SLASEF4B February   2017  – July 2017 DAC38RF86 , DAC38RF87 , DAC38RF96 , DAC38RF97

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  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 - DC Specifications
    6. 7.6  Electrical Characteristics - Digital Specifications
    7. 7.7  Electrical Characteristics - AC Specifications
    8. 7.8  PLL/VCO Electrical Characteristics
    9. 7.9  Timing Requirements
    10. 7.10 Typical Characteristics, DAC38RF86 and DAC38RF96
      1. 7.10.1 Typical Characteristics, DAC38RF87 and DAC38RF97
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagrams
    3. 8.3 Feature Description
      1. 8.3.1  SerDes Inputs
      2. 8.3.2  SerDes Rate
      3. 8.3.3  SerDes PLL
      4. 8.3.4  SerDes Equalizer
      5. 8.3.5  JESD204B Descrambler
      6. 8.3.6  JESD204B Frame Assembly
      7. 8.3.7  SYNC Interface
      8. 8.3.8  Single or Dual Link Configuration
      9. 8.3.9  Multi-Device Synchronization
      10. 8.3.10 SYSREF Capture Circuit
      11. 8.3.11 JESD204B Subclass 0 support
      12. 8.3.12 SerDes Test Modes through Serial Programming
      13. 8.3.13 SerDes Test Modes through IEEE 1500 Programming
      14. 8.3.14 Error Counter
      15. 8.3.15 Eye Scan
      16. 8.3.16 JESD204B Pattern Test
      17. 8.3.17 Multiband DUC (multi-DUC)
        1. 8.3.17.1 Multi-DUC input
        2. 8.3.17.2 Interpolation Filters
        3. 8.3.17.3 JESD204B Modes, Interpolation and Clock phase Programming
        4. 8.3.17.4 Digital Quadrature Modulator
        5. 8.3.17.5 Low Power Coarse Resolution Mixing Modes
        6. 8.3.17.6 Inverse Sinc Filter
        7. 8.3.17.7 Summation Block for Dual DUC Modes
      18. 8.3.18 PA Protection Block
      19. 8.3.19 Gain Block
      20. 8.3.20 Output Summation
      21. 8.3.21 Output Delay
      22. 8.3.22 Polarity Inversion
      23. 8.3.23 Temperature Sensor
      24. 8.3.24 Alarm Monitoring
      25. 8.3.25 Differential Clock Inputs
      26. 8.3.26 CMOS Digital Inputs
      27. 8.3.27 DAC Fullscale Output Current
      28. 8.3.28 Current Steering DAC Architecture
      29. 8.3.29 DAC Transfer Function
    4. 8.4 Device Functional Modes
      1. 8.4.1 Clocking Modes
      2. 8.4.2 PLL Bypass Mode Programming
      3. 8.4.3 Internal PLL/VCO
      4. 8.4.4 CLKOUT
      5. 8.4.5 Serial Peripheral Interface (SPI)
        1. 8.4.5.1 NORMAL (RW)
        2. 8.4.5.2 WRITE_TO_CLEAR (W0C)
    5. 8.5 Register Maps
      1. 8.5.1  Chip Reset and Configuration Register (address = 0x00) [reset = 0x5803]
      2. 8.5.2  IO Configuration Register (address = 0x01) [reset = 0x1800]
      3. 8.5.3  Lane Single Detect Alarm Mask Register (address = 0x02) [reset = 0xFFFF]
      4. 8.5.4  Clock Alarms Mask Register (address = 0x03) [reset = 0xFFFF
      5. 8.5.5  SERDES Loss of Signal Detection Alarms Register (address = 0x04) [reset = 0x0000]
      6. 8.5.6  SYSREF Alignment Circuit Alarms Register (address = 0x05) [reset = 0x0000]
      7. 8.5.7  Temperature Sensor and PLL Loop Voltage Register (address = 0x06) [reset = variable]
      8. 8.5.8  Page Set Register (address = 0x09) [reset = 0x0000]
      9. 8.5.9  SYSREF Align to r1 and r3 Count Register (address = 0x78) [reset = 0x0000]
      10. 8.5.10 SYSREF Phase Count 1 and 2 Register (address = 0x79) [reset = 0x0000]
      11. 8.5.11 SYSREF Phase Count 3 and 4 Register (address = 0x7A) [reset = 0x0000]
      12. 8.5.12 Vendor ID and Chip Version Register (address = 0x7F) [reset = 0x0008]]
      13. 8.5.13 Multi-DUC Configuration (PAP, Interpolation) Register (address = 0x0A) [reset = 0x02B0]
      14. 8.5.14 Multi-DUC Configuration (Mixers) Register (address = 0x0C) [reset = 0x2402]
      15. 8.5.15 JESD FIFO Control Register (address = 0x0D) [reset = 0x1300]
      16. 8.5.16 Alarm Mask 1 Register (address = 0x0E) [reset = 0x00FF]
      17. 8.5.17 Alarm Mask 2 Register (address = 0x0F) [reset = 0xFFFF]
      18. 8.5.18 Alarm Mask 3 Register (address = 0x10) [reset = 0xFFFF]
      19. 8.5.19 Alarm Mask 4 Register (address = 0x11) [reset = 0xFFFF]
      20. 8.5.20 JESD Lane Skew Register (address = 0x12) [reset = 0x0000]
      21. 8.5.21 CMIX Configuration Register (address = 0x17) [reset = 0x0000]
      22. 8.5.22 Output Summation and Delay Register (address = 0x19) [reset = 0x0000]
      23. 8.5.23 NCO Phase Path AB Register (address = 0x1C) [reset = 0x0000]
      24. 8.5.24 NCO Phase Path CD Register (address = 0x1D) [reset = 0x0000]
      25. 8.5.25 NCO Frequency Path AB Register (address = 0x1E-0x20) [reset = 0x0000 0000 0000]
      26. 8.5.26 NCO Frequency Path CD Register (address = 0x21-0x23) [reset = 0x0000 0000 0000]
      27. 8.5.27 SYSREF Use for Clock Divider Register (address = 0x24) [reset = 0x0010]
      28. 8.5.28 Serdes Clock Control Register (address = 0x25) [reset = 0x7700]
      29. 8.5.29 Sync Source Control 1 Register (address = 0x27) [reset = 0x1144]
      30. 8.5.30 Sync Source Control 2 Register (address = 0x28) [reset = 0x0000]
      31. 8.5.31 PAP path AB Gain Attenuation Step Register (address = 0x29) [reset = 0x0000]
      32. 8.5.32 PAP path AB Wait Time Register (address = 0x2A) [reset = 0x0000]
      33. 8.5.33 PAP path CD Gain Attenuation Step Register (address = 0x2B) [reset = 0x0000]
      34. 8.5.34 PAP Path CD Wait Time Register (address = 0x2C) [reset = 0x0000]
      35. 8.5.35 PAP path AB Configuration Register (address = 0x2D) [reset = 0x0FFF]
      36. 8.5.36 PAP path CD Configuration Register (address = 0x2E) [reset = 0x0FFF]
      37. 8.5.37 DAC SPI Configuration Register (address = 0x2F) [reset = 0x0000]
      38. 8.5.38 DAC SPI Constant Register (address = 0x30) [reset = 0x0000]
      39. 8.5.39 Gain for path AB Register (address = 0x32) [reset = 0x0000]
      40. 8.5.40 Gain for path CD Register (address = 0x33) [reset = 0x0000]
      41. 8.5.41 JESD Error Counter Register (address = 0x41) [reset = 0x0000]
      42. 8.5.42 JESD ID 1 Register (address = 0x46) [reset = 0x0044]
      43. 8.5.43 JESD ID 2 Register (address = 0x47) [reset = 0x190A]
      44. 8.5.44 JESD ID 3 and Subclass Register (address = 0x48) [reset = 0x31C3]
      45. 8.5.45 JESD Lane Enable Register (address = 0x4A) [reset = 0x0003]
      46. 8.5.46 JESD RBD Buffer and Frame Octets Register (address = 0x4B) [reset = 0x1300]
      47. 8.5.47 JESD K and L Parameters Register (address = 0x4C) [reset = 0x1303]
      48. 8.5.48 JESD M and S Parameters Register (address = 0x4D) [reset = 0x0100]
      49. 8.5.49 JESD N, HD and SCR Parameters Register (address = 0x4E) [reset = 0x0F4F]
      50. 8.5.50 JESD Character Match and Other Register (address = 0x4F) [reset = 0x1CC1]
      51. 8.5.51 JESD Link Configuration Data Register (address = 0x50) [reset = 0x0000]
      52. 8.5.52 JESD Sync Request Register (address = 0x51) [reset = 0x00FF]
      53. 8.5.53 JESD Error Output Register (address = 0x52) [reset = 0x00FF]
      54. 8.5.54 JESD ILA Check 1 Register (address = 0x53) [reset = 0x0100]
      55. 8.5.55 JESD ILA Check 2 Register (address = 0x54) [reset = 0x8E60]
      56. 8.5.56 JESD SYSREF Mode Register (address = 0x5C) [reset = 0x0001]
      57. 8.5.57 JESD Crossbar Configuration 1 Register (address = 0x5F) [reset = 0x0123]
      58. 8.5.58 JESD Crossbar Configuration 2 Register (address = 0x60) [reset = 0x4567]
      59. 8.5.59 JESD Alarms for Lane 0 Register (address = 0x64) [reset = 0x0000]
      60. 8.5.60 JESD Alarms for Lane 1 Register (address = 0x65 01100101) [reset = 0x0000]
      61. 8.5.61 JESD Alarms for Lane 2 Register (address = 0x66) [reset = 0x0000]
      62. 8.5.62 JESD Alarms for Lane 3 Register (address = 0x67) [reset = 0x0000]
      63. 8.5.63 JESD Alarms for Lane 4 Register (address = 0x68) [reset = 0x0000]
      64. 8.5.64 JESD Alarms for Lane 5 Register (address = 0x69) [reset = 0x0000]
      65. 8.5.65 JESD Alarms for Lane 6 Register (address = 0x6A [reset = 0x0000]
      66. 8.5.66 JESD Alarms for Lane 7 Register (address = 0x6B) [reset = 0x0000]
      67. 8.5.67 SYSREF and PAP Alarms Register (address = 0x6C) [reset = 0x0000]
      68. 8.5.68 Clock Divider Alarms 1 Register (address = 0x6D) [reset = 0x0000]
      69. 8.5.69 Clock Configuration Register (address = 0x0A) [reset = 0xF000]
      70. 8.5.70 Sleep Configuration Register (address = 0x0B) [reset = 0x0022]
      71. 8.5.71 Divided Output Clock Configuration Register (address = 0x0C) [reset = 0x8000]
      72. 8.5.72 DAC Fullscale Current Register (address = 0x0D) [reset = 0xF000]
      73. 8.5.73 Internal SYSREF Generator Register (address = 0x10) [reset = 0x0000]
      74. 8.5.74 Counter for Internal SYSREF Generator Register (address = 0x11) [reset = 0x0000]
      75. 8.5.75 SPI SYSREF for Internal SYSREF Generator Register (address = 0x12) [reset = 0x0000]
      76. 8.5.76 Digital Test Signals Register (address = 0x1B) [reset = 0x0000]
      77. 8.5.77 Sleep Pin Control Register (address = 0x23) [reset = 0xFFFF]
      78. 8.5.78 SYSREF Capture Circuit Control Register (address = 0x24) [reset = 0x1000]
      79. 8.5.79 Clock Input and PLL Configuration Register (address = 0x31) [reset = 0x0200]
      80. 8.5.80 PLL Configuration 1 Register (address = 0x32) [reset = 0x0308]
      81. 8.5.81 PLL Configuration 2 Register (address = 0x33) [reset = 0x4018]
      82. 8.5.82 LVDS Output Configuration Register (address = 0x34) [reset = 0x0000]
      83. 8.5.83 Fuse Farm clock divider Register (address = 0x35) [reset = 0x0018]
      84. 8.5.84 Serdes Clock Configuration Register (address = 0x3B) [reset = 0x0002]
      85. 8.5.85 Serdes PLL Configuration Register (address = 0x3C) [reset = 0x8228]
      86. 8.5.86 Serdes Configuration 1 Register (address = 0x3D) [reset = 0x0x0088]
      87. 8.5.87 Serdes Configuration 2 Register (address = 0x3E) [reset = 0x0x0909]
      88. 8.5.88 Serdes Polarity Control Register (address = 0x3F) [reset = 0x0000]
      89. 8.5.89 JESD204B SYNCB OUTPUT Register (address = 0x76) [reset = 0x0000]
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Start-up Sequence
    2. 9.2 Typical Application: Multi-band Radio Frequency Transmitter
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Calculating the JESD204B SerDes Rate
        2. 9.2.2.2 Calculating valid JESD204B SYSREF Frequency
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
    1. 10.1 Power Supply Sequencing
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Related Links
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Community Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

11 Layout

11.1 Layout Guidelines

  • DAC RF output traces
    • Single-ended 50 Ω co-planar wave guide for output traces is recommended.
    • Use short RF traces. Place DAC close to edge of PCB to shorten the length of output and clock traces. This helps to minimize PCB loss and coupling
    • Avoid width/spacing differences when entering a landing pad (eg. a balun) by tapering or by redefining width/space rules for the traces
  • Power supply planes
    • Ensure sufficient lateral spacing between two power planes (about 3x the thickness of the plane is recommended)
    • Insert ground plane between adjacent power planes where possible
      • DAC38RF86 DAC38RF96 DAC38RF87 DAC38RF97 Layout_power_SLASEA3.png Figure 156. Example Power Plane Routing
  • Bypass Capacitors
    • Use bypass capacitors with in-pad vias and place between the pin and the power plane. Avoid sharing ground vias or pads of bypass caps used for different power rails
    • Minimize stubs on bypass capacitors to avoid parasitic inductance
      • DAC38RF86 DAC38RF96 DAC38RF87 DAC38RF97 Layout_bypass_SLASEA3.png Figure 157. Bypass Capacitors Placed on the Power Supply Pin with In-pad Vias
  • High speed SerDes traces
    • Route all SerDes traces straight and minimized sharp curves or serpentines. Route for best signal integrity
    • Some skew between SerDes traces can be tolerated. It is recommended to limit skew between traces to 320ps or less
    • Place ground planes between the SerDes traces for improved isolation
      • DAC38RF86 DAC38RF96 DAC38RF87 DAC38RF97 Layout_serdes_SLASEA3.png Figure 158. Layout Example of High Speed SerDes Traces

11.2 Layout Example

DAC38RF86 DAC38RF96 DAC38RF87 DAC38RF97 Layout_example_SLASEA3.gif Figure 159. Layout Example of DAC38RFxx