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Product details

Parameters

Resolution (Bits) 16 Number of input channels 8 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 Input range (Max) (V) 2.125, 4.25 Input range (Min) (V) -2.125, 0 Features 50/60 Hz Rejection, Excitation Current Sources (iDACs), GPIO, Oscillator, PGA, Temp Sensor Operating temperature range (C) -40 to 105 Power consumption (Typ) (mW) 2.3 Analog voltage AVDD (Min) (V) 2.7 Analog voltage AVDD (Max) (V) 5.25 INL (Max) (+/-LSB) 1 Digital supply (Min) (V) 2.7 Digital supply (Max) (V) 5.25 open-in-new Find other Precision ADCs (<=10MSPS)

Package | Pins | Size

TSSOP (PW) 28 62 mm² 9.7 x 6.4 VQFN (RHB) 32 25 mm² 5 x 5 open-in-new Find other Precision ADCs (<=10MSPS)

Features

  • Programmable Data Rates Up to 2 kSPS
  • Single-Cycle Settling for All Data Rates
  • Simultaneous 50-Hz and 60-Hz Rejection at
    20 SPS
  • Analog Multiplexer With 8 (ADS1148) and
    4 (ADS1147) Independently Selectable Inputs
  • Programmable Gain: 1 V/V to 128 V/V
  • Dual-Matched Programmable Excitation Current Sources
  • Low-Drift Internal 2.048-V Reference
  • Sensor Burnout Detection
  • 4 or 8 General-Purpose I/Os (ADS1147 and ADS1148)
  • Internal Temperature Sensor
  • Power Supply and VREF Monitoring (ADS1147 and ADS1148)
  • Self and System Calibration
  • SPI™-Compatible Serial Interface
  • Analog Supply: Unipolar (2.7 V to 5.25 V) or Bipolar (±2.5 V)
  • Digital Supply: 2.7 V to 5.25 V
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Description

The ADS1146, ADS1147, and ADS1148 devices are precision, 16-bit analog-to-digital converters (ADCs) that include many integrated features to reduce system cost and component count for sensor measurement applications. The devices feature a low-noise, programmable gain amplifier (PGA), a precision delta-sigma (ΔΣ) ADC with a single-cycle settling digital filter, and an internal oscillator. The ADS1147 and ADS1148 devices also provide a built-in, low-drift voltage reference, and two matched programmable excitation current sources (IDACs).

An input multiplexer supports four differential inputs for the ADS1148, two for the ADS1147, and one for the ADS1146. In addition, the multiplexer integrates sensor burn-out detection, voltage bias for thermocouples, system monitoring, and general purpose digital I/Os (ADS1147 and ADS1148). The PGA provides selectable gains up to 128 V/V. These features provide a complete front-end solution for temperature sensor measurement applications including thermocouples, thermistors, and resistance temperature detectors (RTDs) and other small signal measurements including resistive bridge sensors. The digital filter settles in a single cycle to support fast channel cycling when using the input multiplexer and provides data rates up to 2 kSPS. For data rates of 20 SPS or less, both 50-Hz and 60-Hz interference are rejected by the filter.

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Similar but not functionally equivalent to the compared device:
ADS114S08 ACTIVE 16-bit, 4-kSPS, 12-ch delta-sigma ADC with PGA and voltage reference for sensor measurement This device has more analog inputs (12), faster sample rate (4kSPS), lower power, smaller package + better VREF drift, OSC accuracy & IDAC matching

Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet ADS114x 16-Bit, 2-kSPS, Analog-to-Digital Converters With Programmable Gain Amplifier (PGA) for Sensor Measurement datasheet (Rev. G) Aug. 11, 2016
White papers Fundamentals of Precision ADC Noise Analysis Jun. 19, 2020
Application notes ADS124S08 3-Wire PT100 RTD Measurement Circuit w/ Low-Side Reference and 1 IDAC (Rev. A) Mar. 09, 2020
Application notes K-type thermocouple measurement circuit with precision ADC Mar. 19, 2019
Application notes A Basic Guide to Thermocouple Measurements Sep. 28, 2018
Application notes QFN and SON PCB Attachment (Rev. B) Aug. 24, 2018
Application notes A Basic Guide to RTD Measurements Jun. 19, 2018
Application notes Digital Filter Types in Delta-Sigma ADCs Jun. 27, 2017
Application notes How delta-sigma ADCs work, Part 1 (Rev. A) Sep. 19, 2016
Technical articles The impact of voltage reference noise on delta-sigma ADC resolution Dec. 11, 2015
White papers Best of Baker's Best: Precision Data Converters -- Delta-Sigma ADCs Mar. 19, 2015
Application notes RTD Ratiometric Measurements and Filtering Using the ADS1148 and ADS1248 Mar. 13, 2013
Application notes How delta-sigma ADCs work, Part 2 Nov. 09, 2011
User guides ADS1148/ADS1248EVM and ADS1148/ADS1248EVM-PDK User's Guide (Rev. B) May 11, 2011

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
Description

ADCPro™ is a modular software system for evaluating analog-to-digital converters (ADCs) without the need for expensive logic analyzers and complex analysis routines. Used alone it is suitable for performing analysis on data sets captured from ADC testing; when paired with a Texas Instruments (...)

Features

ADCPro software from Texas Instruments will simplify the tasks of collecting and analyzing ADC data, and ease evaluation. With it, you can easily set up an evaluation system that may not exactly replicate the manufacturer's system, but still arrive at meaningful results that can be compared to (...)

EVALUATION BOARDS Download
document-generic User guide
Description

The ADS1148EVM-PDK is a complete evaluation/demonstration kit, which combines the ADS1148EVM with the MSP430-based MMB3 motherboard for use with a personal computer. The MMB3 motherboard allows the ADS1148EVM to connect to a computer via a USB port. The ADS1148EVM-PDK is controlled by the (...)

Features
  • 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 files
  • Complete control of board settings
  • Easily expandable with new analysis plug in tools from Texas Instruments

Software development

SUPPORT SOFTWARE Download
SBAC144.ZIP (572 KB)
SUPPORT SOFTWARE Download
SBAC243.ZIP (15574 KB)

Design tools & simulation

SIMULATION MODELS Download
SBAM010.ZIP (120 KB) - IBIS Model
SIMULATION TOOLS 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 TOOLS 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 TOOLS 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 TOOLS 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
Analog Front End (AFE) for Sensing Temperature in Smart Grid Applications Using RTD Reference Design
TIDA-00110 This reference design enables up to 4 Resistor Temperature Detectors (RTD) to be connected through one ADC in manner such that the solution is both compact and modular. Communication from the ADC to the processor is though an SPI interface. If 8 RTDs are required for an application, simply connect (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
TSSOP (PW) 28 View options
VQFN (RHB) 32 View options

Ordering & quality

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