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參數(shù)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(zhuǎn)換器和完整的標(biāo)準(zhǔn)Video-/Sound中頻處理 |
| 文件頁數(shù)： | 5/11頁 |
| 文件大?。?/td> | 257K |
| 代理商： | U4479B |
U4479B
Preliminary Information
TELEFUNKEN Semiconductors
Rev. A2, 14-Jan-98
3 (11)
Pin Description
1
2
3
4
5
6
7
8
10
9
27
22
21
20
18
19
17
12
11
28
25
26
23
24
Vi,IF1
CAGC,IF
GND
Vi,IF2
Rtop
CAGC,SIF
Vi,IF1
Itun
CRef
Vi,SIF
Vvco
GND
VLO
LF
Vtun
VAFC
VS
Vfreq
Vo,AM
Vo,FM
AGCRef
16
15
14
13
14530
Vout
Cbl
Vmod
Vsw
Figure 2. Pinning
Pin
Symbol
Function
1, 2
Vi,SIF
SIF input (symmetrical)
3
CRef
Internal reference voltage (BG)
4
CAGC,SIF
SIF-AGC (time constant)
5, 6
Vi,IF1
IF1 input (symmetrical)
7
CAGC,IF
IF-AGC (time constant)
8
GND
Ground
9, 10
Vi,IF2
IF2 input (symmetrical)
11
Rtop
Take over point, tuner AGC
12
Itun
Tuner AGC output current
13
Vout
CVBS or 2nd IF output
14
Cbl
Capacitor – black level detector
15
Vsw
IF input selector switch
16
Vmod
Modulation switch
17
Vfreq
VCO frequency switch
18
Vtun
External VCO tuning voltage
19
LF
Loop filter
20
VLO
Local oscillator output voltage
21
GND
Ground
22, 23
Vvco
VCO circuit (symmetrical)
24
Vs
Supply voltage
25
VAFC
AFC output
26
Vo,AM
AF output – AM sound
27
Vo,FM
Intercarrier output
28
AGCRef
AGC reference for DVB
operation
Absolute Maximum Ratings
Parameters
Symbol
Value
Unit
Supply voltage
VS
5.5
V
Supply current
IS
100
mA
Power dissipation, VS = 5.5 V
Ptot
550
mW
Output currents
Iout
5
mA
Junction temperature
Tj
125
°C
Storage temperature
Tstg
–25 to +125
°C
Electrostatic handling *)
VESD
tbd
V
*) Equivalent to discharging a 200-pF capacitor through a 0-
W resistor
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