JAJSEY1 April   2019 ADC12DJ5200RF

ADVANCE INFORMATION for pre-production products; subject to change without notice.  

  1. 特長
  2. アプリケーション
  3. 概要
    1.     ADC12DJ5200RF ブロック図
  4. 改訂履歴
  5. 概要 (続き)
  6. Pin Configuration and Functions
    1.     Pin Functions
  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: Power Consumption
    7. 7.7  Electrical Characteristics: AC Specifications (Dual-Channel Mode)
    8. 7.8  Electrical Characteristics: AC Specifications (Single-Channel Mode)
    9. 7.9  Timing Requirements
    10. 7.10 Switching Characteristics
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Device Comparison
      2. 8.3.2 Analog Inputs
        1. 8.3.2.1 Analog Input Protection
        2. 8.3.2.2 Full-Scale Voltage (VFS) Adjustment
        3. 8.3.2.3 Analog Input Offset Adjust
      3. 8.3.3 ADC Core
        1. 8.3.3.1 ADC Theory of Operation
        2. 8.3.3.2 ADC Core Calibration
        3. 8.3.3.3 Analog Reference Voltage
        4. 8.3.3.4 ADC Overrange Detection
        5. 8.3.3.5 Code Error Rate (CER)
      4. 8.3.4 Temperature Monitoring Diode
      5. 8.3.5 Timestamp
      6. 8.3.6 Clocking
        1. 8.3.6.1 Noiseless Aperture Delay Adjustment (tAD Adjust)
        2. 8.3.6.2 Aperture Delay Ramp Control (TAD_RAMP)
        3. 8.3.6.3 SYSREF Capture for Multi-Device Synchronization and Deterministic Latency
          1. 8.3.6.3.1 SYSREF Position Detector and Sampling Position Selection (SYSREF Windowing)
          2. 8.3.6.3.2 Automatic SYSREF Calibration
      7. 8.3.7 Digital Down Converters (DDC)
        1. 8.3.7.1 Numerically-Controlled Oscillator and Complex Mixer
          1. 8.3.7.1.1 NCO Fast Frequency Hopping (FFH)
          2. 8.3.7.1.2 NCO Selection
          3. 8.3.7.1.3 Basic NCO Frequency Setting Mode
          4. 8.3.7.1.4 Rational NCO Frequency Setting Mode
          5. 8.3.7.1.5 NCO Phase Offset Setting
          6. 8.3.7.1.6 NCO Phase Synchronization
        2. 8.3.7.2 Decimation Filters
        3. 8.3.7.3 Output Data Format
        4. 8.3.7.4 Decimation Settings
          1. 8.3.7.4.1 Decimation Factor
          2. 8.3.7.4.2 DDC Gain Boost
      8. 8.3.8 JESD204C Interface
        1. 8.3.8.1 Transport Layer
        2. 8.3.8.2 Scrambler
        3. 8.3.8.3 Link Layer
        4. 8.3.8.4 8B/10B Link Layer
          1. 8.3.8.4.1 Data Encoding (8B/10B)
          2. 8.3.8.4.2 Multiframes and the Local Multiframe Clock (LMFC)
          3. 8.3.8.4.3 Code Group Synchronization (CGS)
          4. 8.3.8.4.4 Initial Lane Alignment Sequence (ILAS)
          5. 8.3.8.4.5 Frame and Multiframe Monitoring
        5. 8.3.8.5 64B/66B Link Layer
          1. 8.3.8.5.1 64B/66B Encoding
          2. 8.3.8.5.2 Multiblocks, Extended Multiblocks and the Local Extended Multiblock Clock (LEMC)
          3. 8.3.8.5.3 Block, Multiblock and Extended Multiblock Alignment using Sync Header
            1. 8.3.8.5.3.1 Cyclic Redundancy Check (CRC) Mode
            2. 8.3.8.5.3.2 Forward Error Correction (FEC) Mode
          4. 8.3.8.5.4 Initial Lane Alignment
          5. 8.3.8.5.5 Block, Multiblock and Extended Multiblock Alignment Monitoring
        6. 8.3.8.6 Physical Layer
          1. 8.3.8.6.1 SerDes Pre-Emphasis
        7. 8.3.8.7 JESD204C Enable
        8. 8.3.8.8 Multi-Device Synchronization and Deterministic Latency
        9. 8.3.8.9 Operation in Subclass 0 Systems
      9. 8.3.9 Alarm Monitoring
        1. 8.3.9.1 NCO Upset Detection
        2. 8.3.9.2 Clock Upset Detection
        3. 8.3.9.3 FIFO Upset Detection
    4. 8.4 Device Functional Modes
      1. 8.4.1 Dual-Channel Mode
      2. 8.4.2 Single-Channel Mode (DES Mode)
      3. 8.4.3 JESD204C Modes
        1. 8.4.3.1 JESD204C Transport Layer Data Formats
        2. 8.4.3.2 64B/66B Sync Header Stream Configuration
        3. 8.4.3.3 Dual DDC and Redundant Data Mode
      4. 8.4.4 Power-Down Modes
      5. 8.4.5 Test Modes
        1. 8.4.5.1 Serializer Test-Mode Details
        2. 8.4.5.2 PRBS Test Modes
        3. 8.4.5.3 Clock Pattern Mode
        4. 8.4.5.4 Ramp Test Mode
        5. 8.4.5.5 Short and Long Transport Test Mode
          1. 8.4.5.5.1 Short Transport Test Pattern
          2. 8.4.5.5.2 Long Transport Test Pattern
        6. 8.4.5.6 D21.5 Test Mode
        7. 8.4.5.7 K28.5 Test Mode
        8. 8.4.5.8 Repeated ILA Test Mode
        9. 8.4.5.9 Modified RPAT Test Mode
      6. 8.4.6 Calibration Modes and Trimming
        1. 8.4.6.1 Foreground Calibration Mode
        2. 8.4.6.2 Background Calibration Mode
        3. 8.4.6.3 Low-Power Background Calibration (LPBG) Mode
      7. 8.4.7 Offset Calibration
      8. 8.4.8 Trimming
    5. 8.5 Programming
      1. 8.5.1 Using the Serial Interface
        1. 8.5.1.1 SCS
        2. 8.5.1.2 SCLK
        3. 8.5.1.3 SDI
        4. 8.5.1.4 SDO
        5. 8.5.1.5 Streaming Mode
    6. 8.6 SPI_Register_Map Registers
      1. 8.6.1   CONFIG_A Register (Address = 0x0) [reset = 0x30]
        1. Table 60. CONFIG_A Register Field Descriptions
      2. 8.6.2   DEVICE_CONFIG Register (Address = 0x2) [reset = 0x00]
        1. Table 61. DEVICE_CONFIG Register Field Descriptions
      3. 8.6.3   CHIP_TYPE Register (Address = 0x3) [reset = 0x03]
        1. Table 62. CHIP_TYPE Register Field Descriptions
      4. 8.6.4   CHIP_ID Register (Address = 0x4) [reset = 0x0]
        1. Table 63. CHIP_ID Register Field Descriptions
      5. 8.6.5   VENDOR_ID Register (Address = 0xC) [reset = 0x0]
        1. Table 64. VENDOR_ID Register Field Descriptions
      6. 8.6.6   USR0 Register (Address = 0x10) [reset = 0x00]
        1. Table 65. USR0 Register Field Descriptions
      7. 8.6.7   CLK_CTRL0 Register (Address = 0x29) [reset = 0x00]
        1. Table 66. CLK_CTRL0 Register Field Descriptions
      8. 8.6.8   CLK_CTRL1 Register (Address = 0x2A) [reset = 0x00]
        1. Table 67. CLK_CTRL1 Register Field Descriptions
      9. 8.6.9   SYSREF_POS Register (Address = 0x2C) [reset = 0x0]
        1. Table 68. SYSREF_POS Register Field Descriptions
      10. 8.6.10  FS_RANGE_A Register (Address = 0x30) [reset = 0x0]
        1. Table 69. FS_RANGE_A Register Field Descriptions
      11. 8.6.11  FS_RANGE_B Register (Address = 0x32) [reset = 0x0]
        1. Table 70. FS_RANGE_B Register Field Descriptions
      12. 8.6.12  BG_BYPASS Register (Address = 0x38) [reset = 0x00]
        1. Table 71. BG_BYPASS Register Field Descriptions
      13. 8.6.13  TMSTP_CTRL Register (Address = 0x3B) [reset = 0x00]
        1. Table 72. TMSTP_CTRL Register Field Descriptions
      14. 8.6.14  SER_PE Register (Address = 0x48) [reset = 0x00]
        1. Table 73. SER_PE Register Field Descriptions
      15. 8.6.15  INPUT_MUX Register (Address = 0x60) [reset = 0x01]
        1. Table 74. INPUT_MUX Register Field Descriptions
      16. 8.6.16  CAL_EN Register (Address = 0x61) [reset = 0x01]
        1. Table 75. CAL_EN Register Field Descriptions
      17. 8.6.17  CAL_CFG0 Register (Address = 0x62) [reset = 0x01]
        1. Table 76. CAL_CFG0 Register Field Descriptions
      18. 8.6.18  CAL_AVG Register (Address = 0x68) [reset = 0x61]
        1. Table 77. CAL_AVG Register Field Descriptions
      19. 8.6.19  CAL_STATUS Register (Address = 0x6A) [reset = 0x0]
        1. Table 78. CAL_STATUS Register Field Descriptions
      20. 8.6.20  CAL_PIN_CFG Register (Address = 0x6B) [reset = 0x00]
        1. Table 79. CAL_PIN_CFG Register Field Descriptions
      21. 8.6.21  CAL_SOFT_TRIG Register (Address = 0x6C) [reset = 0x01]
        1. Table 80. CAL_SOFT_TRIG Register Field Descriptions
      22. 8.6.22  CAL_LP Register (Address = 0x6E) [reset = 0x88]
        1. Table 81. CAL_LP Register Field Descriptions
      23. 8.6.23  CAL_DATA_EN Register (Address = 0x70) [reset = 0x00]
        1. Table 82. CAL_DATA_EN Register Field Descriptions
      24. 8.6.24  CAL_DATA Register (Address = 0x71) [reset = 0x0]
        1. Table 83. CAL_DATA Register Field Descriptions
      25. 8.6.25  GAIN_TRIM_A Register (Address = 0x7A) [reset = 0x0]
        1. Table 84. GAIN_TRIM_A Register Field Descriptions
      26. 8.6.26  GAIN_TRIM_B Register (Address = 0x7B) [reset = 0x0]
        1. Table 85. GAIN_TRIM_B Register Field Descriptions
      27. 8.6.27  BG_TRIM Register (Address = 0x7C) [reset = 0x0]
        1. Table 86. BG_TRIM Register Field Descriptions
      28. 8.6.28  RTRIM_A Register (Address = 0x7E) [reset = 0x0]
        1. Table 87. RTRIM_A Register Field Descriptions
      29. 8.6.29  RTRIM_B Register (Address = 0x7F) [reset = 0x0]
        1. Table 88. RTRIM_B Register Field Descriptions
      30. 8.6.30  ADC_DITH Register (Address = 0x9D) [reset = 0x0]
        1. Table 89. ADC_DITH Register Field Descriptions
      31. 8.6.31  B0_TIME_0 Register (Address = 0x102) [reset = 0x0]
        1. Table 90. B0_TIME_0 Register Field Descriptions
      32. 8.6.32  B0_TIME_90 Register (Address = 0x103) [reset = 0x0]
        1. Table 91. B0_TIME_90 Register Field Descriptions
      33. 8.6.33  B1_TIME_0 Register (Address = 0x112) [reset = 0x0]
        1. Table 92. B1_TIME_0 Register Field Descriptions
      34. 8.6.34  B1_TIME_90 Register (Address = 0x113) [reset = 0x0]
        1. Table 93. B1_TIME_90 Register Field Descriptions
      35. 8.6.35  B4_TIME_0 Register (Address = 0x142) [reset = 0x0]
        1. Table 94. B4_TIME_0 Register Field Descriptions
      36. 8.6.36  B5_TIME_0 Register (Address = 0x152) [reset = 0x0]
        1. Table 95. B5_TIME_0 Register Field Descriptions
      37. 8.6.37  LSB_CTRL Register (Address = 0x160) [reset = 0x00]
        1. Table 96. LSB_CTRL Register Field Descriptions
      38. 8.6.38  JESD_EN Register (Address = 0x200) [reset = 0x01]
        1. Table 97. JESD_EN Register Field Descriptions
      39. 8.6.39  JMODE Register (Address = 0x201) [reset = 0x02]
        1. Table 98. JMODE Register Field Descriptions
      40. 8.6.40  KM1 Register (Address = 0x202) [reset = 0x1]
        1. Table 99. KM1 Register Field Descriptions
      41. 8.6.41  JSYNC_N Register (Address = 0x203) [reset = 0x01]
        1. Table 100. JSYNC_N Register Field Descriptions
      42. 8.6.42  JCTRL Register (Address = 0x204) [reset = 0x02]
        1. Table 101. JCTRL Register Field Descriptions
      43. 8.6.43  JTEST Register (Address = 0x205) [reset = 0x00]
        1. Table 102. JTEST Register Field Descriptions
      44. 8.6.44  DID Register (Address = 0x206) [reset = 0x00]
        1. Table 103. DID Register Field Descriptions
      45. 8.6.45  FCHAR Register (Address = 0x207) [reset = 0x00]
        1. Table 104. FCHAR Register Field Descriptions
      46. 8.6.46  JESD_STATUS Register (Address = 0x208) [reset = 0x0]
        1. Table 105. JESD_STATUS Register Field Descriptions
      47. 8.6.47  PD_CH Register (Address = 0x209) [reset = 0x00]
        1. Table 106. PD_CH Register Field Descriptions
      48. 8.6.48  JEXTRA_A Register (Address = 0x20A) [reset = 0x00]
        1. Table 107. JEXTRA_A Register Field Descriptions
      49. 8.6.49  JEXTRA_B Register (Address = 0x20B) [reset = 0x00]
        1. Table 108. JEXTRA_B Register Field Descriptions
      50. 8.6.50  SHMODE Register (Address = 0x20F) [reset = 0x00]
        1. Table 109. SHMODE Register Field Descriptions
      51. 8.6.51  DDC_CFG Register (Address = 0x210) [reset = 0x00]
        1. Table 110. DDC_CFG Register Field Descriptions
      52. 8.6.52  OVR_T0 Register (Address = 0x211) [reset = 0x0]
        1. Table 111. OVR_T0 Register Field Descriptions
      53. 8.6.53  OVR_T1 Register (Address = 0x212) [reset = 0x0]
        1. Table 112. OVR_T1 Register Field Descriptions
      54. 8.6.54  OVR_CFG Register (Address = 0x213) [reset = 0x07]
        1. Table 113. OVR_CFG Register Field Descriptions
      55. 8.6.55  CMODE Register (Address = 0x214) [reset = 0x00]
        1. Table 114. CMODE Register Field Descriptions
      56. 8.6.56  CSEL Register (Address = 0x215) [reset = 0x00]
        1. Table 115. CSEL Register Field Descriptions
      57. 8.6.57  DIG_BIND Register (Address = 0x216) [reset = 0x02]
        1. Table 116. DIG_BIND Register Field Descriptions
      58. 8.6.58  NCO_RDIV Register (Address = 0x217) [reset = 0x0000]
        1. Table 117. NCO_RDIV Register Field Descriptions
      59. 8.6.59  NCO_SYNC Register (Address = 0x219) [reset = 0x02]
        1. Table 118. NCO_SYNC Register Field Descriptions
      60. 8.6.60  FREQA0 Register (Address = 0x220) [reset = 0x0]
        1. Table 119. FREQA0 Register Field Descriptions
      61. 8.6.61  PHASEA0 Register (Address = 0x224) [reset = 0x0000]
        1. Table 120. PHASEA0 Register Field Descriptions
      62. 8.6.62  FREQA1 Register (Address = 0x228) [reset = 0x0]
        1. Table 121. FREQA1 Register Field Descriptions
      63. 8.6.63  PHASEA1 Register (Address = 0x22C) [reset = 0x0000]
        1. Table 122. PHASEA1 Register Field Descriptions
      64. 8.6.64  FREQA2 Register (Address = 0x230) [reset = 0x0]
        1. Table 123. FREQA2 Register Field Descriptions
      65. 8.6.65  PHASEA2 Register (Address = 0x234) [reset = 0x0000]
        1. Table 124. PHASEA2 Register Field Descriptions
      66. 8.6.66  FREQA3 Register (Address = 0x238) [reset = 0x0]
        1. Table 125. FREQA3 Register Field Descriptions
      67. 8.6.67  PHASEA3 Register (Address = 0x23C) [reset = 0x0000]
        1. Table 126. PHASEA3 Register Field Descriptions
      68. 8.6.68  FREQB0 Register (Address = 0x240) [reset = 0x0]
        1. Table 127. FREQB0 Register Field Descriptions
      69. 8.6.69  PHASEB0 Register (Address = 0x244) [reset = 0x0000]
        1. Table 128. PHASEB0 Register Field Descriptions
      70. 8.6.70  FREQB1 Register (Address = 0x248) [reset = 0x0]
        1. Table 129. FREQB1 Register Field Descriptions
      71. 8.6.71  PHASEB1 Register (Address = 0x24C) [reset = 0x0000]
        1. Table 130. PHASEB1 Register Field Descriptions
      72. 8.6.72  FREQB2 Register (Address = 0x250) [reset = 0x0]
        1. Table 131. FREQB2 Register Field Descriptions
      73. 8.6.73  PHASEB2 Register (Address = 0x254) [reset = 0x0000]
        1. Table 132. PHASEB2 Register Field Descriptions
      74. 8.6.74  FREQB3 Register (Address = 0x258) [reset = 0x0]
        1. Table 133. FREQB3 Register Field Descriptions
      75. 8.6.75  PHASEB3 Register (Address = 0x25C) [reset = 0x0000]
        1. Table 134. PHASEB3 Register Field Descriptions
      76. 8.6.76  SPIN_ID Register (Address = 0x297) [reset = 0x0]
        1. Table 135. SPIN_ID Register Field Descriptions
      77. 8.6.77  SRC_EN Register (Address = 0x2B0) [reset = 0x00]
        1. Table 136. SRC_EN Register Field Descriptions
      78. 8.6.78  SRC_CFG Register (Address = 0x2B1) [reset = 0x05]
        1. Table 137. SRC_CFG Register Field Descriptions
      79. 8.6.79  SRC_STATUS Register (Address = 0x2B2) [reset = 0x0]
        1. Table 138. SRC_STATUS Register Field Descriptions
      80. 8.6.80  TAD Register (Address = 0x2B5) [reset = 0x00]
        1. Table 139. TAD Register Field Descriptions
      81. 8.6.81  TAD_RAMP Register (Address = 0x2B8) [reset = 0x00]
        1. Table 140. TAD_RAMP Register Field Descriptions
      82. 8.6.82  ALARM Register (Address = 0x2C0) [reset = 0x0]
        1. Table 141. ALARM Register Field Descriptions
      83. 8.6.83  ALM_STATUS Register (Address = 0x2C1) [reset = 0x3]
        1. Table 142. ALM_STATUS Register Field Descriptions
      84. 8.6.84  ALM_MASK Register (Address = 0x2C2) [reset = 0x3]
        1. Table 143. ALM_MASK Register Field Descriptions
      85. 8.6.85  FIFO_LANE_ALM Register (Address = 0x2C4) [reset = 0x0]
        1. Table 144. FIFO_LANE_ALM Register Field Descriptions
      86. 8.6.86  TADJ_A Register (Address = 0x310) [reset = 0x0]
        1. Table 145. TADJ_A Register Field Descriptions
      87. 8.6.87  TADJ_B Register (Address = 0x313) [reset = 0x0]
        1. Table 146. TADJ_B Register Field Descriptions
      88. 8.6.88  TADJ_A_FG90_VINA Register (Address = 0x314) [reset = 0x0]
        1. Table 147. TADJ_A_FG90_VINA Register Field Descriptions
      89. 8.6.89  TADJ_B_FG0_VINA Register (Address = 0x315) [reset = 0x0]
        1. Table 148. TADJ_B_FG0_VINA Register Field Descriptions
      90. 8.6.90  TADJ_A_FG90_VINB Register (Address = 0x31A) [reset = 0x0]
        1. Table 149. TADJ_A_FG90_VINB Register Field Descriptions
      91. 8.6.91  TADJ_B_FG0_VINB Register (Address = 0x31B) [reset = 0x0]
        1. Table 150. TADJ_B_FG0_VINB Register Field Descriptions
      92. 8.6.92  OADJ_A_FG0_VINA Register (Address = 0x344) [reset = 0x0]
        1. Table 151. OADJ_A_FG0_VINA Register Field Descriptions
      93. 8.6.93  OADJ_A_FG0_VINB Register (Address = 0x346) [reset = 0x0]
        1. Table 152. OADJ_A_FG0_VINB Register Field Descriptions
      94. 8.6.94  OADJ_A_FG90_VINA Register (Address = 0x348) [reset = 0x0]
        1. Table 153. OADJ_A_FG90_VINA Register Field Descriptions
      95. 8.6.95  OADJ_A_FG90_VINB Register (Address = 0x34A) [reset = 0x0]
        1. Table 154. OADJ_A_FG90_VINB Register Field Descriptions
      96. 8.6.96  OADJ_B_FG0_VINA Register (Address = 0x34C) [reset = 0x0]
        1. Table 155. OADJ_B_FG0_VINA Register Field Descriptions
      97. 8.6.97  OADJ_B_FG0_VINB Register (Address = 0x34E) [reset = 0x0]
        1. Table 156. OADJ_B_FG0_VINB Register Field Descriptions
      98. 8.6.98  GAIN_B0 Register (Address = 0x360) [reset = 0x0]
        1. Table 157. GAIN_B0 Register Field Descriptions
      99. 8.6.99  GAIN_B1 Register (Address = 0x361) [reset = 0x0]
        1. Table 158. GAIN_B1 Register Field Descriptions
      100. 8.6.100 GAIN_B4 Register (Address = 0x364) [reset = 0x0]
        1. Table 159. GAIN_B4 Register Field Descriptions
      101. 8.6.101 GAIN_B5 Register (Address = 0x365) [reset = 0x0]
        1. Table 160. GAIN_B5 Register Field Descriptions
  9. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Wideband RF Sampling Receiver
        1. 9.2.1.1 Design Requirements
          1. 9.2.1.1.1 Input Signal Path
          2. 9.2.1.1.2 Clocking
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Calculating Values of AC-Coupling Capacitors
      2. 9.2.2 Reconfigurable Dual-Channel 5-GSPS or Single-Channel 10-Gsps Oscilloscope
        1. 9.2.2.1 Design Requirements
          1. 9.2.2.1.1 Input Signal Path
          2. 9.2.2.1.2 Clocking
          3. 9.2.2.1.3 ADC12DJ5200RF
    3. 9.3 Initialization Set Up
  10. 10Power Supply Recommendations
    1. 10.1 Power Sequencing
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12デバイスおよびドキュメントのサポート
    1. 12.1 デバイス・サポート
      1. 12.1.1 デベロッパー・ネットワークの製品に関する免責事項
      2. 12.1.2 開発サポート
    2. 12.2 ドキュメントのサポート
      1. 12.2.1 関連資料
    3. 12.3 ドキュメントの更新通知を受け取る方法
    4. 12.4 コミュニティ・リソース
    5. 12.5 商標
    6. 12.6 静電気放電に関する注意事項
    7. 12.7 Glossary
  13. 13メカニカル、パッケージ、および注文情報

パッケージ・オプション

メカニカル・データ(パッケージ|ピン)
サーマルパッド・メカニカル・データ
発注情報

Decimation Filters

The decimation filters are arranged to provide a programmable overall decimation of 4 or 8. All decimation filters operate on complex data (from the complex digital mixer) and the outputs have a resolution of 15 bits. The decimation filters are implemented as linear phase finite impulse response (FIR) filters. Table 11 lists the effective output sample rates, available signal bandwidths, output formats, and stop-band attenuation for each decimation mode.

Table 11. Output Sample Rates and Signal Bandwidths

DECIMATION SETTING ƒ(DEVCLK) OUTPUT FORMAT
OUTPUT RATE (MSPS) MAX ALIAS PROTECTED SIGNAL BANDWIDTH (MHz) STOP-BAND ATTENUATION PASS-BAND RIPPLE
No decimation (DDC bypass) ƒ(DEVCLK) ƒ(DEVCLK) / 2 < ±0.001 dB Real signal,
12-bit data
Decimate-by-4 ƒ(DEVCLK) / 4 0.8 × ƒ(DEVCLK) / 4 > 90 dB < ±0.001 dB Complex signal,
15-bit data
Decimate-by-8 ƒ(DEVCLK) / 8 0.8 × ƒ(DEVCLK) / 8 > 90 dB < ±0.001 dB Complex signal,
15-bit data

Figure 10 to Figure 13 provide the composite decimation filter responses. The black portion of the trace shows the pass-band region, or alias-protected region, of the response. The red portion of the trace shows the transition region of the response as well as any frequency regions that will alias into the transition region. The transition region is not alias protected and therefore desired signals should only be placed in the pass-band region of the filter response. The blue portion of the trace shows the frequency regions that will alias into the pass-band after decimation and therefore define the stop-band region of the frequency response. The stop-band attenuation is defined to sufficient filter any undesired images or signals to prevent them from aliasing into the desired pass-band. Use analog filtering before the analog inputs (INA± or INB±) for additional attenuation of signals that fall within this band or to sufficiently reduce signals at the ADC inputs that may produce harmonics, interleaving spurs or other undesired spurious signals that will alias into the desired signal band (before the complex mixing and decimation operations).

ADC12DJ5200RF h4comp.gif
Figure 10. Decimate-by-4 Composite Response
ADC12DJ5200RF h8comp.gif
Figure 12. Decimate-by-8 Composite Response
ADC12DJ5200RF h4comp_zoomed.gif
Figure 11. Decimate-by-4 Composite Zoomed Pass-Band Response
ADC12DJ5200RF h8comp_zoomed.gif
Figure 13. Decimate-by-8 Composite Zoomed Pass-Band Response

For maximum efficiency, a group of high-speed filter blocks are implemented with specific blocks used for each decimation setting to achieve the composite responses illustrated in Figure 10 to Figure 13. Table 12 describes the combination of filter blocks used for each decimation setting and Table 13 lists the coefficient details and decimation factor of each filter block. The coefficients are symmetric with the center tap indicated by bold text.

Table 12. Decimation Mode Filter Usage

DECIMATION SETTING FILTER BLOCKS USED (Listed in Order of Operation)
4 CS40, CS80
8 CS20, CS40, CS80

Table 13. Filter Coefficient Details

FILTER COEFFICIENT SET (Decimation Factor of Filter, Scale factor)
CS20 (2, 2-14) CS40 (2, 2-17) CS80 (2, 2-19)
109 109 –327 –327 –37 –37
0 0 0 0 0 0
–837 –837 2231 2231 118 118
0 0 0 0 0 0
4824 4824 –8881 –8881 –291 –291
8192 0 0 0 0
39742 39742 612 612
65536 0 0
–1159 –1159
0 0
2031 2031
0 0
–3356 –3356
0 0
5308 5308
0 0
–8140 –8140
0 0
12284 12284
0 0
–18628 –18628
0 0
29455 29455
0 0
–53191 –53191
0 0
166059 166059
262144