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LMX233XA Datasheet(PDF) 10 Page - National Semiconductor (TI) |
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LMX233XA Datasheet(HTML) 10 Page - National Semiconductor (TI) |
10 / 17 page Functional Description The simplified block diagram below shows the 22-bit data register, two 15-bit R Counters and the 15- and 18-bit N Counters (in- termediate latches are not shown). The data stream is clocked (on the rising edge of Clock) into the DATA register, MSB first. The data stored in the shift register is loaded into one of 4 appropriate latches on the rising edge of LE. The last two bits are the Con- trol Bits. The DATA is transferred into the counters as follows: Control Bits DATA Location C1 C2 0 0 IF R Counter 0 1 RF R Counter 1 0 IF N Counter 1 1 RF N Counter PROGRAMMABLE REFERENCE DIVIDERS (IF AND RF R COUNTERS) If the Control Bits are 00 or 01 (00 for IF and 01 for RF) data is transferred from the 22-bit shift register into a latch which sets the 15-bit R Counter. Serial data format is shown below. 15-BIT PROGRAMMABLE REFERENCE DIVIDER RATIO (R COUNTER) Divide Ratio R 15 R 14 R 13 R 12 R 11 R 10 R 9 R 8 R 7 R 6 R 5 R 4 R 3 R 2 R 1 3 0000000 00000011 4 0000000 00000100 • ••••••• •••••••• 32767 1111111 11111111 Notes: Divide ratios less than 3 are prohibited. Divide ratio: 3 to 32767 R1 to R15: These bits select the divide ratio of the programmable reference divider. Data is shifted in MSB first. DS012331-1 DS012331-14 www.national.com 10 |
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