E-TDA7404DTR [STMICROELECTRONICS]
1 CHANNEL(S), TONE CONTROL CIRCUIT, PDSO28, SOP-28;
| 型号： | E-TDA7404DTR |
| 厂家： | 
ST |
| 描述： | 1 CHANNEL(S), TONE CONTROL CIRCUIT, PDSO28, SOP-28 信息通信管理 光电二极管 商用集成电路 |
| 文件： | 总35页 (文件大小：455K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TDA7404
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
SO-28
Four independent speaker outputs
Subwoofer stereo output
Digital control:
2
– I C bus interface
– Audio filter characteristics programmable
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.
Description
The TDA7404 is a high performance signal
processor specifically designed for car radio
applications.
Table 1.
Device summary
Order code
Package
SO-28
Packing
TDA7404D
Tube
September 2013
Rev 3
1/35
www.st.com
1
Contents
TDA7404
Contents
1
2
3
Detailed features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Block and pin description diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1
3.2
3.3
3.4
3.5
Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
ESD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4
Description of functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1
4.2
Input stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
AutoZero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2.1
AutoZero remain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.3
4.4
Mixing stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Loudness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.4.1
4.4.2
4.4.3
Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Low and high frequency boost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.5
4.6
4.7
Soft-mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Soft-step volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Bass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.7.1
4.7.2
4.7.3
4.7.4
Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Quality factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
DC mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.8
4.9
Treble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.8.1
4.8.2
Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
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
5.2
5.3
5.4
5.5
Interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Transmitted data (send mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Reset condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Subaddress (receive mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Data byte specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6
7
8
Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
3/35
List of tables
TDA7404
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Table 11.
Table 12.
Table 13.
Table 14.
Table 15.
Table 16.
Table 17.
Table 18.
Table 19.
Table 20.
Table 21.
Device summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Others selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Subaddress (receive mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Input selector / gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Loudness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Treble programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Bass programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Speaker attenuator left front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Speaker attenuator right front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Speaker attenuator left rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Speaker attenuator right rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Subwoofer attenuator (left and right) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Soft-mute and mixing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Others . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4/35
TDA7404
List of figures
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Input stages diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Signal-flow of mixing-stage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Loudness attenuation @ fC = 400 Hz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Loudness center frequencies @ Attn. = 15 dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Loudness attenuation, fC = 2.4 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Soft-mute timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Soft-step timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 10. Bass control @ f = 80 Hz, Q = 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
C
Figure 11. Bass center frequencies @ gain = 15 dB, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 12. Bass quality factors @ gain = 14 dB, f = 80 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
C
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
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)
?
?
Volume
–
1 dB attenuator
–
100 dB range
–
soft-step control with programmable times
Bass
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
?
?
Treble
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
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
6/35
TDA7404
Block and pin description diagrams
2
Block and pin description diagrams
Figure 1.
Block diagram
MIX
Mono Fader
Mono Fader
Mono Fader
Mono Fader
Out LF
Out RF
Out LR
Out RR
DiffinL
Diffgnd
DiffinR
SE1L
SE1R
Mono Fader
Mono Fader
SW L
SW R
SE2L
SE2R
SE3L
SE3R
Zero Cross
Mono/Beep
Beep
Mono+
Mono -
SCL
SDA
Digital Control I2C-Bus
Supply
Gnd Vref Vcc
Figure 2.
Pin connection (top view)
ACOUTL
28
27
26
25
1
2
SE1L
SE1R
SE2L
ACOUTR
VDD
3
SDA
SE2R
SE3L
4
5
24
23
22
21
20
19
18
17
16
15
SCL
SE3R
Mono+
Mono-
DiffinR
Difffgnd
DiffinL
ACINR
ACINL
CREF
6
MUTE
MUX
7
8
OUTLF
OUTLR
OUTRR
OUTRF
SWL
9
10
11
12
13
14
SWR
GND
7/35
Electrical specifications
TDA7404
3
Electrical specifications
3.1
Supply
Table 2.
Symbol
Supply
Parameter
Test condition
Min.
Typ.
Max.
Unit
Vs
Is
Supply voltage
Supply current
7.5
9
10.5
V
Vs = 9V
20
60
mA
dB
SVRR Ripple rejection @ 1 kHz
Audioprocessor (all Filters flat)
3.2
Thermal data
Table 3.
Symbol
RTh j-pins
Thermal data
Parameter
Value
Unit
Thermal resistance junction pins
max
85
°C/W
3.3
3.4
Absolute maximum ratings
Table 4.
Symbol
Absolute maximum ratings
Parameter
Value
Unit
Vs
Operating supply voltage
Operating temperature range
Storage temperature range
10.8
V
Tamb
Tstg
-40 to 85
°C
°C
-55 to +150
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 =25 °C; R =10 k; all gains = 0 dB; f = 1 kHz; unless otherwise specified)
S
amb
L
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
Input selector
Rin
VCL
SIN
Input resistance
Clipping level
all single ended Inputs
70
2.20
80
100
2.60
100
0
130
k
VRMS
dB
Input separation
GIN MIN Min. input gain
GIN MAX Max. input gain
GSTEP Step Resolution
-1
1
22
1.5
5
dB
18
20
1
dB
0.5
-5
dB
Adjacent gain steps
1
mV
mV
mV
VDC
DC Steps
G
MIN to GMAX
-10
5
10
Voffset Remaining offset with AutoZero
0.5
P differential stereo inputs
Input resistance
Rin
Differential
70
100
130
k
(see Figure 3)
-0.75
-5
0
0.75
-7
dB
dB
dB
dB
dB
only at true differential
input
GCD
Gain
-6
-11
40
-12
70
60
-13
V
CM = 1 VRMS @ 1 kHz
CM = 1 VRMS @ 10 kHz
CMRR Common mode rejection ratio
V
40
20 Hz - 20 kHz, flat;
all stages 0 dB
eNO
Output noise @ speaker-outputs
9
V
Differential mono input
Rin Input resistance
Differential
39
40
40
56
70
60
73
k
dB
dB
VCM = 1 VRMS @ 1 kHz
CMRR Common mode rejection ratio
VCM = 1 VRMS @ 10 kHz
Beep control
VRMS Beep level
250
740
1.48
1.7
350
781
1.56
1.8
500
820
1.64
1.9
mV
Hz
fB1
fB2
fB3
fB
Beep frequency
kHz
kHz
9/35
Electrical specifications
TDA7404
Unit
Table 5.
Electrical characteristics (continued)
(V =9 V; T =25 °C; R =10 k; all gains = 0 dB; f = 1 kHz; unless otherwise specified)
S
amb
L
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Mixing control
Main / mix-source
0/00
dB
dB
dB
dB
-8.5/-
10.6
-3.5/-
9.6
-2.5/-
8.6
Main / mix-source
Main / mix-source
Main / mix-source
MLEVEL Mixing level
-5/-5
-6/-6
-7/-7
-11/-
1.5
-12/-
2.5
-13/-
3.5
Volume control
GMAX Max. gain
28
-83
0.5
-1
30
-79
1
32
-75
1.5
1
dB
dB
dB
dB
dB
dB
mV
mV
AMAX Max. attenuation
ASTEP Step resolution
G = -20 to +20 dB
G = -80 to -20 dB
0
EA
ET
Attenuation set error
Tracking error
DC steps
-4
0
3
2
Adjacent steps
0.1
0.5
3
VDC
From 0 dB to GMIN
5
Loudness control
ASTEP Step resolution
AMAX Max. attenuation
-0.5
13
1
1.5
17
dB
dB
15
360
720
2.3
400
800
2.4(1)
440
880
2.5
Hz
fC
Center frequency
Hz
kHz
Soft-mute
AMUTE Mute attenuation
80
100
0.48
0.96
30.7
123
dB
ms
ms
ms
ms
V
T1
T2
T3
T4
1
2
TD
Delay time
20
70
50
170
1
VTH low Low threshold for SM pin(2)
VTH high High threshold for SM pin
2.50
70
V
RPU
VPU
Internal pull-up resistor
Pull-up voltage
100
5
130
k
V
10/35
TDA7404
Table 5.
Electrical specifications
Electrical characteristics (continued)
(V =9 V; T =25 °C; R =10 k; all gains = 0 dB; f = 1 kHz; unless otherwise specified)
S
amb
L
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
Soft-step
TSW1
TSW2
TSW3
TSW4
0.68
1.26
2.52
5.04
ms
ms
ms
ms
TSW
Switch time
Bass control
CRANGE Control range
ASTEP Step resolution
+14
0.5
54
+15
1
+16
1.5
66
dB
dB
Hz
Hz
Hz
Hz
fC1
60
80
100
200
1
fC2
72
88
fC
Center frequency
fC3
90
110
220
1.1
1.4
1.7
2.2
1
fC4
180
0.9
1.1
1.3
1.8
-1
Q1
Q2
1.25
1.5
2
QBASS Quality factor
Q3
Q4
DC = off
DC = on
0
dB
dB
DCGAIN Bass DC gain
4
4.4
6
Treble control
CRANGE Control range
ASTEP Step resolution
+14
0.5
8
+15
1
+16
1.5
12
dB
dB
fC1
fC2
fC3
fC4
10
kHz
kHz
kHz
kHz
10
12
14
12.5
15
15
fC
Center frequency
18
17.5
21
Speaker attenuator
CRANGE Control range
-53
0.5
80
-2
50
1
-47
1.5
dB
dB
ASTEP Step resolution
Only for attenuation up to 24 dB
AMUTE Output mute attenuation
90
dB
EE
VDC
TZC
Vth
Attenuation set error
DC steps
2
5
dB
Adjacent attenuation steps
Data bit D1=1, D2=1
0.10
37
mV
ms
mV
Zero cross timer
Zero cross threshold
29
45
+20
11/35
Electrical specifications
TDA7404
Unit
Table 5.
Electrical characteristics (continued)
(V =9 V; T =25 °C; R =10 k; all gains = 0 dB; f = 1 kHz; unless otherwise specified)
S
amb
L
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Fader outputs
VCLIP Clipping level
d = 0.3%
2.20
2
2.60
VRMS
k
nF
RL
CL
Output load resistance
Output load capacitance
10
100
4.7
ROUT Output impedance
VDC DC Voltage Level
30
W
4.3
4.5
V
Subwoofer attenuator
CRANGE Control range
-53
0.5
80
50
1
-47
1.5
dB
dB
dB
dB
mV
ASTEP Step resolution
AMUTE Output mute attenuation
90
EE
Attenuation set error
DC steps
2
5
VDC
Adjacent attenuation steps
0.10
10
General
BW = 20 Hz - 20 kHz
all gains = 0 dB single ended
inputs
eNO
Output noise
15
V
all gains = 0 dB
flat; VO = 2VRMS
106
100
dB
dB
%
S/N
Signal to noise ratio
bass, treble at +12 dB;
a-weighted; VO = 2.6 VRMS
V
IN = 1 VRMS; all stages 0 dB
internal pass only
OUT = 1 VRMS
0.005
0.05
0.1
0.1
d
Distortion
V
;
%
Bass and treble = 12 dB
SC
ET
Channel separation left/right
Total tracking error
80
-1
-2
100
0
dB
dB
dB
AV = 0 to -20 dB
1
2
AV = -20 to -60 dB
0
1. The SM-Pin is active low (Mute = 0).
2. Center frequency 2.4 kHz makes 1kHz bottom frequency at low and high frequency boost condition.
12/35
TDA7404
Description of functionality
4
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
Diffin+
/(SE4)
Diffgnd
28k
28k
28k
28k
Mono+
Mono -
SE1
Ingain
SE2
SE3
1. It is possible that the Differential input is switched a single ended input (SE4) like SE1.. 3.
13/35
Description of functionality
TDA7404
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
Input Selector
In-Gain
Mixing
Mixing Level
Input / Beep or Mono
Diffin
SE1
Loudness
0dB
-3.5dB
/
/
-100dB
- 9.6dB
SE2
-
6dB
/
-
6dB
- 12dB
/
- 2.5dB
SE3
Mono
Beep
14/35
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 f = 400 Hz.
C
Figure 5.
Loudness attenuation @ f = 400 Hz
C
5
0
-5
-10
-15
-20
10K
10
1K
100
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
5
0
-5
-10
-15
-20
10K
10
1K
100
15/35
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, f = 2.4 kHz
C
5
0
-5
-10
-15
-20
10K
10
1K
100
4.5
Soft-mute
2
The digitally controlled soft-mute stage allows muting/demuting the signal with a I C bus
programmable slope. The mute process can either be activated by the Mute pin or by the
2
I C bus. This slope is realized in a special S-shaped curve to mute slow in the critical
regions (seeFigure 6).
2
For timing purposes the Bit 0 of the I C bus output register is set to 1 from the start of muting
until the end of de-muting.
Figure 8.
Soft-mute timing
1. Please notice that a started Mute-action is always terminated and could not be interrupted by a change of
the mute -signal.
16/35
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
Vout
2dB
1dB
Time
SS Time
-1dB
-2dB
1. 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 @ f = 80 Hz, Q = 1
C
15.0
10.0
5.0
dB
0.0
-5.0
-10.0
-15.0
10.0
100.0
1.0K
10.0K
Hz
17/35
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
16
12
8
4
0
-4
10K
10
1K
100
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, f = 80 Hz
C
15.0
12.5
10.0
7.5
5.0
2.5
0.0
10.0
100.0
1.0K
10.0K
18/35
TDA7404
Description of functionality
4.7.4
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 13. Bass normal and DC mode @ gain = 14 dB, f = 80 Hz
C
15.0
12.5
10.0
7.5
5.0
2.5
0.0
10.0
100.0
1.0K
10.0K
1. The center frequency, Q and DC mode can be set fully independently.
19/35
Description of functionality
TDA7404
4.8
Treble
There are two parameters programmable in the treble stage:
4.8.1
Attenuation
Figure 14 shows the attenuation as a function of frequency at a center frequency of
17.5 kHz.
Figure 14. Treble control @ f = 17.5kHz
C
20
15
10
5
0
-5
-10
-15
-20
10K
10
1K
100
4.8.2
Center frequency
Figure 15 shows the four possible center frequencies 10 k, 12.5 k, 15 k and 17.5 kHz.
Figure 15. Treble center frequencies @ Gain = 15 dB
20
15
10
5
0
-5
10K
10
1K
100
20/35
TDA7404
Description of functionality
4.9
External AC - coupling
TDA7404 has external AC coupling terminals which can be selected one of two positions
behind the mixing stage or bass filter.
Figure 16. External AC coupling
SOUND
EFFECTS
ACOUT
ACIN
SW2
a
SW1
a
ACC selector
Speaker
b
b
Mixing
Stage
Volume & Filter
Input
SW4
SW3
The external AC coupling is selected in position of four switches controlled by the lower 2bit
in the Others selection (seeTable 6).
Table 6.
D1
Others selection
D0
Switch position
X
0
1
0
1
1
SW3 = ON, SW4 = ON (selected internal pass), SW1 = b, SW2 = open
SW3 = OFF, SW4 = ON, SW1 = a, SW2 = a
SW3 = ON, SW4 = OFF, SW1 = b, SW2 = b
4.10
4.11
Speaker attenuator
Due to practical aspects the steps in the speaker-attenuator are not linear over the full
range. At attenuations more than 24 dB the steps increase from 1.5 dB to 10 dB (please see
data byte specification).
Subwoofer attenuator
The Subwoofer output is a single ended stereo output. The attenuator is exactly the same
like the other speakers.
21/35
I2C bus interface
TDA7404
2
5
I C bus interface
5.1
Interface protocol
The interface protocol comprises:
?
?
?
?
?
?
a start condition (S)
a chip address byte (the LSB bit determines read / write transmission)
a subaddress byte
a sequence of data (N-bytes + acknowledge)
a stop condition (P)
the max. clock speed is 500 Kbits/s
Figure 17. Software specification
CHIP ADDRESS
SUBADDRESS
DATA 1 to DATA n
ACK
MSB
1
LSB
R/W
MSB
LSB
MSB
LSB
S
0
0
0
1
0
0
ACK
I
I
I
I
A
A
A
A
0
ACK
ACK
P
3
2
1
0
3
2
1
D99AU1044
S
= Start
R/W
= "0" -> Receive-Mode (Chip could be programmed by P)
"1" -> Transmission-Mode (Data could be received by P)
ACK
P
= Acknowledge
= Stop
5.2
Transmitted data (send mode)
MSB
LSB
X
X
X
X
X
X
X
SM
SM = Soft mute activated
X = Not Used
The transmitted data is automatic updated after each ACK. Transmission can be repeated
without new chipaddress.
5.3
Reset condition
A Power on reset is invoked if the supply voltage is below than 3.5V. After that the following
data is written automatically into the registers of all subaddresses:
MSB
LSB
1
1
1
1
1
1
1
0
The programming after POR is marked bold-face / underlined in the programming tables.
22/35
TDA7404
I2C bus interface
With this programming all the outputs are muted to V
(V
= V /2).
OUT DD
REF
Note:
All the blank bits in the following tables are "don't care"-bits.
5.4
Subaddress (receive mode)
Table 7.
MSB
Subaddress (receive mode)
LSB
A0
Function
I3
I2
I1
I0
A3
A2
A1
Zero cross / Soft Mute (1)
Zero Cross available
Soft Mute available
0
1
AutoZero Remain (2)
0
1
off
on
Testmode (3)
0
1
off
on
Auto-Increment Mode (4)
0
1
off
on
Input Selector / Gain
Loudness
Volume
0
0
0
0
0
0
0
0
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Treble
Bass
Speaker attenuator LF / Bass Fc
select
Speaker attenuator RF
Speaker attenuator LR
Speaker attenuator RR
Subwoofer attenuator LSW
Subwoofer attenuator RSW
Soft-mute / Mixing
Others selection
Testing
1. For more information seeSection 4.5: Soft-mute.
2. For more information see Section 4.2: AutoZero
3. For more information see Test Programming block
4. If this bit is set to "1", the subaddress is automatically increased after the transmission of a data-byte.
Therefore a transmission of more than one byte without sending the new subaddress is possible.
23/35
I2C bus interface
TDA7404
5.5
Data byte specification
Table 8.
MSB
Input selector / gain
LSB
D0
Function
D7
D6
D5
D4
D3
D2
D1
Source selector
Mono Differential
Single Ended 1
Mute
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Single Ended 2
Pseudo Differential / Single Ended
4
Single Ended 3
Mute
Beep
Input gain
0 dB
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
X
X
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
X
X
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
X
X
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1 dB
2 dB
3 dB
4 dB
5 dB
6 dB
7 dB
8 dB
9 dB
10 dB
11 dB
12 dB
13 dB
14 dB
16 dB
18 dB
20 dB
24/35
TDA7404
I2C bus interface
Table 9.
MSB
Loudness
D5
LSB
D0
Function
D7
D6
D4
D3
D2
D1
Attenuation
0 dB
0
0
:
0
0
:
0
0
:
0
1
:
-1 dB
:
1
1
1
1
1
1
0
1
-14 dB
-15 dB
Filter / Center Frequency
off (flat) 'D6 must be = 0'
400 Hz
0
0
1
1
0
1
0
1
0
800 Hz
2.4 kHz
Shape
0
1
Low boost
Low and high boost
Soft-step-Volume
0
1
off
on
Note 1: The attenuation is specified at high frequencies. Around the center frequency the value is different
depending on the programmed attenuation (see Section 4.4: Loudness).
Table 10. Volume
MSB
D7
LSB
D0
Function
Gain/attenuation
D6
D5
D4
D3
D2
D1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
1
0
1
not allow
not allow
+30.0 dB
+29.0 dB
:
0
0
0
0
0
1
1
1
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
1
1
0
1
0
1
0
1
X
+1.0 dB
0.0 dB
- 1.0 dB
- 2.0 dB
:
1
1
1
1
1
1
0
0
1
1
1
X
1
1
X
1
1
X
-78.0 dB
-79.0 dB
Mute
Diffin - mode
0
1
Single ended stereo
Differential Stereo
Note 2: It is not recommended to use a gain more than 20 dB for system performance reason. In general, the
max. gain should be limited by software to the maximum value, which is needed for the system.
25/35
I2C bus interface
TDA7404
Table 11.
Treble programming
MSB
D7
LSB
D0
Function
D6
D5
D4
D3
D2
D1
Treble Steps
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
15 dB
14 dB
13 dB
12 dB
11 dB
10 dB
9 dB
8 dB
7 dB
6 dB
5 dB
4 dB
3 dB
2 dB
1 dB
0 dB
Mode
Cut
0
1
Boost
Treble Center Frequency
10 kHz
X
X
X
X
0
0
1
1
0
1
0
1
12.5 kHz
15 kHz
17.5 kHz
26/35
TDA7404
I2C bus interface
Table 12. Bass programming
MSB
LSB
D0
Function
D7
D6
D5
D4
D3
D2
D1
Bass steps
15 dB
14 dB
13 dB
12 dB
11 dB
10 dB
9 dB
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
8 dB
7 dB
6 dB
5 dB
4 dB
3 dB
2 dB
1 dB
0 dB
Mode
Cut
0
1
Boost
Quality Factor
0
0
1
1
0
1
0
1
1
1.25
1.5
2
DC - Mode
0
1
Off
On
Note 3: For more information please refer to Section 4.7: Bass.
27/35
I2C bus interface
TDA7404
Table 13. Speaker attenuator left front
MSB
D7
LSB
D0
Function
D6
D5
D4
D3
D2
D1
Attenuation
0 dB
0
0
:
0
0
:
0
0
:
0
0
:
0
0
:
0
1
:
-1 dB
:
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
X
0
1
1
1
1
1
1
1
1
X
1
0
0
0
0
1
1
1
1
X
1
0
0
1
1
0
0
1
1
X
1
0
1
0
1
0
1
0
1
X
-23 dB
-24.5 dB
-26 dB
-28 dB
-30 dB
-32 dB
-35 dB
-40 dB
-50 dB
Speaker Mute
Bass Center-Frequency
0
0
1
1
0
1
0
1
60 Hz
80 Hz
100 Hz
200 Hz
Table 14. Speaker attenuator right front
MSB
LSB
D0
Function
D7
D6
D5
D4
D3
D2
D1
Attenuation
0 dB
0
0
:
0
0
:
0
0
:
0
0
:
0
0
:
0
1
:
-1 dB
:
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
X
0
1
1
1
1
1
1
1
1
X
1
0
0
0
0
1
1
1
1
X
1
0
0
1
1
0
0
1
1
X
1
0
1
0
1
0
1
0
1
X
-23 dB
-24.5 dB
-26 dB
-28 dB
-30 dB
-32 dB
-35 dB
-40 dB
-50 dB
Speaker Mute
X
X
28/35
TDA7404
I2C bus interface
Table 15. Speaker attenuator left rear
MSB
LSB
D0
Function
D7
D6
D5
D4
D3
D2
D1
Attenuation
0 dB
0
0
:
0
0
:
0
0
:
0
0
:
0
0
:
0
1
:
-1 dB
:
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
X
0
1
1
1
1
1
1
1
1
X
1
0
0
0
0
1
1
1
1
X
1
0
0
1
1
0
0
1
1
X
1
0
1
0
1
0
1
0
1
X
-23 dB
-24.5 dB
-26 dB
-28 dB
-30 dB
-32 dB
-35 dB
-40 dB
-50 dB
X
X
Speaker mute
Table 16. Speaker attenuator right rear
MSB
LSB
D0
Function
D7
D6
D5
D4
D3
D2
D1
Attenuation
0 dB
0
0
:
0
0
:
0
0
:
0
0
:
0
0
:
0
1
:
-1 dB
:
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
X
0
1
1
1
1
1
1
1
1
X
1
0
0
0
0
1
1
1
1
X
1
0
0
1
1
0
0
1
1
X
1
0
1
0
1
0
1
0
1
X
-23 dB
-24.5 dB
-26 dB
-28 dB
-30 dB
-32 dB
-35 dB
-40 dB
-50 dB
Speaker mute
X
X
29/35
I2C bus interface
TDA7404
Table 17. Subwoofer attenuator (left and right)
MSB
D7
LSB
D0
Function
D6
D5
D4
D3
D2
D1
Attenuation
0 dB
0
0
:
0
0
:
0
0
:
0
0
:
0
0
:
0
1
:
-1 dB
:
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
X
0
1
1
1
1
1
1
1
1
X
1
0
0
0
0
1
1
1
1
X
1
0
0
1
1
0
0
1
1
X
1
0
1
0
1
0
1
0
1
X
-23 dB
-24.5 dB
-26 dB
-28 dB
-30 dB
-32 dB
-35 dB
-40 dB
-50 dB
X
X
Speaker Mute
Table 18. Soft-mute and mixing
MSB
LSB
D0
Function
D7
D6
D5
D4
D3
D2
D1
Mute
0
1
enable soft-mute
disable soft-mute
Mute/Zero Cross-Times
0.48 ms
0
0
1
1
0
1
0
1
0.96 ms
30.7 ms / 9 ms
122.8 ms / 37 ms
Mixing-Source
Beep
0
1
Phone
Mixing-Level (Main / Mix-Source)
0
0
1
1
0
1
0
1
-12 / -2.5 dB
-6 / -6 dB
-3.5 / -9.6 dB
0 /
Beep Frequency
781 Hz
0
0
1
1
0
1
0
1
1.56 kHz
Not allow
1.8 kHz
30/35
TDA7404
I2C bus interface
Table 19. Others
MSB
LSB
D0
Function
D7
D6
D5
D4
D3
D2
D1
AC coupling
Internal pass
X
0
1
0
1
1
Coupling between Mixing Stage and Volume
Coupling between Bass filter and Speaker
attenuator
1
Must be "1" for make up
Must be "1" for make up
1
Soft Step Time
0.68ms
0
0
1
1
0
1
0
1
1.26ms
2.52ms
5.04ms
1
Must be "1" for AutoZero
Internal Beep
0
1
Off
ON
Table 20. Testing
MSB
LSB
Function
D7
D6
D5
D4
D3
D2
D1
D0
Main-Testmode
X
X
X
X
X
X
0
1
off
on
Test-Multiplexer
X
X
X
X
X
X
0
1
internal 200kHz Clock
internal Bandgap Voltage
Clock
X
X
X
X
X
X
0
1
external
internal
1
1
must be "1"
31/35
Application circuit
TDA7404
6
Application circuit
Figure 18. TDA7404 application circuit
SOUND
EFFECTS
OutLF
OutLR
OutRR
OutRF
SE1L
SE1R
OutLF
OutLR
OutRR
OutRF
TapeL
TapeR
4.7u
4.7u
4.7u
4.7u
100n
100n
SE2L
SE2R
FM_L
FM_R
100n
100n
SWL
SWR
SWL
SWR
SE3L
AM_L
AM_R
TDA7404
4.7u
4.7u
100n
100n
100n
100n
SE3R
MONO+
MONO -
Phone
Spectrum
Analyzer
MUX
PhoneGnd
DiffinL
CD_L
100n
100n
100n
VDD
GND
DiffinGnd
DiffinR
CDGnd
CD_R
100n
10u
+
10u
9V
32/35
TDA7404
Package information
7
Package information
In order to meet environmental requirements, ST offers these devices in different grades of
®
®
ECOPACK packages, depending on their level of environmental compliance. ECOPACK
specifications, grade definitions and product status are available at: www.st.com.
®
ECOPACK is an ST trademark.
Figure 19. SO-28 mechanical data and package dimensions
mm
inch
DIM.
OUTLINE AND
MECHANICAL DATA
MIN. TYP. MAX. MIN. TYP. MAX.
A
a1
b
2.65
0.3
0.104
0.012
0.019
0.013
0.1
0.004
0.35
0.23
0.49 0.014
0.32 0.009
b1
C
0.5
0.020
c1
D
45° (typ.)
17.7
10
18.1 0.697
10.65 0.394
0.713
0.419
E
e
1.27
0.050
0.65
e3
F
16.51
7.4
0.4
7.6
0.291
0.299
0.050
L
1.27 0.016
SO-28
S
8 ° (max.)
33/35
Revision history
TDA7404
8
Revision history
Table 21. Document revision history
Date
Revision
Changes
15-Jul-2003
1
Initial release.
Document reformatted.
16-Dec-2008
24-Sep-2013
2
3
Added Table 1: Device summary on page 1.
Updated Section 7: Package information.
Updated Disclaimer.
34/35
TDA7404
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