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