SBAS840C July   2020  – December 2022 ADC3541 , ADC3542 , ADC3543

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 - Power Consumption
    6. 6.6  Electrical Characteristics - DC Specifications
    7. 6.7  Electrical Characteristics - AC Specifications ADC3541
    8. 6.8  Electrical Characteristics - AC Specifications ADC3542
    9. 6.9  Electrical Characteristics - AC Specifications ADC3543
    10. 6.10 Timing Requirements
    11. 6.11 Typical Characteristics: ADC3541
    12. 6.12 Typical Characteristics: ADC3542
    13. 6.13 Typical Characteristics: ADC3543
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Analog Input
        1. 8.3.1.1 Analog Input Bandwidth
        2. 8.3.1.2 Analog Front End Design
          1. 8.3.1.2.1 Sampling Glitch Filter Design
          2. 8.3.1.2.2 Single Ended Input
          3. 8.3.1.2.3 Analog Input Termination and DC Bias
            1. 8.3.1.2.3.1 AC-Coupling
            2. 8.3.1.2.3.2 DC-Coupling
        3. 8.3.1.3 Auto-Zero Feature
      2. 8.3.2 Clock Input
        1. 8.3.2.1 Single Ended vs Differential Clock Input
        2. 8.3.2.2 Signal Acquisition Time Adjust
      3. 8.3.3 Voltage Reference
        1. 8.3.3.1 Internal voltage reference
        2. 8.3.3.2 External voltage reference (VREF)
        3. 8.3.3.3 External voltage reference with internal buffer (REFBUF)
      4. 8.3.4 Digital Down Converter
        1. 8.3.4.1 Digital Filter Operation
        2. 8.3.4.2 FS/4 Mixing with Real Output
        3. 8.3.4.3 Numerically Controlled Oscillator (NCO) and Digital Mixer
        4. 8.3.4.4 Decimation Filter
        5. 8.3.4.5 SYNC
        6. 8.3.4.6 Output Formatting with Decimation
          1. 8.3.4.6.1 Parallel CMOS
          2. 8.3.4.6.2 Serialized CMOS Interface
      5. 8.3.5 Digital Interface
        1. 8.3.5.1 Parallel CMOS Output
        2. 8.3.5.2 Serialized CMOS output
          1. 8.3.5.2.1 SDR Output Clocking
        3. 8.3.5.3 Output Data Format
        4. 8.3.5.4 Output Formatter
        5. 8.3.5.5 Output Bit Mapper
        6. 8.3.5.6 Output Interface/Mode Configuration
          1. 8.3.5.6.1 Configuration Example
      6. 8.3.6 Test Pattern
    4. 8.4 Device Functional Modes
      1. 8.4.1 Normal operation
      2. 8.4.2 Power Down Options
    5. 8.5 Programming
      1. 8.5.1 Configuration using PINs only
      2. 8.5.2 Configuration Using the SPI Interface
        1. 8.5.2.1 Register Write
        2. 8.5.2.2 Register Read
    6. 8.6 Register Map
      1. 8.6.1 Detailed Register Description
  9. 9 Application Information Disclaimer
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Input Signal Path
        2. 9.2.2.2 Sampling Clock
        3. 9.2.2.3 Voltage Reference
      3. 9.2.3 Application Curves
    3. 9.3 Initialization Set Up
      1. 9.3.1 Register Initialization During Operation
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Receiving Notification of Documentation Updates
    2. 12.2 Support Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.3.5.4 Output Formatter

The digital output interface utilizes a flexible output bit mapper Figure 8-41. The bit mapper takes the 14-bit output directly from the ADC or from digital filter block and reformats it to a resolution of 14, 16, 18 or 20-bit. With parallel output format the maximum output resolution supported is 16-bit. With serial CMOS output the output serialization factor gets adjusted accordingly for 2- and 1-wire interface mode. The maximum output data rate can not be exceeded independently of output resolution and serialization factor.

Figure 8-41 Interface output bit mapper

Table 8-9 provides an overview for the resulting serialization factor depending on output resolution and output modes. Note that the DCLKIN frequency needs to be adjusted accordingly as well. Changing the output resolution to 16-bit, 2-wire mode for example would result in DCLKIN = FS * 4 instead of * 3.5.

The output bit mapper can be used for bypass and decimation filter.

Table 8-9 Serialization factor vs output resolution for different output modes
OUTPUT RESOLUTIONInterfaceSERIALIZATIONFCLKDCLKINDCLKD0/D1
14-bit (default)2-Wire7xFS/2FS* 3.5FS* 3.5FS* 7
1-Wire14xFSFS* 7FS* 7FS* 14
16-bit2-Wire8xFS/2FS* 4FS* 4FS* 8
1-Wire16xFSFS* 8FS* 8FS* 16
18-bit2-Wire9xFS/2FS* 4.5FS* 4.5FS* 9
1-Wire18xFSFS* 9FS* 9FS* 18
20-bit2-Wire10xFS/2FS* 5FS* 5FS* 10
1-Wire20xFSFS* 10FS* 10FS* 20

The programming sequence to change the output interface and/or resolution from default settings is shown in Section 8.3.5.6.