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TDA7801
Digital input (I2S), quad BTL output power amplifier with full I2C diagnostics
September 2013 DocID022674 Rev 4 1/48
TDA7801Digital input quad power amplifier with built-in diagnostics features
Datasheet - production data
Features Integrated 110 dB D/A conversionI2 S digital input (3.3/1.8 V) with TDM option Selectable input sampling frequency:
44.1 kHz, 48 kHz, 96 kHz, 192 kHz MOSFET power outputs High output power capability 4x28 W/ 4 @
14.4 V, 1 kHz, 10 % THD Max. output power 4x72 W/2 Full I2 C bus driving (3.3/5 V): Independent front/rear soft play/ mute Selectable gain (four levels) for very low
noise line-out function2 C bus digital diagnostics (including DC
and AC load detection) Two I2 C bus addresses and 8-ch TDM mode
(only in PowerSO package) Optional non I2 C bus mode Offset detector (play or mute mode) Clipping detector (selectable level) and
diagnostics pin CMOS compatible enable pin (3.3/5V) Full fault protection Four independent short circuit protections Linear thermal protection (four thermal
warnings) ESD protection
DescriptionThe TDA7801 is a new BCD technology quad
bridge amplifier for car audio applications.
Thanks to the BCD6 technology it is possible to
integrate a high performance D/A converter
together with powerful MOSFET outputs.
The possibility of having the D/A conversion on
board allows the performance to reach an
outstanding 115 dB S/N ratio with more than
105 dB of dynamic range.
This device is equipped with a full diagnostics
array that communicates the status of each
speaker through the I2 C bus. The possibility to
control the configuration and behavior of the
device by means of the I2 C bus makes TDA7801 a
very flexible machine.
Table 1. Device summary
Contents TDA78012/48 DocID022674 Rev 4
Contents Block diagram and pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61.1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Application diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72.1 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.4 Electrical characteristics typical curves . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Operation mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214.1 Standby mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.2 Tristate mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.3 Amplifier mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
"PLL-filter /enable" pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225.1 Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.2 Driving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236.1 Voltage supplies timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.2 Turn-on diagnostic description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.3 Permanent diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.4 AC diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.5 Output DC offset detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.6 Multiple faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.7 Faults availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.8 I2 C programming/reading sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.9 Legacy mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
6.10 Thermal protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
DocID022674 Rev 4 3/48
TDA7801 Contents6.11 Under-voltage threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.11.1 Supply voltage auto-mute threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.11.2 Digital mute disabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.11.3 Power-on reset threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.12 Fast mute features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2 S bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317.1 Interface timings requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
7.2 Group delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
2 C bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 348.1 Writing procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
8.2 Reading procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
8.3 Data validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
8.4 Start and stop conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
8.5 Byte format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
8.6 Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
2 C registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369.1 IB0-Addr:"00000" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
9.2 IB1-Addr:"00001" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
9.3 IB2-Addr:"00010" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
9.4 IB3-Addr:"00011" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
9.5 IB4-Addr:"00100" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
9.6 DB0-Addr:"10000" - Channel 1 (left front) . . . . . . . . . . . . . . . . . . . . . . . . 39
9.7 DB1-Addr:"10001" - Channel 2 (left rear) . . . . . . . . . . . . . . . . . . . . . . . . . 40
9.8 DB2-Addr:"10010"" - Channel 3 (right front) . . . . . . . . . . . . . . . . . . . . . . 41
9.9 DB3-Addr:"10011" - Channel 4 (right rear) . . . . . . . . . . . . . . . . . . . . . . . . 42
9.10 DB4-Addr:"10100" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
List of tables TDA7801
4/48 DocID022674 Rev 4
List of tables
Table 1. Device summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Flexiwatt27 (vertical/SMD/horizontal) pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 3. PowerSO36 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 4. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 5. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 6. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 7. Start-up diagnostic pulse typical timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 8. Multiple faults priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Table 9. System clock frequencies for common audio sampling frequencies . . . . . . . . . . . . . . . . . 32
Table 10. Example timing for tck = 1/fSCK, where fSCK is stated in the Table 9 . . . . . . . . . . . . . . . . . 33
Table 11. IB0-Addr:"00000" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Table 12. IB1-Addr:"00001" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Table 13. IB3-Addr:"00010" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Table 14. IB3-Addr:"00011" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Table 15. IB4-Addr:"00100" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Table 16. DB0-Addr:"10000" - Channel 1 (left front). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Table 17. DB1-Addr:"10001" - Channel 2 (left rear) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Table 18. DB2-Addr:"10010"" - Channel 3 (right front) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Table 19. DB3-Addr:"10011" - Channel 4 (right rear) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Table 20. DB4-Addr:"10100". . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Table 21. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
DocID022674 Rev 4 5/48
TDA7801 List of figures
List of figures
Figure 1. Block diagram (Flexiwatt27) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 2. I2 C bus mode application diagram (TDA7801/H/SM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 3. I2 C bus mode application diagram (TDA7801PD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 4. Legacy mode application diagram (TDA7801/H/SM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 5. Legacy mode application diagram (TDA7801PD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 6. Pin connection diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 7. Quiescent current vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 8. Output power vs. supply voltage(4 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 9. Output power vs. supply voltage (2 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 10. Distortion vs. output power (4 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 11. Distortion vs. output power (2 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 12. Distortion vs. frequency (4 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 13. Distortion vs. frequency (2 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 14. Vo vs. Vin (Gv1-2-3-4 settings). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 15. Vo vs. Vin (Gv1-2-3-4 settings + 6 dB dig. gain). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 16. Distortion vs. output voltage (LD-Gv2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 17. Distortion vs. output voltage (LD-Gv3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 18. Distortion vs. output voltage (LD-Gv4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 19. Output attenuation vs. Vs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 20. Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 21. Supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 22. Total power dissipation & efficiency vs. Po (4 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 23. Power dissipation vs. average Po (audio program simulation, 4 ) . . . . . . . . . . . . . . . . . . 20
Figure 24. Power dissipation vs. average Po (audio program simulation, 2 ) . . . . . . . . . . . . . . . . . . 20
Figure 25. ITU R-ARM frequency response, weighting filter for transient pop. . . . . . . . . . . . . . . . . . . 20
Figure 26. Standby driving circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 27. Turn-on diagnostic cycle. Positive and negative output behaviour. . . . . . . . . . . . . . . . . . . 23
Figure 28. Turn-on diag. cycle with transition in amp. mode. Positive and negative output behaviour 24
Figure 29. Short to GND and short to Vs, threshold description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 30. Short across the speaker and open load threshold description, in amplifier mode. . . . . . . 25
Figure 31. Short across the speaker and open load threshold description, in line driver mode. . . . . . 25
Figure 32. Thermal muting diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 33. Low voltage mute attenuation, supply voltage variation (Vs); result digital attenuation (At)29
Figure 34. TDM setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 35.I2 S format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 36. Audio data input format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 37. Audio interface timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 38.I2 C bus protocol description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 39. PowerSO36 (slug-up) mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . 43
Figure 40. Flexiwatt27 (vertical) mechanical data and package dimensions. . . . . . . . . . . . . . . . . . . . 44
Figure 41. Flexiwatt27 (horizontal) mechanical data and package dimensions. . . . . . . . . . . . . . . . . . 45
Figure 42. Flexiwatt27 (SMD) mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . 46
