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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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STW82102B 데이터시트(PDF) 29 Page - STMicroelectronics |
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STW82102B 데이터시트(HTML) 29 Page - STMicroelectronics |
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29 / 67 page  STW82102B General description Doc ID 018516 Rev 2 29/67 VCO calibration auto-restart feature The VCO Calibration Auto-Restart feature, once activated, allows the calibration procedure to be restarted when the Lock Detector reports that the PLL has moved to an unlock condition (trigger on ‘1’ to ‘0’ transition of Lock Detector signal). This situation could happen if the device experiences a significant temperature variation and the CALTYPE bit is set for optimum PLL phase noise performance (CALTYPE [0]). By enabling the VCO Calibration Auto-Restart feature (through the AUTO_CAL bit), the device re-selects the proper VCO frequency sub-range, without any external user command. This feature can be enabled only when the FPFD is lower than 1 MHz. VCO voltage amplitude control The voltage swing of the VCOs can be adjusted over 4 levels by means of two dedicated programming bits (PLL_A1 and PLL_A0). This setting trades current consumption with phase noise performances of the VCO. Higher amplitudes provide best phase noise while lower ones save power. |
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