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STW81101ATR 数据表(PDF) 21 Page - STMicroelectronics |
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STW81101ATR 数据表(HTML) 21 Page - STMicroelectronics |
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21 / 48 page  STW81101 Circuit description 21/48 Note: The current is output on pin ICP. During VCO auto calibration, the ICP and VCTRL pins are forced to VDD/2 Figure 18. Loop filter connection Table 7. Current value vs. selection CPSEL2 CPSEL1 CPSEL0 Current Value for REXT=4.7 K Ω 00 0 IMIN 0.5 mA 00 1 2*IMIN 1.0 mA 01 0 3*IMIN 1.5 mA 01 1 4*IMIN 2.0 mA 10 0 5*IMIN 2.5 mA 10 1 6*IMIN 3.0 mA 11 0 7*IMIN 3.5 mA 11 1 8*IMIN 4.0 mA Charge Pump VDD BUF VCTRL R3 C2 C1 Cal bit BUF C3 ICP R1 |
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