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E-TDA7404DTR |ETDA7404DTRSTN/a3000avaiCar Radio Signal Processor
E-TDA7404D |ETDA7404DSTN/a200avaiCar Radio Signal Processor
E-TDA7404DTR |ETDA7404DTRST,STN/a20000avaiCar Radio Signal Processor
E-TDA7404DTR |ETDA7404DTRSTMN/a10000avaiCar Radio Signal Processor


E-TDA7404DTR ,Car Radio Signal ProcessorFeatures• 4 stereo inputs• 1 mono input• Soft-step volume• Bass, Treble and Loudness control• Direc ..
E-TDA7404DTR ,Car Radio Signal ProcessorElectrical characteristics . . . . . . . 94 Description of functionality . . 134.1 Input s ..
E-TDA7404DTR ,Car Radio Signal Processorapplications. Table 1. Device summaryOrder code Package PackingTDA7404D SO-28 TubeSeptembe ..
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E-TDA7404D-E-TDA7404DTR
Car Radio Signal Processor
September 2013 Rev 3 1/35TDA7404
Car radio signal processor
Features
4 stereo inputs 1 mono input Soft-step volume Bass, Treble and Loudness control Direct -mute and soft-mute Internal beep Four independent speaker outputs Subwoofer stereo output Digital control:2 C bus interface Audio filter characteristics programmable
Description

The TDA7404 is a high performance signal
processor specifically designed for car radio
applications.
The device includes a high performance
audioprocessor with fully integrated audio filters.
The digital control allows a programming in a wide
range of all the filter characteristics. By the use of
a BiCMOS process and a linear signal processing
low distortion and low noise are obtained.

Table 1. Device summary
Contents TDA7404
2/35
Contents Detailed features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Block and pin description diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.1 Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.3 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.4 ESD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Description of functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1 Input stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2 AutoZero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2.1 AutoZero remain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.3 Mixing stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.4 Loudness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.4.1 Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.4.2 Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.4.3 Low and high frequency boost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.5 Soft-mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.6 Soft-step volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.7 Bass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.7.1 Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.7.2 Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.7.3 Quality factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.7.4 DC mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.8 Treble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.8.1 Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.8.2 Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.9 External AC - coupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.10 Speaker attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.11 Subwoofer attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
TDA7404 Contents
3/35 I2C bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.1 Interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.2 Transmitted data (send mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.3 Reset condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.4 Subaddress (receive mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.5 Data byte specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
List of tables TDA7404
4/35
List of tables

Table 1. Device summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 3. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 4. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 5. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 6. Others selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Table 7. Subaddress (receive mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 8. Input selector / gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 9. Loudness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table 10. Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table 11. Treble programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Table 12. Bass programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Table 13. Speaker attenuator left front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Table 14. Speaker attenuator right front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Table 15. Speaker attenuator left rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Table 16. Speaker attenuator right rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Table 17. Subwoofer attenuator (left and right) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Table 18. Soft-mute and mixing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Table 19. Others . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Table 20. Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Table 21. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
TDA7404 List of figures
5/35
List of figures

Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 2. Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 3. Input stages diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 4. Signal-flow of mixing-stage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 5. Loudness attenuation @ fC = 400 Hz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 6. Loudness center frequencies @ Attn. = 15 dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 7. Loudness attenuation, fC = 2.4 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 8. Soft-mute timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 9. Soft-step timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 10. Bass control @ fC = 80 Hz, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 11. Bass center frequencies @ gain = 15 dB, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 12. Bass quality factors @ gain = 14 dB, fC = 80 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 13. Bass normal and DC mode @ gain = 14 dB, fC = 80 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 14. Treble control @ fC = 17.5kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 15. Treble center frequencies @ Gain = 15 dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 16. External AC coupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 17. Software specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 18. TDA7404 application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 19. SO-28 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Detailed features TDA7404
6/35
1 Detailed features
Input multiplexer 1 pseudo-differential stereo input (selectable single end stereo input) 3 single-end stereo inputs 1 differential mono input In-Gain 0..14 dB, 1 dB steps, 14..20 dB, 2 dB steps Auto Zero Beep internal beep with 3 frequencies 781 Hz/1.56 kHz/1.8 kHz Mixing stage 4 step-mixing-stage with mono or beep as mix-signals Loudness second order frequency response programmable center frequency 15 x 1 dB steps selectable low and high frequency boost selectable flat-mode (constant attenuation) Volume 1 dB attenuator 100 dB range soft-step control with programmable times Bassnd order frequency response center frequency programmable in 4 steps 60 Hz / 80 Hz / 100 Hz / 200 Hz Q programmable 1.0/1.25/1.5/2.0 DC gain programmable
–+15 dB x 1 dB steps Treblend order frequency response center frequency programmable in 4 steps 10 kHz / 12.5 kHz / 15 kHz / 17.5 kHz
–+15 dB x 1 dB steps Speaker 4 independent speaker controls in 1 dB steps control range 50 dB with mute Zero crossing attenuate Subwoofer Stereo output attenuator range 50 dB Mute functions direct mute digitally controlled Soft Mute with 4 programmable mute-times
TDA7404 Block and pin description diagrams
7/35 Block and pin description diagrams
Figure 1. Block diagram
Electrical specifications TDA7404
8/35
3 Electrical specifications
3.1 Supply


3.2 Thermal data


3.3 Absolute maximum ratings


3.4 ESD

All pins are protected against ESD according to the MIL883 standard.
Table 2. Supply
Table 3. Thermal data
Table 4. Absolute maximum ratings
TDA7404 Electrical specifications
9/35
3.5 Electrical characteristics

Table 5. Electrical characteristics
(VS =9 V; Tamb=25 °C; RL=10 k; all gains = 0 dB; f = 1 kHz; unless otherwise specified)
Electrical specifications TDA7404
10/35
Table 5. Electrical characteristics (continued)

(VS =9 V; Tamb=25 °C; RL=10 k; all gains = 0 dB; f = 1 kHz; unless otherwise specified)
TDA7404 Electrical specifications
11/35
Table 5. Electrical characteristics (continued)

(VS =9 V; Tamb=25 °C; RL=10 k; all gains = 0 dB; f = 1 kHz; unless otherwise specified)
Electrical specifications TDA7404
12/35 The SM-Pin is active low (Mute = 0). Center frequency 2.4 kHz makes 1kHz bottom frequency at low and high frequency boost condition.
Table 5. Electrical characteristics (continued)

(VS =9 V; Tamb=25 °C; RL=10 k; all gains = 0 dB; f = 1 kHz; unless otherwise specified)
TDA7404 Description of functionality Description of functionality
4.1 Input stages

Most of the input stages have remained the same as in preceding ST-Audioprocessors with
exception of the CD-inputs (see Figure 3). In the meantime there are some CD-players in
the market which have a significant high source-impedance which effects strongly the
common-mode-rejection of the normal differential input stage.
The additional buffer of the TDA7404 Diff: input avoids this drawback and offers the full common-mode-rejection even with those
CD-players.
Figure 3. Input stages diagram
It is possible that the Differential input is switched a single ended input (SE4) like SE1.. 3.
Description of functionality TDA7404
14/35
4.2 AutoZero

In order to reduce the number of pins there is no AC coupling between the In-Gain and the
following stage, so that any offset generated by or before the In-Gain-stage would be
transferred or even amplified to the output. To avoid that effect a special Offset-cancellation-
stage called AutoZero is implemented. This stage is located before the Mixing-block to
eliminate all offsets generated by the Input-Stages and the In-Gain (Please notice that
externally generated offsets, e.g. generated through the leakage current of the coupling
capacitors, are not canceled).
The auto-zeroing is started every time the DATA-BYTE 0 (Input Selector/Gain) is selected
and takes a time of max. 0.3ms. To avoid audible clicks the Audioprocessor is muted before
the loudness stage during this time.
4.2.1 AutoZero remain

In some cases, for example if the µP is executing a refresh cycle of the IIC-Bus-
programming, it is not useful to start a new AutoZero-action because no new source is
selected and an undesired mute would appear at the outputs. For such applications the
TDA7404 could be switched in the AutoZero-Remain-Mode (I2 bit of the subaddress-byte).
If this bit is set to high, the DATABYTE 0 could be loaded without invoking the AutoZero and
the old adjustment-value remains.
4.3 Mixing stage

The 4 step Mixing stage offers the possibility to mix the rear selector signal or the phone
signal to any other source. Due to the fact that the mixing-stage is located behind the In-
Gain-stage fine adjustments of the main source level could be done in this way.
Figure 4. Signal-flow of mixing-stage
TDA7404 Description of functionality
4.4 Loudness

There are four parameters programmable in the loudness stage:
4.4.1 Attenuation

Figure 5 shows the attenuation as a function of frequency at fC = 400 Hz.
Figure 5. Loudness attenuation @ fC = 400 Hz
4.4.2 Center frequency

Figure 6 shows the three possible peak-frequencies 400 Hz, 800 Hz and 2.4 kHz.
Figure 6. Loudness center frequencies @ Attn. = 15 dB
Description of functionality TDA7404
4.4.3 Low and high frequency boost

Figure 7 shows the different Loudness-shapes in low & high frequency boost.
Figure 7. Loudness attenuation, fC = 2.4 kHz
4.5 Soft-mute

The digitally controlled soft-mute stage allows muting/demuting the signal with a I2 C bus
programmable slope. The mute process can either be activated by the Mute pin or by the 2 C bus. This slope is realized in a special S-shaped curve to mute slow in the critical
regions (seeFigure6).
For timing purposes the Bit 0 of the I2 C bus output register is set to 1 from the start of muting
until the end of de-muting.
Figure 8. Soft-mute timing
Please notice that a started Mute-action is always terminated and could not be interrupted by a change of the mute -signal.
TDA7404 Description of functionality
4.6 Soft-step 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 audiosignal. With the soft-step feature both kinds of clicks could be
reduced to a minimum and are no more audible. Four programmable soft step time from one
step to the next, are user selectable.
Figure 9. Soft-step timing
For steps more than 1 dB the soft-step mode should be deactivated because it could generate a 1 dB error during the blend-time.
4.7 Bass

There are three parameters programmable in the bass stage:
4.7.1 Attenuation

Figure 10 shows the attenuation as a function of frequency at a center frequency of 80Hz.
Figure 10. Bass control @ fC = 80 Hz, Q = 1
Description of functionality TDA7404
4.7.2 Center frequency

Figure 11 shows the four possible center frequencies 60, 80,100 and 200 Hz.
Figure 11. Bass center frequencies @ gain = 15 dB, Q = 1
4.7.3 Quality factors

Figure 12 shows the four possible quality factors 1, 1.25, 1.5 and 2.
Figure 12. Bass quality factors @ gain = 14 dB, fC = 80 Hz
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