its key operating modes (High-Speed/Low-Power), flexible interface options, and comprehensive specifications. Ideal for engineers developing test and measurement equipment, vibration analyzers, acoustic monitoring systems, or industrial pressure sensing applications.
Page 1 Text Content
SBAS306A − NOVEMBER 2004 − REVISED DECEMBER 2004
FEATURES DESCRIPTION 105k SPS Data Rate
The ADS1271 is a 24-bit, delta-sigma analog-to-digital AC Performance: converter (ADC) with a data rate up to 105k SPS. It offers 51k Hz Bandwidth a unique combination of excellent DC accuracy and 109d B SNR (High-Resolution Mode) outstanding AC performance. The high-order, −105d B THD chopper-stabilized modulator achieves very low drift with low in-band noise. The onboard decimation filter
DC Accuracy:
suppresses modulator and signal out-of-band noise. The
1.8µV/°C Offset Drift
ADS1271 provides a usable signal bandwidth up to 90%
2ppm/°C Gain Drift
of the Nyquist rate with less than 0.005d B of ripple.
Selectable Operating Modes:
Traditionally, industrial delta-sigma ADCs offering good
High-Speed: 105k SPS Data Rate
drift performance use digital filters with large passband
High-Resolution: 109d B SNR
droop. As a result, they have limited signal bandwidth and
Low-Power: 35m W Dissipation
are mostly suited for DC measurements. High-resolution
Power-Down Control
ADCs in audio applications offer larger usable bandwidths, Digital Filter: but the offset and drift specification are significantly Linear Phase Response weaker than their industrial counterparts. The ADS1271 Passband Ripple: ±0.005d B combines these converters, allowing high-precision Stop Band Attenuation: 100d B industrial measurement with excellent DC and AC specifications ensured over an extended industrial
Internal Offset Calibration On Command
temperature range.
Selectable SPI or Frame Sync Serial Interface
Three operating modes allow for optimization of speed,
Designed for Multichannel Systems:
resolution, and power. A selectable SPI or a frame-sync
Daisy-Chainable Serial Interface
serial interface provides for convenient interfacing to
Easy Synchronization
microcontrollers or DSPs. All operations, including internal Simple Pin-Driven Control offset calibration, are controlled directly by pins; there are no registers to program.
Specified from −40°C to +105°C Analog Supply: 5V
VREFP VREFN AVDD DVDD
Digital Supply: 1.8V to 3.3V
Control SYNC/PDWN
APPLICATIONS Logic MODE Vibration/Modal Analysis
Acoustics
DRDY/FSYNC
Dynamic Strain Gauges ∆Σ SCLK
Digital Serial
Modulator DOUT
Filter Interface
Pressure Sensors
AINN DIN
Test and Measurement FORMAT
DGNDAGND
www.ti.com
Page Summary Contents For Texas Instruments ADS1271 Data Sheet/Manual
Manual Details
| Brand | Texas Instruments |
|---|---|
| Pages | 29 |
| File Size | 381.30 KB |
| Published | July 10, 2026 |
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Frequently Asked Questions
What serial interfaces are available for connecting to a microcontroller?
It features a selectable SPI or Frame Sync Daisy-Chainable Serial Interface.
What is the maximum guaranteed signal-to-noise ratio (SNR)?
The device offers a High-Resolution of 109dB SNR.
What is the acceptable operating temperature range for the ADC?
It is rated to operate from -40°C to +105°C.
What are the required voltage ranges for the analog and digital supplies?
The Analog Supply (AVDD) requires 5V, while the Digital Supply (DVDD) accepts 1.8V to 3.3V.