TDA7344
DIGITAL CONTROLLED AUDIO PROCESSOR
WITH SURROUND SOUND MATRIX
1 STEREO INPUT
VOLUME CONTROL IN 1.25dB STEP
TREBLE AND BASS CONTROL
THREE SURROUND MODES ARE AVAIL-
ABLE:
– MOVIE, MUSIC AND SIMULATED
FOUR SPEAKER ATTENUATORS:
– 4 INDEPENDENT SPEAKERS CONTROL
IN 1.25dB STEPS FOR BALANCE FACILITY
– INDEPENDENT MUTE FUNCTION
ALL FUNCTIONS PROGRAMMABLE VIA SE-
RIAL BUS
DESCRIPTION
The TDA7344 is a volume tone (bass and treble)
balance (Left/Right) processor for quality audio
applications in car radio and Hi-Fi systems.
It reproduces surround sound by using phase
PIN CONNECTIONS
PQFP44
(10 X 10)
SDIP42
ORDERING NUMBERS:
TDA7344P (PQFP44)
TDA7344S (SDIP42)
shifters and a signal matrix. Control of all the
functions is accomplished by serial bus.
The AC signal setting is obtained by resistor net-
works and switches combined with operational
amplifiers.
Thanks to the used BIPOLAR/CMOS Technology,
Low Distortion, Low Noise and DC stepping are
obtained.
February 1997
1/20
TDA7344
TEST CIRCUIT
THERMAL DATA
Symbol
R
th j-pins
Thermal Resistance Junction-pins
Description
Ma x.
Value
85
Unit
°C/W
ABSOLUTE MAXIMUM RATINGS
Symbol
V
S
T
amb
T
stg
Operating Supply Voltage
Operating Ambient Temperature
Storage Temperature Range
Parameter
Value
11
-10 to 85
-55 to +150
Unit
V
°
C
°C
QUICK REFERENCE DATA
Symbol
V
S
V
CL
THD
S/N
S
C
Supply Voltage
Max. input signal handling
Total Harmonic Distortion V = 1Vrms f = 1KHz
Signal to Noise Ratio V
out
= 1Vrms (made = OFF)
Channel Separation f = 1KHz
Volume Control
Treble Control
Balance Control
Mute Attenuation
1.25dB step
(2db step)
1.25dB step (L
CH,
R
CH
)
-78.75
-14
-14
-38.75
90
Parameter
Min.
7
2
0.02
106
70
0
+14
+14
0
0.1
Typ.
9
Max.
10.5
Unit
V
Vrms
%
dB
dB
dB
dB
dB
dB
dB
Bass Control (2db step)
3/20
TDA7344
ELECTRICAL CHARACTERISTICS
(refer to the test circuit T
amb
= 25°C, V
S
= 9V, R
L
= 10K
Ω
,
R
G
= 600Ω, all controls flat (G = 0),Effect Ctrl = -6dB, MODE = OFF; f = 1KHz
unless otherwise specified)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
SUPPLY
V
S
I
S
SVR
Supply Voltage
Supply Current
Ripple Rejection
L
CH
/ R
CH out
, Mode = OFF
7
20
60
9
25
80
10.5
35
V
mA
dB
INPUT STAGE
R
II
V
CL
C
RANGE
A
VMIN
A
VMAX
A
STEP
V
DC
Input Resistance
Clipping Level
Control Range
Min. Attenuation
Max. Attenuation
Step Resolution
DC Steps
adjacent att. step
-1
18.68
0.11
-3
THD = 0.3%; Lin or Rin
THD = 0.3%; Rin + Lin (2)
35
2
50
2.5
3.0
19.68
0
19.68
0.31
0
1
20.68
0.51
3
65
KΩ
Vrms
Vrms
dB
dB
dB
dB
mV
VOLUME CONTROL
C
RANGE
A
VMIN
A
VMAX
A
STEP
E
A
E
T
V
DC
Control Range
Min. Attenuation
Max. Attenuation
Step Resolution
Attenuation Set Error
Tracking Error
DC Steps
adjacent attenuation steps
From 0dB to Av max
-3
-5
0
0.5
Av = 0 to -40dB
Av = 0 to -20dB
Av = -20 to -60dB
70
-1
70
0.5
-1.5
-3
75
0
75
1.25
0
1.75
1.5
2
2
3
5
1
dB
dB
dB
dB
dB
dB
dB
mV
mV
BASS CONTROL (1)
Gb
B
STEP
R
B
Control Range
Step Resolution
Internal Feedback Resistance
Max. Boost/cut
+11.5
1
32
+14
2
44
+16
3
56
dB
dB
KΩ
TREBLE CONTROL (1)
Gt
T
STEP
Control Range
Step Resolution
Max. Boost/cut
+13
0.5
+14
2
+15
1.5
dB
dB
EFFECT CONTROL
C
RANGE
S
STEP
Control Range
Step Resolution
- 21
1
-6
dB
dB
4/20
TDA7344
ELECTRICAL CHARACTERISTICS
(continued)
SURROUND SOUND MATRIX
Symbol
G
OFF
Parameter
In-phase Gain (OFF)
Test Condition
Mode OFF, Input signal of
1kHz, 1.4 V
p-p
, R
in
→
R
out
L
in
→
L
out
Mode OFF, Input signal of
1kHz, 1.4 V
p-p
(R
in
→
R
out
), (L
in
→
L
out
)
Movie mode, Effect Ctrl = -6dB
Input signal of 1kHz, 1.4 V
p-p
R
in
→
R
out
, L
in
→
L
out
Movie mode, Effect Ctrl = -6dB
Input signal of 1kHz, 1.4 V
p-p
R
in
→
R
out
, L
in
→
L
out
Movie mode, Effect Ctrl = -6dB
Input signal of 1kHz, 1.4 V
p-p
(R
in
→
R
out
) – (L
in
→
L
out
)
Music mode, Effect Ctrl = -6dB
Input signal of 1kHz, 1.4 V
p-p
(R
in
→
R
out
) – (L
in
→
L
out
)
Music mode, Effect Ctrl = -6dB
Input signal of 1kHz, 1.4 V
p-p
R
in
→
R
out
, L
in
→
L
out
Music mode, Effect Ctrl = -6dB
Input signal of 1kHz, 1.4 V
p-p
(R
in
→
R
out
) – (L
in
→
L
out
)
Simulated Mode, EffectCtrl = -6dB
Input signal of 250Hz,
1.4 V
p-p
, R
in
and L
in
→
L
ou t
Simulated Mode, EffectCtrl = -6dB
Input signal of 1kHz,
1.4 V
p-p
, R
in
and L
in
→
L
ou t
Simulated Mode, EffectCtrl = -6dB
Input signal of 3.6kHz,
1.4 V
p-p
, R
in
and L
in
→
L
ou t
Simulated Mode, EffectCtrl = -6dB
Input signal of 250Hz,
1.4 V
p-p
, R
in
and L
in
→R
out
Simulated Mode, EffectCtrl = -6dB
Input signal of 1kHz,
1.4 V
p-p
, R
in
and L
in
→R
out
Simulated Mode, EffectCtrl = -6dB
Input signal of 3.6kHz,
1.4 V
p-p
, R
in
and L
in
→
R
out
7.5
13.5
0.3
13.6
13.6
45
7.5
Min.
-1.5
Typ.
0
Max.
1.5
Unit
dB
D
GOFF
LR In-phase Gain Difference
(OFF)
In-phase Gain (Movie 1)
-1.5
0
1.5
dB
G
MOV1
7
dB
G
MOV2
In-phase Gain (Movie 2)
8
dB
D
GMOV
LR In-phase Gain Diffrence
(Movie)
In-phase Gain (Music 1)
0
dB
G
MUS1
6
dB
G
MUS2
In-phase Gain (Music 2)
7.5
dB
D
GMUS
LR In-phase Gain Difference
(Music)
Simulated L Output 1
0
dB
L
MON1
4.5
dB
L
MON2
Simulated L Output 2
– 4.0
dB
L
MON3
Simulated L Output 3
7.0
dB
R
MON1
Simulated R Output 1
– 4.5
dB
R
MON2
Simulated R Output 2
3.8
dB
R
MON3
Simulated R Output 3
– 20
dB
R
LP1
R
PS1
R
PS2
R
PS3
R
PS4
R
HPF
R
LPF
Low Pass Filter Resistance
Phase Shifter 1 Resistance
Phase Shifter 2 Resistance
Phase Shifter 3 Resistance
Phase Shifter 4 Resistance
High Pass Filter Resistance
LP Pin Impedance
10
17.95
0.4
18.08
18.08
60
10
12.5
22.5
0.5
22.6
22.6
75
12.5
KΩ
k
Ω
KΩ
KΩ
KΩ
K
Ω
KΩ
5/20
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