HEC4750VF データシートの表示（PDF） - Philips Electronics

部品番号

コンポーネント説明

メーカー

HEC4750VF

Frequency synthesizer

Philips Electronics 

Philips Semiconductors

Frequency synthesizer

In this way suitable comparison frequencies can be

obtained from a range of crystal frequencies. The divider

can also be used as a ‘stand alone’ programmable divider

by connecting input TRA to VDD, which causes all internal

analogue currents to be switched off.

Biasing circuitry

The biasing circuitry uses an external current source or

resistor, which has to be connected between the TRA and

VSS pins. This circuitry supplies all analogue parts of the

circuit. Consequently the analogue properties of the

device, such as gain, charge currents, speed, power

dissipation, impedance levels etc., are mainly determined

by the value of the input current at TRA. The TRA input

must be decoupled to VDD, as shown in Fig.7. The value of

CD has to be chosen such that the TRA input is ‘clean’, e.g.

10 nF at RA = 68 kΩ.

Product specification

HEF4750V

LSI

Fig.7 Decoupling of input TRA.

RATINGS

Limiting values in accordance with the Absolute Maximum System (IEC 134)

Supply voltage

VDD

Voltage on any input

VI

D.C. current into any input or output

±I

Power dissipation per package

for Tamb = 0 to + 85 °C

Power dissipation per output

for Tamb = 0 to 85 °C

Storage temperature

Operating ambient temperature

Ptot

P

Tstg

Tamb

−0,5 to + 15 V

−0,5 to VDD + 0,5 V

max.

10 mA

max.

500 mW

max.

100 mW

−65 to + 150 °C

−40 to + 85 °C

January 1995

8

Share Link: