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.
– 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
TDA7404Block 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
VrefGndVcc
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 specificationsTDA7404
3 Electrical specifications
3.1 Supply
Table 2.Supply
SymbolParameterTest conditionMin.Typ.Max.Unit
V
Supply voltage7.5910.5V
s
Supply currentVs = 9V20mA
I
s
SVRRRipple rejection @ 1 kHzAudioprocessor (all Filters flat)60 dB
3.2 Thermal data
Table 3.Thermal data
SymbolParameterValueUnit
R
Th j-pins
Thermal resistance junction pinsmax85°C/W
3.3 Absolute maximum ratings
Table 4.Absolute maximum ratings
SymbolParameterValueUnit
T
V
amb
T
s
stg
Operating supply voltage10.8V
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
TDA7404Electrical 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
SymbolParameterTest conditionsMin.Typ.Max.Unit
Input selector
V
S
G
IN MIN
G
IN MAX
G
R
STEP
Input resistanceall single ended Inputs70100130kΩ
in
Clipping level2.202.60V
CL
Input separation80100 dB
IN
Min. input gain -101 dB
Max. input gain182022 dB
Step Resolution0.511.5 dB
Adjacent gain steps-515mV
V
V
offset
DC Steps
DC
G
MIN
to G
MAX
-10510mV
Remaining offset with AutoZero0.5mV
P differential stereo inputs
R
Input resistance
in
(see Figure 3)
Differential70100130kΩ
-0.7500.75 dB
CD
Gain
G
only at true differential
input
-5-6-7 dB
-11-12-13 dB
V
CMRRCommon 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 kHz4070 dB
RMS
@ 10 kHz4060 dB
RMS
9V
RMS
Differential mono input
R
Input resistanceDifferential395673kΩ
in
CMRRCommon mode rejection ratio
Beep control
V
Beep level250350500mV
RMS
f
Beep frequency
B
V
= 1 V
CM
= 1 V
V
CM
f
B1
f
B2
f
B3
@ 1 kHz4070 dB
RMS
@ 10 kHz4060 dB
RMS
740781820Hz
1.481.561.64kHz
1.71.81.9kHz
9/35
Electrical specificationsTDA7404
Table 5.Electrical characteristics (continued)
(V
=9 V; T
S
SymbolParameterTest conditionsMin.Typ.Max.Unit
Mixing control
=25 °C; RL=10 kΩ; all gains = 0 dB; f = 1 kHz; unless otherwise specified)
amb
Main / mix-source0/00 dB
M
LEVEL
Mixing level
Volu m e co n t rol
G
A
A
V
STEP
E
Max. gain283032 dB
MAX
Max. attenuation-83-79-75 dB
MAX
Step resolution0.511.5 dB
Attenuation set error
A
Tracking error2 dB
E
T
DC steps
DC
Loudness control
A
A
STEP
Step resolution-0.511.5 dB
Max. attenuation131517 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-101 dB
G = -80 to -20 dB-403 dB
Adjacent steps0.13mV
From 0 dB to G
MIN
0.55mV
360400440Hz
720800880Hz
2.32.4
(1)
2.5kHz
Soft-mute
A
MUTE
Mute attenuation80100 dB
T10.481ms
T20.962ms
Delay time
T
D
T32030.750ms
T470123170ms
V
TH low
V
TH high
R
V
Low threshold for SM pin
High threshold for SM pin2.50V
Internal pull-up resistor70100130kΩ
PU
Pull-up voltage5V
PU
(2)
10/35
1V
TDA7404Electrical specifications
Table 5.Electrical characteristics (continued)
(V
=9 V; T
S
SymbolParameterTest conditionsMin.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 resolution0.511.5 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
546066Hz
728088Hz
90100110Hz
180200220Hz
1
2
3
4
0.911.1
1.11.251.4
1.31.51.7
1.822.2
0.68ms
1.26ms
2.52ms
5.04ms
DC = off-101 dB
DC = on44.46 dB
Treble control
C
RANGE
A
STEP
Control range +14 +15 +16 dB
Step resolution0.511.5 dB
Center frequency
f
C
Speaker attenuator
C
RANGE
A
STEP
A
MUTE
E
V
T
V
Control range-5350-47 dB
Step resolutionOnly for attenuation up to 24 dB0.511.5 dB
Output mute attenuation8090 dB
Attenuation set error-22 dB
E
DC stepsAdjacent attenuation steps0.105mV
DC
Zero cross timerData bit D1=1, D2=1293745ms
ZC
Zero cross threshold+20mV
th
f
C1
f
C2
f
C3
f
C4
81012kHz
1012.515kHz
121518kHz
1417.521kHz
11/35
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