SBASB21 September   2024 DDS39RF12 , DDS39RFS12

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison
  6. 5 Pin Configuration and Functions
  7. 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 - DC Specifications
    6. 6.6  Electrical Characteristics - AC Specifications
    7. 6.7  Electrical Characteristics - Power Consumption
    8. 6.8  Timing Requirements
    9. 6.9  Switching Characteristics
    10. 6.10 SPI and FRI Timing Diagrams
    11. 6.11 Typical Characteristics: Single Tone Spectra
    12. 6.12 Typical Characteristics: Dual Tone Spectra
    13. 6.13 Typical Characteristics: Power Dissipation and Supply Currents
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagrams
    3. 7.3 Feature Description
      1. 7.3.1 DAC Output Modes
        1. 7.3.1.1 NRZ Mode
        2. 7.3.1.2 RTZ Mode
        3. 7.3.1.3 RF Mode
        4. 7.3.1.4 DES Mode
      2. 7.3.2 DAC Core
        1. 7.3.2.1 DAC Output Structure
        2. 7.3.2.2 Full-Scale Current Adjustment
      3. 7.3.3 DEM and Dither
      4. 7.3.4 Offset Adjustment
      5. 7.3.5 Clocking Subsystem
        1. 7.3.5.1 SYSREF Frequency Requirements
        2. 7.3.5.2 SYSREF Position Detector and Sampling Position Selection (SYSREF Windowing)
      6. 7.3.6 Digital Signal Processing Blocks
        1. 7.3.6.1 Digital Upconverter (DUC)
          1. 7.3.6.1.1 Interpolation Filters
          2. 7.3.6.1.2 Numerically Controlled Oscillator (NCO)
            1. 7.3.6.1.2.1 Phase-Continuous NCO Update Mode
            2. 7.3.6.1.2.2 Phase-coherent NCO Update Mode
            3. 7.3.6.1.2.3 Phase-sync NCO Update Mode
            4. 7.3.6.1.2.4 NCO Synchronization
              1. 7.3.6.1.2.4.1 JESD204C LSB Synchonization
            5. 7.3.6.1.2.5 NCO Mode Programming
          3. 7.3.6.1.3 Mixer Scaling
        2. 7.3.6.2 Channel Bonder
        3. 7.3.6.3 DES Interpolator
      7. 7.3.7 JESD204C Interface
        1. 7.3.7.1  Deviation from JESD204C Standard
        2. 7.3.7.2  Transport Layer
        3. 7.3.7.3  Scrambler and Descrambler
        4. 7.3.7.4  Link Layer
        5. 7.3.7.5  Physical Layer
        6. 7.3.7.6  Serdes PLL Control
        7. 7.3.7.7  Serdes Crossbar
        8. 7.3.7.8  Multi-Device Synchronization and Deterministic Latency
          1. 7.3.7.8.1 Programming RBD
        9. 7.3.7.9  Operation in Subclass 0 Systems
        10. 7.3.7.10 Link Reset
      8. 7.3.8 Alarm Generation
    4. 7.4 Device Functional Modes
      1. 7.4.1 DUC and DDS Modes
      2. 7.4.2 JESD204C Interface Modes
        1. 7.4.2.1 JESD204C Interface Modes
        2. 7.4.2.2 JESD204C Format Diagrams
          1. 7.4.2.2.1 16-bit Formats
      3. 7.4.3 NCO Synchronization Latency
      4. 7.4.4 Data Path Latency
    5. 7.5 Programming
      1. 7.5.1 Using the Standard SPI Interface
        1. 7.5.1.1 SCS
        2. 7.5.1.2 SCLK
        3. 7.5.1.3 SDI
        4. 7.5.1.4 SDO
        5. 7.5.1.5 Serial Interface Protocol
        6. 7.5.1.6 Streaming Mode
      2. 7.5.2 Using the Fast Reconfiguration Interface
      3. 7.5.3 SPI Register Map
  9. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Startup Procedure for DUC/Bypass Mode
      2. 8.1.2 Startup Procedure for DDS Mode
      3. 8.1.3 Understanding Dual Edge Sampling Modes
      4. 8.1.4 Eye Scan Procedure
      5. 8.1.5 Pre/Post Cursor Analysis Procedure
      6. 8.1.6 Sleep and Disable Modes
    2. 8.2 Typical Application
      1. 8.2.1 S-Band Radar Transmitter
      2. 8.2.2 Design Requirements
      3. 8.2.3 Detailed Design Procedure
      4. 8.2.4 Detailed Clocking Subsystem Design Procedure
        1. 8.2.4.1 Example 1: SWAP-C Optimized
        2. 8.2.4.2 Example 2: Improved Phase Noise LMX2820 with External VCO
        3. 8.2.4.3 Example 3: Discrete Analog PLL for Best DAC Performance
        4. 8.2.4.4 10GHz Clock Generation
      5. 8.2.5 Application Curves
    3. 8.3 Power Supply Recommendations
      1. 8.3.1 Power Up and Down Sequence
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines and Example
  10. 9 Device and Documentation Support
    1. 9.1 Receiving Notification of Documentation Updates
    2. 9.2 Support Resources
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

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

The first operation of the DUC is to interpolate the input signal to a higher data rate. The available interpolation options are summarized in Table 7-8. The sampling rate of the input signal is multiplied by the specified interpolation amount to determine the DAC output rate, subject to the maximum sample rate for the DDS39RF12 and 'RFS12. These rates do not include the optional 2x interpolation for DES mode. For interpolations rates 6x and below, a reduced number of DUC channels are available.

Table 7-8 Summary of Interpolation Options
INTERPOLATIONMaximum Number of DUC channels
2x1
3x1
4x2
6x2
8x4
12x4
16x4
24x4
32x4
48x4
64x4
96x4
128x4
192x4
256x4

Each DUC contains multiple 2x or 3x interpolating filters. The filter coefficients for each filter are listed in Table 7-9 and the filters used for each interpolation factor are shown in Table 7-10. The interpolation filter composite responses are given in Figure 7-14 to Figure 7-42. The filters are designed to provide a passband bandwidth of 80% on the input bandwidth and passband ripple less than 0.01 dB. The stopband attenuation is greater than 90 dB for any signal within the passband.

Table 7-9 Interpolation Filter Coefficients
Filter Coefficients (Center Tap in Bold)
fir1 [6 0 -19 0 47 0 -100 0 192 0 -342 0 572 0 -914 0 1409 0 -2119 0 3152 0 -4729 0 7420 0 -13334 0 41527 65536 41527 0 -13334 0 7420 0 -4729 0 3152 0 -2119 0 1409 0 -914 0 572 0 -342 0 192 0 -100 0 47 0 -19 0 6 ]*2-16
fir2 [-12 0 84 0 -336 0 1006 0 -2691 0 10141 16384 10141 0 -2691 0 1006 0 -336 0 84 0 -12 ]*2-14
fir3 [29 0 -214 0 1209 2048 1209 0 -214 0 29 ]*2-11
fir4 [3 0 -25 0 150 256 150 0 -25 0 3 ]*2-8
fir5 [-1 0 9 16 9 0 -1 ]*2-4
fir_3x -38 -38 0 83 117 0 -214 -281 0 464 584 0 -900 -1102 0 1612 1929 0 -2713 -3190 0 4346 5040 0 -6699 -7684 0 10023 11408 0 -14701 -16661 0 21389 24260 0 -31417 -35960 0 48101 56540 0 -82781 -105224 0 215190 432780 524288 432780 215190 0 -105224 -82781 0 56540 48101 0 -35960 -31417 0 24260 21389 0 -16661 -14701 0 11408 10023 0 -7684 -6699 0 5040 4346 0 -3190 -2713 0 1929 1612 0 -1102 -900 0 584 464 0 -281 -214 0 117 83 0 -38 -38 ]*2-19
Table 7-10 Filters Used vs. DUC Interpolation Factor
DUC Interpolation Factor (LDUC) Filters Used in DUC
1st Filter 2nd Filter 3rd Filter 4th Filter 5th Filter 6th Filter 7th Filter 8th Filter
2x fir1
3x fir_3x
4x fir1 fir2
6x fir_3x fir2
8x fir1 fir2 fir3
12x fir_3x fir2 fir3
16x fir1 fir2 fir3 fir4
24x fir_3x fir2 fir3 fir4
32x fir1 fir2 fir3 fir4 fir5
48x fir_3x fir2 fir3 fir4 fir5
64x fir1 fir2 fir3 fir4 fir5 fir5
96x fir_3x fir2 fir3 fir4 fir5 fir5
128x fir1 fir2 fir3 fir4 fir4 fir5 fir5
192x fir_3x fir2 fir3 fir4 fir4 fir5 fir5
256x fir1 fir2 fir3 fir4 fir4 fir4 fir5 fir5
DDS39RF12 DDS39RFS12 2x Interpolation Filter ResponseFigure 7-14 2x Interpolation Filter Response
DDS39RF12 DDS39RFS12 3x Interpolation Filter ResponseFigure 7-16 3x Interpolation Filter Response
DDS39RF12 DDS39RFS12 4x Interpolation Filter ResponseFigure 7-18 4x Interpolation Filter Response
DDS39RF12 DDS39RFS12 6x Interpolation Filter ResponseFigure 7-20 6x Interpolation Filter Response
DDS39RF12 DDS39RFS12 8x Interpolation Filter ResponseFigure 7-22 8x Interpolation Filter Response
DDS39RF12 DDS39RFS12 12x Interpolation Filter ResponseFigure 7-24 12x Interpolation Filter Response
DDS39RF12 DDS39RFS12 16x Interpolation Filter ResponseFigure 7-26 16x Interpolation Filter Response
DDS39RF12 DDS39RFS12 24x Interpolation Filter ResponseFigure 7-28 24x Interpolation Filter Response
DDS39RF12 DDS39RFS12 32x Interpolation Filter ResponseFigure 7-30 32x Interpolation Filter Response
DDS39RF12 DDS39RFS12 48x Interpolation Filter ResponseFigure 7-32 48x Interpolation Filter Response
DDS39RF12 DDS39RFS12 64x Interpolation Filter ResponseFigure 7-34 64x Interpolation Filter Response
DDS39RF12 DDS39RFS12 96x Interpolation Filter ResponseFigure 7-36 96x Interpolation Filter Response
DDS39RF12 DDS39RFS12 128x Interpolation Filter ResponseFigure 7-38 128x Interpolation Filter Response
DDS39RF12 DDS39RFS12 192x Interpolation Filter ResponseFigure 7-40 192x Interpolation Filter Response
DDS39RF12 DDS39RFS12 256x Interpolation Filter ResponseFigure 7-42 256x Interpolation Filter Response
DDS39RF12 DDS39RFS12 2x Interpolation Filter Passband ResponseFigure 7-15 2x Interpolation Filter Passband Response
DDS39RF12 DDS39RFS12 3x Interpolation Filter Passband ResponseFigure 7-17 3x Interpolation Filter Passband Response
DDS39RF12 DDS39RFS12 4x Interpolation Filter Passband ResponseFigure 7-19 4x Interpolation Filter Passband Response
DDS39RF12 DDS39RFS12 6x Interpolation Filter Passband ResponseFigure 7-21 6x Interpolation Filter Passband Response
DDS39RF12 DDS39RFS12 8x Interpolation Filter Passband ResponseFigure 7-23 8x Interpolation Filter Passband Response
DDS39RF12 DDS39RFS12 12x Interpolation Filter Passband ResponseFigure 7-25 12x Interpolation Filter Passband Response
DDS39RF12 DDS39RFS12 16x Interpolation Filter Passband ResponseFigure 7-27 16x Interpolation Filter Passband Response
DDS39RF12 DDS39RFS12 24x Interpolation Filter Passband ResponseFigure 7-29 24x Interpolation Filter Passband Response
DDS39RF12 DDS39RFS12 32x Interpolation Filter Passband ResponseFigure 7-31 32x Interpolation Filter Passband Response
DDS39RF12 DDS39RFS12 48x Interpolation Filter Passband ResponseFigure 7-33 48x Interpolation Filter Passband Response
DDS39RF12 DDS39RFS12 64x Interpolation Filter Passband ResponseFigure 7-35 64x Interpolation Filter Passband Response
DDS39RF12 DDS39RFS12 96x Interpolation Filter Passband ResponseFigure 7-37 96x Interpolation Filter Passband Response
DDS39RF12 DDS39RFS12 128x Interpolation Filter Passband ResponseFigure 7-39 128x Interpolation Filter Passband Response
DDS39RF12 DDS39RFS12 192x Interpolation Filter Passband ResponseFigure 7-41 192x Interpolation Filter Passband Response
DDS39RF12 DDS39RFS12 256x Interpolation Filter Passband ResponseFigure 7-43 256x Interpolation Filter Passband Response