TDA7719TR ,3 BAND CAR AUDIO PROCESSORElectrical characteristics . . . . . . . 94 Description 134.1 Input configuration . ..
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TDA7850 ,Quad BTL output with HSD/offset detection, stand-by and mute inputsBlock diagram . . . . 5Figure 2. Standard test and application circuit . . . 5Figure 3. ..
TDA7850A ,Quad BTP output with HSD, offset detection , stand-by and mute inputsFeatures■ High output power capability:–4 x 50 W/4 max.–4 x 30 W/4 @ 14.4 V, 1 kHz, 10 %–4 x 80 ..
TDA7850H ,Quad BTL output with HSD/offset detection, stand-by and mute inputsFeatures■ High output power capability:–4 x 50 W/4 max.–4 x 30 W/4 @ 14.4 V, 1 kHz, 10 %–4 x 80 ..
TDA7851A ,Quad BTL output with stand-by and mute inputs, clip and offset detectionFeatures■ Multipower BCD technology■ High output power capability:–4 x 48 W/4 Max.–4 x 28 W/4 @ ..
THS4501CDGN ,High-Speed Fully Differential Amplifier, +/-5 V SLOS350F–APRIL 2002–REVISED OCTOBER 2011(1)PACKAGE/ORDERING INFORMATIONORDERABLE PACKAGE AND NUMBE ..
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THS4502CD ,High-Speed Fully-Differential AmplifiersMAXIMUM RATINGS(1)over operating free-air temperature range unless otherwise notedUNITSupply voltag ..
THS4502ID ,High-Speed Fully-Differential Amplifiers SLOS352E–APRIL 2002–REVISED OCTOBER 2011Wideband, Low-Distortion Fully Differential AmplifiersChec ..
THS4502IDG4 ,High-Speed Fully-Differential Amplifiers 8-SOIC -40 to 85FEATURES DESCRIPTIONThe THS4502 and THS4503 are high-performance2• Fully Differential Architecturef ..
TDA7719-TDA7719TR
3 BAND CAR AUDIO PROCESSOR
September 2013 Doc ID 13698 Rev 5 1/46
TDA77193 band car audio processor
Features Input multiplexer Multiple input configuration for different
application Loudnessnd order frequency response Programmable center frequency 15 dB with 1 dB steps Selectable high frequency boost Selectable flat-mode Volume +15 dB to -15 dB with 1 dB step resolution Soft-step control with programmable blend
times Bassnd order frequency response Center frequency programmable in 4 steps Q programmable 1.0/1.25/1.5/2.0 DC gain programmable -15 to 15 dB range with 1 dB resolution Middlend order frequency response Center frequency programmable in 4 steps Q programmable 0.5/0.75/1.0/1.25 -15 to 15dB range with 1dB resolution Treblend order frequency response Center frequency programmable in 4 steps -15 to 15dB range with 1dB resolution Speaker 4 independent soft step speaker controls 0dB to -79dB with 1dB steps
–Direct mute Subwoofernd order low pass filter with programmable
cut off frequency 2 independent soft step level control, Mute functions
Contents TDA77192/46 Doc ID 13698 Rev 5
Contents Block circuit diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72.1 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93.1 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134.1 Input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1.1 Front and rear selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1.2 Direct path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.2 Mixing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.3 Loudness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.3.1 Loudness attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.3.2 Peak frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.3.3 High frequency boost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.3.4 Flat mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.4 SoftMute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.5 Softstep volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.6 Bass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.6.1 Bass attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.6.2 Bass center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.6.3 Bass quality factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.6.4 DC mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.7 Middle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.7.1 Middle attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.7.2 Middle center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.7.3 Middle quality factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.8 T reble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
TDA7719 ContentsDoc ID 13698 Rev 5 3/46
4.8.1 Treble attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.8.2 Treble center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.9 Subwoofer Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.10 Softstep control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.11 DC offset detector and level meter option . . . . . . . . . . . . . . . . . . . . . . . . 25
4.12 DC offset detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.13 Level meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.14 Output gain control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.15 Audioprocessor testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.16 T est circuit (3 x QD + 1 x FD + DC offset detector) . . . . . . . . . . . . . . . . . 27
2 C bus specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285.1 Interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.1.1 Receive mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.1.2 Transmission mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.1.3 Reset condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.2 Data byte specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
List of tables TDA7719
4/46 Doc ID 13698 Rev 5
List of tables
Table 1. Device summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 3. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 4. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 5. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 6. Input pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 7. Selector configuration matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 8. Available sources for mixing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 9. I2 C bus electrical characterisitics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Table 10. Subaddress (receive mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Table 11. Input configuration / main selector (0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Table 12. 2nd Source selector / direct path (1). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Table 13. Mixing source / mixing gain (2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Table 14. Mix control / level meter / dc offset detector configure (3) . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 15. Soft mute / others (4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Table 16. SoftStep I (5). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Table 17. SoftStep II / DC detector (6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Table 18. Loudness (7). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Table 19. Volume / output gain (8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Table 20. Treble filter (9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Table 21. Middle filter (10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Table 22. Bass filter (11). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Table 23. Subwoofer / middle / bass (12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Table 24. Speaker attenuation (LF/RF/LR/RR) (13-16) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Table 25. Subwoofer attenuation (subwoofer L/subwoofer R) (17-18) . . . . . . . . . . . . . . . . . . . . . . . . 41
Table 26. Testing audio processor 1 (19) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Table 27. Testing audio processor 2 (20) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Table 28. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
TDA7719 List of figures
Doc ID 13698 Rev 5 5/46
List of figures
Figure 1. Block circuit diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 2. Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 3. QD and FD configuration of QD4/FD4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 4. Block diagram of mixing stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 5. Loudness attenuation @ fP = 400 Hz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 6. Loudness center frequencies @ Attn. = 15 dB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 7. Loudness attenuation, fc =2.4 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 8. SoftMute timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 9. Bass Control @ fc = 80 Hz, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 10. Bass center frequencies @ gain = 14 dB, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 11. Bass quality factors @ gain = 14 dB, fc = 80 Hz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 12. Bass normal and DC mode @ Gain = 14 dB, fc = 80 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 13. Middle control @ fc = 1 kHz, Q = 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 14. Middle center frequencies @ gain = 14d B, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 15. Middle quality factors @ gain = 14 dB, fc = 1 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 16. Treble Control @ fc = 17.5 kHz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 17. Treble center frequencies @ gain = 14 dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 18. Subwoofer control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 19. DC offset detection circuit (simplified) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 20. Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 21. Switching characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 22.I2 C timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 23. TSSOP28 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Block circuit diagram TDA7719 Block circuit diagram
Figure 1. Block circuit diagram
TDA7719 Pin description
Doc ID 13698 Rev 5 7/46
2 Pin description
2.1 Pin connection
Figure 2. Pin connection (top view)
2.2 Pin description
Table 2. Pin description
Pin description TDA7719
8/46 Doc ID 13698 Rev 5
Table 2. Pin description (continued)
TDA7719 Electrical specifications
Doc ID 13698 Rev 5 9/46
3 Electrical specifications
3.1 Thermal data
3.2 Absolute maximum ratings
3.3 Electrical characteristics
VS = 8.5 V; Tamb= -40 to 85 °C; RL= 10 k; all gains = 0 dB; f = 1 kHz; unless otherwise
specified
Table 3. Thermal data
Table 4. Absolute maximum ratings
Table 5. Electrical characteristics
Electrical specifications TDA7719
10/46 Doc ID 13698 Rev 5
Table 5. Electrical characteristics (continued)
TDA7719 Electrical specifications
Doc ID 13698 Rev 5 11/46
Table 5. Electrical characteristics (continued)
Electrical specifications TDA7719
12/46 Doc ID 13698 Rev 5 When DC offset detector is not used, the impedance of mono single-ended input is 50 k instead of 100 k.
Table 5. Electrical characteristics (continued)
TDA7719 Description
Doc ID 13698 Rev 5 13/46
4 Description
4.1 Input configuration
4.1.1 Front and rear selector
The input stage (Main source and 2nd source) is configurable to adapt to different
application. There are 7 different configurations which provide different input structure and
different number of input sources as shown below. 4 x QD, 2 x QD + 3 x SE, 1 x QD + 5 x SE, 1 x QD + 3 x SE + 2 x MD, 3 x QD + 1 x FD, 3 x QD + 2 x SE, 1 x QD + 2 x SE + 1 x FD + 1 x MD, 1 x QD + 3 x SE + 1 x FD
Note: QD = Quasi-Differential, SE = Single-ended input, FD = Full Differential, MD = mono
Differential
The configuration of the input stage is controlled by ‘Input Configuration’ bits in I2 C control
table (Byte0 Bit5~Bit7). The table below shows the configuration of input pins in different
configurations.
Table 6. Input pin configuration
Description TDA7719
14/46 Doc ID 13698 Rev 5
With different input configuration, the input source can be selected with input selector
(Byte0/1 Bit0~Bit2). The following matrix defines the selector configuration of different input
sources dependant on the configuration bits.
Note: In each configuration, only the light grey cells are allowed. The dark grey cells are not
allowed.
MD1/MD2 selection is defined by extra bit – ‘MD1/2 selection’ in I2 C control table (Bit3 of
Byte0/1).
The input stage can be configured to 0dB or 3dB gain with I2 C bus. The 0dB configuration
allows up to 2Vrms input signal level, while with 3dB gain, the internal signal will start to clip
when input signal level is higher than 1.414Vrms.
The Pin10~Pin13 can be configured as full differential input stage or quasi-differential input.
When it is configured as quasi-differential input, both Pin11 and Pin12 are used as the QD
common input pins. These two pins must be connected together externally in application. In
this case the input impedance of QD4 common is reduced to 50k (half of QD4 left and
right input). The diagram below shows both QD and FD configuration of QD4/FD4.
Table 7. Selector configuration matrix
TDA7719 Description
Doc ID 13698 Rev 5 15/46
Figure 3. QD and FD configuration of QD4/FD4
4.1.2 Direct path
The input pins can be configured as direct path mode by setting Byte1 Bit5~Bit7. In direct
path mode the input pins are connected to dedicated mono fader directly, all the filters and
volume are bypassed. Below is described the assignment of the input pins and output fader
in direct path mode:
Pin5/QD2L --> OUTLF
Pin6/QD2R --> OUTRF
Pin7/QD3L --> OUTLR
Pin9/QD3R --> OUTRR
Pin10/FDL+_QD4L --> OUTL2
Pin13/FDR+_QD4R--> OUTR2
Note: 1 The configurations CFG2, CFG3 and CFG5 are not recommended in direct path mode.
Because in these 3 configurations SE4L/MD1+ and SE5R/MD2+ are connected to OUT2_L
and OUT2_R fader separately. In this case left and right channel of OUT2 belongs to
different input sources. If the direct path is chosen, the input pins have to be used as single ended pins. In case of
differential inputs the ground or minus pins must be connect to GND by AC short. Inputs in direct path mode are also selectable with front and rear selector.
Description TDA7719
16/46 Doc ID 13698 Rev 5
4.2 Mixing
The device provides mixing function which allows the mixing source mixed into front and
rear speaker output independently. The mixing source can be any single-ended input,
mono-differential input or beep input (Mono single-ended input when DC offset detector is
not used). In order to adjust the level of mixing signal, the mixing selector is followed with a dB~-31 dB attenuator. The maximum mixing input signal level is 1.6 Vrms for single-ended
input and mono-differential input. For beep input, the maximum input signal level is about
1.4 Vrms. The block diagram of the mixing function is shown below.
Figure 4. Block diagram of mixing stage
Since the input stage of this device has different configurations, the corresponding sources
for mixing selector are also different according to the configurations. The following table
defines the available sources for mixing under different configurations.
Note: Only light grey cells are allowed mixing input. The dark grey cells are not allowed.
The beep input is available only when DC offset detector function is not used.
Table 8. Available sources for mixing
TDA7719 Description
Doc ID 13698 Rev 5 17/46
4.3 Loudness
There are four parameters programmable in the loudness stage:
4.3.1 Loudness attenuation
Figure 5 shows the attenuation as a function of frequency at fP = 400 Hz
Figure 5. Loudness attenuation @ fP = 400 Hz.
4.3.2 Peak frequency
Figure 6 shows the four possible peak-frequencies at 400, 800 and 2400 Hz
Figure 6. Loudness center frequencies @ Attn. = 15 dB.
Description TDA7719
18/46 Doc ID 13698 Rev 5
4.3.3 High frequency boost
Figure 7 shows the different Loudness shapes in low and high frequency boost.
Figure 7. Loudness attenuation, fc =2.4 kHz
4.3.4 Flat mode
In flat mode the loudness stage works as a 0dB to -15dB attenuator.
4.4 SoftMute
The digitally controlled SoftMute stage allows muting/demuting the signal with a I2 C-bus
programmable slope. The mute process can either be activated by the SoftMute pin or by
the I2 C-bus. This slope is realized in a special S-shaped curve to mute slow in the critical
regions (see Figure8).
For timing purposes the Bit0 of the I2 C-bus output register is set to 1 from the start of muting
until the end of demuting.
Figure 8. SoftMute timing A started Mute action is always terminated and could not be interrupted by a change of the mute signal.
TDA7719 Description
Doc ID 13698 Rev 5 19/46
4.5 Softstep volume
When the volume-level is changed audible clicks could appear at the output. The root cause
of those clicks could either be a DC Offset before the volume-stage or the sudden change of
the envelope of the audio signal. With the Softstep feature both kinds of clicks could be
reduced to a minimum and are no more audible. The blend-time from one step to the next is
programmable as 5 ms or 10 ms. The softstep control is described in detail in Chapter 4.10.
4.6 Bass
There are four parameters programmable in the bass stage:
4.6.1 Bass attenuation
Figure 9 shows the attenuation as a function of frequency at a center frequency of 80 Hz.
Figure 9. Bass Control @ fc = 80 Hz, Q = 1
4.6.2 Bass center frequency
Figure 10 shows the four possible center frequencies 60, 80, 100 and 200 Hz.
Figure 10. Bass center frequencies @ gain = 14 dB, Q = 1
Description TDA7719
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4.6.3 Bass quality factors
Figure 11 shows the four possible quality factors 1, 1.25, 1.5 and 2.
Figure 11. Bass quality factors @ gain = 14 dB, fc = 80 Hz
4.6.4 DC mode
In this mode the DC gain is increased by 4.4 dB. In addition the programmed center
frequency and quality factor is decreased by 25 % which can be used to reach alternative
center frequencies or quality factors.
Figure 12. Bass normal and DC mode @ Gain = 14 dB, fc = 80 Hz The center frequency, Q and DC-mode can be set fully independently.
TDA7719 Description
Doc ID 13698 Rev 5 21/46
4.7 Middle
There are three parameters programmable in the middle stage:
4.7.1 Middle attenuation
Figure 13 shows the attenuation as a function of frequency at a center frequency of 1 kHz.
Figure 13. Middle control @ fc = 1 kHz, Q = 1
4.7.2 Middle center frequency
Figure 14 shows the four possible center frequencies 500 Hz, 1 kHz, 1.5 kHz and 2.5 kHz.
Figure 14. Middle center frequencies @ gain = 14d B, Q = 1
Description TDA7719
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4.7.3 Middle quality factors
Figure 15 shows the four possible quality factors 0.5, 0.75, 1 and 1.25.
Figure 15. Middle quality factors @ gain = 14 dB, fc = 1 kHz
4.8 Treble
There are two parameters programmable in the treble stage:
4.8.1 Treble attenuation
Figure 16 shows the attenuation as a function of frequency at a center frequency of 17.5 kHz.
Figure 16. Treble Control @ fc = 17.5 kHz.
TDA7719 Description
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4.8.2 Treble center frequency
Figure 17 shows the four possible center frequencies 10 k, 12.5 k, 15 k and 17.5 kHz.
Figure 17. Treble center frequencies @ gain = 14 dB
4.9 Subwoofer Filter
The subwoofer lowpass filter has Butterworth characteristics with programmable cut-off
frequency (80 / 120 / 160 Hz). The output phase can be selected between 0 deg and
180 deg. The input of subwoofer takes signal from bass filter output or output of input mux.
Figure 18. Subwoofer control
