SBAS603B April   2013  – November 2020 ADS4449

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
    6. 6.6  Digital Characteristics
    7. 6.7  Timing Requirements
    8. 6.8  Timing Characteristics, Serial interface
    9. 6.9  Typical Characteristics
    10. 6.10 Typical Characteristics: Contour
  7. 7 Parameter Measurement Information
    1. 7.1 LVDS Output Timing
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Overrange Indication (OVRxx)
      2. 8.3.2 Gain for SFDR and SNR Trade-Off
    4. 8.4 Device Functional Modes
      1. 8.4.1 Special Performance Modes
      2. 8.4.2 Digital Output Information
        1. 8.4.2.1 DDR LVDS Outputs
          1. 8.4.2.1.1 LVDS Output Data and Clock Buffers
          2. 8.4.2.1.2 Output Data Format
      3. 8.4.3 Using High SNR Mode Register Settings
      4. 8.4.4 Input Common Mode
    5. 8.5 Programming
      1. 8.5.1 Serial Interface
        1. 8.5.1.1 Register Initialization
        2. 8.5.1.2 Serial Register Readout
    6. 8.6 Register Maps
      1. 8.6.1 Register Description
        1. 8.6.1.1  Register Address 00h (Default = 00h)
        2. 8.6.1.2  Register Address 01h (Default = 00h)
        3. 8.6.1.3  Register Address 25h (Default = 00h)
        4. 8.6.1.4  Register Address 2bh (Default = 00h)
        5. 8.6.1.5  Register Address 31h (Default = 00h)
        6. 8.6.1.6  Register Address 37h (Default = 00h)
        7. 8.6.1.7  Register Address 3dh (Default = 00h)
        8. 8.6.1.8  Register Address 3fh (Default = 00h)
        9. 8.6.1.9  Register Address 40h (Default = 00h)
        10. 8.6.1.10 Register Address 42h (Default = 00h)
        11. 8.6.1.11 Register Address 45h (Default = 00h)
        12. 8.6.1.12 Register Address 4ah (Defalut = 00h)
        13. 8.6.1.13 Register Address 62h (Default = 00h)
        14. 8.6.1.14 Register Address 7ah (Default = 00h)
        15. 8.6.1.15 Register Address 92h (Default = 00h)
        16. 8.6.1.16 Register Address A9h (Default = 00h)
        17. 8.6.1.17 Register Address Ach (Default = 00h)
        18. 8.6.1.18 Register Address C3h (Default = 00h)
        19. 8.6.1.19 Register Address C4h (Default = 00h)
        20. 8.6.1.20 Register Address Cfh (Default = 00h)
        21. 8.6.1.21 Register Address D6h (Default = 00h)
        22. 8.6.1.22 Register Address D7h (Default = 00h)
        23. 8.6.1.23 Register Address F1h (Default = 00h)
        24. 8.6.1.24 Register Address 58h (Default = 00h)
        25. 8.6.1.25 Register Address 59h (Default = 00h)
        26. 8.6.1.26 Register Address 70h (Default = 00h)
        27. 8.6.1.27 Register Address 71h (Default = 00h)
        28. 8.6.1.28 Register Address 88h (Default = 00h)
        29. 8.6.1.29 Register Address 89h (Default = 00h)
        30. 8.6.1.30 Register Address A0h (Default = 00h)
        31. 8.6.1.31 Register Address A1h (Default = 00h)
        32. 8.6.1.32 Register Address Feh (Default = 00h)
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curves
      4. 9.2.4 Enabling 14-Bit Resolution
      5. 9.2.5 Analog Input
      6. 9.2.6 Drive Circuit Requirements
      7. 9.2.7 Clock Input
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Nomenclature
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Support Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary

Package Options

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

8.3.1 Overrange Indication (OVRxx)

After reset, all serial interface register "ALWAYS WRITE 1". Bits must be set to 1. Afterwards, 13-bit data are output on the Dxx13P, Dxx13M to Dxx1P, Dxx1M terminals and overrange information is output on the Dxx0P and Dxx0M terminals (where xx = channels A and B or channels C and D).

When the DIS OVR ON LSB bit is set to 1, 14-bit data are output on the Dxx13P, Dxx13M to Dxx0P, Dxx0M terminals without overrange information on the LSB bits.

The OVR timing diagram (13-bit data with OVR) is shown in Figure 8-1. In 14-bit mode, OVR is disabled by setting the DIS OVR ON LSB bit to 1, as shown in Figure 8-2.

GUID-6BA3CFAD-685D-48AD-B6EA-44EE3C537C52-low.gif Figure 8-1 13-Bit Data with OVR (Register Bits ALWAYS WRITE 1 = 1 and DIS OVR ON LSB = 0)
GUID-929F8C2A-8FB7-4C5C-870B-4DF9663FF39A-low.gif Figure 8-2 14-Bit Mode (Register Bits ALWAYS WRITE 1 = 1 and DIS OVR ON LSB = 1)

Normal overrange indication (OVR) shows the event of the device digital output being saturated when the input signal exceeds the ADC full-scale range. Normal OVR has the same latency as digital output data. However, an overrange event can be indicated earlier (than normal latency) by using the fast OVR mode. The fast OVR mode (enabled by default) is triggered seven clock cycles after the overrange condition that occurred at the ADC input. The fast OVR thresholds are programmable with the FAST OVR THRESH PROG bits (refer to Table 8-3, register address C3h). At any time, either normal or fast OVR mode can be programmed on the Dxx0P and Dxx0M terminals.