TDA4474 Datasheet, PDF (2/17 Pages) TEMIC Semiconductors – Multistandard Video-IF and Quasi Parallel Sound Processing

TDA4474
TELEFUNKEN Semiconductors
Offset
comp.
(optional)
Loop
filter
VCO
L’ switch
and VIF input switch
28
20
22
23
16
10
VIF 2
11
6
VIF 1
7
C_AGC
8
17
Tuner
C_BL
13
12
Take over
point
29
SIF 2
30
SIF input switch 3
FPLL
0°
90°
VIF amp
AGC
(VIF)
Tuner
AGC
SIF amp
VCO
+
phase shift
Control
AFC
Ï ²¹
AFC
switch
24
AFC
14
Video
Video det.
Supply
FM det.
Standard
15
Standard
switch
25
V_S
19
C_Ref
26
Intercarrier
(FM / NICAM)
1
SIF 1
2
5
C_AGC
AGC
(SIF)
AM det.
Figure 1. Block diagram
27 ^{AF (AM)}
4,9,18
94 7901
2 (17)
Preliminary Information
Rev. A1: 17.08.1995