Datasheet TDA7467D, TDA7467 Datasheet (SGS Thomson Microelectronics)

AUDIO MATRIX WITH SRS EFFECTS

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

1 STEREOINPUT
INPUT ATTENUATION CONTROL IN 0.5dB

STEP

- MUTE FUNCTION
MONOMODE (SRS3D MONO)
STEREOMODE (SRS3D STEREO)
SPACE AND CENTER ATTENUATORS ARE

AVAILABLE
ALL FUNCTION ARE PROGRAMMABLE VIA

SERIALBUS (I

2

C BUS)

TDA7467

DIP28

ORDERING NUMBER: TDA7467

DESCRIPTION

The TDA7467is a SRS(Sound Retrieval System)
audio matrix. It reproduces SRS sound process­ing stereo and mono sourcesboth.

The SRS sound is guaranteed by external com­ponents and it is not affected by internal process
spreads.

The AC signal setting is obtained by resistor net­works and switches combined with operational
amplifiers according to the SRS labs specifica-

PIN CONNECTION(Topview)

LOUT

RIN

LIN

DIG_GND

SCL HP6

ADDR

SDA

AGND

PS1
PS2
PS3
PS4
PS5
PS6

1
2
3
4
5
6
7
8
9
10
11
12
13
14

SO28

ORDERING NUMBER: TDA7467D

tion.
Controlofall thefunctionsisaccomplishedbyserial

bus. Thanks to the used BIPOLAR/CMOS/DMOS
technology, Low Distortion, Low Noise and DC
stepping are obtained.

28
27
26
25
24

22
21
20
19
18
17
16
15

D96AU507

ROUT
CREF
LP2
LP1

HP523
HP4
V

S

HP3
HP2
HP1
VREFOUT
NETW2
NETW1

May 1997

1/11

TDA7467

BLOCK DIAGRAM

1

L-OUT

SCL

576

SDA

ADDR

4

DIG_GND

R-OUT

2

D96AU506

C BUS DECODER + LATCHES

2

I

MONO

+

FIX

SRS

MONO

+

SPACE

4.7nF

3.74K

0.47µF

22µF

CREF

AGND

130K

VREFOUT

47.5K

0.47µF

1.5K 32.4K

4.42K

NETW2NETW1

CENTER

1K

15 16

REF

V

SRS

17

-

SUPPLY

MONO

SRS

+

MIX

+

+

+

MIX

-

PHASE SHIFTER 1

PHASE SHIFTER 2

+

FIX

LP1 LP2

LPF1

1µF 0.1µF

HP6

0.1µF
HP5

HPF2

27nF 4.7nF 0.47nF

2.2nF

15nF

100nF

HP4

HP3

HP2

HP1

PS2 PS3

PS1

PS6

PS5

PS4

23

22 24

HPF1

19

18 20

12 13 14 9 10 11 25 26

1µF

0.1µF

1µF

2/11

31.5dB control

0.15µF

S

V

21 8 27

31.5dB

control

50K

3

L-IN

50K

2

R-IN

0.15µF

TDA7467

THERMAL DATA

Symbol Description Value Unit

R

thj-pins

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

T

amb

T

QUICK REFERENCEDATA

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 °C
Storage Temperature Range -55 to +150 °C

stg

Supply Voltage 7 9 10.2 V

S

CL

Max. input signal handling 2 Vrms

= 1Vrms (mode = OFF) 106 dB

out

Channel Separation f = 1KHz 90 dB

C

Input Control (0.5dB) -31.5 0 dB
SRS Center Control(1dB step) -31 0 dB
SRS Space Control(1dB step) -31 0 dB
Mute Attenuation 100 dB

ELECTRICALCHARACTERISTICS (referto the test circuit T
V

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

in

=25°C, VS= 9V, RL= 10KΩ,

amb

unless otherwisespecified)

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

A

A

A

R

IN

V

CL

VMIN

VMAX

STEP

V

DC

Input Resistance 37.5 50 62.5 K
Clipping Level THD = 0.3% 2 2.5 Vrms
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

SRS EFFECT CONTROL

C

range1

Sstep1 Center/SpaceStep Resolution 1 dB

Center/Space Control Range -31 0 dB

Ω

3/11

TDA7467

ELECTRICALCHARACTERISTICS (continued)

Symbol Parameter Test Condition Min. Typ. Max. Unit

AUDIO OUTPUTS

N

N

o(Off)

o(srs)

Output Noise(OFF) Output muted, Flat

BW (20Hz to 20KHz)

Output noise(srs)

BW (20Hz to 20KHz) 50 µVrms

4
5

Surround Sound

d Distortion A

S

C

V

ocl

R

out

V

out

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

=0;Vin= 1Vrms 0.01 0.1 %

V

BUS INPUTS

V

il

V

ih

I

in

V

o

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

IO=1.6mA 0.4 V

Acknowledge

SRS SURROUNDSOUND 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=0dB

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

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

= GND; Li

in

Perspective 2 Input Signal of 2.15KHz

n →ROUT

0dB
SPACE= 0dB,CENTER= MUTE
R

= GND; Li

in

n →ROUT

-8.5 dB

R

in = GND; Lin → ROUT

-13.4 dB

R

= GND; Li

in

Lin= GND; Rin→ R

n →LOUT

OUT

Vrms

µ
µVrms

4/11

TDA7467

I2C BUSINTERFACE
Data transmission from microprocessor to the

TDA7467 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 must be 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 and Stop 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 LOW to HIGH tran­sition of the SDA line while SCLis HIGH.

Byte Format

Every byte transferred on the SDA line must con­tain 8 bits. Each byte must be followed by an ac-

2

Figure 3: DataValidityon theI

CBUS

knowledgebit. The MSBis transferredfirst.

Acknowledge

The master (µP)puts a resistiveHIGHlevelon the
SDA line during the acknowledgeclock pulse (see
fig. 5). The peripheral (audioprocessor) that ac­knowledges has to pull-down (LOW) the SDA line
duringthisclockpulse.

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.

Transmissionwithout Acknowledge

Avoiding to detect the acknowledge of the audio­processor,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

5/11

TDA7467

SOFTWARESPECIFICATION

InterfaceProtocol
The interfaceprotocol comprises:

A startcondition (S)

CHIP ADDRESS SUBADDRESS DATA1to DATAn

MSB LSB MSB LSB MSB LSB

S100000A0ACKB DATA ACK DATA ACKP

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

ACK = Achnowledge
S = Start
P = Stop
B = Auto Increment

EXAMPLES
No IncrementalBus

The TDA7467receives a start condition,the correctchip address, a subaddresswith the MSB= 0 (no in­crementalbus), N-data (all these data concernthe subaddressselected), a stopcondition.

CHIP ADDRESS SUBADDRESS DATA

MSB LSB MSB LSB MSB LSB

S 1 0 0 0 0 0 A 0 ACK 0 X X X X X D1 D0 ACK DATA ACK P

Incremental Bus

The TDA7467receives a start condition,the correctchip address, a subaddresswith the MSB= 1 (incre­mental bus): now it is in a loop condition with an autoincrease of the subaddress whereas SUBAD­DRESS from ”1XXXX1XX”to ”1XXX1111”of DATAare ignored.
The DATA 1 concerns the subaddress sent, and the DATA 2 concerns the subaddress plus one sent in
the loop etc. and at the end, it receivesthe stop condition.

CHIP ADDRESS SUBADDRESS DATA 1to DATAn

MSB LSB MSB LSB MSB LSB

S 1 0 0 0 0 0 A 0 ACK 1 X X X X X D1 D0 ACK DATA ACK P

6/11

TDA7467

DATA BYTES(Address= 80(HEX) ifADDR pin is floating,82(HEX) if ADDRpin is connectedto V
FUNCTIONSELECTION:

The first byte (subaddress)

MSB LSB SUBADDRESS

D7 D6 D5 D4 D3 D2 D1 D0

B X X X X X 0 0 MODE
B X X X X X 0 1 SRS/SPACEATTENUATION
B X X X X X 1 0 SRS/CENTERATTENUATION
B X X X X X 1 1 INPUT ATTENUATION

B = 1: INCREMENTAL BUS; ACTIVE
B = 0: NO INCREMENTAL BUS
X = INDIFFERENT 0, 1

INPUT ATTENUATION SELECTION

MSB LSB INPUT ATTENUATION

D7 D6 D5 D4 D3 D2 D1 D0 0.5 dB STEPS

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

4 dB STEPS

0000 0
0001 -4
0010 -8
0011 -12
0100 -16
0101 -20
0110 -24
0111 -28
1 MUTE

):

S

INPUT ATTENUATION = 0 ∼ -31.5dB

SRS MODE

D7 D6 D5 D4 D3 D2 D1 D0 MODE

X 0 SRSOFF (FIX)
X 1 SRSON

0 1 MONO SRS (MONO 3D)
1 1 STEREO SRS (STEREO 3D)

RECOMMENDED TO ATTENUATE -3dB ON ”SRS OFF”
ie. MONO SRS (MONO 3D): XXXXXX01

7/11

TDA7467

SPACE & CENTER ATTENUATION SELECTION

MSB LSB SPACE & CENTER 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

000 0
001 -8
010 -16
011 -24
1XXXXX MUTE

X = INDIFFERENT 0, 1
SPACE & CENTER ATTENUATION = 0dB

POWERON RESET

-31dB

∼

INPUT MUTE
MODE OFF (FIX)

SPACE ATTENUATION MUTE (MIN)

CENTER ATTENUATION MUTR (MIN)

8/11

DIP28 PACKAGE MECHANICAL DATA

TDA7467

DIM.

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

a1 0.63 0.025

b 0.45 0.018

b1 0.23 0.31 0.009 0.012

b2 1.27 0.050

D 37.34 1.470

E 15.2 16.68 0.598 0.657

e 2.54 0.100

e3 33.02 1.300

F 14.1 0.555

I 4.445 0.175

L 3.3 0.130

mm inch

9/11

TDA7467

SO28 PACKAGEMECHANICAL DATA

DIM.

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

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

mm inch

S8°(max.)

10/11

TDA7467

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the
consequences of useof 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 patentrights of SGS-THOMSONMicroelectronics. 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 criticalcomponentsin lifesupport devices or systems withoutexpress
written approval of SGS-THOMSON Microelectronics.

 1997 SGS-THOMSON Microelectronics– Printedin Italy– AllRightsReserved

The SoundRetrieval System and are registered trademarks ofSRS Labs,Inc.

SGS-THOMSON Microelectronics GROUP OF COMPANIES

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11/11