ICS307-03
SERIALLY PROGRAMMABLE CLOCK SOURCE
SER PROG CLOCK SYNTHESIZER
Determining and Controlling the Output Frequency with VersaClock
TM
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.icst.com or send an e-mail to ics-mk@icst.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:
V
CLK1Frequency
=
InputFrequency
⋅
--------------------
R
⋅
OD
Also, the following operating ranges should be observed.
V
VCOmin
<
InputFrequency
⋅
--- <
VCOmaxfreq
-
R
Input Frequency
20kHz < ------------------------------------------ < 100MHz
-
R
Where:
VCO Divider (V) = 12 to 2055
Reference Divider Word (R) = 1 to 2055
Output Divider = values in tables 5, 6, 7
To determine the best combination of VCO, reference, and
output dividers, please use the VersaClock II software
mentioned above.
Default Register Values
At power-up, the registers are set to:
ref divide = 5
VCO divide = 50
output divide = 10 (CLK1)
output divide = 2 (CLK2)
output divide = 2 (CLK3)
bit 123, 124 = 1
ICP = 3.75 µA
R = 16k
Default programming word is:
0x31FFDFFEE3BFFFFFFFFFFFFFFFF055FF2
IDT™ / ICS™
SERIALLY PROGRAMMABLE CLOCK SOURCE
8
ICS307-03
REV J 090209
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
