STMicroelectronics TDA7418 Schematic [ru]

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

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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

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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

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