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LMX2320 Datasheet(PDF) 10 Page - National Semiconductor (TI) |
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LMX2320 Datasheet(HTML) 10 Page - National Semiconductor (TI) |
10 / 22 page Functional Description The simplified block diagram below shows the 19-bit data register the 14-bit R Counter and the S Latch and the 18-bit N Counter (intermediate latches are not shown) The data stream is clocked (on the rising edge) into the DATA input MSB first If the Control Bit (last bit input) is HIGH the DATA is transferred into the R Counter (programmable reference divider) and the S Latch (prescaler select LMX2315 and LMX2320 6465 or 128129 LMX2325 3233 or 6465) If the Control Bit (LSB) is LOW the DATA is transferred into the N Counter (programmable divider) TLW12339 – 18 PROGRAMMABLE REFERENCE DIVIDER (R COUNTER) AND PRESCALER SELECT (S LATCH) If the Control Bit (last bit shifted into the Data Register) is HIGH data is transferred from the 19-bit shift register into a 14-bit latch (which sets the 14-bit R Counter) and the 1-bit S Latch (S15 which sets the prescaler 6465 or 128129 for the LMX231520 or 3233 or 6465 for the LMX2325) Serial data format is shown below TLW12339 – 6 14-BIT PROGRAMMABLE REFERENCE DIVIDER RATIO (R COUNTER) Divide 14 S 13 S 12 S 11 S 10 SS 9 S 8 S 7 S 6 S 5 S 4 S 3 S 2 S 1 Ratio R 3 0 0000 0 0 0 000011 4 0 0000 0 0 0 000100 16383 1 1111 1 1 1 111111 Notes Divide ratios less than 3 are prohibited Divide ratio 3 to 16383 S1 to S14 These bits select the divide ratio of the programmable reference divider C Control bit (set to HIGH level to load R counter and S Latch) Data is shifted in MSB first Prescaler Select 15 S LMX231520 LMX2325 128129 6465 0 6465 3233 1 http www nationalcom 10 |
Similar Part No. - LMX2320 |
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Similar Description - LMX2320 |
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