TDA7468 Schematic ( Datenblatt PDF ) - STMicroelectronics

		


TDA7468
TWO BANDS DIGITALLY CONTROLLED
AUDIO PROCESSOR WITH BASS ALC SURROUND
1 FEATURES
„ INPUT MULTIPLEXER
– 4 STEREO INPUTS
– SELECTABLE INPUT GAIN FOR OPTIMAL
ADAPTATION TO DIFFERENT SOURCES
„ ONE STEREO OUTPUT
„ BASS ALC
„ 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
„ EXTERNALLY ADJUSTABLE SURROUND
2 DESCRIPTION
The TDA7468D is a volume tone (bass and treble)
balance (Left/Right) processor for quality audio
Figure 1. Package
SO28
Table 1. Order Codes
Part Number
TDA7468D
TDA7468D13TR
Package
SO28
Tape & Reel
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
Figure 2. PIN CONNECTION (Top view)
April 2010
VS
MIC
IN1_L
IN2_L
IN3_L
IN4_L
MUX_L
IS_L
TREBLE_L
BASSI_L
BASSO_L
OUT_L
DGND
SCL
1 28
2 27
3 26
4 25
5 24
6 23
7 22
8 21
9 20
10 19
11 18
12 17
13 16
14 15
D99AU1057
GND
CREF
IN1_R
IN2_R
IN3_R
IN4_R
MUX_R
IS_R
TREBLE_R
BASSI_R
BASSO_R
OUT_R
ALC
SDA
Rev. 4
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TDA7468
Figure 4. TEST CIRCUIT
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TDA7468
Table 10. VOLUME
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
000
001
010
011
100
101
110
111
000
001
010
011
100
101
110
111
00
01
10
11
VOLUME = 0 to-87dB
VOLUME
1dB STEPS
0dB
-1dB
-2dB
-3dB
-4dB
-5dB
-6dB
-7dB
8dB STEPS
0dB
-8dB
-16dB
-24dB
-32dB
-40dB
-48dB
-56dB
VOLUME 2
0dB
-8dB
-16dB
-24dB
Table 11. VOLUME setting 1
Target Volume (dB)
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
-12
-13
-14
-15
Volume1 1dB step (dB)
0
-1
-2
-3
-4
-5
-6
-7
0
-1
-2
-3
-4
-5
-6
-7
Volume1 8dB step (dB)
0
-8
Volume2 8dB step (dB)
0
0
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