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ADS122U04

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24-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC w/ PGA, VREF, 2x IDACs & UART interface

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24-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC w/ PGA, VREF, 2x IDACs & UART interface

ADS122U04

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Product details

Parameters

Resolution (Bits) 24 Number of input channels 4 Sample rate (Max) (kSPS) 2 Interface type UART Architecture Delta-Sigma Input type Differential, Single-Ended Multi-channel configuration Multiplexed Rating Catalog Reference mode Ext, Int Input range (Max) (V) 2.85, 5.6 Input range (Min) (V) -2.85, 0 Features 50/60 Hz Rejection, Excitation Current Sources (iDACs), GPIO, Oscillator, PGA, Temp Sensor, Small Size Operating temperature range (C) -40 to 125 Power consumption (Typ) (mW) 1.4 Analog voltage AVDD (Min) (V) 2.3 Analog voltage AVDD (Max) (V) 5.5 Digital supply (Min) (V) 2.3 Digital supply (Max) (V) 5.5 open-in-new Find other Precision ADCs (<=10MSPS)

Package | Pins | Size

TSSOP (PW) 16 22 mm² 5 x 4.4 WQFN (RTE) 16 9 mm² 3 x 3 open-in-new Find other Precision ADCs (<=10MSPS)

Features

  • Current Consumption as Low as 315 µA (typ)
  • Wide Supply Range: 2.3 V to 5.5 V
  • Programmable Gain: 1 to 128
  • Programmable Data Rates: Up to 2 kSPS
  • Up to 20 Bits Effective Resolution
  • Simultaneous 50-Hz and 60-Hz Rejection at 20 SPS With Single-Cycle Settling Digital Filter
  • Two Differential or Four Single-Ended Inputs
  • Dual-Matched Programmable Current Sources:
    10 µA to 1.5 mA
  • Internal 2.048-V Reference: 5 ppm/°C (typ) Drift
  • Internal 2% Accurate Oscillator
  • Internal Temperature Sensor:
    0.5°C (typ) Accuracy
  • Three General-Purpose Inputs/Outputs
  • 2-Wire UART Compatible Interface (8-N-1 Format) With Baud Rates up to 120 kBaud and
    Auto-Baud-Rate Detection
  • Package: 3.0-mm × 3.0-mm × 0.75-mm WQFN
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Description

The ADS122U04 is a precision, 24-bit, analog-to-digital converter (ADC) that offers many integrated features to reduce system cost and component count in applications measuring small sensor signals. The device features two differential or four single-ended inputs through a flexible input multiplexer (MUX), a low-noise, programmable gain amplifier (PGA), two programmable excitation current sources, a voltage reference, an oscillator, and a precision temperature sensor.

The device can perform conversions at data rates up to 2000 samples-per-second (SPS) with single-cycle settling. At 20 SPS, the digital filter offers simultaneous 50-Hz and 60-Hz rejection for noisy industrial applications. The internal PGA offers gains up to 128. This PGA makes the ADS122U04 ideally suited for applications measuring small sensor signals, such as resistance temperature detectors (RTDs), thermocouples, thermistors, and resistive bridge sensors.

The ADS122U04 features a 2-wire, UART-compatible interface. In applications that require galvanic isolation this universal asynchronous receiver/transmitter (UART) interface minimizes the number of digital isolation channels, thus saving cost, board space, and power.

The ADS122U04 is offered in a leadless 16-pin WQFN or a 16-pin TSSOP package and is specified over a temperature range of –40°C to +125°C.

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Technical documentation

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Type Title Date
* Data sheet ADS122U04 24-Bit, 4-Channel, 2-kSPS, Delta-Sigma ADC With UART Interface datasheet (Rev. B) Oct. 19, 2018
Application note ADS124S08 3-Wire PT100 RTD Measurement Circuit w/ Low-Side Reference and 1 IDAC (Rev. B) Sep. 09, 2021
Application note Communication Methods for Data Integrity Using Delta-Sigma Data Converters (Rev. A) Aug. 23, 2021
Application note RTD Wire-Break Detection Using Precision Delta-Sigma ADCs Feb. 18, 2021
E-book Fundamentals of Precision ADC Noise Analysis Jun. 19, 2020
Application note K-type thermocouple measurement circuit with precision ADC Mar. 19, 2019
Application note A Basic Guide to Thermocouple Measurements Sep. 28, 2018
Application note A Basic Guide to RTD Measurements Jun. 19, 2018
Application note Low-Cost, Single-Chip, Diff Temp Measurement Solution Using Delta-Sigma ADCs (Rev. A) May 04, 2018
Application note Digital Filter Types in Delta-Sigma ADCs Jun. 27, 2017
Application note Reducing System Cost, Size and Power in Isolated DAQ Systems Using ADS122U04 (Rev. A) Jun. 15, 2017
User guide ADS1x2U04 Evaluation Module User's Guide May 23, 2017

Design & development

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

Hardware development

EVALUATION BOARD Download
document-generic User guide
Description

The ADS122U04 evaluation module (EVM) is a platform for evaluation of the ADS122U04 analog-to-digital converter (ADC). The ADS122U04 is a 24-bit, 2-kSPS, 4-channel, low-power delta-sigma ADC with a UART interface for sensor measurement and process control applications. The ADS122U04 also includes an (...)

Features
  • Includes all required support circuitry for ADS122U04
  • Delta-Sigma ADC EvaluaTIon Software (DELTASIGMAEVAL-GUI) enables quick configuration and analysis
  • Configurable inputs, references, and supplies
  • Easily accessible signals via test points and headers
View details

Design tools & simulation

SIMULATION MODEL Download
SBAM320.ZIP (92 KB) - IBIS Model
SIMULATION TOOL Download
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 (...)
Features
  • 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
  • (...)
View details
SIMULATION TOOL Download
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
CALCULATION TOOL Download
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 (...)
CALCULATION TOOL Download
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 (...)
Features
  • 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
  • (...)
View details

Reference designs

REFERENCE DESIGNS Download
High Precision Temperature Measurement for Heat and Cold Meters Reference Design
TIDA-01526 — This reference design implements a high-precision differential temperature measurement (DTM) subsystem using a 24-bit, low-power, delta-sigma ADC. Heat and cold meter DTM subsystems typically use two 2- or 4-wire Resistance Temperature Detectors (RTD) such as PT100, PT500, or PT1000 and can achieve (...)
document-generic Schematic
REFERENCE DESIGNS Download
Channel-to-channel isolated analog input module reference design
TIDA-010048 — This reference design is a four channel-to-channel, isolated 4–20 mA, current-loop analog input module. The design includes a short circuit, overcurrent, and overvoltage limit function for condition monitoring sensor and module applications. The major features of this analog input module (...)
document-generic Schematic

CAD/CAE symbols

Package Pins Download
TSSOP (PW) 16 View options
WQFN (RTE) 16 View options

Ordering & quality

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  • Ongoing reliability monitoring

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