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SM5166 Datenblatt(PDF) 7 Page - Nippon Precision Circuits Inc |
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SM5166 Datenblatt(HTML) 7 Page - Nippon Precision Circuits Inc |
7 / 11 page SM5166AV NIPPON PRECISION CIRCUITS—7 Reference counter frequency divider setting Input data example If the VCO output (fVCO) is trebled, the crystal frequency is 12.8 MHz and the channel bandwidth (fCH: comparator frequency (fR) × 3) is 25 kHz, then the reference frequency divider ratio R is given by: Therefore, the reference counter count is 192 (00011000000)2. The input data format is shown in figure 5. Figure 3. Swallow counter and main counter frequency divider data example Input Data 12 345 678 9 10 11 12 13 14 15 16 17 MSB LSB 22 222 222 22 222 222 10 9 876 543 21 043 210 Main counter (11-bit : 32 to 2047) Swallow counter (5-bit : 0 to 31) Latch selection bit : Set to "0" 00 100 111 01 000 100 0 Figure 4. Reference counter data and LD output setting format DATA 12 345 678 9 10 11 12 13 14 15 16 17 MSB LSB 22 222 222 22 222 12 11 10 98 765 43 210 (Reference counter 13-bit : 5 to 8191) Latch selection bit : Set to "1" Test bits : (15, 16) = (0, 0) for normal operation LD output setting bit∗ ∗ : Normal operation when 1, LOW-level output when 0. NR Xtal f CH ----------- Xtal f R 3 × --------------- 12.8 0.025 3 ⁄ -------------------- 1536 8 192 × == = = = |
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