SBASAQ6 April   2024 ADS9813

ADVANCE INFORMATION  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Timing Requirements
    7. 5.7 Switching Characteristics
    8. 5.8 Timing Diagrams
    9. 5.9 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Analog Inputs
        1. 6.3.1.1 Input Clamp Protection Circuit
        2. 6.3.1.2 Programmable Gain Amplifier (PGA)
        3. 6.3.1.3 Wide-Common-Mode Voltage Rejection Circuit
      2. 6.3.2 ADC Transfer Function
      3. 6.3.3 ADC Sampling Clock Input
      4. 6.3.4 Synchronizing Multiple ADCs
      5. 6.3.5 Reference Voltage
      6. 6.3.6 Test Patterns for Data Interface
        1. 6.3.6.1 Fixed Pattern
        2. 6.3.6.2 Digital Ramp
        3. 6.3.6.3 Alternating Test Pattern
    4. 6.4 Device Functional Modes
      1. 6.4.1 Reset
      2. 6.4.2 Power-Down
      3. 6.4.3 Initialization Sequence
      4. 6.4.4 Normal Operation
    5. 6.5 Programming
      1. 6.5.1 Register Write
      2. 6.5.2 Register Read
      3. 6.5.3 Multiple Devices in a Daisy-Chain Topology for SPI Configuration
        1. 6.5.3.1 Register Write With Daisy-Chain
        2. 6.5.3.2 Register Read With Daisy-Chain
  8. 7 Register Map
    1. 7.1 Register Bank 0
    2. 7.2 Register Bank 1
    3. 7.3 Register Bank 2
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Parametric Measurement Unit (PMU)
      2. 8.2.2 Design Requirements
      3. 8.2.3 Detailed Design Procedure
      4. 8.2.4 Application Curve
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Receiving Notification of Documentation Updates
    2. 9.2 Support Resources
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information
    1. 11.1 Mechanical Data

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6.4.3 Initialization Sequence

As shown in Table 6-7, initialize the ADS9813 with a sequence of register writes after device power-up or reset. Connect a free-running sampling clock to the ADC before executing the initialization sequence. The ADS9813 registers are initialized with the default value after the initialization sequence is complete.

Table 6-7 ADS9813 Initialization Sequence
STEP NUMBER REGISTER COMMENT
BANK ADDRESS VALUE[15:0]
1 0 0x03 0x0000 Select register bank 0
2 0 0x00 0x0004
3 0 0x04 0x000B INIT_1 configured
4 0 0x03 0x0010 Select register bank 2
5 2 0x22 0x0079 INIT_2 configured
6 2 0x23 0xE000 INIT_3 configured
7 2 0x26 0x0040 INIT_4 configured and device initialized
8 0 0x03 0x0002 Select register bank 1
9 1 0x0D 0x0080 Gain error calibration enabled

As shown in ADS9813 User-Configuration, change the default settings of the ADS9813 for the user-defined configuration. Changes to the analog inputs changes the analog input range, bandwidth, and common-mode voltage range. Changes to the data interface change the number of output lanes (either single or double data rate).

Table 6-8 ADS9813 User-Configuration
STEP REGISTER COMMENT
BANK ADDRESS VALUE[15:0]
1 1 0xC1 User defined Configure data interface and select internal or external reference
2 1 0xC2 and 0xC3 User defined Select analog input ranges, see Table 6-1
3 1 0xC0 User defined Select analog input bandwidth, see Table 6-2
4 1 0xC4 and 0xC5 User defined Select common-mode range for analog inputs, see Table 6-3 and Table 6-4