Datasheet TDA7464 Datasheet (SGS Thomson Microelectronics)

DIGITALLYCONTROLLEDAUDIO PROCESSOR WITH

SRS SURROUND SOUND AND VOICE CANCELLER

The Device incorporates the SRS
(Sound Retrieval System) under
licence fromSRS Labs, Inc.

4 STEREOINPUTS
INPUT ATTENUATION CONTROL IN 0.5dB

STEP
TREBLEMIDDLE ANDBASS CONTROL
VOICECANCELLERIS AVAILABLE
STEREO SRS SURROUND SOUND WITH

CENTER& SPACECONTROL IS AVAILABLE
THREE STANDARD SURROUND MODES

ARE AVAILABLE:

- MUSIC IN 4 DIFFERENTSELECTABLE
RESPONSES

- MOVIE AND SIMULATEDIN256
DIFFERENTSELECTABLE RESPONSES

2 SPEAKERSOUTPUTS

- INDEPENDENTATTENUATORS IN1dB
STEPFOR BALANCEFACILITY

- ZEROCROSSINGATTENUATIO NAVAILABLE

- INDEPENDENTMUTE FUNCTION

2 RECORD OUTPUTS

- INDEPENDENTATTENUATORS IN1dB
STEPFOR BALANCEFACILITY

- MUXAVAILABLE FORPROCESSESSIGNAL

SELECTIO N

- INDEPENDENTMUTE FUNCTION

ALL FUNCTIONS PROGRAMMABLE VIA SE­RIAL BUS

DESCRIPTION

The TDA7464 is a volumetone (bass middle and
treble) balance (Left/Right) processorswith stereo
SRS and voicecanceller for quality audio applica­tions in car radio, Hi-Fi, TV systems.
It reproduces SRS (Sound Retrieval System)
sound by external components and surround
sound by using phase shifters and a signal ma­trix. The AC signal setting is obtained by resistor
networks and switches combined with operational
amplifiers according to the SRS laboratories

TDA7464

TQFP44

ORDERING NUMBER: TDA7464

PIN CONNECTION

LP

PS1

PS2

PS3

VSPS4

CREF

R_IN4

R_IN3

R_IN2

LPVC

44 43 42 41 3940 38 37 36 35 34

1

LP1

2

HP1

3

HP2

4

NETW1

5

NETW2

6

VAR_L

VAR_R

7
8
9

10

12 13 14 15 16

BASS_RI

BASS_RO

MIDDLE_LI

MIDDLE_LO

MIDDLE_RO

171118 19 20 21 22

SDA

AGND

TREBLE_L

TREBLE_R

MIDDLE_RI

BASSO_L

BASSO_R

BASS_LO

BASS_LI

specification. Control of all the functions is ac­complishedby serial bus.
Thanks to the used BIPOLAR/CMOSTechnology,
Low Distortion, Low Noise and DC stepping are
obtained.

SCL

33
32
31
30
29
28
27
26
25
24
23

D96AU483C

R_IN1
VREFOUT
L_IN1
L_IN2
L_IN3
L_IN4
RECOUT_L
RECOUT_R
L_OUT
R_OUT
DIG_GND

February 1998

1/21

TDA7464

BLOCK DIAGRAM

SCL

SDA

L-OUT

RECOUT-L

25

27

ATT

SPKR

MUTE

N.B. SW

30K

2.2µF

BASSO-L VAR-L

79dB CONTROL

REC

79dB CONTROL

-

+

FIX

VAR

ATT

MUTE

DIG_GND

222123

SPKR

79dB CONTROL

FIX

R-OUT

RECOUT-R

24

26

ATT

MUTE

-

+

VAR

ATT

REC

MUTE

D96AU481D

N.B. SW

30K

89121834

2.2µF

BASSO-R VAR-R

79dB CONTROL

AMP

MIXING

EFFECT

CONTROL

LPF

9KHz

+

TREBLE MIDDLE BASS

3BAND

FIX

REAR

FIX

SRS

SURR

MIX SW

+

ON

VOICE

+LPF

-

BASS-RO

SURR

STEREO

REF

V

SUPPLY

31.5dB

control

BASS-RI

RM RB

17 16 13

130K

CENTER SPACE

NETW1NETW2

SRS

54

1K

0.47µF

LP

1.2nF

100K

VREFOUT

32

22µF

CREF

AGND

S

V

39 20 38 44

LPVC TREBLE-R

100nF

5.6K

100nF 100nF
MIDDLE-RO

2.7K

18nF 22nF

MIDDLE-RI

5.6nF

47.5K

1.5K 32.4K

4.42K

4.7nF

3.74K

0.47µF

SURR

MOVIE/

MUSIC

R5

3BAND

C BUS DECODER + LATCHES

2

I

REAR

BASS

MIDDLE

TREBLE

SURR

SRS

AMP

MIXING

SIM

OFF

MUSIC

SIM

MOVIE/

L-R

-

-

+

+

R6

-

+

+

FIX

BASS-LO

100nF

10 7 6

RB

BASS-LI

5.6K
100nF

MIDDLE-LO

22nF

2.7K
18nF

5.6nF

22nF

22nF

4.7nF

100nF

5.6nF 680nF

MIDDLE-LI

15 14 11

19

TREBLE-L

PS4

PS3

PS2

PS1

123 43 42 41 40

LP1 HP1 HP2

31.5dB control

RM

FIX

PS4

RPS4

400Hz

PS3

RPS3

400Hz

PS2

4KHz

RPS2

PS1

90Hz

RPS1

MIX SW

+

RHP1

RLP1

2/21

50K

50K

50K

L-IN3

50K

28

33

L-IN4

0.22µF

0.22µF

31

30

29

L-IN1

0.22µF

L-IN2

0.22µF

0.22µF

R-IN1

50K

50K

36

35

R-IN2

0.22µF

0.22µF

R-IN3

50K

50K

37

R-IN4

0.22µF

TDA7464

THERMAL DATA

Symbol Description Value Unit

R

thj-pins

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

T

amb

T

QUICK REFERENCE DATA

Symbol Parameter Min. Typ. Max. Unit

V

V

THD Total Harmonic DistortionV = 1Vrms f = 1KHz 0.01 0.1 %

S/N Signal to Noise Ratio V

S

Thermal Resistance Junction-pins Max. 85 °C/W

Operating Supply Voltage 11 V

S

Operating Ambient Temperature -10 to 85
Storage Temperature Range -55 to +150 °C

stg

Supply Voltage 7 9 10.2 V

S

CL

Max. input signal handling 2 Vrms

out = 1Vrms (mode = OFF) 106 dB

Channel Separation f = 1KHz 90 dB

C

Input Attenuation Control (0.5dB) -31.5 0 dB
Treble Control (2db step) -14 +14 dB
Middle Control (2db step) -14 +14 dB
Bass Control (2dB step) -14 +14 dB
Balance Control 1dB step (L

CH, RCH) -79 0 dB

Mute Attenuation 100 dB

C

°

ELECTRICALCHARACTERISTICS (refer to the test circuit T

= 1Vrms;RG= 600Ω, allcontrolsflat (G= 0dB), Effect Ctrl = -6dB, MODE = OFF; f = 1KHz

V

in

=25°C, VS= 9V,RL= 10KΩ,

amb

unless otherwise specified)

Symbol Parameter Test Condition Min. Typ. Max. Unit

SUPPLY

V

S

I

S

SVR Ripple Rejection L

Supply Voltage 7 9 10.2 V
Supply Current 25 mA

CH /RCHout, Mode = OFF 60 80 dB

INPUTSTAGE

R

IN

V

CL

A

RANGE

A

VMIN

A

VMAX

A

STEP

V

DC

A

VO1

A

VO2

Input Resistance 37.5 50 62.5 KΩ
Clipping Level THD = 0.3% 2 2.5 Vrms
Attenuation Range 31.5 dB
Min. Attenuation -1 0 1 dB
Max. Attenuation 31 31.5 32 dB
Step Resolution -1 0.5 1 dB
DC Steps Adjacent att. step -3 0 3 mV
Voice Canceller Output 1 LIN=RIN,RIN= ON,

V

= 0V FIX, 0dB attenuation

mix

Voice Canceller Output 2 LIN=RIN=0VV

mix

=1V

rms

FIX,

567dB

-1 0 1 dB

0dB attenuation

3/21

TDA7464

ELECTRICALCHARACTERISTICS (continued)

Symbol Parameter Test Condition Min. Typ. Max. Unit

SUPPLY

A

VO3

Voice Canceller Output 3 LIN=-RIN,V

= 0V FIX,

mix

567dB

0dB attenuation

R

LPV

Low Pass Filter Resistance 24 32 40 KΩ

BASSCONTROL

Gb Control Range Max. Boost/cut +12.0 +14.0 +16.0 dB

B

STEP

R

B

Step Resolution 1 2 3 dB
Internal Feedback Resistance 33 44 55 KΩ

MIDDLE CONTROL

Gm Control Range Max. Boost/cut +12.0 +14.0 +16.0 dB

M

STEP

R

M

Step Resolution 1 2 3 dB
Internal Feedback Resistance 18.75 25 31.25 K

TREBLECONTROL

Gt Control Range Max. Boost/cut +13.0 +14.0 +15.0 dB

T

STEP

Step Resolution 1 2 3 dB

STANDARDSURROUND SOUND MATRIX
TEST CONDITION (PhaseResistor SelectionD0=0, D1=1, D2=0.D3=1, D4=0, D5=1, D6=0,D7=1

Symbol Parameter Test Condition Min. Typ. Max. Unit

G

D

OFF

GOFF

In-phase Gain (OFF) ModeOFF, Input signal of

LR In-phase Gain Difference
(OFF)

G

MOV

D

GMOV

In-phase Gain (Movie) Movie mode, Effect Ctrl = -6dB

LR In-phase Gain Difference
(Movie)

G

MUS

D

GMUS

In-phase Gain (Music) Music mode, Effect Ctrl = -6dB

LR In-phase Gain Difference
(Music)

L

MON1

L

MON2

L

MON3

Simulated L Output 1 SimulatedMode,EffectCtrl= -6dB

Simulated L Output 2 SimulatedMode,EffectCtrl= -6dB

Simulated L Output 3 SimulatedMode, EffectCtrl= -6dB

1kHz, 1.4 V
Lin→ L

out

p-p,Rin

→

R

out

Mode OFF, Input signal of
1kHz, 1.4 V
R

→

in

Input signal of 1kHz, 1.4 V
R

→

in

R

out,Lin

R

out,Lin

p-p

→

→

L

out

L

p-p

out

Movie mode, Effect Ctrl = -6dB
Input signal of 1kHz, 1.4 V
(Rin→ R

)–(Lin→ L

out

Input signal of 1kHz, 1.4 V
(Rin→ R

), (Lin→ L

out

out

out

p-p

)

p-p

)

Music mode, Effect Ctrl = -6dB
Input signal of 1kHz, 1.4 V
(Rin→ R

)-(Lin→ L

out

out

p-p

)

Input signal of 250Hz,

1.4 V

p-p,Rin

and L

L

→

in

out

Input signal of 1kHz,

1.4 V

p-p,Rin

and Lin→ L

out

Input signal of 3.6kHz,

1.4 V

p-p,Rin

and Lin→ L

out

-1 0 1 dB

-1 0 1 dB

8dB

0dB

7dB

0dB

4.5 dB

– 4.0 dB

7.0 dB

Ω

4/21

TDA7464

ELECTRICALCHARACTERISTICS (continued)

Symbol Parameter Test Condition Min. Typ. Max. Unit

R

MON1

R

MON2

R

MON3

R

LP1

R

HPI

R

LPF

STANDARDSURROUND SOUNDEFFECT CONTROL

C

RANGE

S

STEP

SURROUNDSOUNDMATRIX PHASE

R

PS10

R

PS11

R

PS12

R

PS13

R

PS20

R

PS21

R

PS22

R

PS23

R

PS30

R

PS31

R

PS32

R

PS33

R

PS40

R

PS41

R

PS42

R

PS43

Simulated R Output 1 Simulated Mode,EffectCtrl=-6dB

– 4.5 dB

Input signalof 250Hz,

1.4 V

Simulated R Output 2 Simulated Mode,EffectCtrl=-6dB

p-p,Rin

and Lin→R

out

3.8 dB

Input signalof 1kHz,

1.4 V

p-p,Rin

and L

Simulated R Output 3 Simulated Mode,EffectCtrl=-6dB

R

→

in

out

–20 dB

Input signalof 3.6kHz,

1.4 V

p-p,Rin

and L

R

→

in

out

Low Pass Filter Resistance 7.5 10 12.5 KΩ
High Pass Filter Resistance 45 60 75 K
LP Pin Impedance 7.5 10 12.5 KΩ

Control Range - 21 - 6 dB
Step Resolution 1 dB

Phase Shifter1: D1 = 0, D0 = 0 8.8 11.8 14.8 KΩ
Phase Shifter1: D1 = 0, D0 = 1 10.6 14.1 17.6 K
Phase Shifter1: D1 = 1, D0 = 0 13.4 17.9 22.4 KΩ
Phase Shifter1: D1 = 1, D0 = 1 28 37.3 46.6 KΩ
Phase Shifter2: D3 = 0, D2 = 0 4.2 5.6 7 K
Phase Shifter2: D3 = 0, D2 = 1 5.1 6.8 8.5 KΩ
Phase Shifter2: D3 = 1, D2 = 0 6.3 8.4 10.5 K
Phase Shifter2: D3 = 1, D2 = 1 13.7 18.3 22.9 KΩ
Phase Shifter3: D5 = 0, D4 = 0 9 12.1 15.1 K
Phase Shifter3: D5 = 0, D4 = 1 10.9 14.5 18.1 KΩ
Phase Shifter3: D5 = 1, D4 = 0 13.6 18.1 22.6 KΩ
Phase Shifter3: D5 = 1, D4 = 1 29.3 39.1 48.9 KΩ
Phase Shifter4: D7 = 0, D6 = 0 9 12.1 15.1 KΩ
Phase Shifter4: D7 = 0, D6 = 1 10.9 14.5 18.1 K
Phase Shifter4: D7 = 1, D6 = 0 13.6 18.1 22.6 KΩ
Phase Shifter4: D7 = 1, D6 = 1 29.3 39.1 48.9 K

Ω

Ω

Ω

Ω

Ω

Ω

Ω

SRS SURROUND SOUND MATRIX

CENTER SRS Control Range -31 0 dB

Step

SPACE SRS Space ControlRange -31 0 dB

Step

P

ERSP1

P

ERSP2

L+R L+ R SRS Curve SPACE= MUTE,CENTER=0dB

L, R L, R SRS Curve SPACE= MUTE,

Center Step Resolution 1 dB

C

Space Step Resolution 1 dB

S

Perspective 1 Input Signalof 125Hz

12 dB
SPACE= 0dB,CENTER= MUTE
R

= GND; Lin→ R

in

Perspective 2 Input Signalof 2.15KHz

OUT

0dB
SPACE= 0dB,CENTER= MUTE
R

= GND; Li

in

n →ROUT

-8.5 dB

in = GND; Lin → ROUT

R

-13.4 dB
CENTER= MUTE
R

= GND; Lin→ L

in

OUT

Lin = GND; Rin → ROUT

5/21

TDA7464

ELECTRICALCHARACTERISTICS (continued)

Symbol Parameter Test Condition Min. Typ. Max. Unit

SPEAKER & RECORDATTENUATORS

C

range

S

STEP

E

A

V

DC

A

MUTE

R

VAR

SPEAKER ATTENUATORS

V

TH

AUDIOOUTPUTS

N

O(OFF)

N

O(MOV)

N

O(MUS)

N

O(SIM)

N

O(SRS)

d Distorsion Av = 0; V

S

C

V

OCL

R

OUT

V

OUT

BUS INPUTS

V

IL

V

IH

I

IN

V

O

Control Range 79 dB
Step Resolution 0.5 1 1.5 dB
Attenuation set error Av = 0 to -20dB -1.5 0 1.5 dB

Av = -20 to -79dB -3 0 2 dB

DC Steps Adjacent att. steps -3 0 3 mV
Output Mute Condition 70 100 dB
Input Impedance 22.5 30 37.5 KΩ

Zero CrossingThreshold D7 = 0

Output Noise (OFF) Output Mute, Flat

B

= 20Hz to 20KHz

W

Output Noise (Movie) Standard
Surround Sound

Output Noise (Music) Standard
Surround Sound

Output Noise (Simulated)
Standard Surround Sound

Output Noise (SRS)

Mode = Movie ,
B

= 20Hz to 20KHz

W

Mode = Music ,
B

= 20Hz to 20KHz,

W

Mode = Simulated,
B

= 20Hz to 20KHz

W

BW= 20Hz to 20KHz 50 µVrms

V

S

+ 20

2

4
5

30 µVrms

30

30 µVrms

Surround Sound

= 1Vrms 0.01 0.1 %

in

Channel Separation 70 90 dB
Clipping Level d = 0.3% 2 2.5 Vrms
Output Resistance 10 30 50 Ω
DC Voltage Level 3.8 V

Input Low Voltage 1V
Input High Voltage 3 V
Input Current -5 +5 µA
Output Voltage SDA

IO= 1.6mA 0.4 V

Acknowledge

mV

Vrms

µ

Vrms

µ

µVrms

6/21

TDA7464

I2C BUSINTERFACE
Data transmission from microprocessor to the

TDA7464 and viceversa takes place through the
2 wires I

2

C BUS interface, consisting of the two
lines SDA and SCL (pull-up resistors to positive
supply voltage mustbe connected).

Data Validity
As shown in fig. 3, the data on theSDA line must

be stable during the high period of theclock. The
HIGH and LOW state of the data line can only
change when the clock signal on the SCL line is
LOW.

Start andStop Conditions
As shown in fig.4 a start condition is a HIGH to

LOW transition of the SDA line while SCL is
HIGH. The stop condition is a LOWto HIGH tran­sition of the SDA linewhile SCL is HIGH.

Byte Format
Every byte transferredon the SDA line must con-

tain 8 bits. Each byte must be followed by an ac-

2

Figure 3: Data Validity on theI

CBUS

knowledgebit. The MSB is transferredfirst.
Acknowledge

The master (µP) puts a resistiveHIGHlevel on the
SDA line during the acknowledge clock pulse(see
fig. 5). The peripheral (audioprocessor) that ac­knowledges has to pull-down (LOW) the SDA line
duringthisclock pulse.

The audioprocessor which has been addressed
has to generate an acknowledge after the recep­tion of each byte, otherwise the SDA line remains
at the HIGH level during the ninth clock pulse
time. In this case the mastertransmitter can gen­erate the STOP information in order to abort the
transfer.

Transmission without Acknowledge
Avoiding to detect the acknowledge of the audio-

processor,the µP canuse a simplertransmission:
simply it waits one clock without checking the
slaveacknowledging,and sendsthe new data.

This approach of course is less protected from
misworking.

Figure 4: TimingDiagram of I

2

Figure 5: Acknowledgeon the I

CBUS

2

CBUS

7/21

TDA7464

SOFTWARESPECIFICATION

InterfaceProtocol
The interfaceprotocol comprises:

A start condition (S)

address
A subaddressbytes
A sequenceof data (N byte + achnowledge)
A stopcondition (P)

A chip address byte, containing the TDA7464

CHIP ADDRESS

MSB LSB MSB LSB MSB LSB

S100000A0ACK ACK DATA ACK P

D95AU226A

SUBADDRESS DATA 1 to DATA n

B DATA

ACK = Achnowledge
S = Start
P = Stop
A = Address
B = AutoIncrement

EXAMPLES
No IncrementalBus

rect chip address, a subaddresswith the MSB = 0
(no incremental bus), N-data (all these data con­cern the subaddressselected), a stop condition.

The TDA7464 receives a start condition, the cor-

CHIP ADDRESS

MSB LSB MSB LSB MSB LSB

S100000A0ACK ACK DATA ACK P

D95AU306

IncrementalBus

The TDA7464 receives a start condition, the cor­rect chip address,a subaddresswith the MSB = 1
(incremental bus): now it is in a loop condition
with an autoincrease of the subaddress whereas

CHIP ADDRESS

MSB LSB MSB LSB MSB LSB

S100000A0ACK ACK DATA ACK P

D95AU307

SUBADDRESS DATA

0D3

X X X D2 D1 D0

SUBADDRESS from ”1XXX1010”to ”1XXX1111”
of DATAare ignored.
The DATA 1 concerns thesubaddress sent, and
the DATA 2 concerns the subaddress sent plus
one in the loop etc. and, at the end, it receives the
stop condition.

SUBADDRESS DATA 1 to DATA n

1D3

X X X D2 D1 D0

8/21

DATA BYTES (Address= 80(HEX)):
FUNCTIONSELECTION:

The firstbyte (subaddress)

MSB LSB SUBADDRESS

D7 D6 D5 D4 D3 D2 D1 D0

B X X X 0 0 0 0 INPUT ATTENUATION
B X X X 0 0 0 1 SURROUND & OUT & EFFECT

CONTROL
B X X X 0 0 1 0 PHASE RESISTOR
B X X X 0 0 1 1 BASS
B X X X 0 1 0 0 MIDDLE & TREBLE
B X X X 0 1 0 1 SPEAKER ATTENUATION ”L”
B X X X 0 1 1 0 SPEAKER ATTENUATION ”R”
B X X X 0 1 1 1 RECORD ATTENUATION ”L”
B X X X 1 0 0 0 RECORD ATTENUATION”R”
B X X X 1 0 0 1 INPUT MULTIPLEXER, VOICE

CANCELLER & REC OUT
B X X X 1 0 1 0 SRS / SPACE ATTENUATION
B X X X 1 0 1 1 SRS / CENTER ATTENUATION

B = 1 INCREMENTALBUS; ACTIVE
B = 0 NOINCREMENTAL BUS;
X = DON’TCARE

TDA7464

INPUT ATTENUATION SELECTION

MSB LSB INPUT ATTENUATION

D7 D6 D5 D4 D3 D2 D1 D0 0.5 dB STEPS

1 000 0
1 0 0 1 -0.5
1 010 -1
1 0 1 1 -1.5
1 100 -2
1 1 0 1 -2.5
1 110 -3
1 1 1 1 -3.5

4 dB STEPS

1000 0
1001 -4
1010 -8
1011 -12
1100 -16
1101 -20
1110 -24
1111 -28

INPUT ATTENUATION= 0 ∼ -31.5dB

9/21

TDA7464

STANDARD SURROUND SELECTION

MSB LSB

D7 D6 D5 D4 D3 D2 D1 D0 SURROUND MODE

0 0 SIMULATED
0 1 MUSIC
1 0 OFF
1 1 MOVIE

OUT

0 VAR
1 FIX

EFFECT CONTROL

0000 -6
0001 -7
0010 -8
0011 -9
0100 -10
0101 -11
0110 -12
0111 -13
1000 -14
1001 -15
1010 -16
1011 -17
1100 -18
1101 -19
1110 -20
1111 -21

PHASE RESISTORSELECTION

MSB LSB

D7 D6 D5 D4 D3 D2 D1 D0 PHASE SHIFT 1 (KΩ)

00 12
01 14
10 18
11 37

00 6
01 7
10 8
11 18

00 12
01 14
10 18
11 39

00 12
01 14
10 18
11 39

SURROUND PHASE

RESISTOR

PHASE SHIFT 2 (KΩ)

PHASE SHIFT 3 (KΩ)

PHASE SHIFT 4 (KΩ)

10/21

BASS SELECTION

MSB LSB BASS

D7 D6 D5 D4 D3 D2 D1 D0 2 dB STEPS

10000 -14
10001 -12
10010 -10
10011 -8
10100 -6
10101 -4
10110 -2
10111 0
11111 0
11110 2
11101 4
11100 6
11011 8
11010 10
11001 12
11000 14

TDA7464

11/21

TDA7464

MIDDLE& TREBLE SELECTION

MSB LSB MIDDLE

D7 D6 D5 D4 D3 D2 D1 D0 2 dB STEPS

0000 -14
0001 -12
0010 -10
0011 -8
0100 -6
0101 -4
0110 -2
0111 0
1111 0
1110 2
1101 4
1100 6
1011 8
1010 10
1001 12
1000 14

TREBLE

2 dB STEPS

0000 -14
0001 -12
0010 -10
0011 -8
0100 -6
0101 -4
0110 -2
0111 0
1111 0
1110 2
1101 4
1100 6
1011 8
1010 10
1001 12
1000 14

12/21

TDA7464

LEFT CHANNEL SPEAKER ATTENUATION SELECTION

MSB LSB SPEAKER/RECORD ATT

D7 D6 D5 D4 D3 D2 D1 D0 1 dB STEPS

000 0
001 -1
010 -2
011 -3
100 -4
101 -5
110 -6
111 -7

8 dB STEPS

0000 0
0001 -8
0010 -16
0011 -24
0100 -32
0101 -40
0110 -48
0111 -56
1000 -64
1001 -72

MUTE

101X
11XX

LEFT & RIGHTCHANNELS BOTH

MSB LSB ZERO CROSS ATT. MODE

D7 D6 D5 D4 D3 D2 D1 D0 1 dB STEPS

0 ON
1 OFF

X = DON’TCARE
SPEAKER/RECORDATTENUATION= 0dB

∼

-79dB

13/21

TDA7464

RECORDAND RIGHT CHANNEL SPEAKER ATTENUATION SELECTION

MSB LSB SPEAKER/RECORD ATT

D7 D6 D5 D4 D3 D2 D1 D0 1 dB STEPS

000 0
001 -1
010 -2
011 -3
100 -4
101 -5
110 -6
111 -7

8 dB STEPS

0000 0
0001 -8
0010 -16
0011 -24
0100 -32
0101 -40
0110 -48
0111 -56
1000 -64
1001 -72

MUTE

101X
11XX

X = DON’TCARE
SPEAKER/RECORDATTENUATION= 0dB

∼

-79dB

VOICE CANCELLER/INPUT/RECOUT L & R SELECTION

MSB LSB

D7 D6 D5 D4 D3 D2 D1 D0 VOICE CANCELLER

1 0 OFF
1 1ON

INPUT MULTIPLEXER

1 0 0 0 0 IN_2
1 0 1 0 1 IN_3
1 1 0 1 0 IN_4
1 1 1 1 1 IN_1

REC OUT ”L”

1 0 0 VAR 1 (3BAND)
1 0 1 VAR 2 (SURR)
1 1 0 VAR 3 (REAR)
1 1 1 FIX

REC OUT ”R”

1 0 0 VAR 1(3BAND)
1 0 1 VAR 2 (SURR)
1 1 0 VAR 3 (REAR)
111 FIX

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TDA7464

SRS SPACE CONTROL: ATTENUATION SELECTION

MSB LSB SPACE ATTENUATION

D7 D6 D5 D4 D3 D2 D1 D0 1 dB STEPS

000 0
001 -1
010 -2
011 -3
100 -4
101 -5
110 -6
111 -7

8 dB STEPS

000 0
001 -8
010 -16
011 -24

MUTE

1XXXXX

X = DON’TCARE

∼

SPEAKER/RECORDATTENUATION= 0dB

-31dB

SRS CENTER CONTROL:ATTENUATION SELECTION

MSB LSB CENTER ATTENUATION

D7 D6 D5 D4 D3 D2 D1 D0 1 dB STEPS

000 0
001 -1
010 -2
011 -3
100 -4
101 -5
110 -6
111 -7

8 dB STEPS

000 0
001 -8
010 -16
011 -24

MUTE

1XXXXX

SRS INPUT

0 NO SURROUND SIGNAL
1 SURROUND SIGNAL

SRS SWITCH

0 SRS ON
1 SRS OFF

X = DON’TCARE

∼

SPACEATTENUATION= 0dB

-31dB
RECOMMENDED TO ATTENUATE-3dB IN INPUTATTENUATION DURING ”SRS OFF”
TO FULFILL SRS BYPASSMODE WHEN SRSFUNCTIONIS USED

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TDA7464

POWER ON RESET

SURROUND & OUT CONTROL+ EFFECT CONTROL OFF + FIX + MAX ATTENUATION
SPEAKER/RECORD ATTENUATION L &R MODE MUTE + ZERO CROSS ATT.OFF
INPUT ATTENUATION + REAR SWITCH MAX ATTENUATION + ON
VOICE CANCELLER OFF
INPUT IN1
MIX SWITCH NO MIX PIN
SRS SURROUND OFF + MAX ATTENUATION
BASS & MIDDLE 2dB
TREBLE 0dB

PIN DESCRIPTION

PINS: L-OUT, R-OUT, RECOUT-L, RECOUT-R

V

S

10Ω

20µAGND

D96AU477

GND

GND

PIN: HP2

V

S

PIN: HP1

LP1

HP2

V

S

GND

10K

60K

D94AU198

PIN: L-IN1, R-IN1, L-IN2, R-IN2,L-IN3, R-IN3,

L-IN4,R-IN4,

V

S

16/21

HP1

GND

5.5K

60K

D94AU199

5.5K

20µA

GND

20µA

50K

V

REF

D94AU200

TDA7464

PIN: VAR-L, VAR-R,

V

S

SW

30K

Vref

GND

PIN: LP1

V

S

20µA

D95AU227

20µA

PIN: CREF

V

S

PIN: SCL, SDA

GND

20K

20K

20µA

42K

D95AU336

20µA

10K

GND

HP1

PIN: PS1, PS2, PS3, PS4, LP

V

S

GND

20µA

D94AU211

D95AU308

PIN: NETW2

GND

GND

D94AU205

V

S

20µA

D96AU473

17/21

TDA7464

PIN: BASSO-L,BASSO-R,NETW1

V

S

20µA

GND

D95AU230

PIN: BASS-LO,BASS-RO,MIDDLE-LO,MIDDLE-RO,

V

S

20µA

PIN: BASS-LI,BASS-RI,MIDDLE-LI,MIDDLE-RI,

V

S

20µA

45K

:

GND

BASS-LO

BASS-RO,MIDDLE-LO,MIDDLE-RO

or

25K

Bass

: MIDDLE

D95AU231A

PIN: TREBLE-L,TREBLE-R

V

S

20µA

(*)

GND

BASS-LI,BASS-RI,MIDDLE-LI,MIDDLE-RI

(*) 45K :

Bass

25K : MIDDLE

PIN: VOUT REF

V

S

20µA

GND

10K

GND

D95AU232

D95AU233A

GND

D95AU309

PIN: NBLIN, NBRIN

V

S

D95AU234

25K

20µA

SWGND

18/21

PIN: NBLO, NBRO

V

S

GND

D95AU235A

TDA7464

VREF

19/21

TDA7464

DIM.

mm inch

MIN. TYP. MAX. MIN. TYP. MAX.

A 1.60 0.063

A1 0.05 0.15 0.002 0.006

A2 1.35 1.40 1.45 0.053 0.055 0.057

B 0.30 0.37 0.45 0.012 0.014 0.018

C 0.09 0.20 0.004 0.008

D 12.00 0.472

D1 10.00 0.394

D3 8.00 0.315

e 0.80 0.031

E 12.00 0.472

E1 10.00 0.394

E3 8.00 0.315

D

D1

2333

34

B

44

1

e

22

E3D3E1

12

11

TQFP44

L1

E

L

0.10mm
.004

SeatingPlane

B

K

A

A2

A1

C

20/21

TDA7464

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rightsof third parties which may result from its use. No
license is granted by implicationor otherwise under any patent or patentrights of SGS-THOMSON Microelectronics. Specification mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized foruseas criticalcomponents in life support devices or systems without express
written approval of SGS-THOMSON Microelectronics.

 1998 SGS-THOMSON Microelectronics – Printedin Italy – AllRights Reserved

The Sound Retrieval Systemand are registered trademarks of SRSLabs, Inc.

SGS-THOMSON Microelectronics GROUP OF COMPANIES

Australia - Brazil - Canada- China - France- Germany - Italy - Japan - Korea - Malaysia -Malta - Morocco - The Netherlands -

Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.

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