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LMX2336L Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LMX2336L Datasheet(HTML) 11 Page - National Semiconductor (TI) |
11 / 22 page Functional Description (Continued) PROGRAMMABLE DIVIDER (N COUNTER) Each N counter consists of the 7-bit swallow counter (A counter) and the 11-bit programmable counter (B counter). If the Control Bits are 10 or 11 (10 for RF2 counter and 11 for RF1 counter) data is transferred from the 20-bit shift register into a 7-bit latch (which sets the Swallow (A) Counter) and an 11-bit latch (which sets the 11-bit programmable (B) Counter), MSB first. Serial data format is shown below. 7-BIT SWALLOW COUNTER DIVIDE RATIO (A COUNTER) Divide N 7 N 6 N 5 N 4 N 3 N 2 N 1 Ratio A 0 0000000 1 0000001 • ••••••• 127 1111111 Notes: Divide ratio: 0 to 127 B ≥ A A < P 11-BIT PROGRAMMABLE COUNTER DIVIDE RATIO (B COUNTER) Divide N 18 N 17 N 16 N 15 N 14 N 13 N 12 N 11 N 10 N 9 N 8 Ratio B 3 00000000011 4 00000000100 • ••••••••••• 2047 11111111111 Note: Divide ratio: 3 to 2047 (Divide ratios less than 3 are prohibited) B ≥ A PULSE SWALLOW FUNCTION f VCO = [(P xB)+ A]xfOSC/R f VCO: Output frequency of external voltage controlled oscillator (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 ≤ A ≤ P; A ≤ B) f OSC: Output frequency of the external reference frequency oscillator R: Preset divide ratio of binary 15-bit programmable reference counter (3 to 32767) P: Preset modulus of dual moduIus prescaler (P = 64 or 128) PROGRAMMABLE MODES Several modes of operation can be programmed with bits R16–R20 including the phase detector polarity, charge pump tristate and the output of the F oLD pin. The prescaler and power down modes are selected with bits N19 and N20. The programmable modes are shown in Table 1. Truth table for the programmable modes and F oLD output are shown in Table 2 and Table 3. DS012807-7 www.national.com 11 |
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