ICS673M-01T 查看數據表（PDF） - Integrated Circuit Systems

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ICS673M-01T

PLL Building Block

Integrated Circuit Systems 

ICS673-01

PLL Building Block

Avoiding PLL Lockup (continued)

power, very small (SOT-23), low cost, and has

high input impedance.

The trigger voltage of the comparator is set by

the voltage divider formed by R2 and R3. The

voltage should be set to a value higher than the

VCO input is expected to run during normal

operation. Typically, this might be 0.5 V below

VDD. Hysteresis should be added to the circuit

by connecting resistor R4.

ICS673-01

PD

CHGP VCOIN

CAP

C2

VDD

R2

RZ

C1

-

+

R3

R4

Figure 5. Using an External Comparator to Reset the VCO.

MDS 673-01 D

8

Revision 022500

Printed 11/15/00

Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126•(408)295-9800tel • www.icst.com

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