ZHCSK11A July   2019  – October 2019 TLV320ADC5140

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     简化方框图
  4. 4 修订历史记录
  5. 5 器件比较表
  6. 6 Pin Configuration and Functions
    1.     Pin 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
    6. 7.6  Timing Requirements: I2C Interface
    7. 7.7  Switching Characteristics: I2C Interface
    8. 7.8  Timing Requirements: SPI Interface
    9. 7.9  Switching Characteristics: SPI Interface
    10. 7.10 Timing Requirements: TDM, I2S or LJ Interface
    11. 7.11 Switching Characteristics: TDM, I2S or LJ Interface
    12. 7.12 Timing Requirements: PDM Digital Microphone Interface
    13. 7.13 Switching Characteristics: PDM Digial Microphone Interface
    14. 7.14 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Serial Interfaces
        1. 8.3.1.1 Control Serial Interfaces
        2. 8.3.1.2 Audio Serial Interfaces
          1. 8.3.1.2.1 Time Division Multiplexed Audio (TDM) Interface
          2. 8.3.1.2.2 Inter IC Sound (I2S) Interface
          3. 8.3.1.2.3 Left-Justified (LJ) Interface
        3. 8.3.1.3 Using Multiple Devices With Shared Buses
      2. 8.3.2  Phase-Locked Loop (PLL) and Clock Generation
      3. 8.3.3  Input Channel Configurations
      4. 8.3.4  Reference Voltage
      5. 8.3.5  Programmable Microphone Bias
      6. 8.3.6  Signal-Chain Processing
        1. 8.3.6.1 Programmable Channel Gain and Digital Volume Control
        2. 8.3.6.2 Programmable Channel Gain Calibration
        3. 8.3.6.3 Programmable Channel Phase Calibration
        4. 8.3.6.4 Programmable Digital High-Pass Filter
        5. 8.3.6.5 Programmable Digital Biquad Filters
        6. 8.3.6.6 Programmable Channel Summer and Digital Mixer
        7. 8.3.6.7 Configurable Digital Decimation Filters
          1. 8.3.6.7.1 Linear Phase Filters
            1. 8.3.6.7.1.1 Sampling Rate: 8 kHz or 7.35 kHz
            2. 8.3.6.7.1.2 Sampling Rate: 16 kHz or 14.7 kHz
            3. 8.3.6.7.1.3 Sampling Rate: 24 kHz or 22.05 kHz
            4. 8.3.6.7.1.4 Sampling Rate: 32 kHz or 29.4 kHz
            5. 8.3.6.7.1.5 Sampling Rate: 48 kHz or 44.1 kHz
            6. 8.3.6.7.1.6 Sampling Rate: 96 kHz or 88.2 kHz
            7. 8.3.6.7.1.7 Sampling Rate: 192 kHz or 176.4 kHz
            8. 8.3.6.7.1.8 Sampling Rate: 384 kHz or 352.8 kHz
            9. 8.3.6.7.1.9 Sampling Rate 768 kHz or 705.6 kHz
          2. 8.3.6.7.2 Low-Latency Filters
            1. 8.3.6.7.2.1 Sampling Rate: 16 kHz or 14.7 kHz
            2. 8.3.6.7.2.2 Sampling Rate: 24 kHz or 22.05 kHz
            3. 8.3.6.7.2.3 Sampling Rate: 32 kHz or 29.4 kHz
            4. 8.3.6.7.2.4 Sampling Rate: 48 kHz or 44.1 kHz
            5. 8.3.6.7.2.5 Sampling Rate: 96 kHz or 88.2 kHz
            6. 8.3.6.7.2.6 Sampling Rate 192 kHz or 176.4 kHz
          3. 8.3.6.7.3 Ultra-Low-Latency Filters
            1. 8.3.6.7.3.1 Sampling Rate: 16 kHz or 14.7 kHz
            2. 8.3.6.7.3.2 Sampling Rate: 24 kHz or 22.05 kHz
            3. 8.3.6.7.3.3 Sampling Rate: 32 kHz or 29.4 kHz
            4. 8.3.6.7.3.4 Sampling Rate: 48 kHz or 44.1 kHz
            5. 8.3.6.7.3.5 Sampling Rate: 96 kHz or 88.2 kHz
            6. 8.3.6.7.3.6 Sampling Rate 192 kHz or 176.4 kHz
            7. 8.3.6.7.3.7 Sampling Rate 384 kHz or 352.8 kHz
      7. 8.3.7  Dynamic Range Enhancer (DRE)
      8. 8.3.8  Automatic Gain Controller (AGC)
      9. 8.3.9  Digital PDM Microphone Record Channel
      10. 8.3.10 Interrupts, Status, and Digital I/O Pin Multiplexing
    4. 8.4 Device Functional Modes
      1. 8.4.1 Hardware Shutdown
      2. 8.4.2 Sleep Mode or Software Shutdown
      3. 8.4.3 Active Mode
      4. 8.4.4 Software Reset
    5. 8.5 Programming
      1. 8.5.1 Control Serial Interfaces
        1. 8.5.1.1 I2C Control Interface
          1. 8.5.1.1.1 General I2C Operation
          2. 8.5.1.1.2 I2C Single-Byte and Multiple-Byte Transfers
            1. 8.5.1.1.2.1 I2C Single-Byte Write
            2. 8.5.1.1.2.2 I2C Multiple-Byte Write
            3. 8.5.1.1.2.3 I2C Single-Byte Read
            4. 8.5.1.1.2.4 I2C Multiple-Byte Read
        2. 8.5.1.2 SPI Control Interface
          1. Table 1. SPI Command Word
    6. 8.6 Register Maps
      1. 8.6.1 Device Configuration Registers
        1. 8.6.1.1 Register Descriptions
          1. 8.6.1.1.1  PAGE_CFG Register (page = 0x00, address = 0x00) [reset = 0h]
            1. Table 53. PAGE_CFG Register Field Descriptions
          2. 8.6.1.1.2  SW_RESET Register (page = 0x00, address = 0x01) [reset = 0h]
            1. Table 54. SW_RESET Register Field Descriptions
          3. 8.6.1.1.3  SLEEP_CFG Register (page = 0x00, address = 0x02) [reset = 0h]
            1. Table 55. SLEEP_CFG Register Field Descriptions
          4. 8.6.1.1.4  SHDN_CFG Register (page = 0x00, address = 0x05) [reset = 5h]
            1. Table 56. SHDN_CFG Register Field Descriptions
          5. 8.6.1.1.5  ASI_CFG0 Register (page = 0x00, address = 0x07) [reset = 30h]
            1. Table 57. ASI_CFG0 Register Field Descriptions
          6. 8.6.1.1.6  ASI_CFG1 Register (page = 0x00, address = 0x08) [reset = 0h]
            1. Table 58. ASI_CFG1 Register Field Descriptions
          7. 8.6.1.1.7  ASI_CFG2 Register (page = 0x00, address = 0x09) [reset = 0h]
            1. Table 59. ASI_CFG2 Register Field Descriptions
          8. 8.6.1.1.8  ASI_CH1 Register (page = 0x00, address = 0x0B) [reset = 0h]
            1. Table 60. ASI_CH1 Register Field Descriptions
          9. 8.6.1.1.9  ASI_CH2 Register (page = 0x00, address = 0x0C) [reset = 1h]
            1. Table 61. ASI_CH2 Register Field Descriptions
          10. 8.6.1.1.10 ASI_CH3 Register (page = 0x00, address = 0x0D) [reset = 2h]
            1. Table 62. ASI_CH3 Register Field Descriptions
          11. 8.6.1.1.11 ASI_CH4 Register (page = 0x00, address = 0x0E) [reset = 3h]
            1. Table 63. ASI_CH4 Register Field Descriptions
          12. 8.6.1.1.12 ASI_CH5 Register (page = 0x00, address = 0x0F) [reset = 4h]
            1. Table 64. ASI_CH5 Register Field Descriptions
          13. 8.6.1.1.13 ASI_CH6 Register (page = 0x00, address = 0x10) [reset = 5h]
            1. Table 65. ASI_CH6 Register Field Descriptions
          14. 8.6.1.1.14 ASI_CH7 Register (page = 0x00, address = 0x11) [reset = 6h]
            1. Table 66. ASI_CH7 Register Field Descriptions
          15. 8.6.1.1.15 ASI_CH8 Register (page = 0x00, address = 0x12) [reset = 7h]
            1. Table 67. ASI_CH8 Register Field Descriptions
          16. 8.6.1.1.16 MST_CFG0 Register (page = 0x00, address = 0x13) [reset = 2h]
            1. Table 68. MST_CFG0 Register Field Descriptions
          17. 8.6.1.1.17 MST_CFG1 Register (page = 0x00, address = 0x14) [reset = 48h]
            1. Table 69. MST_CFG1 Register Field Descriptions
          18. 8.6.1.1.18 ASI_STS Register (page = 0x00, address = 0x15) [reset = FFh]
            1. Table 70. ASI_STS Register Field Descriptions
          19. 8.6.1.1.19 CLK_SRC Register (page = 0x00, address = 0x16) [reset = 10h]
            1. Table 71. CLK_SRC Register Field Descriptions
          20. 8.6.1.1.20 PDMCLK_CFG Register (page = 0x00, address = 0x1F) [reset = 40h]
            1. Table 72. PDMCLK_CFG Register Field Descriptions
          21. 8.6.1.1.21 PDMIN_CFG Register (page = 0x00, address = 0x20) [reset = 0h]
            1. Table 73. PDMIN_CFG Register Field Descriptions
          22. 8.6.1.1.22 GPIO_CFG0 Register (page = 0x00, address = 0x21) [reset = 22h]
            1. Table 74. GPIO_CFG0 Register Field Descriptions
          23. 8.6.1.1.23 GPO_CFG0 Register (page = 0x00, address = 0x22) [reset = 0h]
            1. Table 75. GPO_CFG0 Register Field Descriptions
          24. 8.6.1.1.24 GPO_CFG1 Register (page = 0x00, address = 0x23) [reset = 0h]
            1. Table 76. GPO_CFG1 Register Field Descriptions
          25. 8.6.1.1.25 GPO_CFG2 Register (page = 0x00, address = 0x24) [reset = 0h]
            1. Table 77. GPO_CFG2 Register Field Descriptions
          26. 8.6.1.1.26 GPO_CFG3 Register (page = 0x00, address = 0x25) [reset = 0h]
            1. Table 78. GPO_CFG3 Register Field Descriptions
          27. 8.6.1.1.27 GPO_VAL Register (page = 0x00, address = 0x29) [reset = 0h]
            1. Table 79. GPO_VAL Register Field Descriptions
          28. 8.6.1.1.28 GPIO_MON Register (page = 0x00, address = 0x2A) [reset = 0h]
            1. Table 80. GPIO_MON Register Field Descriptions
          29. 8.6.1.1.29 GPI_CFG0 Register (page = 0x00, address = 0x2B) [reset = 0h]
            1. Table 81. GPI_CFG0 Register Field Descriptions
          30. 8.6.1.1.30 GPI_CFG1 Register (page = 0x00, address = 0x2C) [reset = 0h]
            1. Table 82. GPI_CFG1 Register Field Descriptions
          31. 8.6.1.1.31 GPI_MON Register (page = 0x00, address = 0x2F) [reset = 0h]
            1. Table 83. GPI_MON Register Field Descriptions
          32. 8.6.1.1.32 INT_CFG Register (page = 0x00, address = 0x32) [reset = 0h]
            1. Table 84. INT_CFG Register Field Descriptions
          33. 8.6.1.1.33 INT_MASK0 Register (page = 0x00, address = 0x33) [reset = FFh]
            1. Table 85. INT_MASK0 Register Field Descriptions
          34. 8.6.1.1.34 INT_LTCH0 Register (page = 0x00, address = 0x36) [reset = 0h]
            1. Table 86. INT_LTCH0 Register Field Descriptions
          35. 8.6.1.1.35 BIAS_CFG Register (page = 0x00, address = 0x3B) [reset = 0h]
            1. Table 87. BIAS_CFG Register Field Descriptions
          36. 8.6.1.1.36 CH1_CFG0 Register (page = 0x00, address = 0x3C) [reset = 0h]
            1. Table 88. CH1_CFG0 Register Field Descriptions
          37. 8.6.1.1.37 CH1_CFG1 Register (page = 0x00, address = 0x3D) [reset = 0h]
            1. Table 89. CH1_CFG1 Register Field Descriptions
          38. 8.6.1.1.38 CH1_CFG2 Register (page = 0x00, address = 0x3E) [reset = C9h]
            1. Table 90. CH1_CFG2 Register Field Descriptions
          39. 8.6.1.1.39 CH1_CFG3 Register (page = 0x00, address = 0x3F) [reset = 80h]
            1. Table 91. CH1_CFG3 Register Field Descriptions
          40. 8.6.1.1.40 CH1_CFG4 Register (page = 0x00, address = 0x40) [reset = 0h]
            1. Table 92. CH1_CFG4 Register Field Descriptions
          41. 8.6.1.1.41 CH2_CFG0 Register (page = 0x00, address = 0x41) [reset = 0h]
            1. Table 93. CH2_CFG0 Register Field Descriptions
          42. 8.6.1.1.42 CH2_CFG1 Register (page = 0x00, address = 0x42) [reset = 0h]
            1. Table 94. CH2_CFG1 Register Field Descriptions
          43. 8.6.1.1.43 CH2_CFG2 Register (page = 0x00, address = 0x43) [reset = C9h]
            1. Table 95. CH2_CFG2 Register Field Descriptions
          44. 8.6.1.1.44 CH2_CFG3 Register (page = 0x00, address = 0x44) [reset = 80h]
            1. Table 96. CH2_CFG3 Register Field Descriptions
          45. 8.6.1.1.45 CH2_CFG4 Register (page = 0x00, address = 0x45) [reset = 0h]
            1. Table 97. CH2_CFG4 Register Field Descriptions
          46. 8.6.1.1.46 CH3_CFG0 Register (page = 0x00, address = 0x46) [reset = 0h]
            1. Table 98. CH3_CFG0 Register Field Descriptions
          47. 8.6.1.1.47 CH3_CFG1 Register (page = 0x00, address = 0x47) [reset = 0h]
            1. Table 99. CH3_CFG1 Register Field Descriptions
          48. 8.6.1.1.48 CH3_CFG2 Register (page = 0x00, address = 0x48) [reset = C9h]
            1. Table 100. CH3_CFG2 Register Field Descriptions
          49. 8.6.1.1.49 CH3_CFG3 Register (page = 0x00, address = 0x49) [reset = 80h]
            1. Table 101. CH3_CFG3 Register Field Descriptions
          50. 8.6.1.1.50 CH3_CFG4 Register (page = 0x00, address = 0x4A) [reset = 0h]
            1. Table 102. CH3_CFG4 Register Field Descriptions
          51. 8.6.1.1.51 CH4_CFG0 Register (page = 0x00, address = 0x4B) [reset = 0h]
            1. Table 103. CH4_CFG0 Register Field Descriptions
          52. 8.6.1.1.52 CH4_CFG1 Register (page = 0x00, address = 0x4C) [reset = 0h]
            1. Table 104. CH4_CFG1 Register Field Descriptions
          53. 8.6.1.1.53 CH4_CFG2 Register (page = 0x00, address = 0x4D) [reset = C9h]
            1. Table 105. CH4_CFG2 Register Field Descriptions
          54. 8.6.1.1.54 CH4_CFG3 Register (page = 0x00, address = 0x4E) [reset = 80h]
            1. Table 106. CH4_CFG3 Register Field Descriptions
          55. 8.6.1.1.55 CH4_CFG4 Register (page = 0x00, address = 0x4F) [reset = 0h]
            1. Table 107. CH4_CFG4 Register Field Descriptions
          56. 8.6.1.1.56 CH5_CFG2 Register (page = 0x00, address = 0x52) [reset = C9h]
            1. Table 108. CH5_CFG2 Register Field Descriptions
          57. 8.6.1.1.57 CH5_CFG3 Register (page = 0x00, address = 0x53) [reset = 80h]
            1. Table 109. CH5_CFG3 Register Field Descriptions
          58. 8.6.1.1.58 CH5_CFG4 Register (page = 0x00, address = 0x54) [reset = 0h]
            1. Table 110. CH5_CFG4 Register Field Descriptions
          59. 8.6.1.1.59 CH6_CFG2 Register (page = 0x00, address = 0x57) [reset = C9h]
            1. Table 111. CH6_CFG2 Register Field Descriptions
          60. 8.6.1.1.60 CH6_CFG3 Register (page = 0x00, address = 0x58) [reset = 80h]
            1. Table 112. CH6_CFG3 Register Field Descriptions
          61. 8.6.1.1.61 CH6_CFG4 Register (page = 0x00, address = 0x59) [reset = 0h]
            1. Table 113. CH6_CFG4 Register Field Descriptions
          62. 8.6.1.1.62 CH7_CFG2 Register (page = 0x00, address = 0x5C) [reset = C9h]
            1. Table 114. CH7_CFG2 Register Field Descriptions
          63. 8.6.1.1.63 CH7_CFG3 Register (page = 0x00, address = 0x5D) [reset = 80h]
            1. Table 115. CH7_CFG3 Register Field Descriptions
          64. 8.6.1.1.64 CH7_CFG4 Register (page = 0x00, address = 0x5E) [reset = 0h]
            1. Table 116. CH7_CFG4 Register Field Descriptions
          65. 8.6.1.1.65 CH8_CFG2 Register (page = 0x00, address = 0x61) [reset = C9h]
            1. Table 117. CH8_CFG2 Register Field Descriptions
          66. 8.6.1.1.66 CH8_CFG3 Register (page = 0x00, address = 0x62) [reset = 80h]
            1. Table 118. CH8_CFG3 Register Field Descriptions
          67. 8.6.1.1.67 CH8_CFG4 Register (page = 0x00, address = 0x63) [reset = 0h]
            1. Table 119. CH8_CFG4 Register Field Descriptions
          68. 8.6.1.1.68 DSP_CFG0 Register (page = 0x00, address = 0x6B) [reset = 1h]
            1. Table 120. DSP_CFG0 Register Field Descriptions
          69. 8.6.1.1.69 DSP_CFG1 Register (page = 0x00, address = 0x6C) [reset = 40h]
            1. Table 121. DSP_CFG1 Register Field Descriptions
          70. 8.6.1.1.70 DRE_CFG0 Register (page = 0x00, address = 0x6D) [reset = 7Bh]
            1. Table 122. DRE_CFG0 Register Field Descriptions
          71. 8.6.1.1.71 AGC_CFG0 Register (page = 0x00, address = 0x70) [reset = E7h]
            1. Table 123. AGC_CFG0 Register Field Descriptions
          72. 8.6.1.1.72 IN_CH_EN Register (page = 0x00, address = 0x73) [reset = F0h]
            1. Table 124. IN_CH_EN Register Field Descriptions
          73. 8.6.1.1.73 ASI_OUT_CH_EN Register (page = 0x00, address = 0x74) [reset = 0h]
            1. Table 125. ASI_OUT_CH_EN Register Field Descriptions
          74. 8.6.1.1.74 PWR_CFG Register (page = 0x00, address = 0x75) [reset = 0h]
            1. Table 126. PWR_CFG Register Field Descriptions
          75. 8.6.1.1.75 DEV_STS0 Register (page = 0x00, address = 0x76) [reset = 0h]
            1. Table 127. DEV_STS0 Register Field Descriptions
          76. 8.6.1.1.76 DEV_STS1 Register (page = 0x00, address = 0x77) [reset = 80h]
            1. Table 128. DEV_STS1 Register Field Descriptions
          77. 8.6.1.1.77 I2C_CKSUM Register (page = 0x00, address = 0x7E) [reset = 0h]
            1. Table 129. I2C_CKSUM Register Field Descriptions
      2. 8.6.2 Programmable Coefficient Registers
        1. 8.6.2.1 Programmable Coefficient Registers: Page = 0x02
        2. 8.6.2.2 Programmable Coefficient Registers: Page = 0x03
        3. 8.6.2.3 Programmable Coefficient Registers: Page = 0x04
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Four-Channel Analog Microphone Recording
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Example Device Register Configuration Script for EVM Setup
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Eight-Channel Digital PDM Microphone Recording
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
          1. 9.2.2.2.1 Example Device Register Configuration Script for EVM Setup
    3. 9.3 What to Do and What Not to Do
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12器件和文档支持
    1. 12.1 文档支持
      1. 12.1.1 相关文档
    2. 12.2 接收文档更新通知
    3. 12.3 社区资源
    4. 12.4 商标
    5. 12.5 静电放电警告
    6. 12.6 Glossary
  13. 13机械、封装和可订购信息

6 Pin Configuration and Functions

RTW Package
24-Pin WQFN With Exposed Thermal Pad
Top View

Pin Functions

PIN TYPE DESCRIPTION
NO. NAME
1 AVDD Analog supply Analog power (1.8 V or 3.3 V, nominal)
2 AREG Analog supply Analog on-chip regulator output voltage for analog supply (1.8 V, nominal) or external analog power (1.8 V, nominal)
3 VREF Analog Analog reference voltage filter output
4 AVSS Analog supply Analog ground. Short this pin directly to the board ground plane.
5 MICBIAS Analog MICBIAS output
6 IN1P_GPI1 Analog input/digital input Analog input 1P pin or general-purpose digital input 1 (multipurpose functions such as digital microphone data, PLL input clock source, and so forth)
7 IN1M_GPO1 Analog input/digital output Analog input 1M pin or general-purpose digital output 1 (multipurpose functions such as digital microphone clock, interrupt, and so forth)
8 IN2P_GPI2 Analog input/digital input Analog input 2P pin or general-purpose digital input 2 (multipurpose functions such as digital microphones data, PLL input clock source, and so forth)
9 IN2M_GPO2 Analog input/digital output Analog input 2M pin or general-purpose digital output 2 (multipurpose functions such as digital microphone clock, interrupt, and so forth)
10 IN3P_GPI3 Analog input/digital input Analog input 3P pin or general-purpose digital input 3 (multipurpose functions such as digital microphones data, PLL input clock source, and so forth)
11 IN3M_GPO3 Analog input/digital output Analog input 3M pin or general-purpose digital output 3 (multipurpose functions such as digital microphone clock, interrupt, and so forth)
12 IN4P_GPI4 Analog input/digital input Analog input 4P pin or general-purpose digital input 4 (multipurpose functions such as digital microphones data, PLL input clock source, and so forth)
13 IN4M_GPO4 Analog input/digital output Analog input 4M pin or general-purpose digital output 4 (multipurpose functions such as digital microphone clock, interrupt, and so forth)
14 SHDNZ Digital input Device hardware shutdown and reset (active low)
15 ADDR1_MISO Digital I/O For I2C operation: I2C slave address A1 pin
For SPI operation: SPI slave output pin
16 ADDR0_SCLK Digital input For I2C operation: I2C slave address A0 pin
For SPI operation : SPI serial bit clock
17 SCL_MOSI Digital input For I2C operation: clock pin for I2C control bus
For SPI operation: SPI slave input pin
18 SDA_SSZ Digital I/O For I2C operation: data pin for I2C control bus
For SPI operation: SPI slave-select pin
19 IOVDD Digital supply Digital I/O power supply (1.8 V or 3.3 V, nominal)
20 GPIO1 Digital I/O General-purpose digital input/output 1 (multipurpose functions such as digital microphones clock or data, PLL input clock source, interrupt, and so forth)
21 SDOUT Digital output Audio serial data interface bus output
22 BCLK Digital I/O Audio serial data interface bus bit clock
23 FSYNC Digital I/O Audio serial data interface bus frame synchronization signal
24 DREG Digital supply Digital regulator output voltage for digital core supply (1.5 V, nominal)
Thermal Pad Thermal Pad (VSS) Ground supply Thermal pad shorted to internal device ground. Short the thermal pad directly to the board ground plane.
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