24-bit, 32-kSPS, 4-channel, simultaneous-sampling, delta-sigma ADC


Product details


Resolution (Bits) 24 Number of input channels 4 Sample rate (Max) (kSPS) 32 Interface type SPI Architecture Delta-Sigma Input type Differential Multi-channel configuration Simultaneous Sampling Rating Catalog Reference mode Int Input range (Max) (V) 3.6 Input range (Min) (V) -1.3 Features PGA, Small Size Operating temperature range (C) -40 to 125 Power consumption (Typ) (mW) 3.3 Analog voltage AVDD (Min) (V) 2.7 SNR (dB) 100 Analog voltage AVDD (Max) (V) 3.6 Digital supply (Min) (V) 2.7 Digital supply (Max) (V) 3.6 open-in-new Find other Precision ADCs (<=10MSPS)

Package | Pins | Size

TSSOP (PW) 20 42 mm² 6.5 x 6.4 WQFN (RUK) 20 9 mm² 3 x 3 open-in-new Find other Precision ADCs (<=10MSPS)


  • 4 simultaneously sampling differential inputs
  • Programmable data rate up to 32 kSPS
  • Programmable gain up to 128
  • Noise performance:
    • 102-dB dynamic range at gain = 1, 4 kSPS
    • 80-dB dynamic range at gain = 64, 4 kSPS
  • Total harmonic distortion: –100 dB
  • High-impedance inputs for direct sensor connection:
    • 330-kΩ input impedance for gains of 1, 2, and 4
    • 1-MΩ input impedance for gains of 8, 16, 32, and 64
  • Programmable channel-to-channel phase delay calibration:
    • 244-ns resolution, 8.192-MHz fCLKIN
  • Current-detect mode allows for extremely low power tamper detection
  • Fast startup: first data within 0.5 ms of supply ramp
  • Integrated negative charge pump allows input signals below ground
  • Crosstalk between channels: –120 dB
  • Low-drift internal voltage reference
  • Cyclic redundancy check (CRC) on communications and register map
  • 2.7-V to 3.6-V analog and digital supplies
  • Low power consumption: 3.3 mW at 3-V AVDD and DVDD
  • Packages: 20-pin TSSOP or 20-pin WQFN
  • Operating temperature range: –40°C to +125°C

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The ADS131M04 is a four-channel, simultaneously-sampling, 24-bit, delta-sigma (ΔΣ), analog-to-digital converter (ADC) that offers wide dynamic range, low power, and energy-measurement-specific features, making the device an excellent fit for energy metering, power metrology, and circuit breaker applications. The ADC inputs can be directly interfaced to a resistor-divider network or a power transformer to measure voltage or to a current transformer, shunt, or a Rogowski coil to measure current.

The individual ADC channels can be independently configured depending on the sensor input. A low-noise, programmable gain amplifier (PGA) provides gains ranging from 1 to 128 to amplify low-level signals. Additionally, this device integrates channel-to-channel phase calibration and offset and gain calibration registers to help remove signal-chain errors.

A low-drift, 1.2-V reference is integrated into the device reducing printed circuit board (PCB) area. Cyclic redundancy check (CRC) options can be individually enabled on the data input, data output, and register map to ensure communication integrity.

The complete analog front-end (AFE) is offered in a 20-pin TSSOP or leadless 20-pin WQFN package and is 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 ADS131M04 4-Channel, Simultaneously-Sampling, 24-Bit, Delta-Sigma ADC datasheet (Rev. C) Jan. 20, 2021
Application note Circuit for protecting ADS131M0x ADC from electrical overstress Mar. 31, 2021
Application note Two-phase Rogowski coil based electricity meter analog front-end circuit Jul. 02, 2020
E-book Fundamentals of Precision ADC Noise Analysis Jun. 19, 2020
Application note Communication Methods for Data Integrity Using Delta-Sigma Data Converters Jun. 01, 2020
White paper How to detect and harden a meter against tampering by neutral disconnection Feb. 12, 2020
User guide ADS131M04 Evaluation Module User's Guide (Rev. A) Jun. 26, 2019

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 ADS131M04 evaluation module (EVM) is a platform for evaluating the ADS131M04, which is a low-power, simultaneous-sampling, delta-sigma analog-to-digital converter (ADC).

The ADS131M04EVM kit includes the ADS131M04EVM board and a precision host interface (PHI) controller board that enables (...)

  • Onboard 3.3-V unipolar analog supply
  • Onboard 3.3-V unipolar digital supply
  • Digital header pins to connect to host microcontroller and logic analyzer
  • Terminal blocks and header pins to connect external analog input signals
  • Onboard 8.192-MHz crystal oscillator
  • USB powered; no external power supply required

Software development

ADC energy metrology library software
ADC-ENERGY-METROLOGY-LIB-SW The ADC energy metrology library software package implements various metrology parameters for energy measurement typical of electricity meters, power-distribution units (PDUs), and circuit breakers using high-performance, multichannel analog-to-digital converters (ADCs).

The ADC samples the output of (...)


The software specifically supports the calculation of various metrology parameters for energy measurement including:

  • Total and per-phase active (kWh), reactive (kvarh), and apparent energy (kVAh) with pulse-generation outputs
  • Total and per-phase active (kW), reactive (kvar), and apparent power (kVA)
  • (...)
SBAC254B.ZIP (64 KB)

Design tools & simulation

SBAM423.ZIP (62 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 (...)
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
  • (...)

Reference designs

One-phase shunt electricity meter reference design using standalone ADCs
TIDA-010036 — This reference design implements Class 0.5 single-phase energy measurement using standalone multi-channel analog-to-digital converters (ADC) to sample a shunt current sensor. With the combination of the shunt sensor and a compact magnetically immune power supply, the design provides protection (...)
document-generic Schematic document-generic User guide
High accuracy split-phase CT electricity meter reference design using standalone ADCs
TIDA-010037 — This reference design implements Class 0.1 split-phase energy measurement using high-performance, multi-channel analog-to-digital converters (ADC). The independent ADC samples the output of current transformers (CT) at 8 kHz to measure the current and voltage of each leg of the AC mains. The (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
TSSOP (PW) 20 View options
WQFN (RUK) 20 View options

Ordering & quality

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