SBAS608C June 2014  – December 2015 ADS7042

PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Companion Products
  6. Device Comparison
  7. Pin Configuration and Functions
  8. Specifications
    1. 8.1Absolute Maximum Ratings
    2. 8.2ESD Ratings
    3. 8.3Recommended Operating Conditions
    4. 8.4Thermal Information
    5. 8.5Electrical Characteristics
    6. 8.6Timing Characteristics
    7. 8.7Typical Characteristics
  9. Parameter Measurement Information
    1. 9.1Digital Voltage Levels
  10. 10Detailed Description
    1. 10.1Overview
    2. 10.2Functional Block Diagram
    3. 10.3Feature Description
      1. 10.3.1Reference
      2. 10.3.2Analog Input
      3. 10.3.3ADC Transfer Function
      4. 10.3.4Serial Interface
    4. 10.4Device Functional Modes
      1. 10.4.1Offset Calibration
        1. 10.4.1.1Offset Calibration on Power-Up
        2. 10.4.1.2Offset Calibration During Normal Operation
  11. 11Application and Implementation
    1. 11.1Application Information
    2. 11.2Typical Applications
      1. 11.2.1Single-Supply DAQ with the ADS7042
        1. 11.2.1.1Design Requirements
        2. 11.2.1.2Detailed Design Procedure
          1. 11.2.1.2.1Antialiasing Filter
          2. 11.2.1.2.2Input Amplifier Selection
          3. 11.2.1.2.3Reference Circuit
        3. 11.2.1.3Application Curve
      2. 11.2.2DAQ Circuit with the ADS7042 for Maximum SINAD
        1. 11.2.2.1Design Requirements
        2. 11.2.2.2Detailed Design Procedure
        3. 11.2.2.3Application Curves
      3. 11.2.312-Bit, 10-kSPS DAQ Circuit Optimized for DC Sensor Measurements
        1. 11.2.3.1Design Requirements
        2. 11.2.3.2Detailed Design Procedure
        3. 11.2.3.3Application Curve
  12. 12Power-Supply Recommendations
    1. 12.1AVDD and DVDD Supply Recommendations
    2. 12.2Estimating Digital Power Consumption
    3. 12.3Optimizing Power Consumed by the Device
  13. 13Layout
    1. 13.1Layout Guidelines
    2. 13.2Layout Example
  14. 14Device and Documentation Support
    1. 14.1Documentation Support
      1. 14.1.1Related Documentation
    2. 14.2Community Resources
    3. 14.3Trademarks
    4. 14.4Electrostatic Discharge Caution
    5. 14.5Glossary
  15. 15Mechanical, Packaging, and Orderable Information

1 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

2 Applications

  • Low-Power Data Acquisition
  • Battery-Powered Handheld Equipment
  • Level Sensors
  • Ultrasonic Flow Meters
  • Motor Control
  • Wearable Fitness
  • Portable Medical Equipment
  • Hard Drives
  • Glucose Meters

3 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 a 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.

Device Information(1)

PART NAMEPACKAGEBODY SIZE (NOM)
ADS7042X2QFN (8)1.50 mm × 1.50 mm
VSSOP (8)2.30 mm × 2.00 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

Typical Application

ADS7042 alt_sbas608.gif
NOTE: The ADS7042 is smaller than a 0805 (2012 metric) SMD component.