Tone Control - Samsung HT-DL70D Service Manual

2. TDA7440D
[
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
DESCRIPTION
The TDA7440D is a volume tone (bass and
treble) balance (Left/Right) processor for quality
audio applications in Hi-Fi systems.
BLOCK DIAGRAM
4
L-IN1
5
L-IN2
6
L-IN3
7
L-IN4
3
R-IN1
2
R-IN2
1
R-IN3
28
R-IN4
8-2
DIGITALLY CONTROLLED AUDIO PROCESSOR
MUXOUTL
100K
100K
G
100K
100K
0/30dB 0/30dB
2dB STEP
100K
100K
G
100K
INPUT MULTIPLEXER MULTIPLEXER
100K
+ GAIN
MUXOUTR
ORDERING NUMBER: TDA7440D
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
INL TREBLE(L) BIN(L)
8 9 18 14
VOLUME TREBLE BASS
2
I CBUS DECODER + LATCHES
VOLUME TREBLE BASS
10 11 19 12
INR TREBLE(R) BIN(R)
TDA7440D

TONE CONTROL

SO28
BOUT(L)
15
R
B
27
SPKR ATT ATT
LOUT
LEFT
21
SCL
22
SDA
20
DIG_GND
26
SPKR ATT ATT
ROUT
RIGHT
V
REF REF
24
V
S
SUPPLY 25
AGND
R
B
13 23
D98AU883 D98AU883
BOUT(R) CREF
Samsung Electronics