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UPC2794GS ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 3 Page - NEC

๋ถ€ํ’ˆ๋ช… UPC2794GS
์ƒ์„ธ๋‚ด์šฉ  FREQUENCY DOWN CONVERTER FOR VHF TO UHF BAND TV/VCR TUNER
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UPC2794GS ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 3 Page - NEC

 
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ยตPC2794GS
3
Data Sheet P11888EJ3V0DS00
PIN EXPLANATION
Pin Voltage TYP.
Pin No.
Symbol
above: VHF mode
Function and Explanation
Equivalent Circuit
below: UHF mode
1
UOSC
6.90
Collector pin of UHF oscillator.
collector
Assemble LC resonator with 2
(Tr. 1)
6.25
pin through capacitor ~ 1 pF to
oscillate with active feedback loop.
2
UOSC
6.00
Base pin of UHF oscillator
base (Tr. 2)
with balance amplifier. Connected
3.90
to LC resonator through feedback
capacitor ~ 300 pF.
3
UOSC
6.00
Base pin of UHF oscillator
base (Tr. 1)
with balance amplifier.
3.90
Connected to LC resonator
through feedback capacitor ~ 300 pF.
4
UOSC
6.90
Collector pin of UHF oscillator
collector
with balance amplifier. Assemble
(Tr. 2)
LC resonator with 3 pin through
capacitor ~ 1 pF to oscillate with
6.25
active feedback loop.
Double balanced oscillator with
transistor 1 and transistor 2.
5
UB
โ€”
Switching pin for VHF or UHF
operation.
9.0
VHF operation = open
UHF operation = 9.0 V
6
OSC
5.40
UHF and VHF oscillator output
output
pin. In case of F/S tuner
application, connected PLL
symthesizer ICโ€™s input pin.
5.40
7
GND
0.0
GND pin of VHF and UHF
0.0
oscillator.
8
VOSC
3.50
Base pin of VHF oscillator.
base
Grounded through capacitor ~
(Tr. 1)
5.90
10 pF.
9
VOSC
3.50
Base pin of VHF oscillator.
base
Assemble LC resonator with
(Tr. 2)
5.90
10 pin to oscillate with active
feedback loop.
10
VOSC
6.20
Collector pin of VHF oscillator.
collector
Connected to LC resonator
(Tr. 1)
6.90
through feedback capacitor ~
3 pF.
9
8
REG
10
6
๏ฃผ
๏ฃฝ
๏ฃพ
from
OSC
REG
4
2
1
3
5


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