UPC8126K datasheet(8/20 Pages) NEC

8 / 20 page

Preliminary Data Sheet

µµµµPC8139GR-7JH

PIN FUNCTIONS

No.

Symbol

Applied

Voltage

(V)

Voltage

Note

(V)

Function and Description

Internal Equivalent Circuit

VCC/2

–

Input pin for I signal. The input

impedance is about 180 k

Ω.

2Ib

VCC/2

–

Input pin for Ib signal. The input

impedance is about 180 k

Ω. Single

ended input is also possible. In the

case of single ended input, input only

the DC voltage of Vcc/2.

2.2 k

Ω

470

Ω

470

Ω

VCC/2

–

Input pin for Q signal. The input

impedance is about 180 k

Ω.

4Qb

VCC/2

–

Input pin for Qb signal. The input

impedance is about 180 k

Ω. Single

ended input is also possible. In the

case of single ended input, input only

the DC voltage of Vcc/2.

2.2 k

Ω

470

Ω

470

Ω

5VCC1

2.7 to

4.0

–

Power supply voltage pin for the

quadrature modulator block.



GND1

–

Ground pin for the quadrature

modulator block. Form as wide a

ground pattern as possible to minimize

its impedance.



7VCC2

2.7 to

4.0

–

Power supply voltage pin for the VCO

block.



VCOout

–

1.6

Oscillator output pin. The output level

can be adjusted with an external pull-

down resistor.

GND2

–

Ground pin for the VCO block. Form

as wide a ground pattern as possible

to minimize its impedance.



VCO_E

–

2.1

Emitter pin for oscillator. Ground with

an external pull-down resistor. It can

be oscillated by performing feedback

with a resonance circuit mounted

externally between this pin and Pin 11.

VCO_B

–

2.9

Base pin for oscillator. It can be

oscillated by performing feedback with

a resonance circuit mounted externally

between this pin and Pin 10.

VCO_C

2.7 to

4.0

–

Collector pin for oscillator. Open

collector.

: External attachment

Note The pin voltage is measured on Vcc=3.0 V.

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