SLASEA3D December   2016  – December 2023 DAC38RF80 , DAC38RF83 , DAC38RF84 , DAC38RF85 , DAC38RF90 , DAC38RF93

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 - Digital Specifications
    7. 6.7  Electrical Characteristics - AC Specifications
    8. 6.8  PLL/VCO Electrical Characteristics
    9. 6.9  Timing Requirements
    10. 6.10 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagrams
    3. 7.3 Feature Description
      1. 7.3.1  SerDes Inputs
      2. 7.3.2  SerDes Rate
      3. 7.3.3  SerDes PLL
      4. 7.3.4  SerDes Equalizer
      5. 7.3.5  JESD204B Descrambler
      6. 7.3.6  JESD204B Frame Assembly
      7. 7.3.7  SYNC Interface
      8. 7.3.8  Single or Dual Link Configuration
      9. 7.3.9  Multi-Device Synchronization
      10. 7.3.10 SYSREF Capture Circuit
      11. 7.3.11 SerDes Test Modes through Serial Programming
      12. 7.3.12 SerDes Test Modes through IEEE 1500 Programming
      13. 7.3.13 Error Counter
      14. 7.3.14 Eye Scan
      15. 7.3.15 JESD204B Pattern Test
      16. 7.3.16 Multiband DUC (multi-DUC)
        1. 7.3.16.1 Multi-DUC input
        2. 7.3.16.2 Interpolation Filters
        3. 7.3.16.3 JESD204B Modes, Interpolation and Clock phase Programming
        4. 7.3.16.4 Digital Quadrature Modulator
        5. 7.3.16.5 Low Power Coarse Resolution Mixing Modes
        6. 7.3.16.6 Inverse Sinc Filter
        7. 7.3.16.7 Summation Block for Dual DUC Modes
      17. 7.3.17 PA Protection Block
      18. 7.3.18 Gain Block
      19. 7.3.19 Output Summation
      20. 7.3.20 Output Delay
      21. 7.3.21 Polarity Inversion
      22. 7.3.22 Temperature Sensor
      23. 7.3.23 Alarm Monitoring
      24. 7.3.24 Differential Clock Inputs
      25. 7.3.25 CMOS Digital Inputs
      26. 7.3.26 DAC Fullscale Output Current
      27. 7.3.27 Current Steering DAC Architecture
      28. 7.3.28 DAC Transfer Function for DAC38RF83, 93, 85
      29. 7.3.29 DAC Transfer Function for DAC38RF80/90/84
    4. 7.4 Device Functional Modes
      1. 7.4.1 Clocking Modes
      2. 7.4.2 PLL Bypass Mode Programming
      3. 7.4.3 Internal PLL/VCO
      4. 7.4.4 CLKOUT
      5. 7.4.5 Serial Peripheral Interface (SPI)
        1. 7.4.5.1 NORMAL (RW)
        2. 7.4.5.2 WRITE_TO_CLEAR (W0C)
        3. 7.4.5.3 Writing to Reserved Bits
    5. 7.5 Register Maps
      1. 7.5.1  Chip Reset and Configuration Register (address = 0x00) [reset = 0x5803]
      2. 7.5.2  IO Configuration Register (address = 0x01) [reset = 0x1800]
      3. 7.5.3  Lane Single Detect Alarm Mask Register (address = 0x02) [reset = 0xFFFF]
      4. 7.5.4  Clock Alarms Mask Register (address = 0x03) [reset = 0xFFFF
      5. 7.5.5  SERDES Loss of Signal Detection Alarms Register (address = 0x04) [reset = 0x0000]
      6. 7.5.6  SYSREF Alignment Circuit Alarms Register (address = 0x05) [reset = variable]
      7. 7.5.7  Temperature Sensor and PLL Loop Voltage Register (address = 0x06) [reset = variable]
      8. 7.5.8  Page Set Register (address = 0x09) [reset = 0x0000]
      9. 7.5.9  SYSREF Align to r1 and r3 Count Register (address = 0x78) [reset = 0x0000]
      10. 7.5.10 SYSREF Phase Count 1 and 2 Register (address = 0x79) [reset = 0x0000]
      11. 7.5.11 SYSREF Phase Count 3 and 4 Register (address = 0x7A) [reset = 0x0000]
      12. 7.5.12 Vendor ID and Chip Version Register (address = 0x7F) [reset = 0x0009]
      13. 7.5.13 Multi-DUC Configuration (PAP, Interpolation) Register (address = 0x0A) [reset = 0x02B0]
      14. 7.5.14 Multi-DUC Configuration (Mixers) Register (address = 0x0C) [reset = 0x2402]
      15. 7.5.15 JESD FIFO Control Register (address = 0x0D)[reset = 0x8000]
      16. 7.5.16 Alarm Mask 1 Register (address = 0x0E) [reset = 0x00FF]
      17. 7.5.17 Alarm Mask 2 Register (address = 0x0F) [reset = 0xFFFF]
      18. 7.5.18 Alarm Mask 3 Register (address = 0x10) [reset = 0xFFFF]
      19. 7.5.19 Alarm Mask 4 Register (address = 0x11) [reset = 0xFFFF]
      20. 7.5.20 JESD Lane Skew Register (address = 0x12) [reset = 0x0000]
      21. 7.5.21 CMIX Configuration Register (address = 0x17) [reset = 0x0000]
      22. 7.5.22 Output Summation and Delay Register (address = 0x19) [reset = 0x0000]
      23. 7.5.23 NCO Phase Path AB Register (address = 0x1C) [reset = 0x0000]
      24. 7.5.24 NCO Phase Path CD Register (address = 0x1D) [reset = 0x0000]
      25. 7.5.25 NCO Frequency Path AB Register (address = 0x1E-0x20) [reset = 0x0000 0000 0000]
      26. 7.5.26 NCO Frequency Path CD Register (address = 0x21-0x23) [reset = 0x0000 0000 0000]
      27. 7.5.27 SYSREF Use for Clock Divider Register (address = 0x24) [reset = 0x0010]
      28. 7.5.28 Serdes Clock Control Register (address = 0x25) [reset = 0x7700]
      29. 7.5.29 Sync Source Control 1 Register (address = 0x27) [reset = 0x1144]
      30. 7.5.30 Sync Source Control 2 Register (address = 0x28) [reset = 0x0000]
      31. 7.5.31 PAP path AB Gain Attenuation Step Register (address = 0x29) [reset = 0x0000]
      32. 7.5.32 PAP path AB Wait Time Register (address = 0x2A) [reset = 0x0000]
      33. 7.5.33 PAP path CD Gain Attenuation Step Register (address = 0x2B) [reset = 0x0000]
      34. 7.5.34 PAP Path CD Wait Time Register (address = 0x2C) [reset = 0x0000]
      35. 7.5.35 PAP path AB Configuration Register (address = 0x2D) [reset = 0x0FFF]
      36. 7.5.36 PAP path CD Configuration Register (address = 0x2E) [reset = 0x0FFF]
      37. 7.5.37 DAC SPI Configuration Register (address = 0x2F) [reset = 0x0000]
      38. 7.5.38 DAC SPI Constant Register (address = 0x30) [reset = 0x0000]
      39. 7.5.39 Gain for path AB Register (address = 0x32) [reset = 0x0400]
      40. 7.5.40 Gain for path CD Register (address = 0x33) [reset = 0x0400]
      41. 7.5.41 JESD Error Counter Register (address = 0x41) [reset = 0x0000]
      42. 7.5.42 JESD ID 1 Register (address = 0x46) [reset = 0x0044]
      43. 7.5.43 JESD ID 2 Register (address = 0x47) [reset = 0x190A]
      44. 7.5.44 JESD ID 3 and Subclass Register (address = 0x48) [reset = 0x31C3]
      45. 7.5.45 JESD Lane Enable Register (address = 0x4A) [reset = 0x0003]
      46. 7.5.46 JESD RBD Buffer and Frame Octets Register (address = 0x4B) [reset = 0x1300]
      47. 7.5.47 JESD K and L Parameters Register (address = 0x4C) [reset = 0x1303]
      48. 7.5.48 JESD M and S Parameters Register (address = 0x4D) [reset = 0x0100]
      49. 7.5.49 JESD N, HD and SCR Parameters Register (address = 0x4E) [reset = 0x0F4F]
      50. 7.5.50 JESD Character Match and Other Register (address = 0x4F) [reset = 0x1CC1]
      51. 7.5.51 JESD Link Configuration Data Register (address = 0x50) [reset = 0x0000]
      52. 7.5.52 JESD Sync Request Register (address = 0x51) [reset = 0x00FF]
      53. 7.5.53 JESD Error Output Register (address = 0x52) [reset = 0x00FF]
      54. 7.5.54 JESD ILA Check 1 Register (address = 0x53) [reset = 0x0100]
      55. 7.5.55 JESD ILA Check 2 Register (address = 0x54) [reset = 0x8E60]
      56. 7.5.56 JESD SYSREF Mode Register (address = 0x5C) [reset = 0x0001]
      57. 7.5.57 JESD Crossbar Configuration 1 Register (address = 0x5F) [reset = 0x0123]
      58. 7.5.58 JESD Crossbar Configuration 2 Register (address = 0x60) [reset = 0x4567]
      59. 7.5.59 JESD Alarms for Lane 0 Register (address = 0x64) [reset = 0x0000]
      60. 7.5.60 JESD Alarms for Lane 1 Register (address = 0x65) [reset = 0x0000]
      61. 7.5.61 JESD Alarms for Lane 2 Register (address = 0x66) [reset = 0x0000]
      62. 7.5.62 JESD Alarms for Lane 3 Register (address = 0x67) [reset = 0x0000]
      63. 7.5.63 JESD Alarms for Lane 4 Register (address = 0x68) [reset = 0x0000]
      64. 7.5.64 JESD Alarms for Lane 5 Register (address = 0x69) [reset = 0x0000]
      65. 7.5.65 JESD Alarms for Lane 6 Register (address = 0x6A [reset = 0x0000]
      66. 7.5.66 JESD Alarms for Lane 7 Register (address = 0x6B) [reset = 0x0000]
      67. 7.5.67 SYSREF and PAP Alarms Register (address = 0x6C) [reset = 0x0000]
      68. 7.5.68 Clock Divider Alarms 1 Register (address = 0x6D) [reset = 0x0000]
      69. 7.5.69 Clock Configuration Register (address = 0x0A) [reset = 0xFC03]
      70. 7.5.70 Sleep Configuration Register (address = 0x0B) [reset = 0x0022]
      71. 7.5.71 Divided Output Clock Configuration Register (address = 0x0C) [reset = 0x2002]
      72. 7.5.72 DAC Fullscale Current Register (address = 0x0D) [reset = 0xF000]
      73. 7.5.73 Internal SYSREF Generator Register (address = 0x10) [reset = 0x0000]
      74. 7.5.74 Counter for Internal SYSREF Generator Register (address = 0x11) [reset = 0x0000]
      75. 7.5.75 SPI SYSREF for Internal SYSREF Generator Register (address = 0x12) [reset = 0x0000]
      76. 7.5.76 Digital Test Signals Register (address = 0x1B) [reset = 0x0000]
      77. 7.5.77 Sleep Pin Control Register (address = 0x23) [reset = 0xFFFF]
      78. 7.5.78 SYSREF Capture Circuit Control Register (address = 0x24) [reset = 0x1000]
      79. 7.5.79 Clock Input and PLL Configuration Register (address = 0x31) [reset = 0x0200]
      80. 7.5.80 PLL Configuration 1 Register (address = 0x32) [reset = 0x0308]
      81. 7.5.81 PLL Configuration 2 Register (address = 0x33) [reset = 0x4018]
      82. 7.5.82 LVDS Output Configuration Register (address = 0x34) [reset = 0x0000]
      83. 7.5.83 Fuse Farm clock divider Register (address = 0x35) [reset = 0x0018]
      84. 7.5.84 Serdes Clock Configuration Register (address = 0x3B) [reset = 0x1802]
      85. 7.5.85 Serdes PLL Configuration Register (address = 0x3C) [reset = 0x8228]
      86. 7.5.86 Serdes Configuration 1 Register (address = 0x3D) [reset = 0x0x0088]
      87. 7.5.87 Serdes Configuration 2 Register (address = 0x3E) [reset = 0x0x0909]
      88. 7.5.88 Serdes Polarity Control Register (address = 0x3F) [reset = 0x0000]
      89. 7.5.89 JESD204B SYNCB OUTPUT Register (address = 0x76) [reset = 0x0000]
  9. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Start-up Sequence
    2. 8.2 Typical Application: Multi-band Radio Frequency Transmitter
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Calculating the JESD204B SerDes Rate
        2. 8.2.2.2 Calculating valid JESD204B SYSREF Frequency
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
      1. 8.3.1 Power Supply Sequencing
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout 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

7.3.6 JESD204B Frame Assembly

The DAC38RFxx may be programmed as a single or dual DAC device, with one JESD RX block designated for each DAC. The two JESD RX blocks can be programmed to operate as two separate links or as a single link.

The JESD204B defines the following parameters:

  • L is the number of lanes
  • M is the number of I or Q streams per device (2 = 1 IQ pair, 4 = 2 IQ pairs, 8 = 4 IQ pairs)
  • F is the number of octets per frame clock period
  • S is the number of samples per frame
  • HD is the High-Density bit which controls whether a sample may be divided over more lanes
  • N = NPRIME is the number of bits per sample (12 or 16 - bits)

Fields K and L are found in multi-DUC paged register JESD_K_L (8.5.46), M and S in multi-DUC paged register JESD_M_S (8.5.48), and N, NPRIME and HD in multi-DUC paged register JESD_N_HD_SCR (8.5.49).

Table 7-9 lists the available JESD204B formats, interpolation rates and sample rate limits for the DAC38RFxx. The ranges are limited by the SerDes PLL VCO frequency range, the SerDes PLL reference clock range, the maximum SerDes line rate, and the maximum DAC sample frequency. Table 7-10 through Table 7-22 lists the frame formats for each mode. In the frame format tables, i CH (N) [x:y] and q CH (N) [x:y] are bits x through y of the I and Q samples at time N of DUC channel CH. If [x..y] is not listed, the full sample is assumed. For example, i0(0)[15:8] are bits 15 – 8 of the I sample at time 0 of DUC #0, and q1(1) is the full Q sample at time 1 of DUC #1.

Table 7-9 JESD204B Formats for DAC38RFxx
L-M-F-S-Hd
1 TX		 L-M-F-S-Hd
2 TX		 Frame Format Input Resolution IQ Pairs Per DAC Interp Input Rate Max (MSPS) fDAC Max
(MSPS)		 DAC38RF83, DAC38RF80 DAC38RF93, DAC38RF90 DAC38RF85, DAC38RF84
(1 TX only)
82121 NA 1 TX: Table 7-10 16 1 6 1250 7500 √ √
16 1 8 1125 9000 √ √
16 1 12 750 9000 √ √ √
16 1 16 562.5 9000 √ √ √
42111 84111 1 TX: Table 7-11
2 TX: Table 7-12		 16 1 6 1250 7500 √ √
16 1 8 1125 9000 √ √
16 1 10 900 9000 √ √
16 1 12 750 9000 √ √ √
16 1 16 562.5 9000 √ √ √
16 1 18 500 9000 √ √ √
16 1 24 375 9000 √ √ √
22210 44210 1 TX: Table 7-13
2 TX: Table 7-14		 16 1 8 625 5000 √ √
16 1 12 625 7500 √ √ √
16 1 16 562.5 9000 √ √ √
16 1 18 500 9000 √ √ √
16 1 20 450 9000 √ √ √
16 1 24 375 9000 √ √ √
12410 24410 1 TX: Table 7-15
2 TX: Table 7-16		 16 1 16 312.5 5000 √ √ √
16 1 24 312.5 7500 √ √ √
44210 88210 1 TX: Table 7-17
2 TX: Table 7-18		 16 2 8 625 5000 √ √
16 2 12 625 7500 √ √
16 2 16 562.5 9000 √ √
16 2 24 375 9000 √ √
24410 48410 1 TX: Table 7-19
2 TX: Table 7-20		 16 2 16 312.5 5000 √ √
16 2 24 312.5 7500 √ √
24310 48310 1 TX: Table 7-21
2 TX: Table 7-22		 12 2 24 375 9000 √ √
Table 7-10 JESD204B Frame Format for LMFSHd = 82121
# un bits 4 8
# en bits 5 10
Nibble 1 2
lane RX0 i0[15:8]
lane RX1 i0[7:0]
lane RX2 i1[15:8]
lane RX3 i1[7:0]
lane RX4 q0[15:8]
lane RX5 q0[7:0]
lane RX6 q1[15:8]
lane RX7 q1[7:0]
Table 7-11 JESD204B Frame Format for LMFSHd = 42111
# un bits 4 8
# en bits 5 10
Nibble 1 2
lane RX0 i0[15:8]
lane RX1 i0[7:0]
lane RX2 q0[15:8]
lane RX3 q0[7:0]
Table 7-12 JESD204B Frame Format for LMFSHd = 84111
# un bits 4 8
# en bits 5 10
Nibble 1 2
lane RX0 A-i0[15:8](1)
lane RX1 A-i0[7:0](2)
lane RX2 A-q0[15:8]
lane RX3 A-q0[7:0]
lane RX4 B-i0[15:8]
lane RX5 B-i0[7:0]
lane RX6 B-q0[15:8]
lane RX7 B-q0[7:0]
(1) DAC A, I sample 0, MSB byte
(2) DAC A, I sample 0, LSB byte
Table 7-13 JESD204B Frame Format for LMFSHd = 22210
# un bits 4 8 12 16
# en bits 5 10 15 20
Nibble 1 2 3 4
lane RX0 i0
lane RX1 q0
Table 7-14 JESD204B Frame Format for LMFSHd = 44210
# un bits 4 8 12 16
# en bits 5 10 15 20
Nibble 1 2 3 4
lane RX0 A-i0(1)
lane RX1 A-q0
lane RX2 B-i0
lane RX3 B-q0
(1) DAC A, I sample 0
Table 7-15 JESD204B Frame Format for LMFSHd = 12410
# un bits 4 8 12 16 20 24 28 32
# en bits 5 10 15 20 25 30 35 40
Nibble 1 2 3 4 5 6 7 8
lane RX0 i0 q0
Table 7-16 JESD204B Frame Format for LMFSHd = 24410
# un bits 4 8 12 16 20 24 28 32
# en bits 5 10 15 20 25 30 35 40
Nibble 1 2 3 4 5 6 7 8
lane RX0 A-i0(1) A-q0
lane RX1 B-i0 B-q0
(1) DAC A, I sample 0
Table 7-17 JESD204B Frame Format for LMFSHd = 44210
# un bits 4 8 12 16
# en bits 5 10 15 20
Nibble 1 2 3 4
lane RX0 A1-i0(1)
lane RX1 A1-q0(2)
lane RX2 A2-i0
lane RX3 A2-q0
(1) DAC A, MultiDUC 1, I sample 0
(2) DAC A, MultiDUC 2, I sample 0
Table 7-18 JESD204B Frame Format for LMFSHd = 88210
# un bits 4 8 12 16
# en bits 5 10 15 20
Nibble 1 2 3 4
lane RX0 A1-i0(1)
lane RX1 A1-q0
lane RX2 A2-i0
lane RX3 A2-q0
lane RX4 B1-i0
lane RX5 B1-q0
lane RX6 B2-i0
lane RX7 B1-q0
(1) DAC A, MultiDUC 1, I sample 0
Table 7-19 JESD204B Frame Format for LMFSHd = 24410
# un bits 4 8 12 16 20 24 28 32
# en bits 5 10 15 20 25 30 35 40
Nibble 1 2 3 4 5 6 7 8
lane RX0 A1-i0(1) A1-q0
lane RX1 A2-i0 A2-q0
(1) DAC A, MultiDUC 1, I sample 0
Table 7-20 JESD204B Frame Format for LMFSHd = 48410
# un bits 4 8 12 16 20 24 28 32
# en bits 5 10 15 20 25 30 35 40
Nibble 1 2 3 4 5 6 7 8
lane RX0 A1-i0(1) A1-q0
lane RX1 A2-i0 A2-q0
lane RX2 B1-i0 B1-q0
lane RX3 B2-i0 B2-q0
(1) DAC A, MultiDUC 1, I sample 0
Table 7-21 JESD204B Frame Format for LMFSHd = 24310
# un bits 4 8 12 16 20 24
# en bits 5 10 15 20 25 30
Nibble 1 2 3 4 5 6
lane RX0 A1-i0(1) A1-q0
lane RX1 A2-i0 A2-q0
(1) DAC A, MultiDUC 1, I sample 0
Table 7-22 JESD204B Frame Format for LMFSHd = 48310
# un bits 4 8 12 16 20 24
# en bits 5 10 15 20 25 30
Nibble 1 2 3 4 5 6
lane RX0 A1-i0(1) A1-q0
lane RX1 A2-i0 A2-q0
lane RX2 B1-i0 B1-q0
lane RX3 B2-i0 B2-q0
(1) DAC A, MultiDUC 1, I sample 0