SGS Thomson Microelectronics TDA7346D, TDA7346 Datasheet

DIGITAL CONTROLLED SURROUNDSOUND MATRIX

1 STEREOINPUT
THREEINDEPENDENT SURROUND MODES

ARE AVAILABLE MOVIE, MUSIC AND SIMU­LATED

- MUSIC:4 SELECTABLERESPONSES

- MOVIE ANDSIMULATED:
256SELECTABLERESPONSES

TWO INDEPENDENT INPUT ATTENUATORS
IN 0.31dB FORBALANCEFACILITY

ALL FUNCTIONS PROGRAMMABLE VIA SE­RIAL BUS

SO20

TDA7346

DIP20

DESCRIPTION

The TDA7346 reproduces surround sound by us­ing phase shifters and a signal matrix. Control of
all the functionsis accomplishedby serial bus.
The AC signal setting is obtained by resistor net-

BLOCK DIAGRAM

5.6nF 680nF

LP1

HP1 HP2

100nF

100nF

L

-in
100K

R

-in
100K

RLP1 RHP1

+

R5

-

+

R6

SUPPLY

­+

­+

L-R

SIM

MOVIE/
MUSIC

ORDERING NUMBER: TDA7346 (DIP20)

TDA7346D (SO20)

works and switches combined with operational
amplifiers.

100nF

PS1

RPS1

PS1

90Hz

LPF

9KHz

4.7nF

PS2

RPS2 RPS3 RPS4

PS2

4KHz

MUSIC

OFF

EFFECT

CONTROL

22nF

PS3

PS3

400Hz

PHASESHIFTER

MOVIE/SIM

22nF

PS4

PS4

400Hz

MIXING

AMP

MIXING

AMP

I2C

BUS

DECODER

LATCHES

L

out

SCL
SDA

DIG GND

ADDR

REAR

R

out

February 1997

VSAGND CREF LP

C5

22µF

1.2nF

D94AU122A

1/14

TDA7346

ABSOLUTE MAXIMUMRATINGS

Symbol Parameter Value Unit

V

T

T

PIN CONNECTION

Operating Supply Voltage 10.5 V

S

Operating Ambient Temperature -40 to 85 °C

amb

Storage Temperature Range -55 to +150 °C

stg

PS1

V

CREF

L

-in

LP

REAR

L

out

SDA

SCL

1
2

S

3
4
5
6
7
8
9 ADDR

19
18
17
16
15
14
13
12

PS220
LP1
HP1
HP2
R

-in

PS3
PS4
R

out

DIG GND 10 AGND11

D94AU128

THERMAL DATA

Symbol Description Value Unit

R

thj-pins

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

QUICK REFERENCEDATA

Symbol Parameter Min. Typ. Max. Unit

V

V

CL

THD Total Harmonic Distortion V = 1Vrms f = 1KHz 0.02 0.1 %

S/N Signal to Noise Ratio V

S

2/14

Supply Voltage 7 9 10.2 V

S

Max. input signal handling 2 Vrms

out = 1Vrms (mode = OFF) 106 dB

Channel Separation f= 1KHz 70 dB

C

TEST CIRCUIT

TDA7346

L

out

SCL

SDA

680nF

HP1

18

REAR

6798

C16

17

L

-in
4

0.1µF

C17

V

HP2

S

10µFC1

2

TDA7346

100nF

C2

PS3

22nF

15

C4

PS4

22nF

C5

ELECTRICALCHARACTERISTICS

R

= 600Ω, all controls flat (G = 0),EffectCtrl = -6dB, MODE = OFF; f = 1KHz

G

14

R

out

AGND DIG GND

(refer to the test circuitT

12101113

ADDR

=25°C, VS= 9V, RL= 10KΩ,

amb

unless otherwisespecified)

LP

5

R

16

LP1

19

PS1

1

PS2

20

CREF

3

D93AU040C

1.2nF
C6

0.1µF

-in
C7

5.6nF
C15

100nF

C14

4.7nF
C13

22µF

C3

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 10 mA

CH/RCH out

, Mode = OFF 60 80 dB

INPUT STAGE

C

RANGE

A

A

A

V

R

II

V

CL

VMIN

VMAX

STEP

DC

Input Resistance 100 K
Clipping Level THD = 0.3%; Lin orRin 2 2.5 Vrms

THD = 0.3%; Rin + Lin (2) 3.0 Vrms
Control Range 20 dB
Min. Attenuation -1 0 1 dB
Max. Attenuation 20 dB
Step Resolution 0.31 dB
DC Steps adjacent att.step 0 mV

EFFECT CONTROL

C

RANGE

S

STEP

Control Range - 21 - 6 dB
Step Resolution 1 dB

Ω

3/14

TDA7346

ELECTRICAL CHARACTERISTICS

(continued)

SURROUNDSOUND MATRIX

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

MOV1

In-phase Gain (Movie 1)
RPS1, RPS2, RPS3, RPS4 =
POR Preset

G

MOV2

In-phase Gain (Movie 2)
RPS1, RPS2, RPS3, RPS4 =
POR Preset

D

GMOV

LR In-phase Gain Difference
(Movie)

G

MUS1

In-phase Gain (Music 1)
RPS1 = POR PRESET

G

MUS2

In-phase Gain (Music 2)
RPS1 = POR PRESET

D

GMUS

LR In-phase Gain Difference
(Music)

L

MON1

Simulated L Output 1
RPS1, RPS2, RPS3, RPS4 =
POR Preset

L

MON2

Simulated L Output 2
RPS1, RPS2, RPS3, RPS4 =
POR Preset

L

MON3

Simulated L Output 3
RPS1, RPS2, RPS3, RPS4 =
POR Preset

R

MON1

Simulated R Output 1
RPS1, RPS2, RPS3, RPS4 =
POR Preset

R

MON2

Simulated R Output 2
RPS1, RPS2, RPS3, RPS4 =
POR Preset

R

MON3

Simulated R Output 3
RPS1, RPS2, RPS3, RPS4 =
POR Preset

R

LP1

R

PS1

R

PS2

R

PS3

R

PS2

R

HPI

R

LPF

Low Pass Filter Resistance 10 KΩ
Phase Shifter 1 Resistance at POR 17.95 kΩ
Phase Shifter 2 Resistance at POR 8.465 K
Phase Shifter 3 Resistance at POR 18.050 K
Phase Shifter 4 Resistance at POR 18.050 KΩ
High Pass Filter Resistance 60 KΩ
LP Pin Impedance 10 KΩ

1kHz, 1.4 V

L

L

→

in

out

p-p,Rin

→ R

out

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

in

→

p-p

R

), (L

out

L

)

→

in

out

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

out,Lin

→ L

p-p

out

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

out,Lin

→ L

p-p

out

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

R

(R

in

→

out

)–(L

→

in

p-p

L

)

out

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

R

(R

in

→

out

)–(L

→

in

p-p

L

)

out

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

out,Lin

→ L

p-p

out

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

)–(Lin→ L

out

out

p-p

)

SimulatedMode,EffectCtrl=-6dB
Input signal of 250Hz,

1.4 V

p-p,Rin

and Lin→ L

out

SimulatedMode,EffectCtrl=-6dB
Input signal of 1kHz,

1.4 V

p-p,Rin

and L

L

→

in

out

SimulatedMode, EffectCtrl= ­6dB
Input signal of 3.6kHz,

1.4 V

p-p,Rin

and L

L

→

in

out

SimulatedMode,EffectCtrl=-6dB
Input signal of 250Hz,

1.4 V

p-p,Rin

and L

R

→

in

out

SimulatedMode,EffectCtrl=-6dB
Input signal of 1kHz,

1.4 V

p-p,Rin

and Lin→R

out

SimulatedMode,EffectCtrl=-6dB
Input signal of 3.6kHz,

1.4 V

p-p,Rin

and Lin→ R

out

-1.5 0 1.5 dB

-1.5 0 1.5 dB

7dB

8dB

0dB

6dB

7.5 dB

0dB

4.5 dB

– 4.0 dB

7.0 dB

– 4.5 dB

3.8 dB

–20 dB

Ω
Ω

4/14

TDA7346

ELECTRICAL CHARACTERISTICS

(continued)

Symbol Parameter Test Condition Min. Typ. Max. Unit

AUDIO OUTPUTS

V

OCL

R

OUT

V

OUT

Clipping Level d = 0.3% 2 2.5 Vrms
Output resistance 100 200 300 Ω
DC Voltage Level 3.5 3.8 4.1 V

GENERAL

N

O(OFF)

N

O(MOV)

N

O(MUS)

N

O(MON)

d Distorsion Av = 0 ; V

S

C

Output Noise (OFF) BW= 20Hz to 20KHz

R

out

and L

measurement

out

Output Noise (Movie) Mode =Movie ,

B

= 20Hz to 20KHz

W

R

out

andL

measurement

out

Output Noise (Music) Mode = Music ,

B

= 20Hz to 20KHz,

W

R

out

andL

measurement

out

Output Noise (Simulated) Mode = Simulated,

B

= 20Hz to 20KHz

W

R

out

andL

measurement

out

= 1Vrms 0.02 0.1 %

in

8 µVrms

30

30 µVrms

30 µVrms

Channel Separation 70 dB

BUS INPUTS

V

IL

V

IH

I

IN

V

O

Note:
(1) Bassand Treble response: The center frequency and the resonance quality can be choosen by

the external circuitry. A standard first order bass response can be realized by a standard feedback network.

(2) Thepeak voltage of thetwo input signals must be less then

(Lin + Rin)

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

IO= 1.6mA 0.4 0.8 V

Acknowledge

V

S

:

2

peak

• A

V

S

<

Vin

2

Vrms

µ

µ

A

5/14

TDA7346

2

C BUS INTERFACE

I
Data transmission from microprocessor to the

TDA7346 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
supplyvoltage mustbe connected).

Data Validity

As shown in fig. 3, the data on the SDAline must
be stable during the high period of the clock. 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 SDAline while SCL is HIGH.

Byte Format

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

Figure 3:

Data Validityon theI

2

CBUS

knowledgebit. The MSBis transferredfirst.

Acknowledge

The master (µP) putsa resistiveHIGH level 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
during the acknowledge clock pulse, so that the
SDAlineis stableLOWduringthisclockpulse.

The audioprocessor which has been addressed
has to generate an acknowledge after the recep­tion of each byte, otherwisethe 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.

TransmissionwithoutAcknowledge

Avoiding to detect the acknowledge of the audio­processor,the µP can usea simplertransmission:
simply it waits one clock without checking the
slave acknowledging,and sends the new data.

This approach of course is less protected from
misworking and decreasesthe noise immunity.

Figure 4:

TimingDiagram of I

2

Figure 5: Acknowledgeon theI

6/14

CBUS

2

CBUS

TDA7346

SOFTWARESPECIFICATION

InterfaceProtocol
The interfaceprotocol comprises:

A startcondition (s)
A chip address byte, containing the TDA7346

TDA7346 ADDRESS

MSB

S110111A0

ACK = Acknowledge
S = Start
P = Stop

MAX CLOCK SPEED 100kbits/s

first byte

LSB MSB LSB MSB LSB

ACK

SOFTWARESPECIFICATION

Chip address

1

MSB

10111A0

address(the 8th bit of the byte must be 0). The
TDA7346must always acknowledgeat the end
of each transmitted byte.

A sequenceof data (N bytes + achnowledge).
A stopcondition (P)

DATA

Data Transferred (N-bytes + Acknowledge)

LSB

ACK

A CHIP ADDRESS

0 DC (HEX)
1 DE (HEX)

DATA

ACK

P

A = Logic level on pin ADDR

A = 1 if ADDR pin = open
A = 0 if ADDR pin = connected to ground

SoftwareSpecification

MSB LSB SUBADDRESS

0 0 A5 A4 A3 A2 A1 A0 INPUT ATTENUATION R
0 1 A5 A4 A3 A2 A1 A0 INPUT ATTENUATION L
1 M1 M0 SURROUND MODES
1 0 0 SIMULATED MODE
1 0 1 MUSIC MODE
1 1 0 MOVIE MODE
11111111OFFMODE
1 M1 M0 1 B3 B2 B1 B0 EFFECT CONTROL
1 M1 M0 0 0 0 C1 C0 PHASE SHIFTER 4 CONTROL
1 M1 M0 0 0 1 C1 C0 PHASE SHIFTER 3 CONTROL
1 M1 M0 0 1 0 D1 D0 PHASE SHIFTER 2 CONTROL
1 M1 M0 0 1 1 E1 E0 PHASE SHIFTER 1 CONTROL

7/14

TDA7346

INPUT ATTENUATION

MSB LSB 0.3125 dB STEPS

I A5A4A3A2A1A0
0 000 0
0 0 0 1 -0.3125
0 0 1 0 -0.625
0 0 1 1 -0.9375
0 1 0 0 -1.25
0 1 0 1 -1.5625
0 1 1 0 -1.875
0 1 1 1 -2.1875

2.5 dB STEPS

0 000 0
0 0 0 1 -2.5
0 010 -5
0 0 1 1 -7.5
0 100 -10
0 1 0 1 -12.5
0 110 -15
0 1 1 1 -17.5

I = 0 AttenuationInput R
I = 1 AttenuationInput L
Example: to program an R input attenuationequal to -11.25 you have to send 00100100

EFFECT CONTROL (-6 / -21dB)

MSB LSB 1dB STEPS

B3 B2 B1 B0
1M1M010000 -6
1M1M010001 -7
1M1M010010 -8
1M1M010011 -9
1M1M010100 -10
1M1M010101 -11
1M1M010110 -12
1M1M010111 -13
1M1M011000 -14
1M1M011001 -15
1M1M011010 -16
1M1M011011 -17
1M1M011100 -18
1M1M011101 -19
1M1M011110 -20
1M1M011111 -21

8/14

TDA7346

PHASE SHIFTER 3, 4

MSB LSB RESISTOR VALUE (KΩ)

C1 C0
1 M1 M0 0 0 F 0 0 12.060
1 M1 M0 0 0 F 0 1 14.450
1 M1 M0 0 0 F 1 0 18.050
1 M1 M0 0 0 F 1 1 39.100

F = 0 Phase Shifter4
F = 1 Phase Shifter3

PHASE SHIFTER 2

MSB LSB RESISTOR VALUE (KΩ)

D1 D0
1M1M001000 5.640
1M1M001001 6.770
1M1M001010 8.465
1M1M001011 18.300

PHASE SHIFTER 1

MSB LSB RESISTOR VALUE (KΩ)

E1 E0
1M1M001100 11.745
1M1M001101 14.150
1M1M001110 17.950
1M1M001111 37.625

Example: to program MOVIE MODE with EFFECT control = -7dB with PHASE SHIFTER resistor =

11.745KΩ, PHASE SHIFTER 2 resistor = 6.77KΩ,
SHIFTER4 resistor= 18.05KΩ,you haveto send in sequence5 bytes:

11010001
11001100
11001001
11000100
11000010

PHASE SHIFTER 3 resistor = 12.06KΩ, PHASE

POWER ON RESET

INPUT ATTENUATION -19.375dB
EFFECT CONTROL -20dB
SURROUND MODE OFF MODE
PHASE SHIFTER 1 RESISTOR VALUE 17.950 K
PHASE SHIFTER 2 RESISTOR VALUE 8.465 K
PHASE SHIFTER 3, 4 RESISTOR VALUE 18.050 K

Ω

Ω

Ω

9/14

TDA7346

PIN:

HP1

LP1

HP2

PIN: Lin,R

PIN:

HP2

V

, R

V

S

20µA

5.5K

60K

D94AU199

, REAR

OUT

S

5.5K

20µA

V

S

10K

60K

GND

D94AU198

in

V

S

HP1

PIN: L

OUT

20µA

PIN:

SCL, SDA

Vref

100K

D94AU123

20µA

D94AU205

PIN:

ADDR

100Ω

V

S

100K

D94AU204

20µA

D94AU212

10/14

TDA7346

PIN:

PIN: C

LP

REF

V

S

D94AU206

V

S

10K

20µA

PIN:

PS3, PS2

PIN: PS2

PS3A
PS4A

V

S

20µA

18.050K

D94AU124

V

S

20µA

PIN:

PS1

PS1A

20K

20K

V

S

20µA

D94AU208

20µA

PIN:

LP1

PS2A

8.465K

D94AU125

V

S

20µA

17.95K

10K

HP1

D94AU126

D94AU211

11/14

TDA7346

SO20 PACKAGEMECHANICAL DATA

DIM.

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

A 2.65 0.104
a1 0.1 0.3 0.004 0.012
a2 2.45 0.096

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 12.6 13.0 0.496 0.512

E 10 10.65 0.394 0.419

e 1.27 0.050
e3 11.43 0.450

F 7.4 7.6 0.291 0.299

L 0.5 1.27 0.020 0.050

M 0.75 0.030

mm inch

S8

(max.)

°

12/14

DIP20 PACKAGE MECHANICAL DATA

TDA7346

DIM.

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

a1 0.254 0.010

B 1.39 1.65 0.055 0.065

b 0.45 0.018

b1 0.25 0.010

D 25.4 1.000

E 8.5 0.335

e 2.54 0.100

e3 22.86 0.900

F 7.1 0.280

I 3.93 0.155

L 3.3 0.130

mm inch

Z 1.34 0.053

13/14

TDA7346

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 implication or 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. SGS­THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express
written approval of SGS-THOMSON Microelectronics.

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

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