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4 / 10 page ST49C101A-XX 4 Rev. 2.20 MULTIPLICATION FACTOR AND OUTPUT FRE- QUENCY SELECTION The ST49C101A-XX contains an analog phase locked loop (PLL) circuit with digital closed loop dividers and a final output divider to achieve the desired dividing ratios for the clock output. The preprogrammed multi- plication factor and output frequency are shown on Table 1. The accuracy of the output frequency pro- duced by the ST49C101A-XX depends on its input frequency and multiplication factor. APPLICATIONS Two application examples are shown in Figure 2 and 3. Figure 2 shows a lower cost high frequency crystal oscillator circuit using the ST49C101-xx to increase the fundamental crystal frequency. The crystal Y1 is connected to XTAL1 and XTAL2 pins to use the internal oscillator circuit. The oscillator provides the reference clock to the PLL circuit for clock rate multi- plication. Figure 3 shows a similar circuit using external clock input on XTAL1 pin instead. If a sinewave is used for external clock, it may be necessary to AC couple the signal with a 0.047uF capacitor to XTAL1 pin so that the internal circuitry can establish the proper bias. Also, keep the peak-to- peak signal, at XTAL pin, above ground level (AGND) and below AVCC. As a general board layout rule, it is recommended to use two 0.01 µF bypass capacitors on DVCC and AVCC power supply pins, and put them as closely as possible to the chip. Notes 1See AC electrical characteristics for maximum operating frequency. X X - A 1 0 1 C 9 4 T Sr o t c a F t u p t u O . x a M y c n e u q e r F 1 C C V 1 1 0 - A 1 0 1 C 9 4 T S2 1 z H M 0 0 2 z H M 0 4 1 V 0 . 5 V 3 . 3 3 0 - A 1 0 1 C 9 4 T S8 z H M 0 0 2 z H M 0 4 1 V 0 . 5 V 3 . 3 5 0 - A 1 0 1 C 9 4 T S6 z H M 0 0 2 z H M 0 4 1 V 0 . 5 V 3 . 3 6 0 - A 1 0 1 C 9 4 T S4 z H M 0 2 1 r o 0 . 5 V 3 . 3 7 0 - A 1 0 1 C 9 4 T S3 z H M 0 8 z H M 0 7 V 0 . 5 V 3 . 3 8 0 - A 1 0 1 C 9 4 T S2 z H M 0 8 z H M 0 7 V 0 . 5 V 3 . 3 9 0 - A 1 0 1 C 9 4 T S5 z H M 0 0 2 z H M 0 4 1 V 0 . 5 V 3 . 3 0 1 - A 1 0 1 C 9 4 T S0 1z H M 0 8 1V 3 . 3 3 1 - A 1 0 1 C 9 4 T S8 z H M 0 8 1V 3 . 3 5 1 - A 1 0 1 C 9 4 T S6 z H M 0 8 1V 3 . 3 Table 1. Preprogrammed Options |
Số phần tương tự - ST49C101ACF8-03 |
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Mô tả tương tự - ST49C101ACF8-03 |
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