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參數資料
| 型號： | U4479B |
| 英文描述： | DVB-Cable IF Converter and Full Multi-Standard Video-/Sound IF Processing |
| 中文描述： | 的DVB -電纜中頻轉換器和完整的標準Video-/Sound中頻處理 |
| 文件頁數： | 8/11頁 |
| 文件大小： | 257K |
| 代理商： | U4479B |
U4479B
TELEFUNKEN Semiconductors
Rev. A2, 14-Jan-98
Preliminary Information
6 (11)
Electrical Characteristics (continued)
VS = 5 V, Tamb = +25°C
Parameters
Test Conditions / Pins
Symbol
Min.
Typ.
Max.
Unit
AFC output
Control slope
DI/Df
0.7
mA/kHz
Frequency drift by
temperature
Related to the picture
carrier frequency
0.25
0.6
%
Output voltage
upper limit
lower limit
VAFC
VS–0.4
0.4
V
Output current
IAFC
±0.2
mA
SIF input
Input sensitivity,
RMS value
Output signal: –3 dB
vin
80
120
V
Input impedance
See note 1
Rin
1.2
k
W
Input capacitance
See note 1
Cin
2
pF
SIF – AGC
IF gain control range
Gv
60
65
dB
AGC capacitor
CAGC
4.7
mF
Intercarrier output FM (see note 4)
DC output voltage
VDC
2
V
Output resistance
See note 1
Rout
150
W
Sound IF output voltage,
RMS value
5.5 MHz output voltage
vin = 10 mV
vout
200
mV
Weighted signal-to-noise
ratio: (CCIR 468)
Black screen: Channel 1/2
Grid pattern: Channel 1/2
Grey screen 50%:
Channel 1/2
Reference signal:
vin =10 mV; fmod = 1 kHz;
FM dev. =
±27 kHz
tested with the double FM
demodulator U2860B;
B/G modulated IF signal
S/N
60/58
54/52
60/57
dB
AF output AM (see note 5)
DC output voltage
VDC
2.2
V
Output resistance
See note 1
Rout
150
W
AF output voltage,
RMS value
m = 54 %
voAF
500
mV
Total harmonic distortion
m = 54%
fmod = 1kHz, 12.5kHz
THD
1
2
%
Signal-to-noise ratio
Reference:
m = 54%, fmod = 1 kHz,
22 kHz low-pass filter
S/N
65
dB
IF input switch (Pin 15)
Control voltage for
HIGH: IF1 input active
LOW: IF2 input active
See note 6
Vsw
2.5
3.5
1.5
V
Switching current
Pin 15 to ground
Isw
30
mA
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