SGS Thomson Microelectronics TDA7494 Datasheet

TDA7494

10W AMPLIFIER WITH DC VOLUME CONTROL

10W OUTPUT POWER RL = 8Ω,
@ THD = 10% V

CC

= 28V
ST-BY AND MUTE FUNCTIONS
LINEAR VOLUME CONTROL DC COUPLED

WITH POWER OP AMPLIFIER
NO BOUCHEROT CELL
NO ST-BY RC INPUT NETWORK
SIGNAL LINE OUTPUT BEFORE VOLUME

CONTROLLING AND MUTING
3 SWITCHABLE VOLTAGE CONTROLLED

INPUT PINS
SINGLE SUPPLY RANGING UP TO 35V
SHORT CIRCUIT PROTECTION
THERMAL OVERLOAD PROTECTION
INTERNALLY FIXED GAIN
SOFT CLIPPING
LOW TURN-ON TURN-OFF POP NOIS E
MULTIWATT 15 PACKAGE

BLOCK AND APPLICATION DIAGRAM

MULTIPOWER BI50II TECHNOLOGY

Multiwatt15

ORDERING NUMBER:

DESCRIPTION

The TDA7494 10W is class AB power amplifier
assembled in the @Multiwatt 15 package, spe­cially designed for high quality sound, TV applica­tions.

Features of the TDA7494 include volume control,
3 switchable inputs, Stand-by and mute functions.

TDA7494

3 x

470nF
IN 1
IN 2
IN 3

PWR GND

SGN GND

February 1997

5
6
1

15

8

D95AU414D

100K

2

SW CTL

SW

1

3

243 7910

MONITOR

OUT

100K

300nF

VOL PWR

2K

VOL CTL

300nF

SVR

MUTE/STBY

PROTECTIONS

STAND-BY

470µF

10K 1µF

13 +V

14

MUTE

CC

470µF

OUT

1/12

TDA7494

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

S

V

IN

P

tot

T

amb

, T

T

stg

, V

V

2

(1) Operation between -20 to 85 °C guaranteed by correlation with 0 to 70°C.

PIN CONNECTION

DC Supply Voltage 35 V
Maximum Input Voltage 8 Vpp
Total Power Dissipation (Tamb = 70°C) 16 W
Ambient Operating Temperature Range (1) -20 to +85 °C
Storage and Junction Temperature -40 to 150 °C

j

Volume CTRL DC voltage 7 V

3

D95AU415A

PWR GND
OUT
+V

CC

N.C.
N.C.
MUTE
STAND-BY
SGN GND
SVR
IN 2
IN 1
MONITOR OUT
VOLUME CONTROL
SW CTL
IN 3

15
14
13
12
11
10

9
8
7
6
5
4
3
2
1

THERMAL DATA

Symbol Parameter Value Unit

R

th j-case

R

th j-amb

ELECTRICAL CHARACTERISTICS

= 25°C; unless otherwise specified.)

T

amb

Symbol Parameter Test Condition Min. Typ. Max. Unit

V

S

I

q

DCV

OS

V

O

P

O

Thermal Resistance Junction-case Typ = 3.8 Max = 4.8 °C/W
Thermal Resistance Junction-ambient max 35 °C/W

(Refer to the test circuit, V

= 21V, RL = 8Ω; Rg = 50Ω;

S

Supply Voltage Range 11 35 V
Total Quiescent Current 22 50 mA
Output DC Offset Referred to

No Input Signal -400 400 mV

SVR Potential
Quiescent Output Voltage VS = 28V 14 V
Output Power THD = 10%; VCC = 28V, RL = 8Ω

THD = 1%; V

CC

= 28V

THD = 10%; VCC = 21V,
THD = 1%; V

THD = 10%; V
THD = 1%; V

= 21V,

CC

= 21V, RL = 4Ω

CC

= 21V,

CC

THD = 10%; VCC = 18V,
THD = 1%; V

THD = 10%; V
THD = 1%; V

= 18V

CC

= 18V, RL = 8Ω

CC

= 18V

CC

8
6

5

3.5
5

3.9

4.5

3.5

3.5

2.5

10

8

5.5
4

7.5

5.5
6

4.5

3.75

2.85

W

W

W

W
W

W

2/12

TDA7494

ELECTRICAL CHARACTERISTICS

(continued)

Symbol Parameter Test Condition Min. Typ. Max. Unit

THD Total Harmonic Distortion P

I

G

A

MinVol

peak

T

V
G

vLine

op

in

V

Output Peak Current (internally limited) 1.4 1.9 A
Operating Temperature 0 70 °C
Input Signal 2.8 Vrms
Closed Loop Gain Vol Ctrl > 4.5V 24.5 26 27.5 dB
Monitor Out Gain R
Attenuation at Min Volume Vol Ctrl < 0.5V 80 dB

= 1W; f = 1KHz; Gv = 26dB 0.4 %

O

LOAD Mon

= ∞ -3 -1.5 0 dB

BW 0.6 MHz

e

N

Total Output Noise f = 20Hz to 22KHz

350 700 µV

Play, max volume
f = 20Hz to 22KHz

60 100 µV

Play, max attenuation
f = 20Hz to 22KHz

30 50 µV

Mute

SR Slew Rate 5 8 V/µs

R

i

R

Mon

R

load Mon

SVR Supply Voltage Rejection f = 1kHz; max volume

T

M

T

s

V

ST-BY

V

MUTE

Input Resistance 22.5 30 KΩ
Monitor Output Resistance 1.4 2 3 KΩ
Monitor Output Load 30 KΩ

36 43 dB

C

= 470µA; V

SVR

f = 1kHz; max attenuation
C

= 470µA; V

SVR

RIP

RIP

= 1V

= 1V

RMS

60 73 dB

RMS

Thermal Muting 150 °C
Thermal Shut-down 160 °C
Stand-by threshold 2.3 2.5 2.7 V

Mute Threshold 2.3 2.5 2.7 V
Sel #1 Control Voltage Input #1 selected 0 1 V
Sel #2 Control Voltage Input #2 selected 2.3 2.7 V
Sel #3 Control Voltage Input #3 selected 4 5 V
I

qST-BY

A

MUTE

I

stbyBIAS

Quiescent Current @ Stand-by 0.6 1 mA

Mute Attenuation 60 75 dB

Stand-by bias current Stand by on; V

V

= 5V;

MUTE

ST-BY

= 5V;

80 150 µA

Play or Mute 2 20 µA

I

muteBIAS

Mute bias current Mute 1.5 10 µA

Play 0.5 5 µA

I

switchBIAS

Switch bias current Input #1 selected -0.5 5 µA

Input #2 selected 1 10 µA
Input #3 selected 1.5 20 µA

3/12

TDA7494

Figure 1:

+5V

R1

3.3K

R2

3.3K

Figure 2:

Test and Application Circuit.

MONITOR

OUT

213

IN 1

IN 2

IN 3

C3 470nF

C4 470nF

C5 470nF

S1

4

JMP1

TP1

4

5
6
1

R3 100K

300nF

C6

SGN GND

P.C.B. and component layout.

13 +V

SW

1

2

3

82

+5V
VOL

P1

50K

LOG

R4

100K

5K

VOL PWR

TP2

C10 470µF

14

MUTE/STBY

PROTECTIONS

37910

SVR

C7

300nF

C8

470µF

STAND-

BY

R5

10K

S3S2

15

MUTE

GND

C9

1µF

+5V
+5V

D96AU492B

C2

0.1µF

OUT
PGND

C1

1000µF

GND

CC

4/12

TDA7494

APPLICATION SUGGES TION S

The recommended values of t he external components are those shown on t he application circuit of fig­ure 1. Different values can be used; the following table can help the designer.

COMPONENT

R1 3.3KΩ Input switch circuit Vpin #2 shifted downward Vpin #2 shifted upward
R2 3.3KΩ Input switch circuit Vpin #2 shifted upward Vpin #2 shifted downward

R3 100KΩ

R4 100KΩ
R5 10KΩ Mute time constant Larger mute on/off time Smaller mute on/off time

P1 50KΩ Volume control circuit
C1 1000µF Supply voltage bypass Danger of oscillation
C2 100nF Supply voltage bypass Danger of oscillation

C3 470nF Input DC decoupling

C4 470nF Input DC decoupling

C5 470nF Input DC decoupling

C6 300nF

C7 300nF
C8 470µF Ripple Rejection Better SVR Worse SVR

C9 1µF Mute time constant Larger mute on/off time Smaller mute on/off time

C10 470µF Output DC decoupling

SUGGESTION

VALUE

PURPOSE

Input switch time
constant

Volume control time
constant

Input- switch time
constant

Volume control time
constant

LARGER THAN

SUGGESTION

Larger Input Switch Time Smaller input switch time
Larger Volume

Regulation Time

Lower low frequency
cutoff

Lower low frequency
cutoff

Lower low frequency
cutoff

Larger-Input- switch time Smaller input- switch time
Larger volume regulation

time

Lower low frequency
cutoff

SMALLER THAN

SUGGESTION

Smaller volume
regulation time

Higher low frequency
cutoff

Higher low frequency
cutoff

Higher low frequency
cutoff

Smaller volume regulation
time

Higher low frequency
cutoff

TYPICAL CHARACTERISTICS:

Refer to the Application Circuit of Fig.1 V

RS = 8Ω; Tamb = 25°C; RS = 50Ω; unless otherwise specified

Figure 3:

P

Output Power vs Supply Voltage

OUT

(W)

14
12
10

8
6
4
2
0

5 10 15 20 25 30 Vs(V)

d=10%

D96AU517

d=1%

Figure 4:

d

(%)

1

0.1

0.01

= 21V; RL = 8Ω; f = 1KHz;

S

Distortion vs Output Power

D96AU518

VS=28V
R

=8Ω

L

f=15KHz

f=1KHz

02468P

OUT

(W)

5/12

TDA7494

Figure 5:

P

OUT

(W)

7
6
5
4
3
2
1
0

11 13 15 17 19 VS(V)

Figure 7:

d

(%)

1

Output Power vs Supply Voltage

D96AU519

RL=4Ω

d=10%

d=1%

Distortion vs Frequency

D96AU521

P

=1W

OUT

R

=8Ω

L

Figure 6:

d

(%)

1

0.1

0.01
0246P

Figure 8:

d

(%)

1

Distortion vs Output Power

VS=21V

=4Ω

R

L

f=15KHz

f=1KHz

Distortion vs Frequency

P

=1W

OUT

=4Ω

R

L

D96AU520

OUT

D96AU522

(W)

0.1

0.01
20

Figure 9:

I

Q

(mA)

28

26

24

22

20

18

16

10 14 18 22 26 30 VS(V)

100

1K

f(Hz)

Quiescent Current vs Supply Voltage

D96AU523

0.1

0.01
20

Figure 10:

V

DDC

(V)

15

13

11

9

7

5

10 14 18 22 26 30 VS(V)

100

1K

f(Hz)

Quiescent Output Voltage vs Supply

Voltage

D96AU524

6/12

TDA7494

Figure 11:

Gain vs Volume Control (pin #3)

Gain
(dB)

20
10

0

-10

P

OUT

=1W

-20

-30

-40

-50

-60

-70

-80

-90

0.0 1.0 2.0 3.0 4.0 Vpin#3(V)

Figure 13:

ATT
(dB)

-20

-40

Stand-by Attenuation vs Vpin # 9

0

0dB=1W

D96AU525

D96AU527

Figure 12:

Supply Voltage Rejection vs Fre-

quency

SVR
(dB)

V

=1V

RIP

-20

-40

-60

-80

-100
20 100 1K f(Hz)

Figure 14:

ATT
(dB)

0

-20

MAX VOLUME

MAX ATTENUATION

Mute Atttenuation vs Vpin # 10

RMS

0dB=1W

D96AU526

D96AU528

-60

-80

-100

-120

-140
0 1 2 3 4 Vpin#9(V)

Figure 15:

P

DISS

(W)

8

6

4

2

Power Dissipation vs Output Power

D96AU529

RL=8Ω

VS=35V

VS=28V

VS=21V

-40

-60

-80

-100
01234Vpin#10(V)

Figure 16:

P

DISS
(W)

8

6

4

2

Power Dissipation vs Output Power

D96AU530

RL=4Ω

VS=21V

VS=18V

0

0.1 1 10 P

OUT

(W)

0

0.1 1 10 P

OUT

(W)

7/12

TDA7494

MUTE STAND-BY TRUTH TABLE

MUTE ST-BY OPERATING CONDITION

H H STANDBY

L H STANDBY

H L MUTE

L L PLAY

Turn ON/OFF Sequences (for optimising the POP performances)

A) USING MUTE AND STAND-BY FUNCTION S

(V)

V

S

28

ST-BY

pin#9 (V)

5

V

SVR

pin#7(V)

2.5V

MUTE

pin#10 (V)

5

INPUT

(mV)

V

OUT
(V)

I

Q

(mA)

B) USING ONLY THE MUTE FUNCTI ON
To semplify the application, the stand-by pin can

be connected directly to Ground.
During the ON/OFF tr ansitions we recommend to

respect the following conditions:

OFFSTBY MUTE PLAY STBYOFF MUTE

D96AU531A

- At the turn-on the transition mute to play must
be made when the SVR pin is higher than

2.5V

- At the turn-off the TDA7494 must be brought
to mute from the play condition when the SVR
pin is higher than 2.5V.

8/12

TDA7494

PINS:

IN3, IN1, IN2

PIN:

VOLUME

INn

SVR

D97AU581

VOL

30K

10µA

D97AU591

V

V

S

S

100µA

PIN:

SWITCH

PIN:

MONITOR

SWITCH

D97AU582

BUFFER

2K

V

S

10µA

MONITOR

V

S

10µA

D97AU584

PIN:

SVR

SVR

1mA

V

V

S

S

V

S

V

S

+

OUT L

-

20K

20K

6K

6K

1K

1K

30K

30K

-

OUT R

+

100µA

D97AU585

9/12

TDA7494

PIN:

ST-BY

PIN:

MUTE

PIN:

OUT

STBY

D97AU588

200

10µA

D97AU586

V

OUT

V

S

300MUTE

10K

V

S

50µA

D97AU587

PINS:

PW-GND , S-G ND

S

V

S

GND

D97AU593

10/12

MULTIWATT15 PACKAGE MECHANICAL DATA

TDA7494

DIM.

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

A 5 0.197

B 2.65 0.104
C 1.6 0.063
D 1 0.039

E 0.49 0.55 0.019 0.022

F 0.66 0.75 0.026 0.030
G 1.02 1.27 1.52 0.040 0.050 0.060

G1 17.53 17.78 18.03 0.690 0.700 0.710
H1 19.6 0.772
H2 20.2 0.795

L 21.9 22.2 22.5 0.862 0.874 0.886

L1 21.7 22.1 22.5 0.854 0.870 0.886
L2 17.65 18.1 0.695 0.713
L3 17.25 17.5 17.75 0.679 0.689 0.699
L4 10.3 10.7 10.9 0.406 0.421 0.429
L7 2.65 2.9 0.104 0.114

M 4.25 4.55 4.85 0.167 0.179 0.191

M1 4.63 5.08 5.53 0.182 0.200 0.218

S 1.9 2.6 0.075 0.102

S1 1.9 2.6 0.075 0.102

Dia1 3.65 3.85 0.144 0.152

mm inch

11/12

TDA7494

Information furnis hed is believe d to be ac curate and reliabl e. However, SGS-THOMS ON Mi croelect ronics as sumes no res ponsib ility for the
consequences of use of such information nor for any infringement of patents or othe r ri ghts of third parties w hi ch m ay result from i ts use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specification me ntio ned
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 for use as critical components in life support devices or systems without express
written approval of SGS-THOMSON Microelectronics.

© 1997 SGS-THOMSON Microelectronics – Printed in Italy – All Rights Reserved

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.

12/12