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AN2452 Datasheet(PDF) 4 Page - STMicroelectronics |
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AN2452 Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 21 page Software AN2452 4/21 Figure 1. Main form 6. Swallow counter A: 5-bit counter. 7. VCO calibrator: – Last calibration Fvco: contains the last calibration data (VCO and frequency of calibration). – Calibrator ON/OFF. – The maximum allowed Fpfd during calibration is 1 MHz. If Fpfd > 1 MHz, the device is programmed in two steps: a) Device is programmed forcing calibration with the maximum Fpfd ≤1MHz (Fpfd = Fref / R ≤1 MHz ==> R ≥ Fref / 10 6). b) Device is programmed with the desired Fpfd. Example with Fref = 76.8 MHz: Desired values: - Fpfd = 1200 kHz - R = Fref / Fpfd = 64 Forced values: - R' = ⎡Fref / 106⎤ = ⎡76.8⎤ = 77 - F'pfd = Fref / R' = 997.403 kHz Device programming in two steps: a) Device is programmed with Fpfd = 997.403 kHz and Calibrator ON. b) Device is programmed with Fpfd = 1200 kHz and Calibrator OFF. 1 2 3 4 5 6 78 9 10 11 12 13 16 15 14 17 18 19 20 21 |
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