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參數(shù)資料
| 型號(hào)： | μPC2743GS |
| 廠商： | NEC Corp. |
| 英文描述： | Frequecy Down Converter For VHF-UHF Band TV/VCR Tuner(應(yīng)用于VHF-UHF調(diào)諧器的下變頻轉(zhuǎn)換器) |
| 中文描述： | Frequecy下變頻器甚高頻，超高頻波段電視/錄像機(jī)調(diào)諧器（應(yīng)用于甚高頻，超高頻調(diào)諧器的下變頻轉(zhuǎn)換器） |
| 文件頁數(shù)： | 3/16頁 |
| 文件大小： | 91K |
| 代理商： | ΜPC2743GS |
3
μ
PC2743GS/
μ
PC2744GS
Data Sheet P10192EJ3V0DS00
PIN EXPLANATION
Pin voltage TYP.
above: V mode (V)
below: U mode (U)
Pin No.
Symbol
1
UOSC
collector
(Tr. 1)
—
8.3
2
UOSC
bace (Tr. 2)
—
4.6
3
UOSC
base (Tr. 1)
—
4.6
4
UOSC
collector
(Tr. 2)
—
8.3
5
UB
—
9.0
6
OSC
output
4.4
4.5
7
OSC
GND
0.0
0.0
8
VOSC
collector
9
VOSC
base
2.5
4.9
10
VOSC
collector
5.1
5.8
11
VB
5.8
5.8
Function and Explanation
Equivalent circuit
Collector pin of UHF oscillator.
Assemble LC resonator with 2 pin through
capacitor ~ 1 pF to oscillate with active
feedback Loop.
Base pin of UHF oscillator with
balance amplifier. Connected to LC
resonator through feedback capacitor
~ 300 pF.
Base pin of UHF oscillator with
balance amplifier. Connected to LC
resonator through feedback capacitor
~ 300 pF.
Collector pin of UHF oscillator with
balance amplifier. Assemble LC
resonator with 3 pin through capacitor ~ 1
pF to oscillate with active feedback Loop.
Double balanced oscillator with transistor
1 and transistor 2.
Switching pin for VHF or UHF operation.
UHF operation = 9.0 V
VHF operation = Open
UHF and VHF oscillator output pin.
In case of F/S tuner application, con-
nected PLL symthesizer IC’s input pin.
VHF and UHF oscillators’ GND pin.
Base pin of VHF oscillator with balance
amplifier.
Grounded through capacitor
~
10 pF.
Base pin of VHF oscillator with balance
amplifier. Assemble LC resonator with
10 pin to oscillate with active feedback
Loop.
Base pin of VHF oscillator with balance
amplifier. Connected to LC resonator
through feedback capacitor ~ 3 pF.
Monitor pin of regulator output
voltage.
1
2
3
4
5
REG.
From
OSC
6
11
REG.
8
9
10
11
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