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AS3524 датащи(PDF) 93 Page - ams AG |
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AS3524 датащи(HTML) 93 Page - ams AG |
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93 / 124 page ![]() AS3524 C21 / C22 austriamicrosystems Data Sheet, Confidential © 2003-2006, austriamicrosystems AG, 8141 Unterpremstaetten, Austria-Europe. All Rights Reserved. www.austriamicrosystems.com Revision 1.11 93 - 124 5.3.14.4 PLL description • runs on single power supply at 1.2 V (special power PADs are used within the chip layout to guarantee lowest jitter: vddapll, vssapll which are connected to vdd_core, vss_core within the BGA substrate) • fully integrated with internal loop filter • VCO operating frequency from 200 - 400 MHz • phase comparator input frequency from 2 - 8 MHz • low power dissipation of typical 2.5 mW Figure 39 PLL block diagram Programming and calculation of the PLL output frequency The output frequency is controlled by three programmable dividers within the PLL. These dividers are: the input divider NR, the feedback divider NF and the output divider NO. The divider settings are programmed by bits within CGU_PLLA, CGU_PLLB registers. The table on the following page gives the detailed formulas for setting the PLL output frequency. |
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