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SM5165AV Fiches technique(PDF) 7 Page - Nippon Precision Circuits Inc |
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SM5165AV Fiches technique(HTML) 7 Page - Nippon Precision Circuits Inc |
7 / 10 page SM5165AV NIPPON PRECISION CIRCUITS—7 Reference counter frequency divider setting Bits 1 to 7 and bits 21 and 22 have no meaning. These bits should be set to 0. Bits 8 and 9 are used for testing at the manufacturers and should be set to 1 and 0, respectively, for normal operation. Input data example If the VCO output is (fVCO) trebled, the crystal oscillator 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. Boost-up Signal No meaning 12 345 678 9 10 11 12 13 14 15 16 17 MSB DATA 18 19 20 21 22 23 LSB 222 222 22 222 10 98 765 43 210 Reference counter (11-bit : 5 to 8191) Latch select bit. Set "0" Test bits No meaning NR Xtal f CH ----------- Xtal f R 3 × --------------- 12.8 0.025 3 ⁄ -------------------- 1536 8 192 × == = = = 12 345 678 9 10 11 12 13 14 15 16 17 MSB 18 19 20 21 22 23 LSB 222 222 22 222 10 98 765 43 210 00 000 001 00 001 100 0 00 000 0 Input Data No meaning Reference counter (11-bit : 5 to 8191) Latch select bit. Set "0" Test bits No meaning When the PLL starts up with some phase tolerance, a level signal is output on pin DB. When the PLL phase error comes within the tolerance before in lock, output DB goes high impedance. When the PLL starts up, the signal on DB charges the low-pass filter capacitor in anticipation of high- speed locking. After the boost-up signal is output and the PLL phase error comes within tolerance, the boost-up circuit stops and operation continues when the 3 supplies (VDD1, VDD2) are applied and OPR goes HIGH once only. After the boost-up circuit stops, new data is written and the boost-up signal is not output even if the VCO is not in lock. FR FV Phase detector error correction signal WINDOWN DB ∗∗ ∗ ∗ (High impedance) (High impedance) (HIGH level output) : 32fFIN ∗ () |
Numéro de pièce similaire - SM5165AV |
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Description similaire - SM5165AV |
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