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LMX2320TM bảng dữ liệu(PDF) 11 Page - National Semiconductor (TI) |
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LMX2320TM bảng dữ liệu(HTML) 11 Page - National Semiconductor (TI) |
11 / 22 page Functional Description (Continued) PROGRAMMABLE DIVIDER (N COUNTER) The N counter consists of the 7-bit swallow counter (A counter) and the 11-bit programmable counter (B counter) If the Control Bit (last bit shifted into the Data Register) is LOW data is transferred from the 19-bit shift register into a 7-bit latch (which sets the 7-bit Swallow (A) Counter) and an 11-bit latch (which sets the 11-bit programmable (B) Counter) Serial data format is shown below TLW12339 – 20 Note S8 to S18 Programmable counter divide ratio control bits (3 to 2047) 7-BIT SWALLOW COUNTER DIVIDE RATIO (A COUNTER) Divide S 7 S 6 S 5 S 4 S 3 S 2 S 1 Ratio A 0 0000000 1 0000001 127 1111111 Note Divide ratio 0 to 127 B t A 11-BIT PROGRAMMABLE COUNTER DIVIDE RATIO (B COUNTER) Divide 18 S 17 S 16 S 15 S 14 S 13 S 12 S 11 S 10 SS 9 S 8 Ratio B 3 0 00000000 1 1 4 0 00000001 0 0 2047 1 1 1 1 1 1 1 1 1 1 1 Note Divide ratio 3 to 2047 (Divide ratios less than 3 are prohibited) B t A PULSE SWALLOW FUNCTION fVCO e (P c B) a A c fOSC R fVCO Output frequency of external voltage controlled oscil- lator (VCO) B Preset divide ratio of binary 11-bit programmable counter (3 to 2047) A Preset divide ratio of binary 7-bit swallow counter (0 s A s 127 A s B) fOSC Output frequency of the external reference frequency oscillator R Preset divide ratio of binary 14-bit programmable ref- erence counter (3 to 16383) P Preset modulus of dual moduIus prescaler (64 or 128 for 231520 or 32 or 64 for 2325) http www nationalcom 11 |
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