Datasheet TDA7466 Datasheet (SGS Thomson Microelectronics)

DIGITALLYCONTROLLEDAUDIO PROCESSOR WITH

SRS SURROUND SOUND AND VOICE CANCELLER

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

1 STEREOINPUT
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:

- MUSICIN 4 DIFFERENTSELECTABLE
RESPONSES

- MOVIE ANDSIMULATED IN256
DIFFERENTSELECTABLE RESPONSES

2 SPEAKERSOUTPUTS

- INDEPENDENTATTENUATORS IN1dB
STEPFOR BALANCEFACILITY

- ZEROCROSSINGATTENUAT IONAVAILABLE

- AVAILABILITYOF LOUDSPEAKERS
EQUALIZATION FIXEDBY EXTERNAL
COMPONENTS

- INDEPENDENTMUTE FUNCTION

2 RECORD OUTPUTS

- INDEPENDENTATTENUATORS IN1dB
STEPFOR BALANCEFACILITY

- MUXAVAILABLE FORPROCESSESSIGNAL

SELECTIO N

- INDEPENDENTMUTE FUNCTION

ALL FUNCTIONS PROGRAMMABLE VIA SE­RIAL BUS

DESCRIPTION

The TDA7466 is a volume tone (bassmiddle 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
specification. Control of all the functions is ac-

TDA7466

SDIP42

ORDERING NUMBER: TDA7466

PIN CONNECTION

1

V

S

LP

LP1

2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21

D96AU445A

PS4
PS3
PS2
PS1 R_IN

HP1
HP2

VAR_L

BASSO_L

VAR_R

BASSO_R

BASS_LO

BASS_LI

BASS_RO

BASS_RI

MIDDLE_LO

MIDDLE_LI

MIDDLE_RO

MIDDLE_RI

complishedby serialbus.
Thanks to the used BIPOLAR/CMOSTechnology,
Low Distortion, Low Noise and DC stepping are
obtained.

42
41
40
39
38
37
36
35
34
33
32
31
30
29

27
26
25
24
23
22

CREF
NBRO
NBRIN
LPVC

VREFOUT
L_IN
NBLIN
NBLO
NETW2
NETW1
RECOUT_L
RECOUT_R
L_OUT
R_OUT28
DIG_GND
SCL
SDA
AGND
TREBLE_L
TREBLE_R

May 1997

1/21

TDA7466

BLOCK DIAGRAM

SCL

SDA

DIG_GND

262527

79dB CONTROL

ATT

REC

79dB CONTROL

SPKR

-

VAR

L-OUT

29

ATT

MUTE

+

FIX

MUTE

RECOUT-L

31

NB1

3435

NB2

NBLIN NBLO

NB-LA NB-LB

2.2µF

30K

BASSO-L VAR-L

ATT

SPKR

79dB CONTROL

+

FIX

28

R-OUT

-

VAR

MUTE

REC

RECOUT-R

30

ATT

MUTE

D96AU446B

NB4

NB3

NBRIN NBRO

30K

1213162239

BASSO-R VAR-R

79dB CONTROL

NB-RA NB-RB

2.2µF

5.6K

2.7K

100nF

100nF

22nF

18nF

5.6nF

22nF

22nF

4.7nF

100nF

5.6nF 680nF

BASS-LO

14 11 10

BASS-LI

MIDDLE-LO

MIDDLE-LI

19 18 15

23

TREBLE-L

PS4

PS3

PS2

PS1

789 5 4 3 2

LP1 HP1 HP2

31.5dB control

SRS

SIM

MOVIE/

R6

REAR

SURR

OFF

-

3BAND

C BUS DECODER + LATCHES

2

I

BASS

MIDDLE

TREBLE

AMP

MIXING

MUSIC

SIM

MOVIE/

-

L-R

-

+

+

+

+

FIX

RB

RM

RPS4

RPS3

RPS2

RPS1

MIX SW

36

L-IN

0.22µF

SURR

FIX

PS4

400Hz

PS3

400Hz

MUSIC

PS2

4KHz

PS1

90Hz

+

R5

RHP1

RLP1

50K

AMP

MIXING

EFFECT

CONTROL

LPF

9KHz

+

TREBLE MIDDLE BASS

FIX

-

SURR

3BAND

FIX

SRS

VOICE

BASS-RO

SURR

REAR

RM RB

21 20 17

CENTER SPACE

SRS

32 33

STEREO

100K

+

REF

V

37 40 41

ON

SUPPLY

+LPF

12442 6

31.5dB

control

50K

38

R-IN

100K

0.22µF

NETW2NETW1

1K

LP

CREF

AGND

S

V

LPVC TREBLE-R

BASS-RI

100nF 100nF
MIDDLE-RO

18nF 22nF

MIDDLE-RI

130K

0.47µF

1.2nF

VREFOUT

22µF

100nF

5.6nF

5.6K

2.7K

4.7nF

3.74K

47.5K

0.47µF

1.5K 32.4K

4.42K

2/21

TDA7466

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 Distortion V = 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, allcontrols flat (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 /RCH out, 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

TDA7466

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 Selection D0=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) Mode OFF, 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= -

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

6dB
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

TDA7466

ELECTRICALCHARACTERISTICS (continued)

Symbol Parameter Test Condition Min. Typ. Max. Unit

R

MON1

R

MON2

R

MON3

R

LP1

R

HPI

R

LPF

STANDARDSURROUND SOUND EFFECT CONTROL

C

RANGE

S

STEP

SURROUND SOUNDMATRIX 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 SimulatedMode,EffectCtrl= -6dB

– 4.5 dB

Input signal of 250Hz,

1.4 V

Simulated R Output 2 SimulatedMode,EffectCtrl= -6dB

p-p,Rin

and Lin→R

out

3.8 dB

Input signal of 1kHz,

1.4 V

p-p,Rin

and L

Simulated R Output 3 SimulatedMode,EffectCtrl= -6dB

R

→

in

out

–20 dB

Input signal of 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 Shifter 1:D1 = 0, D0 = 0 8.8 11.8 14.8 KΩ
Phase Shifter 1:D1 = 0, D0 = 1 10.6 14.1 17.6 K
Phase Shifter 1:D1 = 1, D0 = 0 13.4 17.9 22.4 KΩ
Phase Shifter 1:D1 = 1, D0 = 1 28 37.3 46.6 KΩ
Phase Shifter 2:D3 = 0, D2 = 0 4.2 5.6 7 K
Phase Shifter 2:D3 = 0, D2 = 1 5.1 6.8 8.5 KΩ
Phase Shifter 2:D3 = 1, D2 = 0 6.3 8.4 10.5 K
Phase Shifter 2:D3 = 1, D2 = 1 13.7 18.3 22.9 KΩ
Phase Shifter 3:D5 = 0, D4 = 0 9 12.1 15.1 K
Phase Shifter 3:D5 = 0, D4 = 1 10.9 14.5 18.1 KΩ
Phase Shifter 3:D5 = 1, D4 = 0 13.6 18.1 22.6 KΩ
Phase Shifter 3:D5 = 1, D4 = 1 29.3 39.1 48.9 KΩ
Phase Shifter 4:D7 = 0, D6 = 0 9 12.1 15.1 KΩ
Phase Shifter 4:D7 = 0, D6 = 1 10.9 14.5 18.1 K
Phase Shifter 4:D7 = 1, D6 = 0 13.6 18.1 22.6 KΩ
Phase Shifter 4: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 Control Range -31 0 dB

Step

P

ERSP1

P

ERSP2

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

Center Step Resolution 1 dB

C

Space Step Resolution 1 dB

S

Perspective 1 Input Signal of 125Hz

12 dB
SPACE= 0dB,CENTER= MUTE
R

in = GND; Lin → ROUT

Perspective 2 Input Signal of 2.15KHz

0dB
SPACE= 0dB,CENTER= MUTE
R

= GND; Lin→ R

in

OUT

-8.5 dB
=0dB
R

= GND; Li

in

n →ROUT

5/21

TDA7466

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

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
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
µVrms

Vrms

µ

Vrms

µ

Ω

6/21

TDA7466

I2C BUSINTERFACE
Data transmission from microprocessor to the

TDA7466 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 the SDA 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 transferred on 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 resistiveHIGHlevelon 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 master transmitter 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 can use a simpler transmission:
simply it waits one clock without checking the
slaveacknowledging,and sends the 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

TDA7466

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 TDA7466

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 TDA7466 receives a start condition, the cor-

CHIP ADDRESS

MSB LSB MSB LSB MSB LSB

S100000A0ACK ACK DATA ACK P

D95AU306

Incremental Bus

The TDA7466 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

BXXX0000INPUT ATTENUATION
BXXX0001SURROUND & OUT & EFFECT

CONTROL
BXXX0010PHASERESISTOR
BXXX0011BASS& NATURAL BASE
BXXX0100MIDDLE & TREBLE
BXXX0101SPEAKERATTENUATION ”L”
BXXX0110SPEAKERATTENUATION ”R”
BXXX0111RECORD ATTENUATION ”L”
BXXX1000RECORD ATTENUATION”R”
BXXX1001INPUT MULTIPLEXER, VOICE

CANCELLER & REC OUT
BXXX1010SRS/SPACE ATTENUATION
BXXX1011SRS/CENTER ATTENUATION

B = 1 INCREMENTAL BUS; ACTIVE
B = 0 NOINCREMENTAL BUS;
X = DONT’CARE

TDA7466

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

TDA7466

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

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

NATURAL BASE

0

1

NBRIN, NBRO, NBLIN,
NBLO PIN ACTIVE

NO NBRIN, NBRO, NBLIN,
NBLO PIN

When external componentsaren’t connected, the data from NATURAL BASE must put ”OFF”

TDA7466

11/21

TDA7466

MIDDLE& TREBLESELECTION

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

TDA7466

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

TDA7466

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

1 110 OFF
1 111 ON

REC OUT ”L”

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

REC OUT ”R”

1 0 0 1 1 VAR 1(3BAND)
1 0 1 1 1 VAR 2 (SURR)
1 1 0 1 1 VAR 3 (REAR)
111 11 FIX

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TDA7466

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 SRS FUNCTION IS USED

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TDA7466

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
NATURAL BASE OFF
VOICE CANCELLER OFF
INPUT IN1
MIX SWITCH NO MIX PIN
SRS SURROUND OFF + MAX ATTENUATION
BASS & MIDDLE 2dB
TREBLE 0dB

PIN DESCRIPTION

PIN: L-OUT, R-OUT, RECOUT-L, RECOUT-R

V

S

10Ω

20µAGND

D96AU477

GND

GND

PIN: HP2

V

S

PIN: HP1

LP1

HP2

PIN: L-IN, R-IN

V

V

S

10K

60K

GND

D94AU198

S

16/21

HP1

GND

5.5K

60K

D94AU199

5.5K

20µA

GND

20µA

50K

V

REF

D94AU200

TDA7466

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

TDA7466

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-R I,

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

TDA7466

VREF

19/21

TDA7466

SDIP42 PACKAGE MECHANICAL DATA

DIM.

mm inch

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

A 5.08 0.20
A1 0.51 0.020
A2 3.05 3.81 4.57 0.120 0.150 0.180

B 0.38 0.46 0.56 0.0149 0.0181 0.0220
B1 0.89 1.02 1.14 0.035 0.040 0.045

c 0.23 0.25 0.38 0.0090 0.0098 0.0150
D 36.58 36.83 37.08 1.440 1.450 1.460
E 15.24 16.00 0.60 0.629

E1 12.70 13.72 14.48 0.50 0.540 0.570

e 1.778 0.070

e1 15.24 0.60
e2 18.54 0.730
e3 1.52 0.060

L 2.54 3.30 3.56 0.10 0.130 0.140

E

E1

A2

A1

LA

BeB1

D

42

1

22

21

c

SDIP42

e1
e2

E

.015
0,38

Gage Plane

e3
e2

20/21

TDA7466

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 rights of 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 systemswithout express
written approval of SGS-THOMSON Microelectronics.

 1997 SGS-THOMSON Microelectronics – Printedin Italy – AllRights Reserved

The Sound Retrieval Systemand are registered trademarks of SRS Labs, Inc.

SGS-THOMSON Microelectronics GROUP OF COMPANIES

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

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

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