TDA4472-A Datasheet, PDF (8/14 Pages) TEMIC Semiconductors – Video-IF (VIF) with FPLL Demodulation and Quasi Parallel Sound (QPS) Processing

TDA4472-A
TELEFUNKEN Semiconductors
Notes
1. This parameter is given as an application information
and not tested during production.
2. In VCR mode the VIF- and SIF path is switched off.
3. Adjustment of turn over point (delayed tuner AGC)
with external resistor R_top or external voltage V_top
possible.
4. The oscillator drift is related to the picture carrier fre-
quency, at external temperature-compensated LC
circuit.
5. a (1.07) = 20 log (4.43 MHz component/1.07 MHz
component); a (1.07) value related to black-white
signal input signal conditions:
picture carrier
0 dB
colour carrier
–6 dB
sound carrier
–24 dB
6. Without control voltage at pin 19 the ”on” mode is
automatically selected.
7. Picture carrier PC = 38.9 MHz; sound carrier
SC₁ = 33.4 MHz, SC₂ = 33.16 MHz;
PC/SC₁ = 13 dB; PC/SC₂ = 20 dB; PC unmodulated
(equivalent to sync peak level).
8. Without control voltage at Pin 3 SIF input 1 is
automatically selected.
SIF 2
Loop
comp.
Intercarrier
(FM/NICAM)
AFC
+V_S
AFC
switch
Loop
filter
10 k W
NC
6.8 pF
L_VCO
150 W
C_VCO
470 nF
C_Ref
2.2 mF
NC
28
27
26
25
24
23
22
21
20
19
18
17
16
15
TDA4472
1
2
3
4
5
6
7
8
9
10
11
12
13
14
10 mF
2.2 mF
10 k W
NC NC
SIF 1
SIF
Input switch
AGC (SIF)
AGC (VIF)
VIF
Tuner
delay Tuner Video
AGC
*) External L/C circuit (VCO: 38.9 MHz) with TOKO coil 7KN (9 turns, ∅ 0.12 mm)
Figure 3. Test circuit
8 (14)
Rev. A1: 26.07.1995