Features
■ 4 stereo inputs
■ Soft-step volume
■ Bass, middle, treble and loudness
■ Direct mute and soft-mute
■ Four independent speaker outputs
■ Sub woofer output
■ Soft-step speaker/subwoofer control
■ 7 bands spectrum analyzer
■ Digital control:
2
–I
C bus interface
Description
TDA7419
3 band car audio processor
SO-28
The TDA7419 is a high performance signal
processor specifically designed for car radio
applications. The device includes a high
performance audioprocessor with fully integrated
audio filters.
Table 1. Device summary
Order code Package Packing
TDA7419 SO-28 Tube
TDA7419TR SO-28 Tape and reel
The digital control allows programming in a wide
range of filter characteristics. By the use of
BICMOS-process and linear signal processing
low distortion and low noise are obtained.
February 2009 Rev 6 1/40
www.st.com
1
Contents TDA7419
Contents
1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1 Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.3 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4 Description of the audio processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1 Audio processor features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2 Input stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.2.1 Quasi-differential stereo input (QD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.2.2 Single-ended stereo input (SE1, SE2, SE3/AC2IN) . . . . . . . . . . . . . . . . 15
4.3 AutoZero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.3.1 AutoZero remain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.4 Loudness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.4.1 Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.4.2 Peak frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.4.3 Low and high frequency boost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.4.4 Flat mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.5 Soft-mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.5.1 Soft-step volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.6 Bass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.6.1 Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.6.2 Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.6.3 Quality factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.6.4 DC mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.7 Middle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.7.1 Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.7.2 Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.7.3 Quality factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2/40
TDA7419 Contents
4.8 Treble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.8.1 Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.8.2 Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.9 Subwoofer filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.10 Spectrum analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.11 AC coupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.12 HPF applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.13 Output selector and mixing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.14 Audioprocessor testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.15 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5I
2
C bus specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.1 Interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.1.1 Receive mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.1.2 Transmission mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.1.3 Reset condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.2 Subaddress (receive mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.3 Data byte specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
3/40
List of tables TDA7419
List of tables
Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 3. Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 4. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 5. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 6. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 7. Subaddress (receive mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Table 8. Main selector (0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Table 9. Main loudness (1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Table 10. Soft-mute / clock generator (2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Table 11. Volume / speaker / mixing / subwoofer attenuation (3, 10-15) . . . . . . . . . . . . . . . . . . . . . . 32
Table 12. Treble filter (4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Table 13. Middle filter (5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Table 14. Bass filter (6). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 15. Second source selector (7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 16. Subwoofer /middle / bass (8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Table 17. Mixing / gain effect (9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Table 18. Spectrum analyzer / clock source / AC mode (16) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Table 19. Testing audio processor (17) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Table 20. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
4/40
TDA7419 List of figures
List of figures
Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 2. Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 3. Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 4. Loudness attenuation @ fP = 400 Hz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 5. Loudness center frequencies @ Attn. = 15 dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 6. Loudness attenuation, fC = 2.4 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 7. Soft-mute timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 8. Soft-step timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 9. Bass control @ fC = 80 Hz, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 10. Bass center frequencies @ gain = 15 dB, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 11. Bass quality factors @ gain = 14 dB, fC = 80 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 12. Bass normal and DC mode @ gain = 14 dB, fC = 80 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 13. Middle control @ fC = 1 kHz, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 14. Middle center frequencies @ gain = 14 dB, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 15. Middle quality factors @ gain = 14 dB, fc = 1 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 16. Treble control @ fC = 17.5 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 17. Treble center frequencies @ gain = 15 dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 18. Subwoofer control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 19. Spectrum analyzer block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 20. Timing of the spectrum analyzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 21. Diagram of AC coupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 22. HPF diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 23. Output selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 24. Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 25. SO-28 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5/40
Block diagram TDA7419
1 Block diagram
Figure 1. Block diagram
MIX/
MIX/
OUTLR2
OUTLR2
OUTSW/
OUTSW/
OUTSW/
OUTLR
OUTLF
OUTLF
Mix
Mix
HPF
HPF
OUTLR
OUTRF
OUTRF
Mix
Mix
HPF
HPF
OUTRR
OUTRR
OUTSW/
OUTRR2
OUTRR2
FILOR
FILOR
ACINR/
ACINR/
FILOL
FILOL
ACINL/
ACINL/
ACOUTR/
ACOUTR/
AC2OUTR
AC2OUTR
ACOUTL/
ACOUTL/
AC2OUTL
AC2OUTL
MUTE
MUTE
Softstep
Softstep
MonoFader
MonoFader
Softstep
Softstep
Loudness MiddleTreble BassSoftMute
Loudness MiddleTreble BassSoftMute
Softstep
Softstep
Softstep
Softstep
Softstep
MonoFader
MonoFader
MonoFader
MonoFader
Volume
Volume
Softstep
Softstep
MonoFader
MonoFader
Softstep
MonoFader
MonoFader
LPF
LPF
Subwoofer
Subwoofer
Softstep
Softstep
MonoFader
MonoFader
SE3R
SE3R
AC2INR/
AC2INR/
SE3L
SE3L
AC2INL/
AC2INL/
SDASCL
SDASCL
C BUSDIGITAL CONTROL
C BUSDIGITAL CONTROL I2C BUSDIGITAL CONTROL
2
2
I
I
Analyzer
Analyzer
Spectrum
SAOUT SACLK
SAOUT SACLK
Spectrum
InGain
InGain
InGain
AutoZero
AutoZero
SE1L
DIFFL
DIFFL
SE1L
DIFFG
DIFFG
DIFFR
DIFFR
InGain
INPUT
INPUT
MULTIPLEXER
MULTIPLEXER
SE2L
SE2L
SE1R
SE1R
6/40
VREFOUTF
VREFOUTF
SUPPLY
SUPPLY
VDD CREFGND
VDD CREFGND
SE2R
SE2R
TDA7419 Pin description
2 Pin description
Figure 2. Pin connection (top view)
ACOUTR/AC2OUTR
ACINR/FILOR
ACINL/FILOL
ACOUTL/AC2OUTL
SE3L/ACINL
SE3R/ACINR
Table 2. Pin description
Pin
N#
Pin name Function I/O
28
2
3
4
5
6
SE2L
SE2R
SE1L OUTLF
SE1R OUTLR
DIFFL
DIFFG
DIFFR OUTSW/OUTLR2
7
8
9
10
12
13
D04AU1569
27
26
25
24
23
22
21
20
19
18
17
16
1514CREF GND
MIX/OUTSW/OUTRR21
VREF
SAOUT
SAIN
VDD
SDA
SCL
MUTE
OUTRR11
OUTRF
1 ACOUTR / AC2OUTR AC coupling right output / HPF filter AC2OUT right channel O
2 ACINR / FILOR AC coupling right input / HPF filter FILO right channel I/O
3 ACINL / FILOL AC coupling left input / HPF filter FILO left channel I/O
4 ACOUTL / AC2OUTL AC coupling left output / HPF filter AC2OUT left channel O
5 SE3L / ACINL Single-ended input 3 left channel / AC coupling left input I
6 SE3R / ACINR Single-ended input 3 right channel / AC coupling right input I
7 SE2L Single-ended input 2 left channel I
8 SE2R Single-ended input 2 right channel I
9 SE1L Single-ended input 1 left channel I
10 SE1R Single-ended input 1 Right channel I
11 DIFFL Pseudo differential stereo input left I
12 DIFFG Pseudo differential stereo input common I
13 DIFFR Pseudo differential stereo input right I
14 CREF Reference capacitor O
15 GND Ground S
nd
16 OUTSW / OUTLR2 Subwoofer output / 2
rear left output O
17 OUTRF Front right output O
7/40
Pin description TDA7419
Table 2. Pin description (continued)
Pin
N#
18 OUTRR Rear right output O
19 OUTLR Rear left output O
20 OUTLF Front left output O
21 MUTE External mute pin I
22 SCL I2C bus clock I
23 SDA I2C bus data I/O
24 VDD Supply S
25 SAIN Spectrum analyzer clock input I
26 SAOUT Spectrum analyzer output O
27 VREF Vref output O
28
Pin name Function I/O
MIX / OUTSW /
OUTRR2
Mix input / Additional subwoofer output / 2
nd
rear right output I/O
8/40
TDA7419 Electrical specifications
3 Electrical specifications
3.1 Supply
Table 3. Supply
Symbol Parameter Test condition Min. Typ. Max. Unit
V
Supply voltage 8.0 8.5 10 V
s
Supply current Vs = 8.5 V 30 35 40 mA
I
s
SVRR Ripple rejection @ 1 kHz Audioprocessor (all Filters flat) 60 dB
3.2 Thermal data
Table 4. Thermal data
Symbol Parameter Value Unit
R
Th j-pins
Thermal resistance junction to pinsmax 85 °C/W
3.3 Absolute maximum ratings
Table 5. Absolute maximum ratings
Symbol Parameter Value Unit
V
Operating supply voltage 10.5 V
s
T
T
V
Operating temperature range -40 to 85 °C
amb
Storage temperature range -55 to +150 °C
stg
Human body model ≥±1750
ESD withstand voltage
ESD
Charged device model ≥±1500
VMachine model ≥±150
9/40
Electrical specifications TDA7419
3.4 Electrical characteristics
Table 6. Electrical characteristics
V
= 8.5V; T
S
= 25°C; RL = 10kΩ; all gains = 0 dB; f = 1 kHz; unless otherwise specified
amb
Symbol Parameter Test condition Min. Typ. Max. Unit
Supply
Supply voltage 8 8.5 10 V
V
S
Supply current 27 37 47 mA
I
S
Input selector
R
Input resistance All single ended inputs 70 100 130 kΩ
in
All Input 1.8 2 V
V
G
IN MIN
G
IN MAX
G
S
STEP
Clipping level
CL
Input separation 80 100 dB
IN
QD input 1.7 2 V
Min. input gain -1 0 1 dB
Max. input gain 13 15 17 dB
Step resolution 0.5 1 1.5 dB
Adjacent gain steps -5 1 5 mV
V
V
offset
DC steps
DC
to G
G
MIN
MAX
-20 4 20 mV
Remaining offset with AutoZero 0.5 mV
Differential stereo inputs
RMS
RMS
R
Input resistance Differential 70 100 130 KΩ
in
CMRR Common mode rejection ratio
e
Output noise @ speaker outputs
No
MIxing control
M
G
A
A
LEVEL
STEP
Mixing ratio Main / mix source -6/-6 dB
Max gain 13 15 17 dB
MAX
Max attenuation -83 -79 -75 dB
MAX
Step resolution 0.5 1 1.5 dB
Loudness control
A
A
f
STEP
Peak
Max attenuation -17 -15 -13 dB
MAX
Step resolution 0.5 1 1.5 dB
Peak frequency
=1 VRMS @ 1 kHz 46 70 dB
V
CM
=1 VRMS @ 10 kHz 46 60 dB
V
CM
20 Hz to 20 kHz, flat;
all stages 0 dB
f
P1
f
P2
f
P3
360 400 440 Hz
720 800 880 Hz
2200 2400 2600 Hz
12 μV
10/40
TDA7419 Electrical specifications
Table 6. Electrical characteristics (continued)
V
= 8.5V; T
S
Symbol Parameter Test condition Min. Typ. Max. Unit
Volu m e cont r o l
= 25°C; RL = 10kΩ; all gains = 0 dB; f = 1 kHz; unless otherwise specified
amb
G
A
A
STEP
E
V
Max gain 13 15 17 dB
MAX
Max attenuation -83 -79 -75 dB
MAX
Step resolution 0.5 1 1.5 dB
Attenuation set error
A
Tracking error 2dB
E
T
DC steps Adjacent attenuation steps -3 0.1 3 mV
DC
Soft-mute
A
MUTE
V
TH Low
V
TH High
R
V
Mute attenuation 80 100 dB
Delay time
T
D
Low threshold for SM pin 1 V
High threshold for SM pin 2.5 V
Internal pull-up resistor 32 45 58 kΩ
PU
Internal pull-up voltage 3.3 V
PU
Bass control
G = -20 to +20 dB -0.75 0 +0.75 dB
G = -79 to -20 dB -4 0 3 dB
From 0dB to G
MIN
-5 0.5 5 mV
T1 0.48 1 ms
T2 0.96 2 ms
T3 70 123 170 ms
Fc Center frequency
Q
BASS
C
RANGE
A
STEP
DC
Quality factor
Control range ±14 ±15 ±16 dB
Step resolution 0.5 1 1.5 dB
Bass-DC-gain
GAIN
f
C1
f
C2
f
C3
f
C4
Q
1
Q
2
Q
3
Q
4
54 60 66 Hz
72 80 88 Hz
90 100 110 Hz
180 200 220 Hz
0.911.1
1.11.251.4
1.3 1.5 1.7
1.822.2
DC = off -1 0 +1 dB
DC = on (shelving filter, use for
cut only)
-4.4 dB
11/40
Electrical specifications TDA7419
Table 6. Electrical characteristics (continued)
V
= 8.5V; T
S
Symbol Parameter Test condition Min. Typ. Max. Unit
Middle control
= 25°C; RL = 10kΩ; all gains = 0 dB; f = 1 kHz; unless otherwise specified
amb
C
RANGE
A
STEP
Q
BASS
Control range ±14 ±15 ±16 dB
Step resolution 0.5 1 1.5 dB
f
Center frequency
c
Quality factor
Treble control
C
RANGE
A
STEP
Clipping level ±14 ±15 ±16 dB
Step resolution 0.5 1 1.5 dB
fc Center frequency
Speaker attenuators
f
C1
f
C2
f
C3
f
C4
Q
1
Q
2
Q
3
Q
4
f
C1
f
C2
f
C3
f
C4
400 500 600 Hz
0.811.2kHz
1.2 1.5 1.8 kHz
22.53kHz
0.45 0.5 0.55
0.65 0.75 0.85
0.911.1
1.11.251.4
81012kHz
10 12.5 15 kHz
12 15 18 kHz
14 17.5 21 kHz
G
A
A
A
MUTE
V
STEP
E
Max gain 14 15 16 dB
MAX
Max attenuation -83 -79 -75 dB
MAX
Step resolution 0.5 1 1.5 dB
Mute attenuation 80 90 dB
Attenuation set error 2 dB
E
DC steps Adjacent attenuation steps -5 0.1 5 mV
DC
AUdio outputs
V
R
V
Clipping level
CL
Output impedance 30 100 W
OUT
Output load resistance 2 kΩ
R
L
Output load capacitor 10 nF
C
L
DC voltage level 3.8 4.0 4.2 V
DC
d = 0.3%
Subwoofer attenuator
G
A
Max gain 14 15 16 dB
MAX
Max attenuation -83 -79 -75 dB
MAX
12/40
1.8 2 V
RMS
TDA7419 Electrical specifications
Table 6. Electrical characteristics (continued)
V
= 8.5V; T
S
Symbol Parameter Test condition Min. Typ. Max. Unit
= 25°C; RL = 10kΩ; all gains = 0 dB; f = 1 kHz; unless otherwise specified
amb
A
A
MUTE
V
STEP
E
Step resolution 0.5 1 1.5 dB
Mute attenuation 80 90 dB
Attenuation set error 2 dB
E
DC steps Adjacent attenuation steps -5 1 5 mV
DC
Subwoofer lowpass
f
Lowpass corner frequency
LP
HPF effect
G
G
A
STEP
Max gain 21 22 23 dB
MAX
Min gain 3 4 5 dB
MIN
Step resolution 1.5 2 2.5 dB
Spectrum analyzer control
V
SAOut
f
f
f
f
f
f
f
Output voltage range 0 3.3 V
Center frequency band 1 5.5 62 69 Hz
C1
Center frequency band 2 141 157 173 Hz
C2
Center frequency band 3 356 392 436 Hz
C3
Center frequency band 4 0.9 1 1.1 kHz
C4
Center frequency band 5 2.26 2.51 2.76 kHz
C5
Center frequency band 6 5.70 6.34 6.98 kHz
C6
Center frequency band 7 14.4 16 17.6 kHz
C7
Q Quality factor
f
SAClk
t
Sadel
t
repeat
t
intres
Clock frequency 3 100 kHz
Analog output delay time 2 μs
Spectrum analyzer repeat time 50 ms
Internal reset time 4.5 ms
General
f
f
f
LP1
LP2
LP3
72 80 88 Hz
108 120 132 Hz
144 160 176 Hz
Q1 1.62 1.8 1.98
Q2 3.15 3.5 3.85
BW = 20 Hz to 20 kHz
all gain = 0dB
e
NO
Output noise
BW = 20 Hz to 20 kHz output
muted
S/N Signal to noise ratio all gain = 0 dB flat; V
D Distortion V
S
Channel separation left/right 80 90 dB
C
IN
= 1 V
; all stages 0 dB 0.01 0.1 %
RMS
13/40
= 2 V
o
RMS
12 20 μV
615μV
100 dB
Description of the audio processor TDA7419
4 Description of the audio processor
4.1 Audio processor features
● Input Multiplexer
– QD / SE: quasi-differential stereo inputs, with selectable single-ended mode
– SE1: stereo single-ended input
– SE2: stereo single-ended input
– SE3 / AC2IN: stereo single-ended input / HPF filter input
– In-Gain 0 to 15dB, 1dB steps
– internal offset-cancellation (AutoZero)
– separate second source-selector
● Mixing stage
– mixable to front speaker-outputs
● Loudness
nd
–2
– programmable center frequency (400Hz/800Hz/2400Hz)
– 15 dB with 1 dB steps
– selectable low and high frequency boost
– selectable flat-mode (constant attenuation)
● Vol u me
– +15 dB to -79 dB with 1 dB step resolution
– soft-step control with programmable blend times
● Bass
–2
– 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 to 15 dB range with 1 dB resolution
● Middle
–2
– center frequency programmable in 4 steps (500Hz/1KHz/1.5KHz/2.5KHz)
– Q programmable 0.5/0.75/1.0/1.25
– DC gain programmable
– -15 to 15dB range with 1dB resolution
● Tre bl e
–2
– center frequency programmable in 4 steps (10KHz/12.5KHz/15KHz/17.5KHz)
– -15 to 15dB range with 1dB resolution
● Spectrum analyzer
– seven bandpass filters
–2
order frequency response
nd
order frequency response
nd
order frequency response
nd
order frequency response
nd
order frequency response
14/40
TDA7419 Description of the audio processor
– programmable Q factor for different visual appearance
– analog output
– controlled by external serial clock
● Speaker
– 4 independent soft-step speaker controls, +15dB to -79dB with 1dB steps
– Independent programmable mix input with 50% mixing ratio for front speakers
–direct mute
● Subwoofer
– 2nd order low pass filter with programmable cut off frequency
– single-ended mono output independent soft-step level control, +15dB to -79dB
with 1dB steps
● Mute functions
–direct mute
– digitally controlled Soft-mute with 3 programmable mute-
times(0.48ms/0.96ms/123ms)
● Effect
– gain effect, or high pass effect with fixed external components
4.2 Input stages
In the basic configuration, one stereo quasi-differential and three (two in case of HPS
applications) single ended stereo inputs are available.
4.2.1 Quasi-differential stereo input (QD)
The QD input is implemented as a buffered quasi-differential stereo stage with 100 kΩ inputimpedance at each input. The attenuation is fixed to -3 dB in order to adapt the incoming
signal level.
4.2.2 Single-ended stereo input (SE1, SE2, SE3/AC2IN)
The input impedance at each input is 100 kΩ and the attenuation is fixed to -3dB for
incoming signals. The input for SE3 is also configurable as part of the interface for external
filters in HPS applications (AC2IN)
15/40
Description of the audio processor TDA7419
Figure 3. Input stage
QD_L
QD_G
QD_R
QD
QD
Main
Source
AC2IN_L/SE3L
AC2IN_R/SE3R
4.3 AutoZero
The AutoZero allows a reduction of the number of pins as well as external components by
canceling any offset generated by or before the In-Gain-stage (Please notice that externally
generated offsets, e.g. generated through the leakage current of the coupling capacitors,
are not canceled).
SE1_L
SE1_R
SE2_L
SE2_R
SE1
SE2
SE3
SE4
SE1
SE2
SE3
Second
Source
In Gain
Output Stage
The auto-zeroing is started every time the input source is changed and needs max. 0.3ms
for the alignment. To avoid audible clicks the Audio processor is muted before the loudness
stage during this time. The AutoZero feature is only present in the main signal-path.
4.3.1 AutoZero remain
In some cases, for example if the µP is executing a refresh cycle of the I2C 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, it can
be switched in the AutoZero remain mode (bit 6 of the subaddress byte). If this bit is set to
high, the AutoZero will not be invoked and the old adjustment-value remains.
4.4 Loudness
There are four parameters programmable in the loudness stage:
4.4.1 Attenuation
Figure 4 shows the attenuation as a function of frequency at fP = 400 Hz
16/40
TDA7419 Description of the audio processor
Figure 4. Loudness attenuation @ fP = 400 Hz.
5
0
-5
-10
-15
-20
10
4.4.2 Peak frequency
Figure 5 shows the three possible peak frequencies 400 Hz, 800 Hz and 2.4 kHz.
Figure 5. Loudness center frequencies @ Attn. = 15 dB
5
0
-5
-10
-15
100
1K
10K
-20
10
100
1K
10K
17/40
Description of the audio processor TDA7419
4.4.3 Low and high frequency boost
Figure 6 shows the different loudness shapes in low and high frequency boost.
Figure 6. Loudness attenuation, f
5
0
-5
-10
-15
-20
10
4.4.4 Flat mode
100
= 2.4 kHz
C
1K
10K
In flat mode the loudness stage works as a 0 dB to -15 dB attenuator.
4.5 Soft-mute
The digitally controlled soft-mute stage allows muting/demuting the signal with a I2C bus
programmable slope. The mute process can either be activated by the soft-mute pin or by
2
the I
C bus. This slope is realized in a special S-shaped curve to mute slow in the critical
regions (see Figure 7).
For timing purposes the bit 0 of the I
until the end of demuting.
2
C bus output register is set to 1 from the start of muting
18/40
TDA7419 Description of the audio processor
Figure 7. Soft-mute timing
1
EXT.
MUTE
+SIGNAL
REF
-SIGNAL
1
2
I
C BUS
OUT
D97AU634
Time
1. Please notice that a started mute-action is always terminated and could not be interrupted by a change of
the mute -signal
4.5.1 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. The blend-time from one step to the next is
programmable in four steps.
Figure 8. Soft-step timing
V
OUT
1dB
0.5dB
SS Time
-0.5dB
-1dB
D00AU1170
1. For steps more than 0.5dB the Soft-step mode should be deactivated because it could generate a hard
1dB step during the blend-time.
Time
4.6 Bass
There are four parameters programmable in the bass stage:
19/40
Description of the audio processor TDA7419
4.6.1 Attenuation
Figure 9 shows the attenuation as a function of frequency at a center frequency of 80 Hz.
Figure 9. Bass control @ f
15.0
10.0
5.0
dB
0.0
-5.0
-10.0
-15.0
10.0 100.0 1.0K 10.0K
= 80 Hz, Q = 1
C
Hz
20/40
TDA7419 Description of the audio processor
4.6.2 Center frequency
Figure 10 shows the four possible center frequencies 60, 80, 100 and 200 Hz.
Figure 10. Bass center frequencies @ gain = 15 dB, Q = 1
16
12
8
4
0
-4
10
4.6.3 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, f
15.0
12.5
10.0
7.5
5.0
2.5
100
1K
= 80 Hz
C
10K
0.0
10.0 100.0 1.0K 10.0K
21/40
Description of the audio processor TDA7419
4.6.4 DC mode
It is used for cut only for shelving filter. 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, f
1. The center frequency, Q and DC-mode can be set fully independently.
4.7 Middle
There are three parameters programmable in the middle stage:
= 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
4.7.1 Attenuation
Figure 13 shows the attenuation as a function of frequency at a center frequency of 1 kHz.
Figure 13. Middle control @ f
22/40
= 1 kHz, Q = 1
C
TDA7419 Description of the audio processor
4.7.2 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 = 14 dB, Q = 1
4.7.3 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
23/40
Description of the audio processor TDA7419
4.8 Treble
There are two parameters programmable in the treble stage:
4.8.1 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
20
15
10
5
0
-5
-10
-15
-20
10
4.8.2 Center frequency
Figure 17 shows the four possible center frequencies 10k, 12.5k, 15k and 17.5 kHz.
Figure 17. Treble center frequencies @ gain = 15 dB
20
15
10
5
0
100
1K
10K
-5
10
100
24/40
1K
10K
TDA7419 Description of the audio processor
4.9 Subwoofer filter
The subwoofer lowpass filter has butterworth characteristics with programmable cut-off
frequency (80/120/160 Hz)
Figure 18. Subwoofer control
4.10 Spectrum analyzer
A fully integrated seven-band spectrum analyzer with programmable quality factor is
present. The spectrum analyzer consists of seven band pass filters with rectifier and sample
capacitor that stores the maximum peak signal level since the last read cycle. This peak
signal level can be read by a microprocessor at the SAout pin. To allow easy interfacing to
an analog port of the microprocessor, the output voltage at this pin is referred to device
ground.
The microprocessor starts a read cycle with the negative going clock edge at the SAclk
input. On the following positive clock edges, the peak signal level for the band pass filters is
subsequently switched to SAout. Each analog output data is valid after the time t
reset of the sample capacitors is induced whenever SAclk remains high for the time t
Note that a proper reset requires the clock signal SAclk to be held at high potential. Figure
20 shows the block diagram and figure 21 illustrates the read cycle timing of the spectrum
analyzer.
Figure 19. Spectrum analyzer block diagram
Sadel
. A
intres
.
25/40
Description of the audio processor TDA7419
Figure 20. Timing of the spectrum analyzer
4.11 AC coupling
In some applications additional signal manipulations are desired, such as additional band
equalizations. For this purpose, an AC coupling can be placed before the loudness
attenuator or speaker-attenuators, which can be activated or internally shorted by I
In short condition, the input-signal of the speaker-attenuator is available at the AC outputs.
The input-impedance of this AC inputs is 50 kΩ.
2
C bus.
Figure 21. Diagram of AC coupling
ACOUTRACOUTL
From Input MUX
InGain
Filters
ACINL
ACINR
Speakers
To Output
26/40
TDA7419 Description of the audio processor
4.12 HPF applications
For HPF applications, HPF filter is available for additional processing after the speaker
control. It is a 2
nd
order butterworth highpass filter with selectable flat mode. Figure 22
shows the diagram of the HPF that includes an external RC network.
Figure 22. HPF diagram
External RC network
ACOUT
/AC2OUT
From speaker
SE3IN
/AC2IN
4.13 Output selector and mixing
ACIN
/FILO
Gain Control
To
output
The output-selector allows the front and rear speakers to connect to different sources. The
setup of the output selector is shown in Figure 24. A Mixing-stage is placed after the front
speaker-attenuator and can be set to mixing-mode. Having a full volume-attenuator for the
mix-signal, the stage offers a wide flexibility to adapt the mixing levels.
Figure 23. Output selector
Mix_in
Main
Second
BassL+BassR
Attenuator
Attenuator
Attenuator
Subwoofer
filter
Attenuator
Front
Rear
Subwoofer
output
27/40
Description of the audio processor TDA7419
4.14 Audioprocessor testing
In the test mode, which can be activated by setting bit D7 of the IIC subaddress byte and bit
D0 of the testing audioprocessor byte, several internal signals are available at the SE1R pin.
In this mode, the input resistance of 100kOhm is disconnected from the pin. Internal signals
available for testing are listed in the data-byte specification.
4.15 Test circuit
Figure 24. Test circuit
28/40
TDA7419 I2C bus specification
5 I2C bus specification
5.1 Interface protocol
The interface protocol comprises:
● a start condition (S)
● a chip address byte (the LSB 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
● 3.3 V logic compatible
5.1.1 Receive mode
S 1 0 0 0 1 0 0 R/W ACK TS AZ AI A4 A3 A2 A1 A0 ACK DATA ACK P
S = Start
R/W = "0" -> Receive Mode (Chip can be programmed by μP)
"1" -> Transmission Mode (Data could be received by μP)
ACK = Acknowledge
P = Stop
TS = Testing mode
AZ = AutoZero remain
AI = Auto increment
5.1.2 Transmission mode
S1000100R/WACKXXXXXXXSMACKP
SM = Soft-mute activated for main channel
X = Not Used
The transmitted data is automatic updated after each ACK. Transmission can be repeated
without new chip address.
5.1.3 Reset condition
A Power on reset is invoked if the supply voltage is below than 3.5 V. After that the following
data is written automatically into the registers of all subaddresses:
MSB LSB
11111110
29/40
I2C bus specification TDA7419
5.2 Subaddress (receive mode)
Table 7. Subaddress (receive mode
MSB LSB
I2 I1 I0 A4 A3 A2 A1 A0
0
1
0
1
0
1
0 0 0 0 0 Main source selector
0 0 0 0 1 Main loudness
0 0 0 1 0 Soft-mute / clock generator
000 1 1Volume
001 0 0Treble
001 0 1Middle
001 1 0Bass
Function
Testing mode
Off
On
AutoZero remain
Off
On
Auto increment mode
Off
On
0 0 1 1 1 Second source selector
0 1 0 0 0 Subwoofer / middle / bass
0 1 0 0 1 Mixing / gain effect
0 1 0 1 0 Speaker attenuator left front
0 1 0 1 1 Speaker attenuator right front
0 1 1 0 0 Speaker attenuator left rear
0 1 1 0 1 Speaker attenuator right rear
0 1 1 1 0 Mixing level control
0 1 1 1 1 Subwoofer attenuator
1 0 0 0 0 Spectrum analyzer / clock source / AC mode
1 0 0 0 1 Testing audio processor
30/40
TDA7419 I2C bus specification
5.3 Data byte specification
Table 8. Main selector (0)
MSB LSB
D7 D6 D5 D4 D3 D2 D1 D0
0
0
0
0
1
1
1
0
0
:
1
1
0
0
:
1
1
0
0
:
1
1
0
1
:
0
1
0
0
1
1
0
0
1
0
1
0
1
0
1
x
0
1
Function
Source selector
QD/SE: QD
SE1
SE2
SE3
QD/SE: SE
mute
mute
Input gain
0 dB
1 dB
:
14 dB
15 dB
AutoZero
on
off
Table 9. Main loudness (1)
MSB LSB
D7 D6 D5 D4 D3 D2 D1 D0
0
0
:
1
1
0
0
1
1
0
1
0
1
0
0
:
1
1
0
0
:
1
1
0
1
:
0
1
0
1
0
1
Function
Attenuation
0 dB
-1 dB
:
-14 dB
-1 5dB
Center frequency
Flat
400 Hz
800 Hz
2400 Hz
High boost
on
off
Loudness soft-step
on
off
31/40
I2C bus specification TDA7419
Table 10. Soft-mute / clock generator (2)
MSB LSB
Function
D7 D6 D5 D4 D3 D2 D1 D0
Soft-mute
0
on
1
off
Pin influence for mute
0
1
0
0
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
x
0
1
Pin and IIC
IIC
Soft-mute time
0.48 ms
0.96 ms
123 ms
Soft-step time
0.160 ms
0.321 ms
0. 642 ms
1.2 8ms
2.56 ms
5.12 ms
10.24 ms
20.48 ms
Clock fast mode
on
off
Table 11. Volume / speaker / mixing / subwoofer attenuation (3, 10-15)
MSB LSB
D7 D6 D5 D4 D3 D2 D1 D0
Gain/attenuation
0
0
:
0
0
0
:
1
1
1
0
0
:
0
0
0
:
0
0
1
0
0
:
0
1
1
:
1
1
x
0
0
:
1
0
0
:
1
1
x
0
0
:
1
0
0
:
1
1
x
0
0
:
1
0
0
:
1
1
x
0
+0 dB
1
+1 dB
:
:
1
+15 dB
0
-0 dB
1
-1 dB
:
:
0
-78 dB
1
-79 dB
x
mute
Soft-step
0
1
on
off
32/40
Function
TDA7419 I2C bus specification
Table 12. Treble filter (4)
MSB LSB
D7 D6 D5 D4 D3 D2 D1 D0
0
0
:
0
0
1
1
:
1
1
0
0
1
1
0
1
0
1
1
1
:
0
0
0
0
:
1
1
1
1
:
0
0
0
0
:
1
1
1
1
:
0
0
0
0
:
1
1
1
0
:
1
0
0
1
:
0
1
0
1
Table 13. Middle filter (5)
MSB LSB
D7 D6 D5 D4 D3 D2 D1 D0
Function
Gain/attenuation
-15 dB
-14 dB
:
-1 dB
0 dB
0 dB
+1 dB
:
+14 dB
+15 dB
Treble center frequency
10.0 kHz
12.5 kHz
15.0 kHz
17.5 kHz
Reference output select
External Vref (4 V)
Internal Vref (3.3 V)
Function
Gain/attenuation
0
0
:
0
0
1
1
:
1
1
1
1
:
0
0
0
0
:
1
1
1
1
:
0
0
0
0
:
1
1
1
1
:
0
0
0
0
:
1
1
1
-15dB
0
-14dB
:
:
1
-1dB
0
0dB
0
0dB
1
+1dB
:
:
0
+14dB
1
+15dB
Middle Q factor
0
0
1
1
0
1
0
1
0.5
0.75
1
1.25
Middle soft-step
0
1
on
off
33/40
I2C bus specification TDA7419
Table 14. Bass filter (6)
MSB LSB
D7 D6 D5 D4 D3 D2 D1 D0
0
0
:
0
0
1
1
:
1
1
0
0
1
1
0
1
0
1
1
1
:
0
0
0
0
:
1
1
1
1
:
0
0
0
0
:
1
1
1
1
:
0
0
0
0
:
1
1
1
0
:
1
0
0
1
:
0
1
0
1
Function
Gain/attenuation
-15 dB
-14 dB
:
-1 dB
0 dB
0 dB
+1 dB
:
+14 dB
+15 dB
Bass Q factor
1.0
1.25
1.5
2.0
Bass soft-step
on
off
Table 15. Second source selector (7)
MSB LSB
D7 D6 D5 D4 D3 D2 D1 D0
0
0
0
0
1
1
1
0
0
:
1
1
0
0
:
1
1
0
0
:
1
1
0
1
:
0
1
0
0
1
1
0
0
1
0
1
0
1
0
1
x
0
1
Function
Source selector
QD/SE: QD
SE1
SE2
SE3
QD/SE: SE
mute
mute
Input Gain
0dB
1dB
:
14dB
15dB
Rear Speaker Source
main source
second source
34/40
TDA7419 I2C bus specification
Table 16. Subwoofer /middle / bass (8)
MSB LSB
Function
D7 D6 D5 D4 D3 D2 D1 D0
Subwoofer cut-off frequency
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
flat
1
80 Hz
0
120 Hz
1
160 Hz
Middle center frequency
500 Hz
1000 Hz
1500 Hz
2500 Hz
Bass center frequency
60 Hz
80 Hz
100 Hz
200 Hz
Bass DC mode
0
1
0
1
on
off
Smoothing filter
on
off (bypass)
35/40
I2C bus specification TDA7419
Table 17. Mixing / gain effect (9)
MSB LSB
D7 D6 D5 D4 D3 D2 D1 D0
0
1
0
1
0
1
0
1
0
0
:
1
1
1
1
0
0
:
0
0
0
1
0
0
:
0
0
1
x
0
1
:
0
1
x
x
Function
Mixing to left front speaker
on
off
Mixing to right front speaker
on
off
Mixing enable
on
off
S
ubwoofer enable (OUTLR2 & OUTRR2)
on
off
Gain effect for HPF filter
4 dB
6 dB
:
20 dB
22 dB
0 dB
0 dB
Table 18. Spectrum analyzer / clock source / AC mode (16)
MSB LSB
D7 D6 D5 D4 D3 D2 D1 D0
0
1
0
1
0
1
0
1
0
1
Function
Spectrum analyzer filter Q factor
3.5
1.75
Reset mode
IIC
Auto
Spectrum analyzer source
Bass
In gain
Spectrum analyzer run
on
off
Reset
on
off
36/40
TDA7419 I2C bus specification
Table 18. Spectrum analyzer / clock source / AC mode (16) (continued)
MSB LSB
Function
D7 D6 D5 D4 D3 D2 D1 D0
Clock source
0
1
0
0
1
1
0
1
0
1
internal
external
Coupling mode
DC Coupling (without HPF)
AC coupling after In gain
DC Coupling (with HPF)
AC coupling after Bass
Table 19. Testing audio processor (17)
MSB LSB
D7 D6 D5 D4 D3 D2 D1 D0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
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
0
0
1
1
1
1
0
0
1
1
0
0
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
0
1
0
1
0
1
0
1
x
x
x
x
x
x
x
x
Function
Audio processor testing mode
off
on
Test multiplexer
Left In gain
Left In gain
Left Loudness
Left Loudness
Left Volume
Left Volume
Left Treble
Left Treble
Left Middle
SMCLK
Left Bass
VrefSCR
VGB1.26
SSCLK
Clock200
Mon
Ref5V5
BPout<1>
BPout<2>
BPout<3>
BPout<4>
BPout<5>
BPout<6>
BPout<7>
xx Not used
37/40
Package information TDA7419
6 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 25. SO-28 mechanical data and package dimensions
DIM.
A 2.65 0.104
a1 0.1 0.3 0.004 0.012
b 0.35 0.49 0.014 0.019
b1 0.23 0.32 0.009 0.013
C 0.5 0.020
c1 45° (typ.)
D 17.7 18.1 0.697 0.713
E 10 10.65 0.394 0.419
e 1.27 0.050
e3 16.51 0.65
F 7.4 7.6 0.291 0.299
L 0.4 1.27 0.016 0.050
S8
mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
(max.)
°
OUTLINE AND
MECHANICAL DATA
SO-28
38/40
TDA7419 Revision history
7 Revision history
Table 20. Document revision history
Date Revision Changes
20-Nov-2004 1 Initial release.
16-Mar-2005 2 Inserted new values in electrical characteristics table.
10-Jun-2005 3 Modified the figure 2 block diagram.
08-Oct-2005 4 Minor correction
13-Dec-2005 5 Updated “Absolute maximum ratings” table 3 and “Supply” table 2.
13-Feb-2009 6
Document reformatted.
Updated Section 6: Package information on page 38.
39/40
TDA7419
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