| I D = 0.25 . | j| | f f | |
| D = 0.33 \ | | Fj | |
| I | | c | |
| RMt | | | | |
| | | ÷ | | |
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| j | | | | |
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RR1220P-124-D on stock The MICRF501 circuit has a lock detector feature that indi- cates whether the PLL is in lock or not. A logic high on Pin 15 (LOCKDET) means that the PLL is in lock. The phase detector output is converted into a voltage that is filtered by the external capacitor C23, connected to Pin 14, LDC. The resulting DC voltage is compared to a reference window set by bits Ref0- Ref5.The reference window can be stepped up/down linearly between OV, Ref0 - Ref5 =1, and Ref0 - Ref5 = 0, which gives the highest value (DC voltage) of the reference window.The size of the window can either be
