SNLS499D April   2016  – October 2019 DS90UB914A-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Simplified Schematic
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin Functions: DS90UB914A-Q1 Deserializer
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 AC Timing Specifications (SCL, SDA) - I2C-Compatible
    7. 7.7 Bidirectional Control Bus DC Timing Specifications (SCL, SDA) - I2C-Compatible
    8. 7.8 Deserializer Switching Characteristics
    9. 7.9 Typical Characteristics
  8. 8 Parameter Measurement Information
    1. 8.1 Timing Diagrams and Test Circuits
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1  Serial Frame Format
      2. 9.3.2  Line Rate Calculations for the DS90UB913A/914A
      3. 9.3.3  Deserializer Multiplexer Input
      4. 9.3.4  Error Detection
      5. 9.3.5  Synchronizing Multiple Cameras
      6. 9.3.6  General-Purpose I/O (GPIO) Descriptions
      7. 9.3.7  LVCMOS VDDIO Option
      8. 9.3.8  EMI Reduction
        1. 9.3.8.1 Deserializer Staggered Output
        2. 9.3.8.2 Spread Spectrum Clock Generation (SSCG) on the Deserializer
      9. 9.3.9  Pixel Clock Edge Select (TRFB / RRFB)
      10. 9.3.10 Power Down
    4. 9.4 Device Functional Modes
      1. 9.4.1 DS90UB913A/914A Operation With External Oscillator as Reference Clock
      2. 9.4.2 DS90UB913A/914A Operation With Pixel Clock From Imager as Reference Clock
      3. 9.4.3 MODE Pin on Deserializer
      4. 9.4.4 Clock-Data Recovery Status Flag (LOCK), Output Enable (OEN) and Output State Select (OSS_SEL)
      5. 9.4.5 Built-In Self Test
      6. 9.4.6 BIST Configuration and Status
      7. 9.4.7 Sample BIST Sequence
    5. 9.5 Programming
      1. 9.5.1 Programmable Controller
      2. 9.5.2 Description of Bidirectional Control Bus and I2C Modes
      3. 9.5.3 I2C Pass-Through
      4. 9.5.4 Slave Clock Stretching
      5. 9.5.5 ID[x] Address Decoder on the Deserializer
      6. 9.5.6 Multiple Device Addressing
    6. 9.6 Register Maps
  10. 10Application and Implementation
    1. 10.1 Application Information
      1. 10.1.1 Power Over Coax
      2. 10.1.2 Power-Up Requirements and PDB Pin
      3. 10.1.3 AC Coupling
      4. 10.1.4 Transmission Media
      5. 10.1.5 Adaptive Equalizer – Loss Compensation
    2. 10.2 Typical Applications
      1. 10.2.1 Coax Application
        1. 10.2.1.1 Design Requirements
        2. 10.2.1.2 Detailed Design Procedure
        3. 10.2.1.3 Application Curves
      2. 10.2.2 STP Application
        1. 10.2.2.1 Design Requirements
        2. 10.2.2.2 Detailed Design Procedure
        3. 10.2.2.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
      1. 12.1.1 Interconnect Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Documentation Support
      1. 13.1.1 Related Documentation
    2. 13.2 Receiving Notification of Documentation Updates
    3. 13.3 Community Resources
    4. 13.4 Trademarks
    5. 13.5 Electrostatic Discharge Caution
    6. 13.6 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

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

9.4.1 DS90UB913A/914A Operation With External Oscillator as Reference Clock

In some applications, the pixel clock that comes from the imager can have jitter which exceeds the tolerance of the DS90UB913A/914A chipsets. In this case, the DS90UB913A-Q1 device should be operated by using an external clock source as the reference clock for the DS90UB913A/914A chipsets. This is the recommended operating mode. The external oscillator clock output goes through a divide-by-2 circuit in the DS90UB913A-Q1 Serializer and this divided clock output is used as the reference clock for the imager. The output data and pixel clock from the imager are then fed into the DS90UB913A-Q1 device. Figure 16 shows the operation of the DS90UB13A/914A chipsets while using an external automotive grade oscillator.

DS90UB914A-Q1 EXT_OSC_MODE.gifFigure 16. DS90UB913A-Q1/914A-Q1 Operation in the External Oscillator Mode

When the DS90UB913A-Q1 device is operated using an external oscillator, the GPO3 pin on the DS90UB913A-Q1 is the input pin for the external oscillator. In applications where the DS90UB913A-Q1 device is operated from an external oscillator, the divide-by-2 circuit in the DS90UB913A-Q1 device feeds back the divided clock output to the imager device through GPO2 pin. The pixel clock to external oscillator ratios needs to be fixed for the 12–bit high frequency mode and the 10–bit mode. In the 10-bit mode, the pixel clock frequency divided by the external oscillator frequency must be 2. In the 12-bit high frequency mode, the pixel clock frequency divided by the external oscillator frequency must be 1.5. For example, if the external oscillator frequency is 48 MHz in the 10–bit mode, the pixel clock frequency of the imager needs to be twice of the external oscillator frequency, that is, 96 MHz. If the external oscillator frequency is 48MHz in the 12-bit high frequency mode, the pixel clock frequency of the imager needs to be 1.5 times of the external oscillator frequency, that is, 72 MHz. In external oscillator mode, GPO2 and GPO3 on the Serializer cannot act as the output of the input signal coming from GPIO2 or GPIO3 on the Deserializer.

Table 1. Device Functional Mode With Example XCLKIN = 48 MHz

MODE GPIO3 XCLKIN GPIO2 XCLKOUT = XCLKIN / 2 RATIO INPUT PCLK FREQUENCY = XLCKIN * RATIO
10-bit 48 MHz 24 MHz 2 96 MHz
12-bit High Frequency (HF) 48 MHz 24 MHz 1.5 72 MHz
12-bit Low Frequency (LF) 48 MHz 24 MHz 1 48 MHz