STMicroelectronics TDA7419 Schematic [ru]

TDA7419

Fi

3 BAND CAR AUDIO PROCESSOR

1 FEATURES

■ 4 STEREO INPUTS

■ SOFT STEP VOLUME

■ BASS, MIDDLE, TREBLE AND LOUDNESS

■ DIRECT MUTE AND SOFTMUTE

■ FOUR INDEPENDENT SPEAKER OUTPUTS

■ SUB WOOFER OUTPUT

■ SOFT STEP SPEAKER/SUBWOOFER

CONTROL

■ 7 BANDS SPECTRUM ANALYZER

■ DIGITAL CONTROL:

2

–I

C-BUS INTERFACE

2 DESCRIPTION

The TDA7419 is a high performance signal proces­sor specifically designed for car radio applications.
The device includes a high performance audiopro-

Figure 2. Block Diagram

MUTE

SAOUT SACLK

SAOUT SACLK

Spectrum

Spectrum

Analyzer

Analyzer

MUTE

gure 1. Package

SO-28

Table 1. Order Codes

Part Number Package

TDA7419 SO-28

TDA7419TR SO-28 in Tape & Reel

cessor with fully integrated audio filters. 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.

ACOUTL/

ACOUTR/

ACINL/

ACOUTL/
AC2OUTL

AC2OUTL

ACOUTR/
AC2OUTR

AC2OUTR

ACINL/

FILOL

FILOL

ACINR/

ACINR/

FILOR

FILOR

DIFFL

DIFFL

DIFFG

DIFFG

DIFFR

DIFFR

SE1L

SE1L

SE1R

SE1R

MULTIPLEXER

MULTIPLEXER

SE2L

SE2L

SE2R

SE2R

VDD CREFGND

VDD CREFGND

March 2005

INPUT

INPUT

SUPPLY

SUPPLY

InGain

InGain

AutoZero

AutoZero

VREFOUTF

VREFOUTF

Loudness MiddleTreble BassSoftMute

Loudness MiddleTreble BassSoftMute

DIGITAL CONTROL

DIGITAL CONTROL

DIGITAL CONTROL

Softstep

Softstep
Volume

Volume

I2C BUS

I2C BUS

I2C BUS

Softstep

Softstep

HPF

Softstep

Softstep

Softstep

Softstep

Softstep

Softstep

Softstep

Softstep

Softstep

Softstep

HPF

MonoFader

MonoFader

MonoFader

MonoFader

MonoFader

MonoFader

MonoFader

MonoFader

Subwoofer

Subwoofer

LPF

LPF

AC2INL/

SDASCL

SDASCL

AC2INL/

SE3L

SE3L

AC2INR/

AC2INR/

SE3R

SE3R

MonoFader

MonoFader

MonoFader

MonoFader

HPF

HPF

Mix

Mix

Mix

Mix

OUTLF

OUTLF

OUTRF

OUTRF

OUTLR

OUTLR

OUTRR

OUTRR

OUTSW/

OUTSW/
OUTLR2

OUTLR2

MIX/

MIX/

OUTSW/

OUTSW/
OUTRR2

OUTRR2

Rev. 2

1/30

TDA7419

Table 2. Supply

Symbol Parameter Test Condition Min. Typ. Max. Unit

V

Supply Voltage 7.5 8.5 10.5 V

s

Supply Current Vs = 8.5V 30 35 40 mA

I

s

SVRR Ripple Rejection @ 1KHz Audioprocessor(all Filters flat) 60 dB

Table 3. Thermal Data

Symbol Parameter Value Unit

R

Th j-pins

Thermal Resistance Junction-pins max 85 °C/W

Table 4. Absolute Maximum Ratings

Symbol Parameter Value Unit

V

Operating Supply Voltage 10.5 V

s

T

T

Operating Temperature Range -40 to 85 °C

amb

Storage Temperature Range -55 to +150 °C

stg

ESD

All pins are protected against ESD according to the MIL883 standard.

Figure 3. Pin connection (Top view)

ACOUTR/AC2OUTR

ACINR/FILOR

ACINL/FILOL

ACOUTL/AC2OUTL

SE3L/ACINL

SE3R/ACINR

SE2L

SE2R

SE1L OUTLF

SE1R OUTLR

DIFFL

DIFFG

DIFFR OUTSW/OUTLR2

2

3

4

5

6

7

8

9

10

12

13

28

27

26

25

24

23

22

21

20

19

18

17

16

1514CREF GND

D04AU1569

MIX/OUTSW/OUTRR21

VREF

SAOUT

SAIN

VDD

SDA

SCL

MUTE

OUTRR11

OUTRF

2/30

Table 5. Pin Description

TDA7419

Pin

N#

1 ACOUTR / AC2OUTR AC coupling right output / DSO filter AC2OUT right channel O

2 ACINR / FILOR AC coupling right input / DSO filter FILO right channel I/O

3 ACINL / FILOL AC coupling left input / DSO filter FILO left channel I/O

4 ACOUTL / AC2OUTL AC coupling left output / DSO 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

16 OUTSW / OUTLR2

17 OUTRF Front right output O

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 MIX / OUTSW / OUTRR2

Pin Name Function I/O

Subwoofer output / 2

Mix input / Additional subwoofer output / 2

nd

rear left output

nd

rear right output

O

I/O

3/30

TDA7419

3 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 / DSO 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 2nd order frequency response

programmable center frequency (400Hz/800Hz/2400Hz)
15dB with 1dB steps
selectable low & high frequency boost
selectable flat-mode (constant attenuation)

Volume +15dB to -79dB with 1dB step resolution

soft-step control with programmable blend times

Bass 2nd order frequency response

center frequency programmable in 4 steps (60Hz/80Hz/100Hz/200Hz)
Q programmable 1.0/1.25/1.5/2.0
DC gain programmable

-15 to 15dB range with 1dB resolution

Middle 2nd order frequency response

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

Treble 2nd order frequency response

center frequency programmable in 4 steps (10KHz/12.5KHz/15KHz/17.5KHz)

-15 to 15dB range with 1dB resolution

Spectrum analyzer seven bandpass filters

2nd order frequency response
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 SoftMute with 3 programmable mute-times(0.48ms/0.96ms/
123ms)

Effect gain effect, or high pass effect with fixed external components

4/30

TDA7419

4 ELECTRICAL CHARACTERISTICS

Table 6. Electrical Characteristcs

V

= 8.5V; T

S

Symbol Parameter Test Condition Min. Typ. Max. Unit

SUPPLY

Vs Supply Voltage 8 8.5 10 V

I

S

INPUT SELECTOR

R

in

V

CL

S

IN

G

IN MIN

G

IN MAX

G

STEP

V

DC

V

offset

DIFFERENTIAL STEREO INPUTS

R

in

CMRR Common Mode Rejection Ratio V

e

No

MIXING CONTROL

M

LEVEL

G

MAX

A

MAX

A

STEP

LOUDNESS CONTROL

A

MAX

A

STEP

f

Peak

VOLUME CONTROL

G

MAX

A

MAX

A

STEP

E

A

E

T

V

DC

= 25°C; RL= 10kΩ ; all gains = 0dB; f = 1kHz; unless otherwise specified

amb

Supply Current 27 37 47 mA

Input Resistance All single ended inputs 70 100 130 kΩ

Clipping level All Input 1.8 2 V

QD input 1.7 2 V

Input Separation 80 100 dB

Min. Input Gain -1 0 1 dB

Max. Input Gain 13 15 17 dB

Step Resolution 0.5 1 1.5 dB

DC Steps Adjacent Gain Steps -5 1 5 mV

G

MIN

to G

MAX

-20 4 20 mV

Remaining offset with AutoZero 0.5 mV

Input Resistance Differential 70 100 130 KΩ

=1 VRMS@ 1kHz 46 70 dB

CM

=1 VRMS@ 10kHz 46 60 dB

V

CM

Output Noise @ Speaker Outputs 20Hz-20kHz,flat;all stages 0dB 12 µV

Mixing Ratio Main / Mix Source -6/-6 dB

Max Gain 13 15 17 dB

Max Attenuation -83 -79 -75 dB

Step Resolution 0.5 1 1.5 dB

Max Attenuation -17 -15 -13 dB

Step Resolution 0.5 1 1.5 dB

Peak Frequency

f

P1

f

P2

f

P3

360 400 440 Hz

720 800 880 Hz

2200 2400 2600 Hz

Max Gain 13 15 17 dB

Max Attenuation -83 -79 -75 dB

Step Resolution 0.5 1 1.5 dB

Attenuation Set Error G = -20 to +20dB -0.75 0 +0.75 dB

G = -79 to -20dB -4 0 3 dB

Tracking Error 2dB

DC Steps Adjacent Attenuation Steps -3 0.1 3 mV

From 0dB to G

MIN

-5 0.5 5 mV

RMS

RMS

5/30

TDA7419

Table 6. Electrical Characteristcs (continued)

V

= 8.5V; T

S

Symbol Parameter Test Condition Min. Typ. Max. Unit

SOFT MUTE

A

MUTE

T

D

V

TH Low

V

TH High

R

PU

V

PU

BASS CONTROL

Fc Center Frequency f

Q

BASS

C

RANGE

A

STEP

DC

GAIN

MIDDLE CONTROL

C

RANGE

A

STEP

f

c

Q

BASS

TREBLE CONTROL

C

RANGE

A

STEP

fc Center Frequency f

= 25°C; RL= 10kΩ ; all gains = 0dB; f = 1kHz; unless otherwise specified

amb

Mute Attenuation 80 100 dB

Delay Time T1 0.48 1 ms

T2 0.96 2 ms

T3 70 123 170 ms

Low Threshold for SM Pin 1 V

High Threshold for SM Pin 2.5 V

Internal pull-up resistor 32 45 58

Internal pull-up Voltage 3.3 V

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

Quality Factor Q

C1

f

C2

f

C3

f

C4

1

Q

2

Q

3

Q

4

Control Range ±14 ±15 ±16 dB

Step Resolution 0.5 1 1.5 dB

Bass-DC-Gain DC = off -1 0 +1 dB

DC = on (shelving filter, use for

-4.4 dB

cut only)

Control Range ±14 ±15 ±16 dB

Step Resolution 0.5 1 1.5 dB

Center Frequency f

Quality Factor Q

C1

f

C2

f

C3

f

C4

1

Q

2

Q

3

Q

4

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

Clipping Level ±14 ±15 ±16 dB

Step Resolution 0.5 1 1.5 dB

C1

f

C2

f

C3

f

C4

81012kHz

10 12.5 15 kHz

12 15 18 kHz

14 17.5 21 kHz

kΩ

6/30

TDA7419

Table 6. Electrical Characteristcs (continued)

V

= 8.5V; T

S

Symbol Parameter Test Condition Min. Typ. Max. Unit

SPEAKER ATTENUATORS

G

MAX

A

MAX

A

STEP

A

MUTE

E

E

V

DC

AUDIO OUTPUTS

V

CL

R

OUT

R

L

C

L

V

DC

SUBWOOFER ATTENUATOR

G

MAX

A

MAX

A

STEP

A

MUTE

E

E

V

DC

SUBWOOFER LOWPASS

f

LP

HPF EFFECT

G

MAX

G

MIN

A

STEP

SPECTRUM ANALYZER CONTROL

V

SAOut

f

C1

f

C2

f

C3

f

C4

f

C5

f

C6

f

C7

Q Quality Factor Q1 1.62 1.8 1.98

f

SAClk

t

Sadel

= 25°C; RL= 10kΩ ; all gains = 0dB; f = 1kHz; unless otherwise specified

amb

Max Gain 14 15 16 dB

Max Attenuation -83 -79 -75 dB

Step Resolution 0.5 1 1.5 dB

Mute Attenuation 80 90 dB

Attenuation Set Error 2 dB

DC Steps Adjacent Attenuation Steps -5 0.1 5 mV

Clipping level d = 0.3% 1.8 2 V

Output impedance 30 100 Ω

Output Load Resistance 2 kΩ

Output Load Capacitor 10 nF

DC Voltage Level 3.8 4.0 4.2 V

Max Gain 14 15 16 dB

Max Attenuation -83 -79 -75 dB

Step Resolution 0.5 1 1.5 dB

Mute Attenuation 80 90 dB

Attenuation Set Error 2 dB

DC Steps Adjacent Attenuation Steps -5 1 5 mV

Lowpass Corner Frequency f

f

f

LP1

LP2

LP3

72 80 88 Hz

108 120 132 Hz

144 160 176 Hz

Max Gain 21 22 23 dB

Min Gain 3 4 5 dB

Step Resolution 1.5 2 2.5 dB

Output Voltage Range 0 3.3 V

Center Frequency Band 1 5.5 62 69 Hz

Center Frequency Band 2 141 157 173 Hz

Center Frequency Band 3 356 392 436 Hz

Center Frequency Band 4 0.9 1 1.1 kHz

Center Frequency Band 5 2.26 2.51 2.76 kHz

Center Frequency Band 6 5.70 6.34 6.98 kHz

Center Frequency Band 7 14.4 16 17.6 kHz

Q2 3.15 3.5 3.85

Clock Frequency 3 100 kHz

Analog Output Delay Time 2 µs

RMS

7/30

TDA7419

Table 6. Electrical Characteristcs (continued)

V

= 8.5V; T

S

Symbol Parameter Test Condition Min. Typ. Max. Unit

t

repeat

t

intres

GENERAL

e

NO

S/N Signal to Noise Ratio all gain = 0dB flat; V

DDistortion V

S

C

= 25°C; RL= 10kΩ ; all gains = 0dB; f = 1kHz; unless otherwise specified

amb

Spectrum Analyzer Repeat Time 50 ms

Internal Reset Time 4.5 ms

Output Noise BW=20Hz to 20 kHz all gain =

12 20 µV

0dB

BW=20Hz to 20 kHz Output

615µV

muted

= 1V

IN

=2V

o

RMS

; all stages 0dB 0.01 0.1 %

RMS

100 dB

Channel Separation left/right 80 90 dB

5 DESCRIPTION OF THE AUDIOPROCESSOR

5.1 Input stages

In the basic configuration, one stereo quasi-differential and three (two in case of DSO applications) single
ended stereo inputs are available.

5.1.1 Quasi-differential stereo Input (QD)

The QD input is implemented as a buffered quasi-differential stereo stage with 100k input-impedance at
each input. The attenuation is fixed to -3dB in order to adapt the incoming signal level.

5.1.2 Single-ended stereo input (SE1, SE2, SE3/AC2IN)

The input-impedance at each input is 100k 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 DSO applications (AC2IN)

Figure 4. Input Stage

QD_L
QD_G
QD_R

SE1_L

SE1_R

SE2_L

SE2_R

AC2IN_L/SE3L

AC2IN_R/SE3R

QD

SE1

SE2

SE3

QD

SE4

SE1

SE2

SE3

Main

Source

In Gain

8/30

Second
Source

Output Stage

TDA7419

5.2 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).

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.

5.2.1 AutoZero-Remain

In some cases, for example if the P 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, 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.

5.3 Loudness

There are four parameters programmable in the loudness stage:

5.3.1 Attenuation

Figure 5 shows the attenuation as a function of frequency at f

= 400Hz

P

Figure 5. Loudness Attenuation @ f

5

0

-5

-10

-15

-20
10

= 400Hz.

P

100

1K

10K

9/30

TDA7419

5.3.2 Peakr Frequency

Figure 6 shows the three possible peak-frequencies 400Hz , 800Hz and 2.4kHz.

Figure 6. Loudness Center frequencies @ Attn. = 15dB

5

0

-5

-10

-15

-20
10

100

1K

5.3.3 Low & High Frequency Boost

Figure 7 shows the different Loudness-shapes in low & high frequency boost.

Figure 7. Loudness Attenuation , fC = 2.4KHz

5

0

-5

-10

-15

10K

10/30

-20
10

100

1K

10K

5.3.4 Flat Mode

In flat mode the loudness stage works as a 0dB to -15dB attenuator.

TDA7419

5.4 SoftMute

2

The digitally controlled SoftMute stage allows muting/demuting the signal with a I
slope. The mute process can either be activated by the SoftMute pin or by the I

C-bus programmable

2

C-bus. This slope is real-

ized in a special S-shaped curve to mute slow in the critical regions (see Figure 8).

For timing purposes the Bit0 of the I2C-bus output register is set to 1 from the start of muting until the end
of demuting.

Figure 8. Sofmute Timing

1

EXT.

MUTE

+SIGNAL

REF

-SIGNAL

1

2

I

C BUS

OUT

D97AU634

Time

Note: Please notice that a started Mute-action is always terminated and could not be interrupted by a change of the mute -signal

5.5 SoftStep-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 SoftStep 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 9. SoftStep Timing

V

OUT

1dB

0.5dB

SS Time

-0.5dB

-1dB

Note: For steps more than 0.5dB the SoftStep mode should be deactivated because it could generate a hard 1dB step during the blend-time.

D00AU1170

Time

11/30

TDA7419

5.6 Bass

There are four parameters programmable in the bass stage:

5.6.1 Attenuation

Figure 9 shows the attenuation as a function of frequency at a center frequency of 80Hz.

Figure 10. Bass Control @ f

15.0

10.0

5.0

= 80Hz, Q = 1

C

dB

0.0

-5.0

-10.0

-15.0

10.0 100.0 1.0K 10.0K

Hz

5.6.2 Center Frequency

Figure 11 shows the four possible center frequencies 60, 80, 100 and 200Hz.

Figure 11. Bass center Frequencies @ Gain = 15dB, Q = 1

16

12

8

4

0

-4
10

12/30

100

1K

10K

5.6.3 Quality Factors

Figure 12 shows the four possible quality factors 1, 1.25, 1.5 and 2.

Figure 12. Bass Quality factors @ Gain = 14dB, fC = 80Hz

15.0

12.5

10.0

7.5

5.0

2.5

TDA7419

0.0

10.0 100.0 1.0K 10.0K

5.6.4 DC Mode

It is used for cut only for shelving filter. In this mode the DC-gain is increased by 4.4dB. Inaddition 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 = 14dB, fC = 80Hz

15.0

12.5

10.0

7.5

5.0

2.5

0.0

10.0 100.0 1.0K 10.0K

Note: The center frequency, Q and DC-mode can be set fully independently.

13/30

TDA7419

5.7 Middle

There are three parameters programmable in the middle stage:

5.7.1 Attenuation

Figure 14 shows the attenuation as a function of frequency at a center frequency of 1kHz.

Figure 14. Middle Control @ f

= 1 kHz, Q = 1

C

5.7.2 Center Frequency

Figure 14 shows the four possible center frequencies 500Hz, 1kHz, 1.5kHz and 2.5kHz.

Figure 15. Middle center Frequencies @ Gain = 14dB, Q = 1

14/30

5.7.3 Quality Factors

Figure 16 shows the four possible quality factors 0.5, 0.75, 1 and 1.25.

Figure 16. Middle Quality factors @ Gain = 14dB, fc = 1kHz

TDA7419

5.8 Treble

There are two parameters programmable in the treble stage:

5.8.1 Attenuation

Figure 16 shows the attenuation as a function of frequency at a center frequency of 17.5kHz.

Figure 17. Treble Control @ f

20

15

10

5

0

-5

-10

-15

= 17.5kHz

C

-20
10

100

1K

10K

15/30

TDA7419

5.8.2 Center Frequency

Figure 18 shows the four possible center frequencies 10k, 12.5k, 15k and 17.5kHz.

Figure 18. Treble Center Frequencies @ Gain = 15dB

20

15

10

5

0

-5
10

100

1K

10K

5.9 Subwoofer Filter

The subwoofer lowpass filter has butterworth characteristics with programmable cut-off frequency (80/
120/160Hz)

Figure 19. Subwoofer Control

16/30

TDA7419

5.10 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
whenever SAclk remains high for the time t

. Note that a proper reset requires the clock signal SAclk

intres

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 20. Spectrum analyzer block diagram

. A reset of the sample capacitors is induced

Sadel

Figure 21. Timing of the spectrum analyzer

17/30

TDA7419

5.11 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
attenuator is available at the AC-Outputs. The input-impedance of this AC-Inputs is 50kΩ.

Figure 22. Diagram of AC coupling

2

C-Bus. In short condition, the input-signal of the speaker-

ACINR

Speakers

To Output

From Input MUX

InGain

ACOUTR ACOUTL

Filters

ACINL

5.12 DSO Applications

For DSO applications, DSO filter is available for additional processing after the speaker control. It is a 2nd
order Butterworth highpass filter with selectable flat mode. Figure 23 shows the diagram of the DSO that
includes an external RC network.

Figure 23. DSO diagram

External RC network

From speaker

18/30

ACOUT
/AC2OUT

SE3IN
/AC2IN

ACIN
/FILO

Gain Control

To
output

TDA7419

5.13 Output Selector and Mixing

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 24. Output Selector

Mix_in

Attenuator

Main

Second

BassL+BassR

Attenuator

Attenuator

Subwoofer

filter

Attenuator

Front

Rear

Subwoofer
output

5.14 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.

5.15 Test Circuit

Figure 25. Test Circuit

19/30

TDA7419

6I2C BUS SPECIFICATION

6.1 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 500kbits/s

– 3.3V logic compatible

6.1.1 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 = Auto zero remain

AI = Auto increment

6.1.2 Transmission Mode

1 0 0 0 1 0 0 R/W ACK X X X X X X X SM ACK P

S

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.

6.1.3 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

11111110

20/30

6.2 Subaddress (receive mode)

Table 7. Subaddress (receive mode)

MSB LSB FUNCTION

I2 I1 I0 A4 A3 A2 A1 A0

Testing Mode

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

0 0 0 1 1 Volume

001 0 0Treble

0 0 1 0 1 Middle

001 1 0Bass

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

Off
On

Auto Zero Remain

Off
On

Auto Increment Mode

Off
On

TDA7419

21/30

TDA7419

6.3 Data Byte Specification

Table 8. Main Selector (0)

MSB LSB FUNCTION

D7 D6 D5 D4 D3 D2 D1 D0

Source Selector

QD/SE: QD

0
0
0
0
1
1
1

0
0

:
1
1

0
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

SE1
SE2
SE3
QD/SE: SE
mute
mute

Input Gain

0dB
1dB
:
14dB
15dB

Auto Zero

on
off

Table 9. Main Loudness (1)

MSB LSB FUNCTION

D7 D6 D5 D4 D3 D2 D1 D0

Attenuation

0dB

0
0

:
1
1

0
0
1
1

0
1

0
1

0
1
0
1

0
0

:
1
1

0
0

:
1
1

0

-1dB

1

:

:

-14dB

0

-15dB

1

Center Frequency

Flat
400Hz
800Hz
2400Hz

High Boost

on
off

Loudness Soft Step

on
off

22/30

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
1

0
0
1
1
0
0
1
1

0
1
0
1
0
1
0
1

0
1
x

Pin and IIC
IIC

Soft Mute Time

0.48ms

0.96ms
123ms

Soft Step Time

0.160ms

0.321ms

0. 642ms

1.28ms

2.56ms

5.12ms

10.24ms

20.48ms

Clock Fast Mode

on
off

TDA7419

Table 11. Volume / Speaker / Mixing / Subwoofer Attenuation (3, 10-15)

MSB LSB FUNCTION

D7 D6 D5 D4 D3 D2 D1 D0

Gain/Attenuation
+0dB

0
0

:
0
0
0

:
1
1
1

0
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
1

:
1
0
1

:
0
1

x

+1dB
:
+15dB

-0dB

-1dB
:

-78dB

-79dB
mute

Soft Step
on
off

23/30

TDA7419

Table 12. Treble Filter (4)

MSB LSB FUNCTION

D7 D6 D5 D4 D3 D2 D1 D0

Gain/Attenuation

-15dB

0
0

:
0
0
1
1

:
1
1

0
0
1
1

0
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

-14dB

0

:

:

-1dB

1

0dB

0

0dB

0

+1dB

1

:

:

+14dB

0

+15dB

1

Treble Center Frequency

10.0kHz

12.5kHz

15.0kHz

17.5kHz

Reference Output Select

External Vref (4V)
Internal Vref (3.3V)

Table 13. Middle Filter (5)

MSB LSB FUNCTION

D7 D6 D5 D4 D3 D2 D1 D0

Gain/Attenuation

-15dB

0
0

:
0
0
1
1

:
1
1

0
0
1
1

0
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

-14dB

0

:

:

-1dB

1

0dB

0

0dB

0

+1dB

1

:

:

+14dB

0

+15dB

1

Middle Q Factor

0.5

0.75
1

1.25

Middle Soft Step

on
off

24/30

Table 14. Bass Filter (6)

MSB LSB FUNCTION

D7 D6 D5 D4 D3 D2 D1 D0

Gain/Attenuation

-15dB

0
0

:
0
0
1
1

:
1
1

0
0
1
1

0
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

-14dB

0

:

:

-1dB

1

0dB

0

0dB

0

+1dB

1

:

:

+14dB

0

+15dB

1

Bass Q Factor

1.0

1.25

1.5

2.0

Bass Soft Step

on
off

TDA7419

Table 15. Second Source Selector (7)

MSB LSB FUNCTION

D7 D6 D5 D4 D3 D2 D1 D0

Source Selector

QD/SE: QD

0
0
0
0
1
1
1

0
0

:
1
1

0
1

0
0

:
1
1

0
0

:
1
1

0
1

:
0
1

0
0
1
1
0
0
1

0

SE1

1

SE2

0

SE3

1

QD/SE: SE

0

mute

1

mute

x

Input Gain

0dB
1dB
:
14dB
15dB

Rear Speaker Source

main source
second source

25/30

TDA7419

Table 16. Subwoofer /Middle / Bass (8)

MSB LSB FUNCTION

D7 D6 D5 D4 D3 D2 D1 D0

Subwoofer Cut-off Frequency

flat

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

80Hz

1

120Hz

0

160Hz

1

Middle Center Frequency

500Hz
1000Hz
1500Hz
2500Hz

Bass Center Frequency

60Hz
80Hz
100Hz
200Hz

Bass DC Mode

on
off

Smoothing Filter

on
off (bypass)

Table 17. Mixing / Gain Effect (9)

MSB LSB FUNCTION

D7 D6 D5 D4 D3 D2 D1 D0

Mixing to Left Front Speaker

0

on

1

off

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

Mixing to Right Front Speaker

on
off

Mixing Enable
on
off

Subwoofer Enable (OUTLR2 & OUTRR2)

on
off

Gain Effect for DSO Filter

4dB
6dB
:
20dB
22dB
0dB
0dB

26/30

Table 18. Spectrum Analyzer / Clock Source / AC Mode (16)

MSB LSB FUNCTION

D7 D6 D5 D4 D3 D2 D1 D0

Spectrum Analyzer Filter Q Factor

0

3.5

1

1.75

0
1

0
1

0
1

0
1

0
1

0
0
1
1

0
1
0
1

Reset Mode

IIC
Auto

Spectrum Analyzer Source

Bass
InGain

Spectrum Analyzer Run

on
off

Reset

on
off

Clock Source

internal
external

Coupling Mode

DC Coupling (without DSO)
AC coupling after InGain
DC Coupling (with DSO)
AC coupling after Bass

TDA7419

Table 19. Testing Audio Processor (17)

MSB LSB FUNCTION

D7 D6 D5 D4 D3 D2 D1 D0

Audio Processor Testing Mode

off

0

on

1

Test Multiplexer

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1

xx Not used

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

Left InGain
Left InGain
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>

27/30

TDA7419

Figure 26. SO-28 Mechanical Data & 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

28/30

Table 20. Revision History

Date Revision Description of Changes

November 2004 1 First Issue

March 2005 2 Inserted new values in Electrical Characteristics

TDA7419

29/30

TDA7419

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted
by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject
to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not
authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.

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