TDA7440D
TONE CONTROL
DIGITALLY CONTROLLED AUDIO PROCESSOR
1
■
FEATURES
INPUT MULTIPLEXER
– 4 STEREO INPUTS
– SELECTABLE INPUT GAIN FOR OPTIMAL
ADAPTATION TO DIFFERENT SOURCES
ONE STEREO OUTPUT
TREBLE 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
Figure 1. Package
SO-28
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■
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Table 1. Order Codes
Part Number
TDA7440D
TDA7440D013TR
Package
SO-28
Tape & Reel
■
2
DESCRIPTION
The TDA7440D is a volume tone (bass and treble)
balance (Left/Right) processor for quality audio
applications in Hi-Fi systems.
Figure 2. Block Diagram
MUXOUTL
L-IN1
4
100K
5
100K
6
100K
7
100K
0/30dB
2dB STEP
100K
2
100K
1
G
VOLUME
8
INL
9
Selectable input gain is provided. 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
TREBLE(L)
18
BIN(L)
14
R
B
BOUT(L)
15
L-IN2
L-IN3
TREBLE
BASS
SPKR ATT
LEFT
27
LOUT
L-IN4
21
I CBUS DECODER + LATCHES
2
R-IN1
3
22
20
SCL
SDA
DIG_GND
R-IN2
G
VOLUME
TREBLE
BASS
SPKR ATT
RIGHT
V
REF
26
ROUT
R-IN3
100K
28
100K
INPUT MULTIPLEXER
+ GAIN
10
MUXOUTR
INR
11
19
TREBLE(R)
12
BIN(R)
R
B
13
BOUT(R)
23
CREF
D98AU883
24
SUPPLY
25
R-IN4
V
S
AGND
April 1999
REV. 3
1/17
STMICROELECTRONICS [ STMICROELECTRONICS ]
