ST TDA7418 User Manual
Features
■ Input multiplexer
– PD/SE4: pseudo differential stereo input,
programmable as single-ended input
– SE1: stereo single-end input
– SE2: stereo single-end input
– SE3: stereo single-end input
– Input gain adjust from 0 to 15dB with 1dB
steps
– Internal offset-cancellation (AutoZero)
■ Loudness
– Second order frequency response
– Programmable center frequency
(400 Hz / 800 Hz / 2400 Hz)
– 15dB with 1dB steps
– Selectable low and high frequency boost
– Selectable flat-mode (constant attenuation)
■ Volume
– +15dB to -79dB with 1dB step resolution
– Soft-step control with programmable blend
times
■ Bass
– Second 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 to 15dB range with 1dB resolution
■ Middle
– Second order frequency response
– Center frequency programmable in 4 steps
(500 Hz / 1 kHz / 1.5 kHz / 2.5 kHz)
Table 1. Device summary
TDA7418
3 band car audio processor
SO20
– Q programmable 0.5/0.75/1.0/1.25
– -15 to 15dB range with 1dB resolution
■ Treble
– Second order frequency response
– Center frequency programmable in 4 steps
(10 kHz / 12.5 kHz / 15 kHz / 17.5 kHz)
– -15 to 15dB range with 1dB resolution
■ Speaker
– 4 independent soft step speaker controls,
+15dB to -79dB with 1dB steps direct mute
■ Subwoofer
– Single-ended mono output
– Independent soft step level control, +15dB
to -79dB with 1dB steps
■ Mute functions
– Direct mute
– Digitally controlled SoftMute with 3
programmable mute-times
(0.48 ms / 0.96 ms /123 ms)
Description
The TDA7418 includes a high performance audio
processor with fully integrated 3-Band filters to
process signals at audible frequencies. The digital
control allows a full programming of the
audioprocessor and filters characteristics.
Order code Temp range, °CPackage Packing
TDA7418 -40 to +85 SO20 Tube
TDA7418TR -40 to +85 SO20 Tape and reel
November 2008 Rev 3 1/29
www.st.com
1
Contents TDA7418
Contents
1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Connection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Pin list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Electrical specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4 Description of the audioprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1 Input stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2 AutoZero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.3 Loudness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3.1 Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3.2 Peak frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3.3 Low and high frequency boost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.3.4 Flat mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.4 SoftMute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.5 SoftStep volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.6 Bass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.6.1 Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.6.2 Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.6.3 Quality factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.6.4 DC mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.7 Middle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.7.1 Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.7.2 Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.7.3 Quality factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.8 Treble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.8.1 Attenuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.8.2 Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.9 Speaker attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2/29
TDA7418 Contents
4.10 Subwoofer attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.11 MUX output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.12 Audioprocessor testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5I
2
C bus specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.1 Interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.1.1 Receive mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.1.2 Transmission mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.1.3 Reset condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.2 Subaddress (receive mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.3 Data byte specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3/29
List of tables TDA7418
List of tables
Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Pin list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 3. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 4. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 5. Registers of all subaddresses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 6. Subaddress (receive mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Table 7. Input selector /gain (0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Table 8. Loudness (1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Table 9. Volume / speaker attenuation (2,7,8,9,10,11). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 10. Treble filter (3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 11. Middle filter (4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 12. Bass filter (5). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table 13. Middle / bass Fc select (6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table 14. Soft mute and soft step time (12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Table 15. Testing audio processor (13) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Table 16. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4/29
TDA7418 List of figures
List of figures
Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 2. Pin out. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 3. Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 4. Loudness attenuation @ f
Figure 5. Loudness center frequencies @ Attn. = 15dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 6. Loudness attenuation, fc = 2.4kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 7. Softmute timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 8. SoftStep timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 9. Bass control @ f
= 80Hz, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
C
Figure 10. Bass center frequencies @ Gain = 15dB, Q = 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 11. Bass quality factors @ Gain = 14dB, f
Figure 12. Bass normal and DC mode @ Gain = 14dB, f
Figure 13. Middle control @ f
= 1 kHz, Q = 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
C
Figure 14. Middle center frequencies @ Gain = 14dB, Q = 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 15. Bass quality factors @ Gain = 14dB, f
Figure 16. Treble control @ f
= 17.5 kHz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
C
Figure 17. Treble center frequencies @ Gain = 14dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 18. MUX output configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 19. SO20 mechanical data and package dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
= 400Hz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
C
= 80Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
C
= 1kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
C
= 80Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
C
5/29
Block diagram TDA7418
1 Block diagram
Figure 1. Block diagram
OUTLF
16
Softstep
Mono Fader
Treble Middle Bass
Softstep
Volume
OUTRF
13
Softstep
Mono Fader
OUTLR
15
Softstep
Mono Fader
OUTRR
14
Softstep
Mono Fader
OUTSW
12
Softstep
Mono Fader
MIX
CBUS
2
DIGITAL CONTROL I
AC00057
SCL SDA
17
MUTE/MUXOUT
SoftMute
Loudness
+
InGain
AutoZero
DIFFL 7
SE1L 5
DIFFR 9
DIFFG 8
6/29
INPUT
MULTIPLEXER
SE2L 3
SE1R 6
3
7 6 18 19
SUPPLY
VDD GND CREF
SE3L 1
SE2R 4
SE3R 2
TDA7418 Pin description
2 Pin description
2.1 Connection diagram
Figure 2. Pin out
2.2 Pin list
Table 2. Pin list
No. Pin Name Description I/O
1 SE3L Single-ended input 3 left channel I
2 SE3R Single-ended input 3 right channel I
3 SE2L Single-ended input 2 left channel I
4 SE2R Single-ended input 2 right channel I
5 SE1L Single-ended input 1 left channel I
6 SE1R Single-ended input 1 Right channel I
7 DIFFL Pseudo differential stereo input left I
8 DIFFG Pseudo differential stereo input common I
9 DIFFR Pseudo differential stereo input right I
10 CREF Reference capacitor O
11 GND Ground S
12 OUTSW Subwoofer output O
13 OUTRF Front right output O
14 OUTRR Rear right output O
15 OUTLR Rear left output O
16 OUTLF Front left output O
17 MUTE / MUXOUT External mute pin / MUX output I
18 SCL I
19 SDA I
20 VDD Supply S
SE3L
SE3R
SE2L
SE2R
SE1L
SE1R
DIFFL
DIFFG
DIFFR OUTSW
CREF GND
2
3
4
5
6
7
8
9
10
2
C bus clock I
2
C bus data I/O
20
19
18
17
16
15
14
13
12
11
VDD1
SDA
SCL
MUTE/MUXOUT
OUTLF
OUTLR
OUTRR
OUTRF
AC00058
7/29
Electrical specification TDA7418
3 Electrical specification
3.1 Absolute maximum ratings
Table 3. Absolute maximum ratings
Symbol Parameter Value Unit
V
Supply voltage for V
S
CC
(1)
for other pins
-0.4 to 10.2
-0.4 to VCC + 0.4
V
T
T
V
ESD
V
ESD
V
ESD
1. Reference level is GND.
Operating temperature range -40 to +85 °C
op
Storage temperature -55 to +150 °C
stg
ESD protection (Human Body Model) ±2000 V
ESD protection (Machine Model) ±200 V
ESD protection (Change Device Model) ±750 V
3.2 Electrical characteristics
S
CL
IN
DC
V
= 8.5 V; T
S
S
Supply voltage 8 8.5 10 V
= 25 °C; RL= 10 kΩ; all gains = 0 dB; f = 1 kHz; unless otherwise specified
amb
Supply current 18 25 32 mA
in
Input resistance All single ended inputs 70 100 130 kΩ
Clipping level 1.8 2 V
Input separation 80 100 dB
Min. input gain -0.5 0 0.5 dB
Max. input gain 14 15 16 dB
Step resolution 0.5 1 1.5 dB
Adjacent gain steps -5 1 5 mV
DC steps
G
MIN to GMAX
-30 4 30 mV
Remaining offset with AutoZero 0.5 mV
Table 4. Electrical characteristics
Symbol Parameter Test condition Min. Typ. Max. Unit
Supply
V
I
Input selector
R
V
S
G
IN MIN
G
IN MAX
G
STEP
V
V
offset
Differential stereo inputs
RMS
Rin Input resistance Differential 70 100 130 kΩ
CMRR Common mode rejection ratio
=1 V
CM
=1 V
V
CM
@ 1kHz 40 60 dB
RMS
@ 10kHz 40 60 dB
RMS
V
8/29
TDA7418 Electrical specification
Table 4. Electrical characteristics (continued)
V
= 8.5 V; T
S
Symbol Parameter Test condition Min. Typ. Max. Unit
= 25 °C; RL= 10 kΩ; all gains = 0 dB; f = 1 kHz; unless otherwise specified
amb
e
No
Output noise @ speaker outputs
Loudness control
A
A
f
MAX
STEP
Peak
Max. attenuation -16 -15 -14 dB
Step resolution 0.5 1 1.5 dB
Peak frequency
Volu m e c o n tr o l
G
A
A
V
MAX
MAX
STEP
E
A
E
T
DC
Max. gain 14 15 16 dB
Max. attenuation -84 -79 -74 dB
Step resolution 0.5 1 1.5 dB
Attenuation set error
Tracking error 2 dB
DC steps
Soft mute
(1)
20Hz-20kHz,flat;
all stages 0dB
f
P1
f
P2
f
P4
360 400 440 Hz
720 800 880 Hz
2.1 2.4 2.7 kHz
12 20 μV
G = -20 to +15dB -1 0 1 dB
G = -79 to -20dB -4 0 3 dB
Adjacent Attenuation Steps -3 0.1 3 mV
From 0dB to G
MIN
-10 0.5 10 mV
A
MUTE
T
V
TH Low
V
TH High
R
PU
V
PU
D
Mute attenuation 80 100 dB
Delay time
Low threshold for SM pin 0.7 V
High threshold for SM pin 2.7 V
Internal pull-up resistor 32 45 58 kΩ
Internal pull-up voltage 3.3 V
Bass control
fc Center frequency
(1)
T1 0.48 ms
T2 0.96 ms
T3 123 ms
f
C1
f
C2
f
C3
f
C4
54 60 66 Hz
72 80 88 Hz
90 100 110 Hz
180 200 220 Hz
9/29
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