SBAS608C June   2014  – December 2015 ADS7042

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Companion Products
  6. 6 Device Comparison
  7. 7 Pin Configuration and Functions
  8. 8 Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics
    6. 8.6 Timing Characteristics
    7. 8.7 Typical Characteristics
  9. 9 Parameter Measurement Information
    1. 9.1 Digital Voltage Levels
  10. 10Detailed Description
    1. 10.1 Overview
    2. 10.2 Functional Block Diagram
    3. 10.3 Feature Description
      1. 10.3.1 Reference
      2. 10.3.2 Analog Input
      3. 10.3.3 ADC Transfer Function
      4. 10.3.4 Serial Interface
    4. 10.4 Device Functional Modes
      1. 10.4.1 Offset Calibration
        1. 10.4.1.1 Offset Calibration on Power-Up
        2. 10.4.1.2 Offset Calibration During Normal Operation
  11. 11Application and Implementation
    1. 11.1 Application Information
    2. 11.2 Typical Applications
      1. 11.2.1 Single-Supply DAQ with the ADS7042
        1. 11.2.1.1 Design Requirements
        2. 11.2.1.2 Detailed Design Procedure
          1. 11.2.1.2.1 Antialiasing Filter
          2. 11.2.1.2.2 Input Amplifier Selection
          3. 11.2.1.2.3 Reference Circuit
        3. 11.2.1.3 Application Curve
      2. 11.2.2 DAQ Circuit with the ADS7042 for Maximum SINAD
        1. 11.2.2.1 Design Requirements
        2. 11.2.2.2 Detailed Design Procedure
        3. 11.2.2.3 Application Curves
      3. 11.2.3 12-Bit, 10-kSPS DAQ Circuit Optimized for DC Sensor Measurements
        1. 11.2.3.1 Design Requirements
        2. 11.2.3.2 Detailed Design Procedure
        3. 11.2.3.3 Application Curve
  12. 12Power-Supply Recommendations
    1. 12.1 AVDD and DVDD Supply Recommendations
    2. 12.2 Estimating Digital Power Consumption
    3. 12.3 Optimizing Power Consumed by the Device
  13. 13Layout
    1. 13.1 Layout Guidelines
    2. 13.2 Layout Example
  14. 14Device and Documentation Support
    1. 14.1 Documentation Support
      1. 14.1.1 Related Documentation
    2. 14.2 Community Resources
    3. 14.3 Trademarks
    4. 14.4 Electrostatic Discharge Caution
    5. 14.5 Glossary
  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 NAME PACKAGE BODY SIZE (NOM)
ADS7042 X2QFN (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.