SGS Thomson Microelectronics TDA7345D Datasheet
DIGITALLY CONTROLLED AUDIO PROCESSOR
WITH SURROUND SOUND MATRIX
1 STEREOINPUT
VOLUMECONTROLIN 1.25dB STEP
TREBLEAND BASSCONTROL
THREE SURROUND MODES ARE AVAIL-
ABLE:
– MOVIE,MUSIC AND SIMULATED
FOURSPEAKER ATTENUATORS:
– 4INDEPENDENT SPEAKERSCONTROL
IN 1.25dBSTEPSFOR BALANCEFACILITY
– INDEPENDENTMUTE FUNCTION
ALL FUNCTIONS PROGRAMMABLE VIA SE-
RIAL BUS
DESCRIPTION
The TDA7345 is a volume tone (bass and treble)
balance (Left/Right) processor for quality audio
applicationsin car radio and Hi-Fi systems.
It 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-
TDA7345
SO28
ORDERING NUMBER:
works and switches combined with operational
amplifiers.
Thanks to the usedBIPOLAR/CMOSTechnology,
Low Distortion, Low Noise and DC stepping are
obtained.
TDA7345D
PIN CONNECTION
CREF
PS2
PS1
LP1
HP1 REAR IN
HP2
L-in
BASS-LA
BASS-LB
TREBLE-L
REC_OUT_L
REC_OUT_R
Lout
Rout
1
2
3
4
5
6
7
8
9
10
11
12
13
14
D94AU191A
28
27
26
25
24
22
21
20
19
18
17
16
15
Vs
PS3
PS4
LP
REAR OUT23
R-in
BASS-RA
BASS-RB
TREBLE-R
DIG GND
SDA
SCL
AGND
November 1999
1/18
TDA7345
BLOCK DIAGRAM
5.6nF
100nF
5.6K
100nF
TREBLE(L)
BASS-LB
8910
BASS-LA
SPKR
RB
11
ATT
REC_OUT_L
MUTE
ATT
SPKR
LOUT
13
TREBLE
BASS
VOL
MUTE
SCL
SDA
161718
DIG GND
C BUSDECODER + LATCHES
2
I
ATT
SPKR
ROUT
14
VOL BASS TREBLE
MUTE
ATT
SPKR
REC_ OUT_R
12
MUTE
RB
D94AU192A
TREBLE(R)
21 20 19
5.6nF
BASS-RB
100nF 100nF
5.6K
22nF
22nF
100nF
100nF
5.6nF 680nF
PS4
PS3
PS2
PS1
LP1 HP1 HP2
AMP
MIXING
PS4
RPS4
RPS3
RPS2
RPS1
RHP1
RLP1
4 5 6 3 2 27 26
0.47µF
400Hz
-
MUSIC
SIM
-
+
+
MOVIE/SIM
OFF
MUSIC
MOVIE/
-
L-R
+
+
PS3
400Hz
PS2
4KHz
PHASE SHIFTER
PS1
90Hz
R6
R5
50K
7
L-in
AMP
MIXING
EFFECT
CONTROL
LPF
9KHz
REAR IN
24
REAR OUT
1.2nF
LP BASS-RA
C5
22µF
AGND CREF
SUPPLY
S
V
28 15 1 25 23
50K
22
R-in
0.47µF
2/18
TEST CIRCUIT
TDA7345
680nF
C16
0.47µF
C17
C20 100nF
BASS-LA
C21 100nF
BASS-LB
R2
5.6K
TREBLE-L
5.6nF
C22
D94AU193A
THERMAL DATA
5.6nF C15 100nF C14 22µF C3 100nF C2100nF C13 10µFC1
LP1 PS1 PS2 CREF V
HP1
5
6
HP2
L-in
7
TDA7345
8
9
10
11
REC OUT L
12
REC OUTR
13 14 15 1716 18
LOUT ROUT AGND SCL SDA DIG GND
22nF C4
S
PS3
22nF C5
PS4
2627128234
25
24
23
22
21
20
19
LP
1.2nF
C6
REAR IN
2.2µF
REAR OUT
0.47µFC7
R-in
C10 100nF
BASS-RA
C11 100nF
BASS-RB
TREBLE-R
5.6nF
C12
R1
5.6K
Symbol Description Value Unit
R
thj-pins
Thermal Resistance Junction-pins Max. 85
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
T
amb
T
Operating Supply Voltage 11 V
S
Operating Ambient Temperature -10 to 85 °C
Storage Temperature Range -55 to +150 °C
stg
QUICK REFERENCE DATA
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
Supply Voltage 7 9 10.5 V
S
Max. input signal handling 2 Vrms
out = 1Vrms (made = OFF) 106 dB
Channel Separation f= 1KHz 70 dB
C
Volume Control 1.25dB step -78.75 0 dB
Treble Control (2db step) -14 +14 dB
Bass Control (2db step) -14 +14 dB
Balance Control 1.25dB step REC-OUT L & R -38.75 0 dB
Balance Control 1.25dB step (L
OUT,ROUT
) -78.75 0 dB
Mute Attenuation 90 dB
C/W
°
3/18
TDA7345
ELECTRICALCHARACTERISTICS
R
= 600Ω, all controls flat (G = 0),Effect Ctrl = -6dB, MODE= OFF; f = 1KHz
G
(refer to the testcircuit T
=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 10.5 V
Supply Current 20 25 35 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 35 50 65 KΩ
Clipping Level THD = 0.3%; Lin or Rin 2 2.5 Vrms
THD = 0.3%; Rin + Lin (2) 3.0 Vrms
Control Range 19.68 dB
Min. Attenuation -1 0 1 dB
Max. Attenuation 18.68 19.68 20.68 dB
Step Resolution 0.11 0.31 0.51 dB
DC Steps adjacent att. step -3 0 3 mV
VOLUMECONTROL
C
RANGE
A
VMIN
A
VMAX
A
STEP
E
A
E
T
V
DC
Control Range 70 75 dB
Min. Attenuation -1 0 1 dB
Max. Attenuation 70 75 dB
Step Resolution Av = 0to -40dB 0.5 1.25 1.75 dB
Attenuation Set Error Av = 0to -20dB
Av = -20to -60dB
-1.5
-3
0 1.5
2
Tracking Error 2dB
DC Steps adjacent attenuation steps -3 0 3 mV
BASS CONTROL (1)
dB
dB
Gb Control Range Max. Boost/cut +11.5 +14.0 +16.0 dB
B
STEP
R
B
Step Resolution 1 2 3 dB
Internal Feedback Resistance 32 44 56 KΩ
TREBLECONTROL (1)
Gt Control Range Max. Boost/cut +13 +14 +15 dB
T
STEP
Step Resolution 1 2 3 dB
EFFECTCONTROL
4/18
C
RANGE
S
STEP
Control Range -21 -6 dB
Step Resolution 0.5 1 1.5 dB
TDA7345
ELECTRICALCHARACTERISTICS
(continued)
SURROUNDSOUND MATRIX
Symbol Parameter Test Condition Min. Typ. Max. Unit
In-phase Gain (OFF) Mode OFF,Input signalof
LR In-phase Gain Difference
D
G
GOFF
OFF
(OFF)
G
MOV1
G
MOV2
D
GMOV
In-phase Gain (Movie 1) Moviemode, Effect Ctrl = -6dB
In-phase Gain (Movie 2) Moviemode, Effect Ctrl = -6dB
LR In-phase Gain Diffrence
(Movie)
G
MUS1
G
MUS2
D
GMUS
In-phase Gain (Music 1) Music mode, Effect Ctrl = -6dB
In-phase Gain (Music 2) Music mode, Effect Ctrl = -6dB
LR In-phase Gain Difference
(Music)
L
MON1
L
MON2
L
MON3
R
MON1
R
MON2
R
MON3
R
LP1
R
PS1
R
PS2
R
PS3
R
PS2
R
HPI
R
LPF
Simulated L Output 1 SimulatedMode,EffectCtrl= -6dB
Simulated L Output 2 SimulatedMode,EffectCtrl= -6dB
Simulated L Output 3 SimulatedMode, EffectCtrl= -6dB
Simulated R Output 1 SimulatedMode,EffectCtrl= -6dB
Simulated R Output 2 SimulatedMode,EffectCtrl= -6dB
Simulated R Output 3 SimulatedMode,EffectCtrl= -6dB
Low Pass FilterResistance 7.5 10 12.5 K
Phase Shifter1 Resistance 13.5 17.95 22.5 k
Phase Shifter2 Resistance 0.30 0.40 0.50 KΩ
Phase Shifter3 Resistance 13.6 18.08 22.6 KΩ
Phase Shifter4 Resistance 13.6 18.08 22.6 KΩ
High Pass Filter Resistance 45 60 75 KΩ
LP PinImpedance 7.5 10 12.5 K
1kHz, 1.4 V
Lin→ L
out
p-p,Rin
→ R
out
Mode OFF,Input signalof
1kHz, 1.4 V
(Rin→ R
Input signal of 1kHz, 1.4 V
Rin→ R
Input signal of 1kHz, 1.4 V
R
→
in
out
out,Lin
R
out,Lin
p-p
), (Lin→ L
→ L
out
L
→
out
out
)
p-p
p-p
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
Input signal of 1kHz, 1.4 V
Rin→ R
out,Lin
→ L
out
out
out
p-p
)
p-p
)
p-p
Music mode, Effect Ctrl = -6dB
Input signal of 1kHz, 1.4 V
R
(R
in
→
out
)–(L
→
in
p-p
L
)
out
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
Input signal of 3.6kHz,
1.4 V
p-p,Rin
and Lin→ L
out
Input signal of 250Hz,
1.4 V
p-p,Rin
and Lin→R
out
Input signal of 1kHz,
1.4 V
p-p,Rin
and L
R
→
in
out
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
Ω
5/18
TDA7345
ELECTRICALCHARACTERISTICS(continued)
Symbol Parameter Test Condition Min. Typ. Max. Unit
SPEAKERATTENUATORS (REC_OUT_L, REC_OUT_R)
C
S
A
range
STEP
E
MUTE
V
DC
A
Control Range 35 37.5 40 dB
Step Resolution 0.5 1.25 1.75 dB
Attenuation set error -1.5 1.5 dB
Output Mute Attenuation 80 90 dB
DC Steps adjacent att. steps -3 0 3 mV
SPEAKERATTENUATORS (LOUT,ROUT)
C
S
A
range
STEP
E
V
DC
MUTE
A
Control Range 70 75 dB
Step Resolution Av = 0 to -40dB 0.5 1.25 1.75 dB
Attenuation set error Av = 0 to 20dB -1.5 0 1.5 dB
Av = -20 to -60dB -3 0 2 dB
DC Steps adjacent att. steps -3 0 3 mV
Output Mute Attenuation 80 90 dB
AUDIO OUTPUTS (LOUT,ROUT, REC_OUT_L, REC_OUT_R)
V
OCL
R
OUT
V
OUT
Clipping Level d =0.3% 2 2.5 Vrms
Output resistance 100 200 300 Ω
DC Voltage Level 4.2 4.5 4.8 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= 20Hzto 20KHz
Output LOUT, ROUT,
Output: REC-OUT-L,
REC-OUT-R
Output Noise(Movie) Mode =Movie ,
B
= 20Hzto 20KHz
W
R
out
and L
measurement
out
Output Noise(Music) Mode = Music ,
B
= 20Hzto 20KHz,
W
R
out
and L
measurement
out
Output Noise(Simulated) Mode = Simulated,
B
= 20Hzto 20KHz
W
R
out
and L
measurement
out
in = 1Vrms 0.02 0.1 %
Channel Separation 60 70 dB
BUS INPUTS
8
8
1515µVrms
Vrms
µ
30 µVrms
30 µVrms
30
Vrms
µ
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 0.8 V
Acknowledge
Note:
(1) Bass and 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.
V
(2) The peack voltage of the two input signals must be less then
V
(Lin + Rin)
peak
•
S
<
A
Vin
2
S
:
2
6/18
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