SLASEM6C October   2017  – October 2020 TAS2770

PRODUCTION DATA  

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
    1.     Pin Functions
  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
    6. 6.6 I2C Timing Requirements
    7. 6.7 TDM Port Timing Requirements
    8. 6.8 PDM Port Timing Requirements
    9. 6.9 Typical Characteristics
  7. Parameter Measurement Information
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Device Mode and Address Selection
      2. 8.3.2 General I2C Operation
      3. 8.3.3 Single-Byte and Multiple-Byte Transfers
      4. 8.3.4 Single-Byte Write
      5. 8.3.5 Multiple-Byte Write and Incremental Multiple-Byte Write
      6. 8.3.6 Single-Byte Read
      7. 8.3.7 Multiple-Byte Read
      8. 8.3.8 Register Organization
    4. 8.4 Device Functional Modes
      1. 8.4.1  PDM Input
      2. 8.4.2  TDM Port
      3. 8.4.3  Playback Signal Path
        1. 8.4.3.1 High Pass Filter
        2. 8.4.3.2 Digital Volume Control and Amplifier Output Level
        3. 8.4.3.3 Audio Playback Selection
        4. 8.4.3.4 Battery Tracking Limiter with Brown Out Prevention
        5. 8.4.3.5 Inter Chip Limiter Alignment
          1. 8.4.3.5.1 TDM Mode
        6. 8.4.3.6 Class-D Settings
      4. 8.4.4  SAR ADC
      5. 8.4.5  IV Sense
      6. 8.4.6  Clocks and PLL
      7. 8.4.7  Operational Modes
        1. 8.4.7.1 Hardware Shutdown
        2. 8.4.7.2 Software Shutdown
        3. 8.4.7.3 Mute
        4. 8.4.7.4 Active
        5. 8.4.7.5 Mode Control and Software Reset
      8. 8.4.8  Faults and Status
      9. 8.4.9  Power Sequencing Requirements
      10. 8.4.10 Digital Input Pull Downs
    5. 8.5 Register Maps
      1. 8.5.1 Register Summary Table Book=0x00 Page=0x00
      2. 8.5.2 Register Maps
        1. 8.5.2.1  PAGE (book=0x00 page=0x00 address=0x00) [reset=0h]
        2. 8.5.2.2  SW_RESET (book=0x00 page=0x00 address=0x01) [reset=0h]
        3. 8.5.2.3  PWR_CTL (book=0x00 page=0x00 address=0x02) [reset=Eh]
        4. 8.5.2.4  PB_CFG0 (book=0x00 page=0x00 address=0x03) [reset=10h]
        5. 8.5.2.5  PB_CFG1 (book=0x00 page=0x00 address=0x04) [reset=1h]
        6. 8.5.2.6  PB_CFG2 (book=0x00 page=0x00 address=0x05) [reset=0h]
        7. 8.5.2.7  PB_CFG3 (book=0x00 page=0x00 address=0x06) [reset=0h]
        8. 8.5.2.8  MISC_CFG (book=0x00 page=0x00 address=0x07) [reset=6h]
        9. 8.5.2.9  PDM_CFG0 (book=0x00 page=0x00 address=0x08) [reset=0h]
        10. 8.5.2.10 PDM_CFG1 (book=0x00 page=0x00 address=0x09) [reset=8h]
        11. 8.5.2.11 TDM_CFG0 (book=0x00 page=0x00 address=0x0A) [reset=7h]
        12. 8.5.2.12 TDM_CFG1 (book=0x00 page=0x00 address=0x0B) [reset=2h]
        13. 8.5.2.13 TDM_CFG2 (book=0x00 page=0x00 address=0x0C) [reset=Ah]
        14. 8.5.2.14 TDM_CFG3 (book=0x00 page=0x00 address=0x0D) [reset=10h]
        15. 8.5.2.15 TDM_CFG4 (book=0x00 page=0x00 address=0x0E) [reset=13h]
        16. 8.5.2.16 TDM_CFG5 (book=0x00 page=0x00 address=0x0F) [reset=2h]
        17. 8.5.2.17 TDM_CFG6 (book=0x00 page=0x00 address=0x10) [reset=0h]
        18. 8.5.2.18 TDM_CFG7 (book=0x00 page=0x00 address=0x11) [reset=4h]
        19. 8.5.2.19 TDM_CFG8 (book=0x00 page=0x00 address=0x12) [reset=6h]
        20. 8.5.2.20 TDM_CFG9 (book=0x00 page=0x00 address=0x13) [reset=7h]
        21. 8.5.2.21 TDM_CFG10 (book=0x00 page=0x00 address=0x14) [reset=8h]
        22. 8.5.2.22 LIM_CFG0 (book=0x00 page=0x00 address=0x15) [reset=14h]
        23. 8.5.2.23 LIM_CFG1 (book=0x00 page=0x00 address=0x16) [reset=76h]
        24. 8.5.2.24 LIM_CFG2 (book=0x00 page=0x00 address=0x17) [reset=10h]
        25. 8.5.2.25 LIM_CFG3 (book=0x00 page=0x00 address=0x18) [reset=6Eh]
        26. 8.5.2.26 LIM_CFG4 (book=0x00 page=0x00 address=0x19) [reset=1Eh]
        27. 8.5.2.27 LIM_CFG5 (book=0x00 page=0x00 address=0x1A) [reset=58h]
        28. 8.5.2.28 BOP_CFG0 (book=0x00 page=0x00 address=0x1B) [reset=1h]
        29. 8.5.2.29 BOP_CFG1 (book=0x00 page=0x00 address=0x1C) [reset=14h]
        30. 8.5.2.30 BOP_CFG2 (book=0x00 page=0x00 address=0x1D) [reset=4Eh]
        31. 8.5.2.31 ICLA_CFG0 (book=0x00 page=0x00 address=0x1E) [reset=0h]
        32. 8.5.2.32 ICLA_CFG1 (book=0x00 page=0x00 address=0x1F) [reset=0h]
        33. 8.5.2.33 INT_MASK0 (book=0x00 page=0x00 address=0x20) [reset=FCh]
        34. 8.5.2.34 INT_MASK1 (book=0x00 page=0x00 address=0x21) [reset=B1h]
        35. 8.5.2.35 INT_LIVE0 (book=0x00 page=0x00 address=0x22) [reset=0h]
        36. 8.5.2.36 INT_LIVE1 (book=0x00 page=0x00 address=0x23) [reset=0h]
        37. 8.5.2.37 INT_LTCH0 (book=0x00 page=0x00 address=0x24) [reset=0h]
        38. 8.5.2.38 INT_LTCH1 (book=0x00 page=0x00 address=0x25) [reset=0h]
        39. 8.5.2.39 INT_LTCH2 (book=0x00 page=0x00 address=0x26) [reset=0h]
        40. 8.5.2.40 VBAT_MSB (book=0x00 page=0x00 address=0x27) [reset=0h]
        41. 8.5.2.41 VBAT_LSB (book=0x00 page=0x00 address=0x28) [reset=0h]
        42. 8.5.2.42 TEMP_MSB (book=0x00 page=0x00 address=0x29) [reset=0h]
        43. 8.5.2.43 TEMP_LSB (book=0x00 page=0x00 address=0x2A) [reset=0h]
        44. 8.5.2.44 INT_CFG (book=0x00 page=0x00 address=0x30) [reset=5h]
        45. 8.5.2.45 DIN_PD (book=0x00 page=0x00 address=0x31) [reset=0h]
        46. 8.5.2.46 MISC_IRQ (book=0x00 page=0x00 address=0x32) [reset=81h]
        47. 8.5.2.47 CLOCK_CFG (book=0x00 page=0x00 address=0x3C) [reset=Dh]
        48. 8.5.2.48 TDM_DET (book=0x00 page=0x00 address=0x77) [reset=7Fh]
        49. 8.5.2.49 REV_ID (book=0x00 page=0x00 address=0x7D) [reset=20h]
        50. 8.5.2.50 I2C_CKSUM (book=0x00 page=0x00 address=0x7E) [reset=0h]
        51. 8.5.2.51 BOOK (book=0x00 page=0x00 address=0x7F) [reset=0h]
  9. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Overview
        2. 9.2.2.2 Select Input Capacitance
        3. 9.2.2.3 Select Decoupling Capacitors
        4. 9.2.2.4 Select Bootstrap Capacitors
      3. 9.2.3 Application Curves
    3. 9.3 Initialization Set Up
      1. 9.3.1 Initial Device Configuration - Auto Rate
      2. 9.3.2 Initial Device Configuration - 48 kHz
      3. 9.3.3 Initial Device Configuration - 44.1 kHz
      4. 9.3.4 Sample Rate Change - 48 kHz to 44.1kHz
      5. 9.3.5 Sample Rate Change - 44.1 kHz to 48 kHz
      6. 9.3.6 Device Mute
      7. 9.3.7 Device Un-Mute
      8. 9.3.8 Device Sleep
      9. 9.3.9 Device Wake
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Receiving Notification of Documentation Updates
    2. 12.2 Community Resources
    3. 12.3 Trademarks
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

Digital Volume Control and Amplifier Output Level

The gain from audio input to speaker terminals is controlled by setting the amplifier’s output level and digital volume control (DVC). A separate DVC is provided for PDM (available from the PDM input pins) and PCM (available from the TDM ports pins) playback paths.

Amplifier output level settings are presented in dBV (dB relative to 1 Vrms) with a full scale digital audio input (0 dBFS) and the digital volume control set to 0 dB. It should be noted that these levels may not be achievable because of analog clipping in the amplifier, so they should be used to convey gain only. Table 8-37 below shows analog gain settings that can be programmed via the AMP_LEVEL[4:0] register bits.

Table 8-37 Amplifier Output Level Settings
AMP_LEVEL[4:0]FULL SCALE OUTPUT
dBVVPEAK (V)
0x00
11.05.02
0x01
11.55.32
0x02
12.05.63
0x03
12.55.96
0x04
13.06.32
0x05
13.56.69
0x06
14.07.09
0x07
14.57.51
0x08
15.07.95
0x09
15.58.42
0x0A
16.08.92
0x0B
16.59.45
0x0C
17.010.0
0x0D
17.510.6
0x0E
18.011.2
0x0F
18.511.9
0x10
19.0 (default)12.6 (default)
0x11
19.513.4
0x12
20.014.1
0x13
20.514.98
0x14
21.015.87
0x15 - 0x1F
ReservedReserved

Equation 1 calculates the amplifiers output voltage.

Equation 1. GUID-6769C2FF-79A8-4F4F-884A-58E7AA3FB0AA-low.gif

where

  • VAMP is the amplifier output voltage in dBV
  • Input is the digital input amplitude in dB with respect to 0 dBFS
  • Advc is the digital volume control setting, 0 dB to -100 dB in 0.5 dB steps
  • AAMP is the amplifier output level setting in dBV

The digital volume control (DVC) is independently configurable for PCM and PDM streams from 0 dB to -100 dB in 0.5 dB steps by setting the DVC_PCM[7:0] and PVC_PDM[7:0] register bits respectively. Settings greater than 0xC8 are interpreted as mute. When a change in digital volume control occurs, the device ramps the volume to the new setting based on the DVC_RATE[1:0] register bits. If DVC_RATE[1:0] is set to 2'b11, volume ramping is disabled. This can be used to speed up startup, shutdown and digital volume changes when volume ramping is handled by the system master.

Table 8-38 PCM Digital Volume Control
DVC_PCM[7:0]Volume (dB)
0x00
0 (default)
0x01
-0.5
0x02
-1
...
...
0xC8
-100
0xC9 - 0xFF
Mute
Table 8-39 PDM Digital Volume Control
DVC_PDM[7:0]Volume (dB)
0x00
0 (default)
0x01
-0.5
0x02
-1
...
...
0xC8
-100
0xC9 - 0xFF
Mute
Table 8-40 Digital Volume Ramp Rate
DVC_RAMP[1:0]Ramp Rate
00
0.5 dB per 1 Sample (default)
01
0.5 dB per 4 Samples
10
0.5 dB per 8 Samples
11
Volume Ramping Disabled

The Class-D amplifier uses a closed-loop architecture, so the gain does not depend on VBAT. The approximate threshold for the onset of analog clipping is calculated in Equation 2.

Equation 2. GUID-6ACBA89E-D378-4FA0-9F2A-0B78558CFD8A-low.gif

where

  • VPK(max,preclip) is the maximum peak unclipped output voltage in V
  • VBAT is the power supply voltage
  • RL is the speaker load in Ω
  • Rinterconnect is the additional resistance in the PCB (such as cabling and filters) in Ω
  • RFET(on) is the power stage total on resistance (HS FET+LS FET+Sense Resistor+bonding+packaging) in Ω

The effective on-resistance for this device (including HS+LS FET, Sense Resistor and bonding and packaging leads) is approximately 510 mΩ at room temperature. Table 8-41 shows approximate maximum unclipped peak output voltages at room temperature (excluding interconnect resistances).

Table 8-41 Approximate Maximum Unclipped Peak Output Voltage at Room Temperature
SUPPLY VOLTAGE
VBAT (V)
MAXIMUM UNCLIPPED
PEAK VOLTAGE
VPK (V)
RL = 4 ΩRL = 8 Ω
8.47.457.90
12.611.1811.84