TDA7335 Datasheet, PDF (10/20 Pages) STMicroelectronics – STEREO PREAMP AMS DOLBY B* NOISE REDUCTION PROCESSOR

TDA7335
ELECTRICAL COMPONENT DESCRIPTION (see figure 1)
COMPONENT
P
R
E
A
M
P
TR1,TR2
C1, C2
C3, C4
R1, R2
R3, R5
R4, R6
C5, C6
R8
C8
A
M
R7
S
C7
R9
C9
C1 5
C10, C11
D
O
C12, C13
L
C1 4
B
Y
R1 1
C1 6
R1 6
RECOMMENDED
VALUE
1KΩ
1µF
10nF
1.2KΩ
6.8KΩ
300KΩ
0.33µF ±10%
10kΩ 0.22µF
470KΩ
0.1µF
100KΩ
1µF
0.1µF
0.68µF ±10%
4.7µF ±10%
4.7µF
43KΩ
0.1µF
30KΩ
PURPOSE
Left/Right Channel IN/OUT equalizer filter
TR fixes the gain
150msec NORMAL
70µsec METAL
Preamplifier out to Dolby B input coupling capacitor
Define the AMS input threshold level
V_in
⋅
101K + R₈
1K + R₈
⋅1.5
>
1V
where Vin = (Vright + Vleft)/2
Set the interprogram detection time:
INTP = 70 x 10^-3 x C7[µF] = [sec]
Set the interspace detection time:
INTS = 0.69 x C9 x R9 sec
It fixes music search reset time;
Tres = 0.122 x C15[µF] = [sec] if C15 expressed in µF
Dolby output coupling capacitors
Dolby time constants
Reference voltage external capacitor
It fixes the I_ref current
If fixes the mute time (typ 10msec).
PINS DESCRIPTION: Internal Configuration
Figure 5: PINS: 2 - 3 - 28 - 29
Figure 6: PINS: 7 - 24
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