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ICS307G-03LF Datasheet(PDF) 8 Page - Integrated Circuit Systems |
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ICS307G-03LF Datasheet(HTML) 8 Page - Integrated Circuit Systems |
8 / 12 page SERIALLY PROGRAMMABLE CLOCK SOURCE MDS 307-03 C 8 Revision 101705 In te gr ated Circuit Systems ● 525 Ra ce Street, San Jose, CA 9512 6 ● tel (4 08) 297 -1 201 ● www.icst.com ICS307-03 Initial Output Frequency ICS307-03 on-chip registers are initially configured to provide a 1x output clock on the CLK1 output, and 0.5x clock on CLK2 and CLK3. The output frequency will be the same as the input clock or crystal for input frequencies from 10 - 50 MHz. This is useful when the ICS307-03 needs to provide an initial system clock at power-up. Determining and Controlling the Output Frequency with VersaClockTM II The ICS307-03 is directly supported by the ICS 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: 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. If more information is needed, please contact ICS by sending an e-mail to ics-mk@icst.com. CLK1Frequency InputFrequency V ROD ⋅ ------------------ ⋅ = VCOmin InputFrequency V R ---- VCOmaxfreq < ⋅ < 20kHz Input Frequency R -------------------------------------------100MHz << |
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