TDA4455 Datasheet, PDF (2/12 Pages) TEMIC Semiconductors – Multistandard VIF Amplifier and PLL Demodulator

TDA4455
TELEFUNKEN Semiconductors
Block Diagram
Input
selector
switch
16
Loop filter
13
12 10
VCO Tank
9
11 Standard switch
17
IF Input 2
18
1
IF Input 1
2
4
Tuner AGC
Lock ^Video
detector
VCO
90°
0°
Overload
detector
+/–
B/G
L
D2MAC
R_O
B/G
D2MAC
L
3
Tuner AGC
take over
6
IF AGC
5
8
Average
(only L, D2MAC)
93 7502
+
=
Interference
rejection
7
Video
output
15
V_S
14 ^{Int. Ref}
Pin Description
Pin
1, 2
3
4
5, 14
6
7
8
Symbol
Function
IF input 1
Tuner AGC adjustment (turn
over point)
Delayed tuner AGC current
Ground
IF AGC time constant
Video output
Video averaging for standard L
and D2MAC
Pin
9, 10
11
12
13
15
16
17, 18
Symbol
Function
VCO circuit
Standard switch
PLL loop filter
PLL time constant switch
Supply voltage
Input selector switch
IF input 2
2 (12)
Preliminary Information
Rev. A1: 08.05.1995