Samsung HT-DL70D, Service Manual

Page: 45 / 70

8-2 Samsung Electronics
2. TDA7440D
TDA7440D
TONE CONTROL
DIGITALLY CONTROLLED AUDIO PROCESSOR
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.
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
[
0/30dB 0/30dB
2dB STEP
MUXOUTL INL
VOLUME
VOLUME
TREBLE
TREBLE
TREBLE(L)
MUXOUTR INR TREBLE(R)
BOUT(L)
SPKR ATT ATT
LEFT
LOUT
SCL
SDA
DIG_GND
ROUT
D98AU883 D98AU883
I
2
CBUS D LATCHES
100K
100K
100K
100K
G
L-IN1
L-IN2
L-IN3
L-IN4
100K
100K
100K
100K
R-IN1
R-IN2
R-IN3
R-IN4
G
INPUT MULTIPLEXER MULTIPLEXER
+ GAIN
BASS
BIN(L)
BASS
SPKR ATT ATT
RIGHT
BOUT(R) BIN(R)
SUPPLY
CREF
AGND
V
S
27
4
5
6
7
3
2
1
28
21
22
20
26
24
25
10 11 19 12 13 23
8 9 18 14 15
R
B
R
B
V
REF REF
BLOCK DIAGRAM
ORDERING NUMBER: TDA7440D
SO28