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TDA7438 Datasheet

THREE BANDS DIGITALLY CONTROLLED AUDIO PROCESSOR

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® TDA7438
THREE BANDS
DIGITALLY CONTROLLED AUDIO PROCESSOR
INPUT MULTIPLEXER
- 3 STEREO INPUTS
- SELECTABLE INPUT GAIN FOR OPTIMAL
ADAPTATION TO DIFFERENT SOURCES
ONE STEREO OUTPUT
TREBLE, MIDDLE AND BASS CONTROL IN
2.0dB STEPS
VOLUME CONTROL IN 1.0dB STEPS
TWO SPEAKER ATTENUATORS:
- TWO INDEPENDENT SPEAKER CONTROL
IN 1.0dB STEPS FOR BALANCE FACILITY
- INDEPENDENT MUTE FUNCTION
ALL FUNCTION ARE PROGRAMMABLE VIA
SERIAL BUS
SO28
DIP28
ORDERING NUMBER: TDA7438D (SO28)
TDA7438 (DIP28)
DESCRIPTION
The TDA7438 is a volume tone (bass, middle and
treble) balance (Left/Right) processor for quality
audio applications in car-radio and Hi-Fi systems.
Selectable input gain is provided. Control of all
the functions is accomplished by serial bus.
BLOCK DIAGRAM
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.
3
L-IN1
4
L-IN2
5
L-IN3
100K
100K
100K
MUXOUTL INL
67
TREBLE(L) MIN(L) MOUT(L) BIN(L) BOUT(L)
18 17 16 14 15
RM RB
G
VOLUME
TREBLE
MIDDLE
BASS
SPKR ATT
LEFT
27
LOUT
2
R-IN1
1
R-IN2
28
R-IN3
100K
100K
100K
0/30dB
2dB STEP
I2CBUS DECODER + LATCHES
21
SCL
22
SDA
20
DIG_GND
G
VOLUME
TREBLE
MIDDLE
BASS
SPKR ATT
RIGHT
VREF
INPUT MULTIPLEXER
+ GAIN
89
MUXOUTR INR
SUPPLY
RM RB
19 10 11 12 13 23
TREBLE(R) MIN(R) MOUT(R) BIN(R) BOUT(R) CREF
26
ROUT
24
25 VS
AGND
D96AU488A
April 1999
1/17


STMicroelectronics Electronic Components Datasheet

TDA7438 Datasheet

THREE BANDS DIGITALLY CONTROLLED AUDIO PROCESSOR

No Preview Available !

TDA7438
ABSOLUTE MAXIMUM RATINGS
Symbol
VS
Tamb
Tstg
Parameter
Operating Supply Voltage
Operating Ambient Temperature
Storage Temperature Range
PIN CONNECTION
Value
10.5
-10 to 85
-55 to 150
Unit
V
°C
°C
R_IN2
R_IN1
L_IN1
L_IN2
L_IN3
MUXOUTL
INL
MUXOUTR
INR
MIN(R)
MOUT(R)
BIN(R)
BOUT(R)
BIN(L)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
D96AU489A
THERMAL DATA
Symbol
Rth j-pin
Parameter
Thermal Resistance Junction-pins
28
27
26
25
24
23
22
21
20
19
18
17
16
15
R_IN3
LOUT
ROUT
AGND
VS
CREF
SDA
SCL
DIG-GND
TREBLE(R)
TREBLE(L)
MIN(L)
MOUT(L)
BOUT(L)
Value
85
Unit
°C/W
QUICK REFERENCE DATA
Symbol
VS
VCL
THD
S/N
SC
Parameter
Supply Voltage
Max. input signal handling
Total Harmonic Distortion V = 1Vrms f = 1KHz
Signal to Noise Ratio V out = 1Vrms (mode = OFF)
Channel Separation f = 1KHz
Input Gain in (2dB step)
Volume Control (1dB step)
Treble Control (2dB step)
Middle Control (2dB step)
Bass Control (2dB step)
Balance Control 1dB step
Mute Attenuation (*)
Min.
6
2
0
-47
-14
-14
-14
-79
80
Typ.
9
0.01
106
90
100
Max.
10.2
0.1
30
0
+14
+14
+14
0
(*) Even applied to Speaker Attenuator Left, Speaker Attenuator Right, Volume Control stand alone or to the combination, if any.
Unit
V
Vrms
%
dB
dB
dB
dB
dB
dB
dB
dB
dB
2/17


Part Number TDA7438
Description THREE BANDS DIGITALLY CONTROLLED AUDIO PROCESSOR
Maker ST Microelectronics
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TDA7438 Datasheet PDF





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