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LMX2323 Datasheet(PDF) 10 Page - National Semiconductor (TI) |
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LMX2323 Datasheet(HTML) 10 Page - National Semiconductor (TI) |
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10 / 12 page  2.0 Programming Description (Continued) 2.3.1 5-Bit Swallow Counter Divide Ratio (A Counter) Swallow Count NA_CNTR (A) 43210 0 00000 1 00001 • ••••• 31 11111 Notes: Swallow Counter Value: 0 to 31 NB_CNTR ≥ NA_CNTR 2.3.2 10-Bit Programmable Counter Divide Ratio (B Counter) NB_CNTR Divide Ratio 9876543210 3 0000000011 4 0000000100 • •••••••••• 1023 1111111111 Notes: Divide ratio: 3 to 1,023 (Divide ratios less than 3 are prohibited). NB_CNTR ≥ NA_CNTR 2.3.3 Pulse Swallow Function The N divider counts such that it divides the VCO RF frequency by (P+1) A times, and then divides by P (B - A) times. The B value (NB_CNTR) must be ≥ 3. The continuous divider ratio is from 992 to 32,767. Divider ratios less than 992 are achievable as long as the binary counter value is greater than the swallow counter value (NB_CNTR ≥ NA_CNTR). f VCO =Nx(fOSC/R) N=(P x B) + A f VCO: Output frequency of external voltage controlled oscillator (VCO) f OSC: Output frequency of the external reference frequency oscillator R: Preset divide ratio of binary 10-bit programmable reference counter (2 to 1023) N: Preset divide ratio of main 15-bit programmable integer N counter (992 to 32,767) B: Preset divide ratio of binary 10-bit programmable B counter (3 to 1023) A: Preset value of binary 5-bit swallow A counter (0 ≤ A ≤ 31, A ≤ B) P: Preset modulus of dual modulus prescaler (P = 32) 2.3.4 CTL_WORD MSB LSB N2 N1 CNT_RST PWDN 2.3.4.1 Reserve Word Truth Table CE CNT_RST PWDN Function 1 0 0 Normal Operation 1 0 1 Synchronous Powerdown 1 1 0 Counter Reset 1 1 1 Asynchronous Powerdown 0 X X Asynchronous Powerdown Notes: X denotes don’t care. 1. The Counter Reset bit when activated allows the reset of both N and R counters. Upon powering up the N counter resumes counting in “close” alignment with the R counter. (The maximum error is one prescaler cycle). www.national.com 10 |
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