ADS1260

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24-bit, 40-kSPS, 5-ch delta-sigma ADC with PGA, VREF and IDACs for factory automation

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Product details

Parameters

Resolution (Bits) 24 Number of input channels 5 Sample rate (Max) (kSPS) 40 Interface type SPI Architecture Delta-Sigma Input type Differential, Single-Ended Multi-channel configuration Multiplexed Rating Catalog Reference mode Ext, Int Input range (Max) (V) 2.5, 5 Input range (Min) (V) -2.5, 0 Features 50/60 Hz Rejection, Excitation Current Sources (iDACs), Oscillator, PGA, Temp Sensor Operating temperature range (C) -40 to 125 Power consumption (Typ) (mW) 20 Analog voltage AVDD (Min) (V) 4.75 Analog voltage AVDD (Max) (V) 5.25 Digital supply (Min) (V) 2.7 Digital supply (Max) (V) 5.25 open-in-new Find other Precision ADCs (<=10MSPS)

Package | Pins | Size

VQFN (RHB) 32 25 mm² 5 x 5 open-in-new Find other Precision ADCs (<=10MSPS)

Features

  • 24-bit, high-precision ADCs
    • Offset drift: 1 nV/°C
    • Gain drift: 0.5 ppm/°C
    • Noise: 30 nVRMS (20 SPS, gain = 128)
    • Linearity: 2 ppm
  • CMOS PGA gain: 1 to 128
  • Wide input voltage range: ±7 mV to ±5 V
  • Data rate: 2.5 SPS to 40 kSPS
  • 2.5-V reference: 2 ppm/°C
  • Simultaneous 50-Hz and 60-Hz rejection mode
  • Single-cycle settling mode
  • Signal and reference monitors
  • 5-V or ±2.5-V power supply
  • Internal temperature sensor
  • Cyclic redundancy check (CRC)
  • Excitation current sources
  • Sensor burn-out current sources
  • Four general-purpose inputs/outputs (ADS1261)
  • AC excitation for bridge sensors (ADS1261)
  • 5-mm × 5-mm VQFN package
open-in-new Find other Precision ADCs (<=10MSPS)

Description

The ADS1260 and ADS1261 (ADS126x) are precision, 40-kSPS, delta-sigma (ΔΣ) analog-to-digital converters (ADCs) that include a programmable gain amplifier (PGA). The devices also include a precision voltage reference and internal fault monitors. The sensor-ready ADCs give a high-accuracy, single-chip solution for the most demanding measurements, for example, weigh scales and resistance temperature detectors (RTDs).

The ADCs contain an input signal multiplexer, a low-noise PGA (with gains from 1 to 128), a 24-bit ΔΣ modulator, a precision voltage reference, and a programmable digital filter.

The high-impedance PGA inputs (1 GΩ) decrease measurement error due to sensor loading. The ADS1260 supports three differential or five single-ended inputs. The ADS1261 supports five differential or ten single-ended inputs. The integrated current sources simplify the measurement of RTDs.

The flexible digital filter is programmable for single-cycle settled conversions, while supplying simultaneous 50-Hz and 60-Hz line cycle rejection. Signal and reference monitors, a temperature sensor, and CRC data verification make data reliability better.

The ADS126x are pin compatible devices given in a 5-mm × 5-mm VQFN package and are specified across the –40°C to +125°C temperature range.

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Technical documentation

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Type Title Date
* Data sheet ADS126x Precision, 5-channel and 10-channel, 40-kSPS, 24-bit, delta-sigma ADCs with PGA and monitors datasheet (Rev. C) Jan. 22, 2019
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 Enabling precision delta‐sigma ADCs in functional safety applications Mar. 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

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 ADS1261 evaluation module (EVM) is a platform for evaluating the ADS1261 analog-to-digital converter (ADC). ADS1261 is a low-drift, 24-bit, 40-kSPS, 10-channel delta-sigma (ΔΣ) ADC with an integrated PGA, voltage reference, and internal fault monitors. This sensor-ready ADC provides (...)

Features
  • Includes all required support circuitry for ADS1261
  • 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

Software development

APPLICATION SOFTWARE & FRAMEWORK Download
Temperature-sensor (RTD, thermocouple, thermistor) firmware for precision ADCs
ADC-TEMP-SENSOR-FW This temperature-sensor linearization firmware provides a software routine for measuring and linearizing most common temperature sensors, including resistance temperature detectors (RTDs), thermocouples, thermistors (NTC, PTC, etc.), and analog temperature sensors.

This software includes an (...)

Features
  • Complete firmware for temperature-to-digital conversion
  • Supports common temperature-sensor types:
    • RTDs (PT100, PT1000, Ni120, etc.)
    • Thermocouples (type K, J, B, T, etc.)
    • Thermistors (PTC, NTC)
    • Analog temperature sensors
  • Easy to modify for multiple sensors
  • Use with other precision ADCs with minimal design (...)
SUPPORT SOFTWARE Download
SBAC200B.ZIP (1970 KB)

Design tools & simulation

SIMULATION MODEL Download
SBAM402.ZIP (46 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
  • (...)
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
ADS1261 design calculator
ADS1261-EXCEL-CALC-TOOL The ADS1261 Excel™ calculator tool provides the user with several easy-to-use tools to simplify the configuration of the ADS1260 and ADS1261. To ensure proper device functionality, the tool includes a common-mode-range calculator to easily determine if the input, supply voltage, and gain (...)
Features
  • PGA common-mode-range calculator
  • Analog-to-digital converter (ADC) code-conversion calculator
  • Digital filter plot + settling time + normal-mode rejection
  • CRC calculator
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
  • (...)

Reference designs

REFERENCE DESIGNS Download
HART-enabled PLC analog input module reference design
TIDA-060020 — This reference design is a single-channel, 4-mA to 20-mA analog input module that supports the highway addressable remote transducer (HART) communication protocol, enabling bidirectional digital communication between field transmitters and programmable logic controllers (PLCs). The loop current (...)
document-generic Schematic

CAD/CAE symbols

Package Pins Download
VQFN (RHB) 32 View options

Ordering & quality

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  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

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Support & training

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