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參數(shù)資料
| 型號： | TDA4474 |
| 英文描述： | Multistandard Video-IF and Quasi Parallel Sound Processing |
| 中文描述： | 多標準視頻中頻和準并行聲音處理 |
| 文件頁數(shù)： | 11/18頁 |
| 文件大小： | 295K |
| 代理商： | TDA4474 |
TELEFUNKEN Semiconductors
TDA4474
Preliminary Information
Rev. A1: 17.08.1995
11 (17)
7.
Without control voltage at Pin 16 (open circuit) the L’ switch is not active.
Standard switch, Pin 15
Mode 1: neg. modulation (B/G)
2.0 V – V
s
3.4 V – 4.5 V
(or Pin 16 open)
1 V
Mode 2: pos. modulation (L)
0 – 0.8 V
L’/VIF input switch, Pin 16
0 – 3.1 V
3.4 V – 4.5 V
(or Pin 16 open)
0 – 3.1 V
Ext. voltage at VIF input 2
Pin 10 or 11
Modulation
Standard
Active VIF input
ááááááááááááááááááááá
áááá
neg.
B/G,...
ááááááááááááááááááááá
áááááááááááá
neg.
B/G,...
á
neg.
B/G,...
á
*)
*)
á
neg.
L
neg.
L
neg.
L’
neg.
L’
ááááááááááááááááááááá
áá
ááááááááááááááááááááá
áá
áá
áá
áááááááá
áá
*) condition not useful
8.
Picture carrier PC = 38.9 MHz; sound carrier SC
1
= 33.4 MHz, SC
2
= 33.16 MHz;
PC/SC
1
=13 dB; PC/SC
2
= 20 dB; PC unmodulated (equivalent to sync peak level)
9.
Sound carrier SC = 32.4 MHz, modulated with f
mod
= 1 kHz, m = 54 %; v
in
= 10 mV
10.
Without control voltage at Pin 3 (open circuit) the SIF input 1 is automatically selected
29
28
27
25
24
23
22
21
20
19
18
17
16
15
2
3
5
4
6
7
8
9
10
11
12
13
14
6.8 pF
L
VCO
C
VCO
Loop
filter
150
470 nF
AFC
switch
AFC
Intercarrier
(FM/NICAM)
AF
(AM)
10 k
Loop
comp.
SIF 2
C
Ref
2.2 F
Black
level
470 nF
10 k
Tuner
delay
Tuner
AGC
Video
Standard switch
(neg/pos)
AGC (VIF)
VIF 1
AGC (SIF)
SIF
Input switch
SIF 1
9
TDA4474
30
1
26
L’ and
VIF input
switch
VIF 2
10 F
2.2 F
+V
S
*) External L/C circuit (VCO: 38.9 MHz) with TOKO coil 7KN (9 turns, 0.12mm)
Figure 3.
Test circuit
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