SBAS682D November   2014  – December 2015 ADS7044

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Timing Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Parameter Measurement Information
    1. 7.1 Digital Voltage Levels
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Reference
      2. 8.3.2 Analog Input
      3. 8.3.3 ADC Transfer Function
      4. 8.3.4 Serial Interface
    4. 8.4 Device Functional Modes
      1. 8.4.1 Offset Calibration
        1. 8.4.1.1 Offset Calibration on Power-Up
        2. 8.4.1.2 Offset Calibration During Normal Operation
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Single-Supply DAQ with the ADS7044
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Antialiasing Filter
          2. 9.2.1.2.2 Input Amplifier Selection
          3. 9.2.1.2.3 Reference Circuit
        3. 9.2.1.3 Application Curve
      2. 9.2.2 Ultra-Low Power and Ultra-Small, High CMRR DAQ Circuit with the ADS7044
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
        3. 9.2.2.3 Application Curves
  10. 10Power-Supply Recommendations
    1. 10.1 AVDD and DVDD Supply Recommendations
    2. 10.2 Estimating Digital Power Consumption
    3. 10.3 Optimizing Power Consumed by the Device
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Community Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • DCU|8
  • RUG|8
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • Industry's First SAR ADC with Nanowatt Power Consumption:
    • 261 µW at 1 MSPS with 1.8-V AVDD
    • 900 µW at 1 MSPS with 3-V AVDD
    • 90 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
    • 71-dB SNR with 3-V AVDD
    • –85-dB THD with 3-V AVDD
  • Unipolar, Differential Input Range:
    –AVDD 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 Controls
  • Wearable Fitness
  • Portable Medical Equipment
  • Hard Drives
  • Glucose Meters

3 Description

The ADS7044 is a 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 device complies with the JESD8-7A standard for normal DVDD range (1.65 V to 1.95 V).

The device 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)
ADS7044 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.

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Typical Application

ADS7044 dev_fp_sbas682.gif
NOTE: The device is smaller than a 0805 (2012 metric) SMD component.