ST TDA7404 User Manual
Features
■ 4 stereo inputs
■ 1 mono input
■ Soft-step volume
■ Bass, Treble and Loudness control
■ D i r e c t - m u t e a n d s o f t - m u t e
■ Internal beep
■ Four independent speaker outputs
■ Subwoofer stereo output
■ Digital control:
2
–I
C bus interface
– Audio filter characteristics programmable
Description
The TDA7404 is a high performance signal
processor specifically designed for car radio
applications.
Table 1. Device summary
TDA7404
Car radio signal processor
SO-28
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.
Order code Package Packing
TDA7404D SO-28 Tube
December 2008 Rev 2 1/35
www.st.com
1
Contents TDA7404
Contents
1 Detailed features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Block and pin description diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 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
4 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
2/35
TDA7404 Contents
5 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
6 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
7 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
3/35
List of tables TDA7404
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
4/35
TDA7404 List of figures
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 @ f
Figure 11. Bass center frequencies @ gain = 15 dB, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 12. Bass quality factors @ gain = 14 dB, f
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
= 80 Hz, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
C
= 80 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
C
5/35
Detailed features TDA7404
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)
● Vol u me
– 1 dB attenuator
– 100 dB range
– soft-step control with programmable times
● Bass
● Tre bl e
● Speaker
● Subwoofer
● Mute functions
nd
–2
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
nd
–2
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
– 4 independent speaker controls in 1 dB steps
– control range 50 dB with mute
– Zero crossing attenuate
– Stereo output
– attenuator range 50 dB
–direct mute
– digitally controlled Soft Mute with 4 programmable mute-times
6/35
TDA7404 Block and pin description diagrams
p
p
X
2 Block and pin description diagrams
Figure 1. Block diagram
COUTL
DiffinL
Diffgnd
DiffinR
SE1L
SE1R
SE2L
SE2R
SE3L
SE3R
Mono+
Mono -
lexer
ut Multi
In
MU
MIX
Gain/Auto Zero
Mono/Beep
COUTR
Mixing St age
Loudness
MUTE
Bass
Volu me
Treble
Soft Mute
Digital Control I2C-BusBeep
CINL
Zero Cross
CINR
Mono Fader
Mono Fader
Mono Fader
Mono Fader
Mono Fader
Mono Fader
Out LF
Out RF
Out LR
Out RR
SW L
SW R
SCL
SDA
Supply
VrefGnd Vcc
Figure 2. Pin connection (top view)
SE1L
SE1R
SE2L
SE2R
SE3L
SE3R
Mono+
Mono-
DiffinR
Difffgnd
DiffinL
ACINR
ACINL
CREF
1
2
3
4
5
6
7
8
9
10
11
12
13
14
ACOU TL
28
ACOU TR
27
VDD
26
SDA
25
SCL
24
MUTE
23
MUX
22
OUTLF
21
OUTLR
20
OUTRR
19
OUTRF
18
SWL
17
SWR
16
GND
15
7/35
Electrical specifications TDA7404
3 Electrical specifications
3.1 Supply
Table 2. Supply
Symbol Parameter Test condition Min. Typ. Max. Unit
V
Supply voltage 7.5 9 10.5 V
s
Supply current Vs = 9V 20 mA
I
s
SVRR Ripple rejection @ 1 kHz Audioprocessor (all Filters flat) 60 dB
3.2 Thermal data
Table 3. Thermal data
Symbol Parameter Value Unit
R
Th j-pins
Thermal resistance junction pins max 85 °C/W
3.3 Absolute maximum ratings
Table 4. Absolute maximum ratings
Symbol Parameter Value Unit
T
V
amb
T
s
stg
Operating supply voltage 10.8 V
Operating temperature range -40 to 85 °C
Storage temperature range -55 to +150 °C
3.4 ESD
All pins are protected against ESD according to the MIL883 standard.
8/35
TDA7404 Electrical specifications
3.5 Electrical characteristics
Table 5. Electrical characteristics
(V
=9 V; T
S
=25 °C; RL=10 kΩ; all gains = 0 dB; f = 1 kHz; unless otherwise specified)
amb
Symbol Parameter Test conditions Min. Typ. Max. Unit
Input selector
V
S
G
IN MIN
G
IN MAX
G
R
STEP
Input resistance all single ended Inputs 70 100 130 kΩ
in
Clipping level 2.20 2.60 V
CL
Input separation 80 100 dB
IN
Min. input gain -1 0 1 dB
Max. input gain 18 20 22 dB
Step Resolution 0.5 1 1.5 dB
Adjacent gain steps -5 1 5 mV
V
V
offset
DC Steps
DC
G
MIN
to G
MAX
-10 5 10 mV
Remaining offset with AutoZero 0.5 mV
P differential stereo inputs
R
Input resistance
in
(see Figure 3)
Differential 70 100 130 kΩ
-0.75 0 0.75 dB
CD
Gain
G
only at true differential
input
-5 -6 -7 dB
-11 -12 -13 dB
V
CMRR Common mode rejection ratio
e
Output noise @ speaker-outputs
NO
= 1 V
CM
V
= 1 V
CM
20 Hz - 20 kHz, flat;
all stages 0 dB
@ 1 kHz 40 70 dB
RMS
@ 10 kHz 40 60 dB
RMS
9V
RMS
Differential mono input
R
Input resistance Differential 395673kΩ
in
CMRR Common mode rejection ratio
Beep control
V
Beep level 250 350 500 mV
RMS
f
Beep frequency
B
V
= 1 V
CM
= 1 V
V
CM
f
B1
f
B2
f
B3
@ 1 kHz 40 70 dB
RMS
@ 10 kHz 40 60 dB
RMS
740 781 820 Hz
1.48 1.56 1.64 kHz
1.7 1.8 1.9 kHz
9/35
Electrical specifications TDA7404
Table 5. Electrical characteristics (continued)
(V
=9 V; T
S
Symbol Parameter Test conditions Min. Typ. Max. Unit
Mixing control
=25 °C; RL=10 kΩ; all gains = 0 dB; f = 1 kHz; unless otherwise specified)
amb
Main / mix-source 0/00 dB
M
LEVEL
Mixing level
Volu m e co n t rol
G
A
A
V
STEP
E
Max. gain 283032 dB
MAX
Max. attenuation -83 -79 -75 dB
MAX
Step resolution 0.5 1 1.5 dB
Attenuation set error
A
Tracking error 2 dB
E
T
DC steps
DC
Loudness control
A
A
STEP
Step resolution -0.5 1 1.5 dB
Max. attenuation 13 15 17 dB
MAX
f
Center frequency
C
Main / mix-source
-8.5/-
10.6
-3.5/-
9.6
-2.5/-
8.6
dB
Main / mix-source -5/-5 -6/-6 -7/-7 dB
Main / mix-source
-11/-
1.5
-12/-
2.5
-13/-
3.5
dB
G = -20 to +20 dB -1 0 1 dB
G = -80 to -20 dB -4 0 3 dB
Adjacent steps 0.1 3 mV
From 0 dB to G
MIN
0.5 5 mV
360 400 440 Hz
720 800 880 Hz
2.3 2.4
(1)
2.5 kHz
Soft-mute
A
MUTE
Mute attenuation 80 100 dB
T1 0.48 1 ms
T2 0.96 2 ms
Delay time
T
D
T3 20 30.7 50 ms
T4 70 123 170 ms
V
TH low
V
TH high
R
V
Low threshold for SM pin
High threshold for SM pin 2.50 V
Internal pull-up resistor 70 100 130 kΩ
PU
Pull-up voltage 5 V
PU
(2)
10/35
1V
TDA7404 Electrical specifications
Table 5. Electrical characteristics (continued)
(V
=9 V; T
S
Symbol Parameter Test conditions Min. Typ. Max. Unit
Soft-step
=25 °C; RL=10 kΩ; all gains = 0 dB; f = 1 kHz; unless otherwise specified)
amb
T
SW
Switch time
Bass control
C
RANGE
A
STEP
Q
BASS
DC
Control range +14 +15 +16 dB
Step resolution 0.5 1 1.5 dB
Center frequency
f
C
Quality factor
Bass DC gain
GAIN
T
T
T
T
f
f
f
f
Q
Q
Q
Q
SW1
SW2
SW3
SW4
C1
C2
C3
C4
54 60 66 Hz
72 80 88 Hz
90 100 110 Hz
180 200 220 Hz
1
2
3
4
0.911.1
1.11.251.4
1.3 1.5 1.7
1.822.2
0.68 ms
1.26 ms
2.52 ms
5.04 ms
DC = off -1 0 1 dB
DC = on 4 4.4 6 dB
Treble control
C
RANGE
A
STEP
Control range +14 +15 +16 dB
Step resolution 0.5 1 1.5 dB
Center frequency
f
C
Speaker attenuator
C
RANGE
A
STEP
A
MUTE
E
V
T
V
Control range -53 50 -47 dB
Step resolution Only for attenuation up to 24 dB 0.5 1 1.5 dB
Output mute attenuation 80 90 dB
Attenuation set error -2 2 dB
E
DC steps Adjacent attenuation steps 0.10 5 mV
DC
Zero cross timer Data bit D1=1, D2=1 29 37 45 ms
ZC
Zero cross threshold +20 mV
th
f
C1
f
C2
f
C3
f
C4
81012kHz
10 12.5 15 kHz
12 15 18 kHz
14 17.5 21 kHz
11/35
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