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ADS7042

ACTIVE

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

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Data sheet

ADS7042

ACTIVE
Data sheet Order now

Product details

Resolution (Bits) 12 Sample rate (max) (ksps) 1000 Number of input channels 1 Interface type SPI Architecture SAR Input type Single-ended Rating Catalog Reference mode Supply Input voltage range (max) (V) 3.6 Input voltage range (min) (V) 0 Features Small Size Operating temperature range (°C) -40 to 125 Power consumption (typ) (mW) 0.234 Analog supply voltage (min) (V) 1.65 Analog supply voltage (max) (V) 3.6 SNR (dB) 70 Digital supply (min) (V) 1.65 Digital supply (max) (V) 3.6
Resolution (Bits) 12 Sample rate (max) (ksps) 1000 Number of input channels 1 Interface type SPI Architecture SAR Input type Single-ended Rating Catalog Reference mode Supply Input voltage range (max) (V) 3.6 Input voltage range (min) (V) 0 Features Small Size Operating temperature range (°C) -40 to 125 Power consumption (typ) (mW) 0.234 Analog supply voltage (min) (V) 1.65 Analog supply voltage (max) (V) 3.6 SNR (dB) 70 Digital supply (min) (V) 1.65 Digital supply (max) (V) 3.6
VSSOP (DCU) 8 6.2 mm² 2 x 3.1 X2QFN (RUG) 8 2.25 mm² 1.5 x 1.5
  • 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
  • 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

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.

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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* Data sheet ADS7042 Ultra-Low Power, Ultra-Small Size, 12-Bit, 1-MSPS, SAR ADC datasheet (Rev. C) PDF | HTML 10 Dec 2015
Application brief Precision ADCs in Servo Drives (Rev. A) PDF | HTML 29 Oct 2025
Product overview Precision ADCs for Motor Encoders and Position Sensing (Rev. A) PDF | HTML 28 Oct 2025
Analog Design Journal Low-power sensor measurements: 3.3-V, 1-ksps, 12-bit, single-ended, single-suppl (Rev. B) PDF | HTML 26 Sep 2024
Circuit design Driving a SAR ADC directly without a front-end buffer circuit (Rev. B) PDF | HTML 23 Sep 2024
Circuit design High-side current shunt monitor circuit to 3-V single-ended ADC (Rev. A) PDF | HTML 20 Sep 2024
Circuit design Low-power sensor measurements: 3.3-V, 1-ksps, 12-bit, single-ended, dual-supply (Rev. B) PDF | HTML 17 Sep 2024
Technical article Accurately measure vital signs with low Iq and a small form factor (Rev. B) PDF | HTML 18 Apr 2024
Technical article How tiny data converters give you more value per square PDF | HTML 11 Dec 2019
Circuit design Monitoring NTC Thermistor Circuit With Single-Ended ADC (Rev. A) PDF | HTML 27 Jun 2019
Application brief Optimized Sensor Measurement: Driving a SAR ADC Input Without a Driver Amplifier 01 Sep 2017
Application note Low-Cost, Low-Power, Small 14-bit AFE: Interleaved ADCs Scalable up to 7.5 MSPS 26 May 2017
User guide BOOST-ADS7042 BoosterPack™ Plug-In Module 08 Jun 2016
User guide BOOST-ADS7042 Getting Started Guide 21 Apr 2016
User guide BOOST-ADS7042 Quick Start Guide 16 Mar 2016
More literature SAR ADCs for PLC Applications 11 Feb 2016
Design guide Software Pacemaker Detection Design Guide 03 Dec 2015
E-book Best of Baker's Best: Precision Data Converters -- SAR ADCs 21 May 2015

Design & development

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

Evaluation board

ADS7042EVM-PDK — ADS7042 Ultra-Low-Power Ultra-Small-Size 12-Bit 1MSPS SAR ADC Performance Demonstration Kit (PDK)

The ADS7042 evaluation module (EVM) performance demonstration kit (PDK) is a platform for evaluating the 12-bit, ADS7042 successive approximation register (SAR) analog-to-digital converter (ADC).

The PDK includes the ADS7042 evaluation board, precision host interface (PHI) controller board, and (...)

User guide: PDF | HTML
Not available on TI.com
Evaluation board

BOOST-ADS7042 — ADS7042 Ultra-Low Power Data Acquisition BoosterPack

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 (...)

User guide: PDF
Not available on TI.com
Evaluation board

PLABS-SAR-EVM-PDK — TI Precision Labs SAR ADC Evaluation Module Performance Demonstration Kit (PDK)

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 (...)

User guide: PDF
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Support software

SBAC178 — Source Files for SBAA256

Supported products & hardware

Supported products & hardware
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Support software

SBAC230 — Source files for SBAA340

Supported products & hardware

Supported products & hardware
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Simulation model

ADS7042 IBIS Model

SBAM196.ZIP (26 KB) - IBIS Model
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Simulation model

ADS7042 TINA-TI Transient Spice Model

SBAM195.ZIP (83 KB) - TINA-TI Spice Model
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Simulation model

Low Power Sensor Measurements: 3.3V, 1 kSPS, Tina Files (Rev. A)

SBAM341A.ZIP (48 KB) - TINA-TI Spice Model
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Simulation model

Low-Power Sensor Measurements Dual Supply Tina File

SBAM342.ZIP (49 KB) - TINA-TI Spice Model
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Calculation tool

ANALOG-ENGINEER-CALC — PC software analog engineer's calculator

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 operational-amplifier (...)

Supported products & hardware

Supported products & hardware
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Design tool

ADC-DAC-TO-VREF-SELECT-DESIGN-TOOL — The ADC-TO-VREF-SELECT tool enables the pairing of TI ADCs, DACs, and series voltage references.

The ADC-TO-VREF-SELECT tool enables the pairing of TI analog-to-digital converters (ADCs) and series voltage references. Users can select an ADC device and the desired reference voltage, and the tool will list up to two voltage reference recommendations.
Supported products & hardware

Supported products & hardware
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Schematic

TIPD197 Design File

TIDCAP1.ZIP (795 KB)
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
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Simulation tool

TINA-TI — SPICE-based analog simulation program

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 (...)
User guide: PDF
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Reference designs

TIPD197 — Reference Design for Software Pacemaker Detection in an ECG

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.
Design guide: PDF
Schematic: PDF
Reference designs

TIPD168 — Three 12-Bit Data Acquisition Reference Designs Optimized for Low Power and Ultra-Small Form Factor

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: 

(...)

User guide: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
VSSOP (DCU) 8 Ultra Librarian
X2QFN (RUG) 8 Ultra Librarian
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