ICS307-03

SERIALLY PROGRAMMABLE CLOCK SOURCE

SER PROG CLOCK SYNTHESIZER

IDT® SERIALLY PROGRAMMABLE CLOCK SOURCE

8

ICS307-03

REV L 032911

Determining and Controlling the Output Frequency with VersaClockTM II

The ICS307-03 is directly supported by the IDT provided

software called VersaClock II. Complete programming

words for this device can be calculated on any Windows PC

by running the VersaClock II software and simple inputting

desired input and output frequencies. Once the software

generates an appropriate programming word, it may then be

either copied to the Windows clipboard or even directly

programmed into the ICS307-03 via the host computers

parallel port.

For more information on VersaClock II, please visit

www.idt.com.

Manually Determining the Output Frequency

The user has full control over the desired output frequency

as long as it is operated within the limits shown in the AC

Electrical Characteristics.

The output of the ICS307-03 can be determined by the

following equation:

Where:

VCO Divider (V) = 12 to 2055

Reference Divider Word (R) = 1 to 2055

Output Divider = values in tables 5, 6, 7

Also, the following operating ranges should be observed.

To determine the best combination of VCO, reference, and

output dividers, please use the VersaClock II software

mentioned above.

CLK1Frequency

InputFrequency

V

ROD

⋅

--------------------

⋅

=

VCOmin

InputFrequency

V

R

----

VCOmaxfreq

<

⋅

<

20kHz

Input Frequency

R

-------------------------------------------100MHz

<<