SGS Thomson Microelectronics TDA7434 Datasheet
BASIC FUNCTION AUDIO PROCESSOR
TWOSTEREOAND ONE MONOINPUTS
MUTE FUNCTION (SOFTWARE AND HARD-
WARE) CONTROLLED
VOLUMECONTROL IN 1dB STEP
BASS AND TREBLE CONTROL
FOURSPEAKERATTENUATORS:
– Independentattenuationcontrol
– Independentmutefunction
ALL FUNCTIONS PROGRAMMABLE VIA
2
CBUS
I
FULLY PROGRAMMABLE LOUDNESS CON-
TROL
DESCRIPTION
The TDA7434 is a volume, tone (bass and treble)
balance (Left / Right) fader (Front / Rear) processor for quality audio applications in car radio and
Hi-Fi systems.
Control is accomplished by serial bus microprocessor interface.
TDA7434
SDIP24
ORDERING NUMBER:
The AC signal setting is obtained by resistor networks and switches combined with operational
amplifiers.
Thanks to the advanced BIPOLAR/CMOS Technology, the external components have been reduced.
TDA7434
BLOCK DIAGRAM
IN1_L
IN2_L
MONO/MUTE
IN2_R
IN1_R
S
4.7K
100nF 100nF
LOUD_L
6
2
MUX
4
1
5
20
MUX
SUPPLYV
23
GND
24 10 9 14
BIN_L BOUT_L TRL
7
VOL BASS TREBLE
VOL BASS TREBLE
12 11 13
S BUS DECODER + LATCHES
8
LOUD_R
BIN_R BOUT_R TRRCREF
100nF 100nF
4.7K
2.7nF
2.7nF
SPKR
ATT
SPKR
ATT
SPKR
ATT
SPKR
ATT
19
17
21
22
18
16
D95AU360A
LEFT FRONT
LEFT REAR
SCL
SDA
RIGHT FRONT
RIGHT REAR
August 1996
This is advanced information on a new product now in development or undergoingevaluation. Details are subject to change without notice.
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TDA7434
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
S
T
amb
T
stg
QUICK REFERENCE DATA
Symbol Parameter Min. Typ. Max. Unit
V
S
V
CL
THD Total Harmonic Distortion (V = 1Vrms f = 1kHZ) 0.05 %
S/N Signal to Noise Ratio 102 dB
Sc Channel Separation f = 1kHz 100 dB
Operating Supply Voltage 10.2 V
Operating Temperature Range -40 to 85 °C
Storage Temperature Range -55 to +150 °C
Supply Voltage 7 9 10.2 V
Max. Input SignalHandling 1.3 1.6 Vrms
Volume Control 1dB step -79 +32 dB
Bass Control 2dB step -18 +18 dB
Treble Control 2dB step -14 +14 dB
Speaker Attenuators -37.5 0 dB
Mute Attenuation 100 dB
PIN CONNECTION (Top View)
MONO/MUTE
LOUD_L
LOUD_R
BOUT_R
BOUT_L
IN2_L
N.C.
IN1_R
IN1_L
BIN_R
BIN_L
1
2
3
4
5
6
7
8
9
10
11
12
D95AU361
24
23
22
21
20
19
18
17
16
15
14
13
CREFIN2_R
GND
SDA
SCL
V
S
OUT_LF
OUT_RF
OUT_LR
OUT_RR
N.C.
TRR
TRL
THERMAL DATA
Symbol Parameter Value Unit
Thermal Resistance Junction-pins Max. 65 °C/W
2/10
R
th j-pins
APPLICATIONCIRCUIT
TDA7434
68nF
LOUD_L
7
100nF
100nF
100nF
100nF
100nF
9V
V
S
100nF
IN1_L
IN2_L
MONO/
MUTE
IN2_R
IN1_R
V
6
2
4
1
5
20
S
MUX
MUX
SUPPLY
23
GND
10µF 68nF
VOL BASS TREBLE
VOL BASS TREBLE
24 10 9 14
8
LOUD_R
4.7K
100nF 100nF
BIN_L BOUT_L TRL
12 11 13
S BUS DECODER + LATCHES
BIN_R BOUT_R TRRCREF
100nF 100nF
4.7K
2.7nF
2.7nF
SPKR
ATT
SPKR
ATT
SPKR
ATT
SPKR
ATT
19
17
21
22
18
16
D95AU362A
LEFT FRONT
LEFT REAR
SCL
SDA
RIGHT FRONT
RIGHT REAR
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