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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)： | 10/18頁 |
| 文件大?。?/td> | 295K |
| 代理商： | TDA4474 |
TELEFUNKEN Semiconductors
TDA4474
Preliminary Information
Rev. A1: 17.08.1995
10 (17)
Electrical Characteristics
V
s
= +5V, T
amb
= +25
°
C; reference point 4 (9 ,16), unless otherwise specified
Parameters
Test Conditions / Pins
Pin 27 see note 9
Symbol
Min.
Typ.
Max.
Unit
áááááááááááááááááááááááááááá
AF output – AM:
á
áááááááááááááááááááááááááááááá
áááááááááááááááááá
f
mod
= 1kHz, 12.5kHz
á
á
áááááááááááááááááááááááááááááá
see note 1
á
ááááááááááááááááááááááááááááá
áááááááááááááááááááááááááááá
Notes:
AF output voltage, RMS
value
á
see note 10
DC
out
á
áááááááááááááááááááááááááááá
áááááááááááááááá
ááááááá
m = 54 %
áá
áá
áá
áá
áá
áá
áá
á
á
á
á
á
á
á
á
Signal to noise ratio
22 kHz low pass filter
á
á
Reference: m = 54%,
f
mod
= 1 kHz,
áá
áá
á
á
á
á
áááááááááá
áá
áá
á
á
áá
áá
á
áá
áá
á
á
áááááááááááááááááááááááááááááááá
Control voltage:
SIF input 1 active
ááááááááááááááááááááááááááááá
áááááááááááááááááááááááááááá
á
á
áá
I
SW
SW
á
áá
á
áá
100
á
áá
s
á
áá
A
á
1.
This parameter is given as an application information and not tested during production.
2.
Adjustment of turn over point (delayed tuner AGC) with external resistor R
top
or external voltage V
top
.
3.
The oscillator drift is related to picture carrier frequency, at external temperature–compensated LC
circuit
4.
(1.07) = 20 log (4.43 MHz component/1.07 MHz component);
(1.07) value related to black–white signal
input signal conditions:
picture carrier
colour carrier
sound carrier
0 dB
–6 dB
–24 dB
5.
Without external control voltage at pin 15 (open circuit) the IC automatically operates in mode :
negative modulated video IF and FM/NICAM sound signals
Voltage at Pin 15
(standard switch)
Selected standard
(mode)
áááááááááááááááááááááá
á
áááááááááááááááááááááá
á
á
SIF: AM + NICAM
áááááááááá
áááááááááá
áááááááááá
á
SIF: FM/ NICAM
á
áááááááááá
áááááááááá
áááááááááá
á
á
á
á
6.
Without control voltage at Pin 21 (open circuit) the falling AFC curve is automatically selected
Voltage at Pin 21
(AFC switch)
AFC function
áááááááááááááááááááááá
á
ááááááááááááááááááááá
áááááááááááááááááááááá
áááááá
á
áááááá
á
(or pin 21 open)
ááááááá
á
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