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ADS1120

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16-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC with PGA, VREF, 2x IDACs & SPI interface

Data sheet
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16-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC with PGA, VREF, 2x IDACs & SPI interface

ADS1120

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Product details

Parameters

Resolution (Bits) 16 Number of input channels 4 Sample rate (Max) (kSPS) 2 Interface type SPI Architecture Delta-Sigma Input type Differential, Single-Ended Multi-channel configuration Multiplexed Rating Catalog Reference mode Ext, Int, Supply Input range (Max) (V) 2.85 , 5.6 Input range (Min) (V) -2.85, 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) 1.4 Analog voltage AVDD (Min) (V) 2.3 Analog voltage AVDD (Max) (V) 5.5 INL (Max) (+/-LSB) 1.3 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 VQFN (RVA) 16 12 mm² 3.5 x 3.5 open-in-new Find other Precision ADCs (<=10MSPS)

Features

  • Low Current Consumption:
    As Low as 120 µA (typ) in Duty-Cycle Mode
  • Wide Supply Range: 2.3 V to 5.5 V
  • Programmable Gain: 1 V/V to 128 V/V
  • Programmable Data Rates: Up to 2 kSPS
  • 16-Bit Noise-Free Resolution at 20 SPS
  • 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:
    50 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
  • SPI-Compatible Interface (Mode 1)
  • Package: 3.5-mm × 3.5-mm × 0.9-mm VQFN
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Description

The ADS1120 is a precision, 16-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, a low-side switch, 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 V/V. This PGA makes the ADS1120 ideally-suited for applications measuring small sensor signals, such as resistance temperature detectors (RTDs), thermocouples, thermistors, and bridge sensors. The device supports measurements of pseudo- or fully-differential signals when using the PGA. Alternatively, the device can be configured to bypass the internal PGA while still providing high input impedance and gains up to 4 V/V, allowing for single-ended measurements.

Power consumption is as low as 120 µA when operating in duty-cycle mode with the PGA disabled. The ADS1120 is offered in a leadless VQFN-16 or a TSSOP-16 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 ADS1120 4-Channel, 2-kSPS, Low-Power, 16-Bit ADC with Integrated PGA and Reference datasheet (Rev. C) Feb. 20, 2017
Application note ADS124S08 3-Wire PT100 RTD Measurement Circuit w/ Low-Side Reference and 1 IDAC (Rev. B) Sep. 09, 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 QFN and SON PCB Attachment (Rev. B) Aug. 24, 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
Application note How delta-sigma ADCs work, Part 1 (Rev. A) Sep. 19, 2016
E-book Best of Baker's Best: Precision Data Converters -- Delta-Sigma ADCs Mar. 19, 2015
User guide ADS1x20EVM User's Guide Jul. 12, 2013
Application note RTD Ratiometric Measurements and Filtering Using the ADS1148 and ADS1248 Mar. 13, 2013
Application note How delta-sigma ADCs work, Part 2 Nov. 09, 2011

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 ADS1120 evaluation module (EVM) is an evaluation system for the ADS1120, a 16-bit, multichannel, delta-sigma analog-to-digital converter (ADC). The EVM uses the ADS1120 along with minimal circuitry to demonstrate functionality for prototyping and part evaluation. The pins of the ADS1120 are (...)

Features
  • Contains all support circuitry needed for ADS1120
  • 5-V or 3.3-V power-supply options for ADC
  • Voltage reference options: external or onboard
  • Easy-to-use evaluation software for Microsoft® Windows™ XP and Windows 7
  • Built-in analysis tools including scope, FFT, and histogram displays
  • Data collection to text (...)
View details

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 (...)
View details
SUPPORT SOFTWARE Download
SBAC227.ZIP (51 KB)

Design tools & simulation

SIMULATION MODEL Download
SBAM171A.ZIP (82 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
RTD Temperature Transmitter for 2-wire, 4 to 20-mA Current Loop Systems
TIDA-00095 — This comprehensive design provides a complete system that measures and processes temperature signals  inputs from 2-wire, 3-wire, and 4-wire resistance temperature detectors (RTDs) and outputs a 4 to 20-mA current-loop signal corresponding to the temperature processed from the RTD inputs. It is (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
4- to 20-mA Loop-Powered RTD Temperature Transmitter Reference Design With MSP430 Smart Analog Combo
TIDM-01000 — This TI reference design provides a low-component count, low-cost solution for 4- to 20-mA loop-powered, resistance-temperature detector (RTD), temperature transmitter. The design takes advantage of the on-chip Smart Analog Combo module in the MSP430FR2355 MCU to control the loop current, so  (...)
document-generic Schematic
REFERENCE DESIGNS Download
Wireless pH Sensor Transmitter (DevPack for SensorTag) Reference Design
TIDA-00561 — TIDA-00561 shows how to build an industrial-grade wireless pH transmitter for process control. This reference design includes a designed pH front-end which can be connected directly via its onboard connector to most pH probes used in process control. The performance data was tested and characterized (...)
document-generic Schematic

CAD/CAE symbols

Package Pins Download
TSSOP (PW) 16 View options
VQFN (RVA) 16 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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