UPC2794GS datasheet(3/20 Pages) NEC

3 / 20 page

µPC2794GS

Data Sheet P11888EJ3V0DS00

PIN EXPLANATION

Pin Voltage TYP.

Pin No.

Symbol

above: VHF mode

Function and Explanation

Equivalent Circuit

below: UHF mode

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.

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.

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.

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.

—

Switching pin for VHF or UHF

operation.

9.0

VHF operation = open

UHF operation = 9.0 V

OSC

5.40

UHF and VHF oscillator output

output

pin. In case of F/S tuner

application, connected PLL

symthesizer IC’s input pin.

5.40

GND

0.0

GND pin of VHF and UHF

0.0

oscillator.

VOSC

3.50

Base pin of VHF oscillator.

base

Grounded through capacitor ~

(Tr. 1)

5.90

10 pF.

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.

VOSC

6.20

Collector pin of VHF oscillator.

collector

Connected to LC resonator

(Tr. 1)

6.90

through feedback capacitor ~

3 pF.

REG







from

OSC

REG

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