UPC2797 데이터 시트보기 (PDF) - NEC => Renesas Technology

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UPC2797

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

NEC => Renesas Technology 

µPC2797GR

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 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 (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

5.85

UHF and VHF oscillator output

pin. In case of F/S tuner

application, connected PLL

symthesizer IC’s input pin.

Grounded through 1.5 kΩ

5.85

resistor.

Equivalent Circuit

31

5

42

6

1.5 k

REG

 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

* External element

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

9

REG

Data Sheet P11889EJ3V0DS00

3

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