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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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STW81101ATR 데이터시트(PDF) 32 Page - STMicroelectronics |
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STW81101ATR 데이터시트(HTML) 32 Page - STMicroelectronics |
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32 / 48 page  I2C bus interface STW81101 32/48 6.4 VCO calibration procedure Calibration of the VCO center frequency is activated when the SERCAL bit (CALIBRATION register bit[6]) transitions from 0 to 1. To program the device properly while ensuring VCO calibration, perform the following steps before every channel change: 1. Program all the registers using a multi-byte write sequence with the desired settings (functional mode, B and A counters, R counter, VCO amplitude, charge pump, prescaler modulus), and all the bits of the CALIBRATION register (05H) set to 0. 2. Program the CALIBRATION register using a single-byte write sequence (subaddress 05H) with the SERCAL bit set to 1. 3. The maximum allowed PFD frequency (FPFD) during calibration is 1 MHz; if you want a FPFD higher than 1 MHz, perform the following additional steps: a) Perform all the steps of the calibration procedure, making sure to program the desired VCO frequency with proper settings for the R, B and A counters so that FPFD is ≤1 MHz. b) Program the device with the desired VCO and PFD frequency settings according to step 1) above. |
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