SBASA57 September   2023 AMC131M01

PRODUCTION DATA  

  1.   1
  2. Features
  3. Applications
  4. Description
  5. Revision History
  6. Pin Configuration and Functions
  7. 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  Insulation Specifications
    6. 6.6  Safety-Related Certifications
    7. 6.7  Safety Limiting Values
    8. 6.8  Electrical Characteristics
    9. 6.9  Timing Requirements
    10. 6.10 Switching Characteristics
    11. 6.11 Timing Diagrams
    12. 6.12 Typical Characteristics
  8. Parameter Measurement Information
    1. 7.1 Noise Measurements
  9. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Isolated DC/DC Converter
        1. 8.3.1.1 DC/DC Converter Failure Detection
      2. 8.3.2  High-Side Current Drive Capability
      3. 8.3.3  Isolation Channel Signal Transmission
      4. 8.3.4  Input ESD Protection Circuitry
      5. 8.3.5  Input Multiplexer
      6. 8.3.6  Programmable Gain Amplifier (PGA)
      7. 8.3.7  Voltage Reference
      8. 8.3.8  Internal Test Signals
      9. 8.3.9  Clocking and Power Modes
      10. 8.3.10 ΔΣ Modulator
      11. 8.3.11 Digital Filter
        1. 8.3.11.1 Digital Filter Implementation
          1. 8.3.11.1.1 Fast-Settling Filter
          2. 8.3.11.1.2 SINC3 and SINC3 + SINC1 Filter
        2. 8.3.11.2 Digital Filter Characteristic
      12. 8.3.12 Calibration Registers
      13. 8.3.13 Register Map CRC
      14. 8.3.14 General-Purpose Digital Output (GPO)
    4. 8.4 Device Functional Modes
      1. 8.4.1 Power-Up and Reset
        1. 8.4.1.1 Power-On Reset
        2. 8.4.1.2 SYNC/RESET Pin
        3. 8.4.1.3 RESET Command
      2. 8.4.2 Start-Up Behavior After Power-Up
      3. 8.4.3 Start-Up Behavior After a Pin Reset or RESET Command
      4. 8.4.4 Start-Up Behavior After a Pause in CLKIN
      5. 8.4.5 Synchronization
      6. 8.4.6 Conversion Modes
        1. 8.4.6.1 Continuous-Conversion Mode
        2. 8.4.6.2 Global-Chop Mode
      7. 8.4.7 Power Modes
      8. 8.4.8 Standby Mode
    5. 8.5 Programming
      1. 8.5.1 Serial Interface
        1. 8.5.1.1  Chip Select (CS)
        2. 8.5.1.2  Serial Data Clock (SCLK)
        3. 8.5.1.3  Serial Data Input (DIN)
        4. 8.5.1.4  Serial Data Output (DOUT)
        5. 8.5.1.5  Data Ready (DRDY)
        6. 8.5.1.6  Conversion Synchronization or System Reset (SYNC/RESET)
        7. 8.5.1.7  SPI Communication Frames
        8. 8.5.1.8  SPI Communication Words
        9. 8.5.1.9  Short SPI Frames
        10. 8.5.1.10 Communication Cyclic Redundancy Check (CRC)
        11. 8.5.1.11 SPI Timeout
      2. 8.5.2 ADC Conversion Data
      3. 8.5.3 Commands
        1. 8.5.3.1 NULL (0000 0000 0000 0000)
        2. 8.5.3.2 RESET (0000 0000 0001 0001)
        3. 8.5.3.3 STANDBY (0000 0000 0010 0010)
        4. 8.5.3.4 WAKEUP (0000 0000 0011 0011)
        5. 8.5.3.5 LOCK (0000 0101 0101 0101)
        6. 8.5.3.6 UNLOCK (0000 0110 0101 0101)
        7. 8.5.3.7 RREG (101a aaaa annn nnnn)
          1. 8.5.3.7.1 Reading a Single Register
          2. 8.5.3.7.2 Reading Multiple Registers
        8. 8.5.3.8 WREG (011a aaaa annn nnnn)
      4. 8.5.4 ADC Output Buffer and FIFO Buffer
      5. 8.5.5 Collecting Data for the First Time or After a Pause in Data Collection
    6. 8.6 AMC131M01 Registers
  10. Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Unused Inputs and Outputs
      2. 9.1.2 Antialiasing
      3. 9.1.3 Minimum Interface Connections
      4. 9.1.4 Multiple Device Configuration
      5. 9.1.5 Calibration
      6. 9.1.6 Troubleshooting
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Current Shunt Measurement
      3. 9.2.3 Application Curves
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documentation
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information
SINC3 and SINC3 + SINC1 Filter

The AMC131M01 selects the sinc3 filter path two conversions after power-up or device reset. For OSR settings of 64 to 1024, the sinc3 filter output directly feeds into the global-chop and calibration logic. For OSR settings of 2048 and higher, the sinc3 filter is followed by a sinc1 filter. The sinc3 filter operates at a fixed OSR of 1024 in this case while the sinc1 filter implements the additional OSRs of 2 to 16. Thus, when an OSR of 4096 (for example) is selected, the sinc3 filter operates at an OSR of 1024 and the sinc1 filter operates at an OSR of 4.

The filter has infinite attenuation at integer multiples of the data rate except for integer multiples of fMOD. As with all digital filters, the digital filter response of the AMC131M01 repeats at integer multiples of the modulator frequency, fMOD. The data rate and filter notch frequencies scale with fMOD.

When possible, plan frequencies for unrelated periodic processes in the application for integer multiples of the data rate such that any parasitic effect on data acquisition is effectively canceled by the notches of the digital filter. Avoid frequencies near integer multiples of fMOD whenever possible because tones in these bands can alias to the band of interest.

The sinc3 and sinc3 + sinc1 filters require time to settle after the ADC is enabled, the multiplexer or gain setting is changed, or a resynchronization event occurs. See the Synchronization section for more details on resynchronization. Table 8-5 lists the settling times of the sinc3 and sinc3 + sinc1 filters for each OSR setting. The AMC131M01 does not gate unsettled data. Therefore, the host must account for the filter settling time and disregard unsettled data if any are read. Wait for the duration of the settling times listed in Table 8-5 plus one additional conversion cycle before the data that was read can be considered valid.

Table 8-5 Digital Filter Settling Times
OSR (OVERALL) OSR (SINC3) OSR (SINC1) SETTLING TIME, detailed (tCLKIN) SETTLING TIME, total (tCLKIN)
64 64 N/A 3 × 64 + 44 + 4 240
128 128 N/A 3 × 128 + 44 + 4 432
256 256 N/A 3 × 256 + 44 + 4 816
512 512 N/A 3 × 512 + 44 + 4 1584
1024 1024 N/A 3 × 1024 + 44 + 4 3120
2048 1024 2 6 × 1024 + 44 + 4 6192
4096 1024 4 10 × 1024 + 44 + 4 10288
8192 1024 8 18 × 1024 + 44 + 4 18480
16384 1024 16 34 × 1024 + 44 + 4 34864