SBAS891B November   2017  – September 2022 ADS7142-Q1

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: All Modes
    6. 6.6  Electrical Characteristics: Manual Mode
    7. 6.7  Electrical Characteristics: Autonomous Modes
    8. 6.8  Electrical Characteristics: High Precision Mode
    9. 6.9  Timing Requirements
    10. 6.10 Switching Characteristics
    11. 6.11 Timing Diagrams
    12. 6.12 Typical Characteristics: All Modes
    13. 6.13 Typical Characteristics: Manual Mode
    14. 6.14 Typical Characteristics: Autonomous Modes
    15. 6.15 Typical Characteristics: High-Precision Mode
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Analog Input and Multiplexer
        1. 7.3.1.1 Two-Channel, Single-Ended Configuration
        2. 7.3.1.2 Single-Channel, Single-Ended Configuration With Remote Ground Sense
        3. 7.3.1.3 Single-Channel, Pseudo-Differential Configuration
      2. 7.3.2  Offset Calibration
      3. 7.3.3  Reference
      4. 7.3.4  ADC Transfer Function
      5. 7.3.5  Oscillator and Timing Control
      6. 7.3.6  I2C Address Selector
      7. 7.3.7  Data Buffer
        1. 7.3.7.1 Filling of the Data Buffer
        2. 7.3.7.2 Reading Data From the Data Buffer
      8. 7.3.8  Accumulator
      9. 7.3.9  Digital Window Comparator
      10. 7.3.10 I2C Protocol Features
        1. 7.3.10.1 General Call
        2. 7.3.10.2 General Call With Software Reset
        3. 7.3.10.3 General Call With Write Software Programmable Part of the Target Address
        4. 7.3.10.4 Configuring the ADC Into High-Speed I2C Mode
        5. 7.3.10.5 Bus Clear
    4. 7.4 Device Functional Modes
      1. 7.4.1 Device Power Up and Reset
      2. 7.4.2 Manual Mode
        1. 7.4.2.1 Manual Mode With CH0 Only
        2. 7.4.2.2 Manual Mode With AUTO Sequence
      3. 7.4.3 Autonomous Modes
        1. 7.4.3.1 Autonomous Mode With Threshold Monitoring and Diagnostics
          1. 7.4.3.1.1 Autonomous Mode With Pre-ALERT Data
          2. 7.4.3.1.2 Autonomous Mode With Post-ALERT Data
        2. 7.4.3.2 Autonomous Mode With Burst Data
          1. 7.4.3.2.1 Autonomous Mode With Start Burst
          2. 7.4.3.2.2 Autonomous Mode With Stop Burst
      4. 7.4.4 High-Precision Mode
    5. 7.5 Programming
      1. 7.5.1 Reading Registers
        1. 7.5.1.1 Single Register Read
        2. 7.5.1.2 Reading a Continuous Block of Registers
      2. 7.5.2 Writing Registers
        1. 7.5.2.1 Single Register Write
        2. 7.5.2.2 Writing a Continuous Block of Registers
        3. 7.5.2.3 Set Bit
        4. 7.5.2.4 Clear Bit
    6. 7.6 Register Map
      1. 7.6.1 Page1 Registers
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 ADS7142-Q1 as a Programmable Comparator With False Trigger Prevention and Diagnostics
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Programmable Thresholds and Hysteresis
          2. 8.2.1.2.2 False Trigger Prevention With an Event Counter
          3. 8.2.1.2.3 Fault Diagnostics With the Data Buffer
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Voltage and Temperature Monitoring in Remote Camera Modules Using the ADS7142-Q1
        1. 8.2.2.1 Design Requirements
    3. 8.3 Power Supply Recommendations
      1. 8.3.1 AVDD and DVDD Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  9. 9 Device and Documentation Support
    1. 9.1 Electrostatic Discharge Caution
    2. 9.2 Glossary
    3. 9.3 Trademarks
    4. 9.4 Receiving Notification of Documentation Updates
    5. 9.5 Support Resources
  10. 10Mechanical, Packaging, and Orderable Information

6.13 Typical Characteristics: Manual Mode

at TA = 25°C, AVDD = 3 V, DVDD = 3.3 V, and two-channel single-ended configuration (unless otherwise noted)

GUID-E9EFAF69-5575-4893-92D4-D0C6D892EF5A-low.gif
SNR = 69.6 dB, THD = –84 dB, ENOB = 11.2,
fsample = 140 kSPS, SFDR = 87 dB, AVDD = 1.8 V
Figure 6-5 Typical FFT in Manual Mode
GUID-029D9CF6-E90E-4D4A-8E3E-ABAF0D6919C7-low.gif
fsample = 140 kSPS
Figure 6-7 SNR and SINAD in Manual Mode vs Temperature
GUID-F81D625D-BD6C-4500-AB91-E504E30742E1-low.gif
fsample = 140 kSPS
Figure 6-9 THD in Manual Mode vs Temperature
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fsample = 140 kSPS
Figure 6-11 THD in Manual Mode vs AVDD
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Figure 6-13 Offset Error in Manual Mode vs Temperature
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Figure 6-15 Gain Error in Manual Mode vs Free-Air Temperature
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AVDD = 3 V
Figure 6-17 Typical DNL in Manual Mode
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AVDD = 3 V
Figure 6-19 Typical INL in Manual Mode
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Figure 6-21 DNL in Manual Mode vs Temperature
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Figure 6-23 INL in Manual Mode vs Temperature
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fSample = 140 kSPS, SCL = 3.4 MHz
Figure 6-25 IAVDD in Manual Mode vs AVDD
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DVDD = 1.8 V
Figure 6-27 IDVDD in Manual Mode vs SCL
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SNR = 71.3 dB, THD = –87 dB, ENOB = 11.5,
fsample = 140 kSPS, SFDR = 89.3 dB, AVDD = 3 V
Figure 6-6 Typical FFT in Manual Mode
GUID-FD493EDB-9039-4173-B76A-FEA09BF39C4C-low.gif
fsample = 140 kSPS
Figure 6-8 SNR and SINAD in Manual Mode vs AVDD
GUID-BB44A741-E5D8-471E-A903-6E791F4D8ED1-low.gif
fsample = 140 kSPS
Figure 6-10 SFDR in Manual Mode vs Temperature
GUID-118FAE6F-908F-4DF3-BA81-0E3F7A85FDDC-low.gif
Mean code = 2047.9, standard deviation = 0.32
Figure 6-12 Typical DC Code Spread in Manual Mode
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Figure 6-14 Offset Error in Manual Mode vs AVDD
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Figure 6-16 Gain Error in Manual Mode vs AVDD
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AVDD = 1.8 V
Figure 6-18 Typical DNL in Manual Mode
GUID-3F43B732-141F-46ED-8BAF-A77128DC188E-low.gif
AVDD = 1.8 V
Figure 6-20 Typical INL in Manual Mode
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Figure 6-22 DNL in Manual Mode vs AVDD
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Figure 6-24 INL in Manual Mode vs AVDD
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Figure 6-26 IAVDD in Manual Mode vs Temperature
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No activity on SCL and SDA
Figure 6-28 Static IAVDD in Manual Mode vs Temperature