Product details

Resolution (Bits) 24 Number of input channels 2 Sample rate (Max) (kSPS) 128 Interface type SPI Architecture Delta-Sigma Input type Differential, Single-Ended Multi-channel configuration Simultaneous Sampling Rating Catalog Reference mode Ext, Int Input range (Max) (V) 4.5 Input range (Min) (V) -1.5 Features Daisy-Chainable Operating temperature range (C) -40 to 125 Power consumption (Typ) (mW) 6.2 Analog voltage AVDD (Min) (V) 3 SNR (dB) 115.2 Analog voltage AVDD (Max) (V) 5.5 Digital supply (Min) (V) 1.65 Digital supply (Max) (V) 3.6
Resolution (Bits) 24 Number of input channels 2 Sample rate (Max) (kSPS) 128 Interface type SPI Architecture Delta-Sigma Input type Differential, Single-Ended Multi-channel configuration Simultaneous Sampling Rating Catalog Reference mode Ext, Int Input range (Max) (V) 4.5 Input range (Min) (V) -1.5 Features Daisy-Chainable Operating temperature range (C) -40 to 125 Power consumption (Typ) (mW) 6.2 Analog voltage AVDD (Min) (V) 3 SNR (dB) 115.2 Analog voltage AVDD (Max) (V) 5.5 Digital supply (Min) (V) 1.65 Digital supply (Max) (V) 3.6
TQFP (PBS) 32 49 mm² 7 x 7
  • 2 or 4 simultaneous-sampling differential inputs
  • Data rates up to 128 kSPS
  • High performance:
    • Single-channel accuracy: better than 0.1% at 10,000:1 dynamic range
    • Effective resolution: 20.6 bits at 8 kSPS
    • THD: –100 dB at 50 Hz and 60 Hz
  • Integrated negative charge pump allows absolute input voltages below ground
  • Flexible analog power-supply operation:
    • Using negative charge pump: 3.0 V to 3.45 V
    • Unipolar supply: 3.3 V to 5.5 V
    • Bipolar supply: ±2.5 V
  • Digital supply: 1.65 V to 3.6 V
  • Low-drift internal voltage reference: 6 ppm/°C
  • ADC self checks
  • Cyclic redundancy check (CRC) and hamming code error correction on communications
  • Multiple SPI data interface modes:
    • Asynchronous interrupt
    • Synchronous master and slave
  • Package: 32-pin TQFP
  • Operating temperature range:
    –40°C to +125°C
  • 2 or 4 simultaneous-sampling differential inputs
  • Data rates up to 128 kSPS
  • High performance:
    • Single-channel accuracy: better than 0.1% at 10,000:1 dynamic range
    • Effective resolution: 20.6 bits at 8 kSPS
    • THD: –100 dB at 50 Hz and 60 Hz
  • Integrated negative charge pump allows absolute input voltages below ground
  • Flexible analog power-supply operation:
    • Using negative charge pump: 3.0 V to 3.45 V
    • Unipolar supply: 3.3 V to 5.5 V
    • Bipolar supply: ±2.5 V
  • Digital supply: 1.65 V to 3.6 V
  • Low-drift internal voltage reference: 6 ppm/°C
  • ADC self checks
  • Cyclic redundancy check (CRC) and hamming code error correction on communications
  • Multiple SPI data interface modes:
    • Asynchronous interrupt
    • Synchronous master and slave
  • Package: 32-pin TQFP
  • Operating temperature range:
    –40°C to +125°C

The ADS131A02 and ADS131A04 devices are two- and four-channel, simultaneous-sampling, 24-bit, delta-sigma (ΔΣ), analog-to-digital converters (ADCs). The wide dynamic range, with scalable data rates up to 128 kSPS, and internal fault monitors make the ADS131A02 or ADS131A04 a good choice when designing for energy monitoring, grid protection, and control applications. The ADC inputs can be independently and directly interfaced to a resistor-divider network, a current transformer, or a Rogowski coil to measure voltage or current. Flexible power-supply options, including an internal negative charge pump, are available to maximize the effective resolution for high dynamic range applications.

Asynchronous and synchronous master and slave interface options are available, providing ADC configuration flexibility when chaining multiple devices in a single system. Several interface checks, ADC startup checks, and data integrity checks can be enabled on the interface to report errors in the ADC and during data transfer.

The complete analog front-end (AFE) solutions are packaged in a 32-pin TQFP package and are specified over the industrial temperature range of –40°C to +125°C.

The ADS131A02 and ADS131A04 devices are two- and four-channel, simultaneous-sampling, 24-bit, delta-sigma (ΔΣ), analog-to-digital converters (ADCs). The wide dynamic range, with scalable data rates up to 128 kSPS, and internal fault monitors make the ADS131A02 or ADS131A04 a good choice when designing for energy monitoring, grid protection, and control applications. The ADC inputs can be independently and directly interfaced to a resistor-divider network, a current transformer, or a Rogowski coil to measure voltage or current. Flexible power-supply options, including an internal negative charge pump, are available to maximize the effective resolution for high dynamic range applications.

Asynchronous and synchronous master and slave interface options are available, providing ADC configuration flexibility when chaining multiple devices in a single system. Several interface checks, ADC startup checks, and data integrity checks can be enabled on the interface to report errors in the ADC and during data transfer.

The complete analog front-end (AFE) solutions are packaged in a 32-pin TQFP package and are specified over the industrial temperature range of –40°C to +125°C.

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Technical documentation

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Type Title Date
* Data sheet ADS131A0x 2- or 4-Channel, 24-Bit, 128-kSPS, Simultaneous-Sampling, Delta-Sigma ADC datasheet (Rev. E) 17 Jun 2020
Application note A Basic Guide to Bridge Measurements 18 Feb 2022
Application note Communication Methods for Data Integrity Using Delta-Sigma Data Converters (Rev. A) 23 Aug 2021
E-book Fundamentals of Precision ADC Noise Analysis 19 Jun 2020
Application note Digital Filter Types in Delta-Sigma ADCs 27 Jun 2017

Design & development

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

Evaluation board

ADS131A04EVM — ADS131A04 evaluation module

The ADS131A04 evaluation module (EVM) is a platform for evaluating the ADS131A04, which is a low-power, simultaneous-sampling, delta-sigma analog-to-digital converter (ADC). The ADS131A04EVM includes the ADS131A04EVM board and the precision host interface (PHI) controller board that enables the (...)
Support software

ADS131A04 Example C Code

SBAC267.ZIP (739 KB)
Simulation model

ADS131A02 IBIS Model

SBAM292.ZIP (76 KB) - IBIS Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
Simulation tool

TINA-TI — SPICE-based analog simulation program

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 (...)
Calculation tool

ADC-INPUT-CALC — Analog-to-digital converter (ADC) input driver design tool supporting multiple input types

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 (...)
Calculation tool

ANALOG-ENGINEER-CALC — Analog engineer's calculator

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 (...)
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Design tool

ADC-TO-VREF-SELECT — ADC to series voltage reference selection tool

The ADC-TO-VREF-SELECT tool enables the pairing of TI analog-to-digital converters (ADCs) and series voltage references. Users can select an ADC device and the desired input voltage, and the tool will list the top three voltage reference recommendations. There is also an option to use (...)
Reference designs

TIDA-00835 — High Accuracy ±0.5% Current and Isolated Voltage Measurement Ref Design Using 24-Bit Delta-Sigma ADC

The TIDA-00835 reference design allows for accurate voltage and current measurement using a bipolar input configuration by incorporating a four- channel, 24-bit simultaneously-sampling differential input Delta-Sigma ADC over wide dynamic range. The ADC is configured to measure ±2.5 V bipolar (...)
Package Pins Download
TQFP (PBS) 32 View options

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