24-Bit, 105kSPS, 1-Ch Delta-Sigma ADC for Wide Bandwidth Applications


Product details


Resolution (Bits) 24 Number of input channels 1 Sample rate (Max) (kSPS) 105 Interface type SPI Architecture Delta-Sigma Input type Differential Multi-channel configuration Rating Catalog Reference mode Ext Input range (Max) (V) 5.25 Input range (Min) (V) 0 Features Daisy-Chainable Operating temperature range (C) -40 to 105 Power consumption (Typ) (mW) 92 Analog voltage AVDD (Min) (V) 4.75 SNR (dB) 109 Analog voltage AVDD (Max) (V) 5.25 Digital supply (Min) (V) 1.65 Digital supply (Max) (V) 3.6 open-in-new Find other Precision ADCs (<=10MSPS)

Package | Pins | Size

TSSOP (PW) 16 22 mm² 4.4 x 5 open-in-new Find other Precision ADCs (<=10MSPS)


  • 105kSPS Data Rate
  • AC Performance:
    51kHz Bandwidth
    109dB SNR (High-Resolution Mode)
    –108dB THD
  • DC Accuracy:
    1.8µV/°C Offset Drift
    2ppm/°C Gain Drift
  • Selectable Operating Modes:
    High-Speed: 105kSPS Data Rate
    High-Resolution: 109dB SNR
    Low-Power: 35mW Dissipation
  • Power-Down Control
  • Digital Filter:
    Linear Phase Response
    Passband Ripple: ±0.005dB
    Stop Band Attenuation: 100dB
  • Internal Offset Calibration On Command
  • Selectable SPI&™ or Frame Sync Serial Interface
  • Designed for Multichannel Systems:
    Daisy-Chainable Serial Interface
    Easy Synchronization
  • Simple Pin-Driven Control
  • Modulator Output Option
  • Specified from –40°C to +105°C
  • Analog Supply: 5V
  • Digital Supply: 1.8V to 3.3V
    • Vibration/Modal Analysis
    • Acoustics
    • Dynamic Strain Gauges
    • Pressure Sensors
    • Test and Measurement

SPI is a trademark of Motorola Inc. All other trademarks are the property of their respective owners.

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The ADS1271 is a 24-bit, delta-sigma analog-to-digital converter (ADC) with a data rate up to 105kSPS. 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 0.005dB of ripple.

Traditionally, industrial delta-sigma ADCs offering good drift performance use digital filters with large passband droop. As a result, they have limited signal bandwidth and are mostly suited for DC measurements. High-resolution ADCs in audio applications offer larger usable bandwidths, but the offset and drift specification are significantly weaker than their industrial counterparts. The ADS1271 combines these converters, allowing high-precision industrial measurement with excellent DC and AC specifications ensured over an extended industrial temperature range.

Three operating modes allow for optimization of speed, resolution, and power. A selectable SPI or a frame-sync serial interface provides for convenient interfacing to microcontrollers or DSPs. The output from the modulator is accessible for external digital filter applications. All operations, including internal offset calibration, are controlled directly by pins; there are no registers to program.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 7
Type Title Date
* Datasheet 24-Bit, Wide Bandwidth Analog-to-Digital Converter datasheet (Rev. F) Oct. 23, 2007
White papers Fundamentals of Precision ADC Noise Analysis Jun. 19, 2020
Application notes Digital Filter Types in Delta-Sigma ADCs Jun. 27, 2017
White papers Voltage-reference impact on total harmonic distortion Aug. 01, 2016
White papers Best of Baker's Best: Precision Data Converters -- Delta-Sigma ADCs Mar. 19, 2015
User guides ADS1271EVM User's Guide (Rev. C) Nov. 19, 2014
Application notes Synchronizing the ADS1271 Oct. 27, 2005

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide

The ADS1271EVM is a circuit board for use with the ADS1271 24-bit analog-to-digital converter. Two ADS1271 devices are installed on this board to demonstrate multiple parts operating in a simultaneously sampled, daisy-chained configuration. The installed ADS1271s can be configured to operate in any (...)

  • Full-featured evaluation board for the ADS1271 24-bit Analog to Digital Converter
  • Two ADS1271 converters on board illustrate use of daisy-chain mode
  • On-board reference and oscillator circuits
  • Modular design for use with a variety of Texas Instruments Processors and interface boards.
document-generic User guide

The ADS1271EVM-PDK is a complete evaluation kit for the ADS1271, which includes an ADS1271EVM and a USB-connected DSP-based motherboard and evaluation software for use with a personal computer running Microsoft Windows XP operating systems. With this software, the operational modes of the ADS1271 (...)

  • Works with Windows XP only
  • Ability to record data to a file for subsequent analysis
  • USB interface for fast data transfer
  • Both AC and DC analysis tools
document-generic User guide

This board supports: TAS2555YZEVMTAS2557EVM and TAS2559EVM.

The Smart Amplifier Speaker Characterization Board, when used in conjunction with a supported TI Smart Amplifier and PurePath Console software, provides users the ability to measure speaker excursion, temperature and other parameters for (...)

  • Easily and quickly characterize speakers
  • Quick connection to TI Smart Amplifier EVMs
  • Microphone included for SPL measurements
  • Laser input for speaker excursion measurements

Software development

DCPFREETOOL Software Plug-In to Code Composer Studio
DCPFREETOOL The data converter support plug-in is a free tool, which allows the user of Code Composer Studio™ to create initialization data and configuration software for Texas Instruments data converters based on inputs on a graphical user interface.

IMPORTANT: Please read the following before downloading the (...)


The data converter support plug-in (DCP) is a component of TI's Code Composer Studio™ and offers easy-to-use windows for the "point-and-click" configuration of TI's data converters from within the integrated development environment (IDE), preventing illegal combinations of settings. The DCP (...)

Design tools & simulation

SBAM115.ZIP (104 KB) - IBIS Model
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SPICE-based analog simulation program
TINA-TI TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
document-generic User guide
Analog-to-digital converter (ADC) input driver design tool supporting multiple input types
ADC-INPUT-CALC ADC-INPUT-CALC is an online tool that provides support for designing the input buffer to an analog-to-digital converter (ADC). It offers 24 different op-amp based buffer circuits that can be used to drive an ADC input. The available topologies cover differential, single-ended and transformer-coupled (...)
ADS1271 Excel™ Calculator Tool
    The ADS1271 Excel calculator tool provides the user with several easy-to-use tools to simplify the configuration of the ADS1271. The tool helps the user understand the different settings and operating modes that aid in optimizing a design with the ADS1271 wide-bandwidth analog-to-digital converter (...)
  • ADC code conversions
  • Digital filter plot
  • Daisy-chain configuration
  • SNR estimator
Analog engineer's calculator
ANALOG-ENGINEER-CALC — The Analog Engineer’s Calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting op-amp gain with feedback (...)
  • Expedites circuit design with analog-to-digital converters (ADCs) and digital-to-analog converters (DACs)
    • Noise calculations
    • Common unit translation
  • Solves common amplifier circuit design problems
    • Gain selections using standard resistors
    • Filter configurations
    • Total noise for common amplifier configurations
  • (...)

CAD/CAE symbols

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