SLASEG6B May   2018  – June 2020 TAS3251

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Simplified Schematic
  4. 4 Revision History
  5. 5 Device Comparison Table
  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  Amplifier Electrical Characteristics
    6. 7.6  DAC Electrical Characteristics
    7. 7.7  Audio Characteristics (BTL)
    8. 7.8  Audio Characteristics (PBTL)
    9. 7.9  MCLK Timing
    10. 7.10 Serial Audio Port Timing – Slave Mode
    11. 7.11 Serial Audio Port Timing – Master Mode
    12. 7.12 I2C Bus Timing –Standard
    13. 7.13 I2C Bus Timing –Fast
    14. 7.14 Timing Diagrams
    15. 7.15 Typical Characteristics
      1. 7.15.1 BTL Configuration
      2. 7.15.2 PBTL Configuration
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Power-on-Reset (POR) Function
      2. 8.3.2  Enable Device
      3. 8.3.3  DAC and DSP Clocking
        1. 8.3.3.1 Internal Clock Error Notification (CLKE)
      4. 8.3.4  Serial Audio Port
        1. 8.3.4.1 Clock Master Mode from Audio Rate Master Clock
        2. 8.3.4.2 Clock Slave Mode with 4-Wire Operation (SCLK, MCLK, LRCK/FS, SDIN)
        3. 8.3.4.3 Clock Slave Mode with SCLK PLL to Generate Internal Clocks (3-Wire PCM)
          1. 8.3.4.3.1 Clock Generation Using the PLL
          2. 8.3.4.3.2 PLL Calculation
            1. 8.3.4.3.2.1 Examples:
        4. 8.3.4.4 Serial Audio Port – Data Formats and Bit Depths
          1. 8.3.4.4.1 Data Formats and Master/Slave Modes of Operation
        5. 8.3.4.5 Input Signal Sensing (Power-Save Mode)
      5. 8.3.5  Volume Control
        1. 8.3.5.1 DAC Digital Gain Control
          1. 8.3.5.1.1 Emergency Volume Ramp Down
      6. 8.3.6  SDOUT Port and Hardware Control Pin
      7. 8.3.7  I2C Communication Port
        1. 8.3.7.1 Slave Address
        2. 8.3.7.2 Register Address Auto-Increment Mode
        3. 8.3.7.3 Packet Protocol
        4. 8.3.7.4 Write Register
        5. 8.3.7.5 Read Register
        6. 8.3.7.6 DSP Book, Page, and Register Update
          1. 8.3.7.6.1 Book and Page Change
          2. 8.3.7.6.2 Swap Flag
          3. 8.3.7.6.3 Example Use
      8. 8.3.8  Pop and Click Free Startup and Shutdown
      9. 8.3.9  Integrated Oscillator for Output Power Stage
        1. 8.3.9.1 Oscillator Synchronization and Slave Mode
      10. 8.3.10 Device Output Stage Protection System
        1. 8.3.10.1 Error Reporting
        2. 8.3.10.2 Overload and Short Circuit Current Protection
        3. 8.3.10.3 Signal Clipping and Pulse Injector
        4. 8.3.10.4 DC Speaker Protection
        5. 8.3.10.5 Pin-to-Pin Short Circuit Protection (PPSC)
        6. 8.3.10.6 Overtemperature Protection OTW and OTE
        7. 8.3.10.7 Undervoltage Protection (UVP) and Power-on Reset (POR)
        8. 8.3.10.8 Fault Handling
        9. 8.3.10.9 Output Power Stage Reset
      11. 8.3.11 Initialization, Startup and Shutdown
        1. 8.3.11.1 Power Up and Startup Sequence
        2. 8.3.11.2 Power Down and Shutdown Sequence
        3. 8.3.11.3 Device Mute
        4. 8.3.11.4 Device Unmute
        5. 8.3.11.5 Device Reset
        6. 8.3.11.6 Mute with DAC_MUTE or Clock Error
          1. 8.3.11.6.1 Mute using DAC_MUTE
        7. 8.3.11.7 Mute using Serial Audio Port Clock
        8. 8.3.11.8 Muting before an Unplanned Shutdown with DAC_MUTE
        9. 8.3.11.9 Output Power Stage Startup Timing
    4. 8.4 Device Functional Modes
      1. 8.4.1 Serial Audio Port Operating Modes
        1. 8.4.1.1 Master and Slave Mode Clocking for Digital Serial Audio Port
      2. 8.4.2 Communication Port Operating Modes
      3. 8.4.3 Speaker Amplifier Operating Modes
        1. 8.4.3.1 Stereo Mode
        2. 8.4.3.2 Mono Mode
    5. 8.5 Programming
      1. 8.5.1 Audio Processing Features
      2. 8.5.2 Processing Block Description
        1. 8.5.2.1  Input Scale and Mixer
          1. 8.5.2.1.1 Example
        2. 8.5.2.2  Sample Rate Converter
        3. 8.5.2.3  Parametric Equalizers (PEQ)
        4. 8.5.2.4  BQ Gain Scale
        5. 8.5.2.5  Dynamic Parametric Equalizer (DPEQ)
        6. 8.5.2.6  Two-Band Dynamic Range Control
        7. 8.5.2.7  Automatic Gain Limiter
          1. 8.5.2.7.1 Softening Filter Alpha (AEA)
          2. 8.5.2.7.2 Softening Filter Omega (AEO)
          3. 8.5.2.7.3 Attack Rate
          4. 8.5.2.7.4 Release Rate
          5. 8.5.2.7.5 Attack Threshold
        8. 8.5.2.8  Fine Volume
        9. 8.5.2.9  THD Boost
        10. 8.5.2.10 Level Meter
      3. 8.5.3 Other Processing Block Features
        1. 8.5.3.1 Number Format
          1. 8.5.3.1.1 Coefficient Format Conversion
      4. 8.5.4 Checksum
        1. 8.5.4.1 Cyclic Redundancy Check (CRC) Checksum
        2. 8.5.4.2 Exclusive or (XOR) Checksum
    6. 8.6 Register Maps
      1. 8.6.1 Registers - Page 0
        1. 8.6.1.1  Register 1 (0x01)
          1. Table 32. Register 1 (0x01) Field Descriptions
        2. 8.6.1.2  Register 2 (0x02)
          1. Table 33. Register 2 (0x02) Field Descriptions
        3. 8.6.1.3  Register 3 (0x03)
          1. Table 34. Register 3 (0x03) Field Descriptions
        4. 8.6.1.4  Register 4 (0x04)
          1. Table 35. Register 4 (0x04) Field Descriptions
        5. 8.6.1.5  Register 6 (0x06)
          1. Table 36. Register 6 (0x06) Field Descriptions
        6. 8.6.1.6  Register 7 (0x07)
          1. Table 37. Register 7 (0x07) Field Descriptions
        7. 8.6.1.7  Register 8 (0x08)
          1. Table 38. Register 8 (0x08) Field Descriptions
        8. 8.6.1.8  Register 9 (0x09)
          1. Table 39. Register 9 (0x09) Field Descriptions
        9. 8.6.1.9  Register 12 (0x0C)
          1. Table 40. Register 12 (0x0C) Field Descriptions
        10. 8.6.1.10 Register 13 (0x0D)
          1. Table 41. Register 13 (0x0D) Field Descriptions
        11. 8.6.1.11 Register 14 (0x0E)
          1. Table 42. Register 14 (0x0E) Field Descriptions
        12. 8.6.1.12 Register 15 (0x0F)
          1. Table 43. Register 15 (0x0F) Field Descriptions
        13. 8.6.1.13 Register 16 (0x10)
          1. Table 44. Register 16 (0x10) Field Descriptions
        14. 8.6.1.14 Register 17 (0x11)
          1. Table 45. Register 17 (0x11) Field Descriptions
        15. 8.6.1.15 Register 18 (0x12)
          1. Table 46. Register 18 (0x12) Field Descriptions
        16. 8.6.1.16 Register 20 (0x14)
          1. Table 47. Register 20 (0x14) Field Descriptions
        17. 8.6.1.17 Register 21 (0x15)
          1. Table 48. Register 21 (0x15) Field Descriptions
        18. 8.6.1.18 Register 22 (0x16)
          1. Table 49. Register 22 (0x16) Field Descriptions
        19. 8.6.1.19 Register 23 (0x17)
          1. Table 50. Register 23 (0x17) Field Descriptions
        20. 8.6.1.20 Register 24 (0x18)
          1. Table 51. Register 24 (0x18) Field Descriptions
        21. 8.6.1.21 Register 27 (0x1B)
          1. Table 52. Register 27 (0x1B) Field Descriptions
        22. 8.6.1.22 Register 28 (0x1C)
          1. Table 53. Register 28 (0x1C) Field Descriptions
        23. 8.6.1.23 Register 29 (0x1D)
          1. Table 54. Register 29 (0x1D) Field Descriptions
        24. 8.6.1.24 Register 30 (0x1E)
          1. Table 55. Register 30 (0x1E) Field Descriptions
        25. 8.6.1.25 Register 32 (0x20)
          1. Table 56. Register 32 (0x20) Field Descriptions
        26. 8.6.1.26 Register 33 (0x21)
          1. Table 57. Register 33 (0x21) Field Descriptions
        27. 8.6.1.27 Register 34 (0x22)
          1. Table 58. Register 34 (0x22) Field Descriptions
        28. 8.6.1.28 Register 37 (0x25)
          1. Table 59. Register 37 (0x25) Field Descriptions
        29. 8.6.1.29 Register 40 (0x28)
          1. Table 60. Register 40 (0x28) Field Descriptions
        30. 8.6.1.30 Register 41 (0x29)
          1. Table 61. Register 41 (0x29) Field Descriptions
        31. 8.6.1.31 Register 42 (0x2A)
          1. Table 62. Register 42 (0x2A) Field Descriptions
        32. 8.6.1.32 Register 43 (0x2B)
          1. Table 63. Register 43 (0x2B) Field Descriptions
        33. 8.6.1.33 Register 44 (0x2C)
          1. Table 64. Register 44 (0x2C) Field Descriptions
        34. 8.6.1.34 Register 59 (0x3B)
          1. Table 65. Register 59 (0x3B) Field Descriptions
        35. 8.6.1.35 Register 60 (0x3C)
          1. Table 66. Register 60 (0x3C) Field Descriptions
        36. 8.6.1.36 Register 61 (0x3D)
          1. Table 67. Register 61 (0x3D) Field Descriptions
        37. 8.6.1.37 Register 62 (0x3E)
          1. Table 68. Register 62 (0x3E) Field Descriptions
        38. 8.6.1.38 Register 63 (0x3F)
          1. Table 69. Register 63 (0x3F) Field Descriptions
        39. 8.6.1.39 Register 64 (0x40)
          1. Table 70. Register 64 (0x40) Field Descriptions
        40. 8.6.1.40 Register 65 (0x41)
          1. Table 71. Register 65 (0x41) Field Descriptions
        41. 8.6.1.41 Register 67 (0x43)
          1. Table 72. Register 67 (0x43) Field Descriptions
        42. 8.6.1.42 Register 68 (0x44)
          1. Table 73. Register 68 (0x44) Field Descriptions
        43. 8.6.1.43 Register 69 (0x45)
          1. Table 74. Register 69 (0x45) Field Descriptions
        44. 8.6.1.44 Register 70 (0x46)
          1. Table 75. Register 70 (0x46) Field Descriptions
        45. 8.6.1.45 Register 71 (0x47)
          1. Table 76. Register 71 (0x47) Field Descriptions
        46. 8.6.1.46 Register 72 (0x48)
          1. Table 77. Register 72 (0x48) Field Descriptions
        47. 8.6.1.47 Register 73 (0x49)
          1. Table 78. Register 73 (0x49) Field Descriptions
        48. 8.6.1.48 Register 74 (0x4A)
          1. Table 79. Register 74 (0x4A) Field Descriptions
        49. 8.6.1.49 Register 75 (0x4B)
          1. Table 80. Register 75 (0x4B) Field Descriptions
        50. 8.6.1.50 Register 76 (0x4C)
          1. Table 81. Register 76 (0x4C) Field Descriptions
        51. 8.6.1.51 Register 78 (0x4E)
          1. Table 82. Register 78 (0x4E) Field Descriptions
        52. 8.6.1.52 Register 79 (0x4F)
          1. Table 83. Register 79 (0x4F) Field Descriptions
        53. 8.6.1.53 Register 85 (0x55)
          1. Table 84. Register 85 (0x55) Register Field Descriptions
        54. 8.6.1.54 Register 86 (0x56)
          1. Table 85. Register 86 (0x56) Register Field Descriptions
        55. 8.6.1.55 Register 87 (0x57)
          1. Table 86. Register 87 (0x57) Field Descriptions
        56. 8.6.1.56 Register 88 (0x58)
          1. Table 87. Register 88 (0x58) Field Descriptions
        57. 8.6.1.57 Register 91 (0x5B)
          1. Table 88. Register 91 (0x5B) Field Descriptions
        58. 8.6.1.58 Register 92 (0x5C)
          1. Table 89. Register 92 (0x5C) Field Descriptions
        59. 8.6.1.59 Register 93 (0x5D)
          1. Table 90. Register 93 (0x5D) Field Descriptions
        60. 8.6.1.60 Register 94 (0x5E)
          1. Table 91. Register 94 (0x5E) Field Descriptions
        61. 8.6.1.61 Register 95 (0x5F)
          1. Table 92. Register 95 (0x5F) Field Descriptions
        62. 8.6.1.62 Register 108 (0x6C)
          1. Table 93. Register 108 (0x6C) Field Descriptions
        63. 8.6.1.63 Register 119 (0x77)
          1. Table 94. Register 119 (0x77) Field Descriptions
        64. 8.6.1.64 Register 120 (0x78)
          1. Table 95. Register 120 (0x78) Field Descriptions
      2. 8.6.2 Registers - Page 1
        1. 8.6.2.1 Register 1 (0x01)
          1. Table 96. Register 1 (0x01) Field Descriptions
        2. 8.6.2.2 Register 2 (0x02)
          1. Table 97. Register 2 (0x02) Field Descriptions
        3. 8.6.2.3 Register 6 (0x06)
          1. Table 98. Register 6 (0x06) Field Descriptions
        4. 8.6.2.4 Register 7 (0x07)
          1. Table 99. Register 7 (0x07) Field Descriptions
        5. 8.6.2.5 Register 9 (0x09)
          1. Table 100. Register 9 (0x09) Field Descriptions
  9. 9 Application and Implementation
    1. 9.1 Typical Applications
      1. 9.1.1 Stereo, Bridge Tied Load (BTL) Application
      2. 9.1.2 Mono, Parallel Bridge-Tied Load (PBTL) Application
        1. 9.1.2.1 Parallel Bridge-Tied Load (PBTL), Pre-Filter
        2. 9.1.2.2 Parallel Bridge-Tied Load, Post-Filter
      3. 9.1.3 Design Requirements
      4. 9.1.4 Detailed Design Procedure
        1. 9.1.4.1 Step One: Schematic and Layout Design
          1. 9.1.4.1.1 Decoupling Capacitor Recommendations
          2. 9.1.4.1.2 PVDD Capacitor Recommendations
          3. 9.1.4.1.3 BST Capacitors
          4. 9.1.4.1.4 Heatsink
        2. 9.1.4.2 Step Two: Configure the Fixed-Function Process Flow for Use with the Target System
        3. 9.1.4.3 Step Three: Software Integration
      5. 9.1.5 Two TAS3251 Device Configurations
        1. 9.1.5.1 2 x PBTL Application
        2. 9.1.5.2 2 x BTL + 1 x PBTL Application
      6. 9.1.6 Three or More TAS3251 Device Configurations
      7. 9.1.7 Application Curves
  10. 10Power Supply Recommendations
    1. 10.1 Power Supplies
      1. 10.1.1 DAC_DVDD and DAC_AVDD Supplies
        1. 10.1.1.1 CPVSS, CN and CP Charge Pump
      2. 10.1.2 VDD Supply
      3. 10.1.3 GVDD_X Supply
      4. 10.1.4 PVDD Supply
      5. 10.1.5 BST Supply
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 General Guidelines for TAS3251
      2. 11.1.2 Importance of PVDD Bypass Capacitor Placement
    2. 11.2 Layout Examples
      1. 11.2.1 Bridge-Tied Load (BTL) Layout Example
      2. 11.2.2 Parallel Bridge-Tied Load (PBTL), Pre-Filter
      3. 11.2.3 Parallel Bridge-Tied Load (PBTL), Post-Filter
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Device Nomenclature
      2. 12.1.2 Development Support
    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

8.3.10.2 Overload and Short Circuit Current Protection

TAS3251 has fast reacting current sensors with a programmable trip threshold (OC threshold) on all high-side and low-side FETs. To prevent output current from increasing beyond the programmed threshold, TAS3251 has the option of either limiting the output current for each switching cycle (Cycle By Cycle Current Control, CB3C) or to perform an immediate shutdown of the output in case of excess output current (Latching Shutdown). CB3C prevents premature shutdown due to high output current transients caused by high level music transients and a drop of real speaker’s load impedance, and allows the output current to be limited to a maximum programmed level. If the maximum output current persists, i.e. the power stage being overloaded with too low load impedance, the device will shut down the affected output channel and the affected output is put in a high-impedance (Hi- Z) state until a RESET cycle is initiated. CB3C works individually for each half bridge output. If an over current event is triggered, CB3C performs a state flip of the half bridge output that is cleared upon beginning of next PWM frame.

TAS3251 CB3C_Timing.gifFigure 32. CB3C Timing Example

During CB3C an over load counter increments for each over current event and decrease for each non-over current PWM cycle. This allows full amplitude transients into a low speaker impedance without a shutdown protection action. In the event of a short circuit condition, the over current protection limits the output current by the CB3C operation and eventually shut down the affected output if the overload counter reaches its maximum value. If a latched OC operation is required such that the device shuts down the affected output immediately upon first detected over current event, this protection mode should be selected. The over current threshold and mode (CB3C or Latched OC) is programmed by the OC_ADJ resistor value. The OC_ADJ resistor needs to be within its intentional value range for either CB3C operation or Latched OC operation.

TAS3251 OC_ADJ_Resistor_Range.gifFigure 33. OC Threshold versus OC ADJ Resistor Value Example

OC_ADJ values outside specified value range for either CB3C or latched OC operation will result in minimum OC threshold.

Table 24. Device Protection

OC_ADJ Resistor Value Protection Mode OC Threshold
22 kΩ CB3C 16.3 A
24 kΩ CB3C 15.1 A
27 kΩ CB3C 13.5 A
30 kΩ CB3C 12.3 A
47 kΩ Latched OC 16.3 A
51 kΩ Latched OC 15.1 A
56 kΩ Latched OC 13.5 A
64 kΩ Latched OC 12.3 A