UPC2794GS データシートの表示（PDF） - NEC => Renesas Technology

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UPC2794GS

FREQUENCY DOWN CONVERTER FOR VHF TO UHF BAND TV/VCR TUNER

NEC => Renesas Technology 

µPC2794GS

PIN EXPLANATION

Pin No. Symbol

Pin Voltage TYP.

above: VHF mode

below: UHF mode

Function and Explanation

1

UOSC

collector

(Tr. 1)

6.90

Collector pin of UHF oscillator.

Assemble LC resonator with 2

6.25

pin through capacitor ~ 1 pF to

oscillate with active feedback loop.

2

UOSC

6.00

base (Tr. 2)

3.90

Base pin of UHF oscillator

with balance amplifier. Connected

to LC resonator through feedback

capacitor ~ 300 pF.

3

UOSC

6.00

base (Tr. 1)

3.90

Base pin of UHF oscillator

with balance amplifier.

Connected to LC resonator

through feedback capacitor ~ 300 pF.

4

UOSC

collector

(Tr. 2)

6.90

Collector pin of UHF oscillator

with balance amplifier. Assemble

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

—

Switching pin for VHF or UHF

operation.

9.0

VHF operation = open

UHF operation = 9.0 V

6

OSC

output

5.40

UHF and VHF oscillator output

pin. In case of F/S tuner

application, connected PLL

symthesizer IC’s input pin.

5.40

Equivalent Circuit

31

5

42

REG

6

 from





OSC

7

GND

8

VOSC

base

(Tr. 1)

9

VOSC

base

(Tr. 2)

10 VOSC

collector

(Tr. 1)

0.0

0.0

3.50

5.90

3.50

5.90

6.20

6.90

GND pin of VHF and UHF

oscillator.

Base pin of VHF oscillator.

Grounded through capacitor ~

10 pF.

Base pin of VHF oscillator.

Assemble LC resonator with

10 pin to oscillate with active

feedback loop.

Collector pin of VHF oscillator.

Connected to LC resonator

through feedback capacitor ~

3 pF.

8 10

Data Sheet P11888EJ3V0DS00

9

REG

3

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