ADS7042

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12-Bit 1MSPS Ultra-Low-Power Ultra-Small-Size SAR ADC With SPI Interface

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Product details

Parameters

Resolution (Bits) 12 Number of input channels 1 Sample rate (Max) (kSPS) 1000 Interface SPI Architecture SAR Input type Single-Ended Multi-channel configuration Rating Catalog Reference mode Supply Input range (Max) (V) 3.6 Input range (Min) (V) 0 Features Small Size Operating temperature range (C) -40 to 125 Power consumption (Typ) (mW) 0.234 Analog voltage AVDD (Min) (V) 1.65 SNR (dB) 70 Analog voltage AVDD (Max) (V) 3.6 INL (Max) (+/-LSB) 1 Digital supply (Min) (V) 1.65 Digital supply (Max) (V) 3.6 Approx. price (US$) 0.87 | 1ku open-in-new Find other Precision ADCs (<=10MSPS)

Package | Pins | Size

VSSOP (DCU) 8 6 mm² 2 x 3.1 X2QFN (RUG) 8 2 mm² 1.5 x 1.5 open-in-new Find other Precision ADCs (<=10MSPS)

Features

  • Industry’s First SAR ADC with Nanowatt Power Consumption:
    • 234 µW at 1 MSPS with 1.8-V AVDD
    • 690 µW at 1 MSPS with 3-V AVDD
    • 69 µW at 100 kSPS with 3-V AVDD
    • Less than 1 µW at 1 kSPS with 3-V AVDD
  • Industry’s Smallest SAR ADC:
    • X2QFN-8 Package with 2.25-mm2 Footprint
  • 1-MSPS Throughput with Zero Data Latency
  • Wide Operating Range:
    • AVDD: 1.65 V to 3.6 V
    • DVDD: 1.65 V to 3.6 V (Independent of AVDD)
    • Temperature Range: –40°C to 125°C
  • Excellent Performance:
    • 12-Bit Resolution with NMC
    • ±1-LSB (Max) DNL and INL
    • 70-dB SNR with 3-V AVDD
    • –80-dB THD with 3-V AVDD
  • Unipolar Input Range: 0 V to AVDD
  • Integrated Offset Calibration
  • SPI™-Compatible Serial Interface: 16 MHz
  • JESD8-7A Compliant Digital I/O
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Description

The ADS7042 is a 12-bit, 1-MSPS, analog-to-digital converter (ADC). The device supports a wide analog input voltage range (1.65 V to 3.6 V) and includes a capacitor-based, successive-approximation register (SAR) ADC with an inherent sample-and-hold circuit. The SPI-compatible serial interface is controlled by the CS and SCLK signals. The input signal is sampled with the CS falling edge and SCLK is used for conversion and serial data output. The device supports a wide digital supply range (1.65 V to 3.6 V), enabling direct interface to a variety of host controllers. The ADS7042 complies with the JESD8-7A standard for normal DVDD range (1.65 V to 1.95 V).

The ADS7042 is available in 8-pin, miniature, leaded, and X2QFN packages and is specified for operation from –40°C to 125°C. Miniature form-factor and extremely low-power consumption make this device suitable for space-constrained, battery-powered applications.

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Technical documentation

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No results found. Please clear your search and try again. View all 20
Type Title Date
* Datasheet ADS7042 Ultra-Low Power, Ultra-Small Size, 12-Bit, 1-MSPS, SAR ADC datasheet (Rev. C) Dec. 10, 2015
Technical articles How tiny data converters give you more value per square Dec. 11, 2019
Application notes Monitoring NTC thermistor circuit with single-ended ADC Mar. 12, 2019
Application notes Driving a SAR ADC directly without a front-end buffer circuit (Rev. A) Mar. 06, 2019
Application notes Low-power sensor measurements: 3.3-V, 1-ksps, 12-bit, single-ended, dual-supply (Rev. A) Mar. 06, 2019
Application notes Low-power sensor measurements: 3.3-V, 1-ksps, 12-bit, single-ended, single-suppl (Rev. A) Mar. 06, 2019
Selection guides Precision Data Converter Companion Devices Selection Guide (Rev. B) Oct. 04, 2018
Technical articles Accurately measure vital signs with low Iq and a small form factor Mar. 28, 2018
Application notes High-side current shunt monitor circuit to 3-V single-ended ADC Jan. 06, 2018
Application notes Optimized Sensor Measurement: Driving a SAR ADC Input Without a Driver Amplifier Sep. 01, 2017
Application notes Low-Cost, Low-Power, Small 14-bit AFE: Interleaved ADCs Scalable up to 7.5 MSPS May 26, 2017
User guides BOOST-ADS7042 BoosterPack™ Plug-In Module Jun. 08, 2016
Technical articles How low can you go? How to reduce power consumption in data-acquisition systems May 27, 2016
User guides BOOST-ADS7042 Getting Started Guide Apr. 21, 2016
User guides BOOST-ADS7042 Quick Start Guide Mar. 16, 2016
More literature SAR ADCs for PLC Applications Feb. 11, 2016
User guides Software Pacemaker Detection Design Guide Dec. 03, 2015
More literature Best of Baker's Best: Precision Data Converters -- SAR ADCs May 21, 2015
Technical articles SAR ADC response times: Interface topology makes a difference (Part 1) Jan. 16, 2015
User guides ADS7042EVM-PDK User's Guide (Rev. A) Nov. 13, 2014

Design & development

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

Hardware development

EVALUATION BOARDS Download
Description

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 (...)

EVALUATION BOARDS Download
document-generic User guide
$199.00
Description

The ADS7042EVM-PDK is a platform for evaluation of the ADS7042 analog to Digital converter (ADC). The converter is an 12 bit single-ended Successive Approximation-Register (SAR) ADC with a maximum throughput of 1MSPS. The evaluation kit combines the ADS7042EVM board with a serial data capture card (...)

Features
  • Contains support circuitry as a design example to match ADC performance
  • 3.3-V slave serial peripheral interface (SPI)
  • Onboard 5-V analog supply
  • Onboard OPA835 (56-MHz bandwidth, Rail-to-Rail Out) ADC input drivers
  • USB port for computer interface
EVALUATION BOARDS Download
document-generic User guide
Description

The ADS7042 Ultra-Low Power Data Acquisition BoosterPack is a stand-alone system that converts analog sensor data into digital SPI data using the TI ADS7042 Successive Approximation Register Analog-to-Digital Converter.  This BoosterPack has been designed to be compatible with the TI (...)

Features
  • Designed using the ADS7042 precision analog-to-digital converter, OPA316 precision ADC driver, and REF3330 precision voltage reference
  • Nanowatt power consumption of the ADS7042 ADC when sampling at 1 KSPS
  • ADC sampling rates betwen 1 KSPS and 1 MSPS
  • SMA jack for optional external analog signal input
  • (...)
EVALUATION BOARDS Download
document-generic User guide
$499.00
Description

PLABS-SAR-EVM-PDK is an experimental platform used in conjunction with TI Precision Labs videos to gain a deeper understanding of successive approximation register (SAR) analog-to-digital converter (ADC) circuits. The evaluation module (EVM) platform contains two channels for common SAR (...)

Features
  • Intuitive setup – PCB overlay shows the schematic
  • No external power supply required
  • Includes several coupon boards with different driving amplifier RC filters to facilitate experimentation
  • Ships with PHI controller - provides convenient interface to EVM over USB 2.0 (or higher) for power delivery (...)

Software development

SUPPORT SOFTWARE Download
SBAC178.ZIP (3 KB)
SUPPORT SOFTWARE Download
SBAC230.ZIP (44 KB)
SUPPORT SOFTWARE Download
SLAC673A.ZIP (171067 KB)

Design tools & simulation

SIMULATION MODELS Download
SBAM195.ZIP (83 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SBAM196.ZIP (26 KB) - IBIS Model
SIMULATION MODELS Download
SBAM341A.ZIP (48 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SBAM342.ZIP (49 KB) - TINA-TI Spice Model
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 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
  • (...)
SCHEMATICS Download
TIDCAP1.ZIP (795 KB)

Reference designs

REFERENCE DESIGNS Download
Reference Design for Software Pacemaker Detection in an ECG
TIPD197 This circuit is designed to condition and digitize an electrocardiogram signal output from the integrated PACE_OUT buffer on the ADS129x to detect artifacts of an artificial pacemaker. This circuit includes an op amp which serves as a signal conditioner and input driver for a fast-sampling SAR ADC.
document-generic Schematic document-generic User guide
Design files
REFERENCE DESIGNS Download
Three 12-Bit Data Acquisition Reference Designs Optimized for Low Power and Ultra-Small Form Factor
TIPD168 This Verified Precision Design details the design procedure, simulated results, and showcases the actual performance of a 12-bit discrete data acquisition block using the ADS7042, optimized for extremely low power, small form factor applications for the following three different optimizations: 

(...)

document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
VSSOP (DCU) 8 View options
X2QFN (RUG) 8 View options

Ordering & quality

Support & training

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