SBASAP4 April   2025 ADC3664-EP , ADC3664-SEP

PRODUCTION DATA  

  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 - Power Consumption
    6. 5.6 Electrical Characteristics - DC Specifications
    7. 5.7 Electrical Characteristics - AC Specifications
    8. 5.8 Timing Requirements
    9. 5.9 Typical Characteristics
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Analog Input
        1. 7.3.1.1 Analog Input Bandwidth
        2. 7.3.1.2 Analog Front End Design
          1. 7.3.1.2.1 Sampling Glitch Filter Design
          2. 7.3.1.2.2 Analog Input Termination and DC Bias
            1. 7.3.1.2.2.1 AC-Coupling
            2. 7.3.1.2.2.2 DC-Coupling
      2. 7.3.2 Clock Input
        1. 7.3.2.1 Single Ended vs Differential Clock Input
      3. 7.3.3 Voltage Reference
        1. 7.3.3.1 Internal voltage reference
        2. 7.3.3.2 External voltage reference (VREF)
        3. 7.3.3.3 External voltage reference with internal buffer (REFBUF/CTRL)
      4. 7.3.4 Digital Down Converter
        1. 7.3.4.1 DDC MUX
        2. 7.3.4.2 Digital Filter Operation
        3. 7.3.4.3 FS/4 Mixing with Real Output
        4. 7.3.4.4 Numerically Controlled Oscillator (NCO) and Digital Mixer
        5. 7.3.4.5 Decimation Filter
        6. 7.3.4.6 SYNC
        7. 7.3.4.7 Output Formatting with Decimation
      5. 7.3.5 Digital Interface
        1. 7.3.5.1 Output Formatter
        2. 7.3.5.2 Output Bit Mapper
          1. 7.3.5.2.1 2-Wire Mode
          2. 7.3.5.2.2 1-Wire Mode
          3. 7.3.5.2.3 ½-Wire Mode
        3. 7.3.5.3 Output Interface and Mode Configuration
          1. 7.3.5.3.1 Configuration Example
        4. 7.3.5.4 Output Data Format
      6. 7.3.6 Test Pattern
    4. 7.4 Device Functional Modes
      1. 7.4.1 Normal operation
      2. 7.4.2 Power Down Options
    5. 7.5 Programming
      1. 7.5.1 Configuration using PINs only
      2. 7.5.2 Configuration using the SPI interface
        1. 7.5.2.1 Register Write
        2. 7.5.2.2 Register Read
  9. 8 Application Information Disclaimer
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Input Signal Path
        2. 8.2.2.2 Sampling Clock
        3. 8.2.2.3 Voltage Reference
      3. 8.2.3 Application Curves
    3. 8.3 Initialization Set Up
      1. 8.3.1 Register Initialization During Operation
    4. 8.4 Power Supply Recommendations
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
      2. 8.5.2 Layout Example
  10. 9 Register Maps
    1. 9.1 Detailed Register Description
  11. 10Device and Documentation Support
    1. 10.1 Receiving Notification of Documentation Updates
    2. 10.2 Support Resources
    3. 10.3 Trademarks
    4. 10.4 Electrostatic Discharge Caution
    5. 10.5 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information
    1. 12.1 Mechanical Data

8.2.2.2 Sampling Clock

Applications operating with low input frequencies (such as DC to 30MHz) typically are less sensitive to performance degradation due to clock jitter. The internal ADC aperture jitter improves with faster rise and fall times (that is, square wave vs sine wave). Table 8-4 provides an overview of the estimated SNR performance of the ADC3664-xEP based on different amounts of jitter of the external clock source. The SNR is estimated based on ADC3664-xEP thermal noise of 77.5dBFS and input signal at −1dBFS.

Termination of the clock input should be considered for long clock traces.

Table 8-4 ADC SNR performance across vs input frequency for different amounts of external clock jitter
INPUT FREQUENCYTJ,EXT = 100fsTJ,EXT = 250fsTJ,EXT = 500fsTJ,EXT = 1ps
10MHz77.477.477.376.8
20MHz77.377.276.775.1
30MHz77.176.875.873.2