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ADF4007 Folha de dados(PDF) 10 Page - Analog Devices |
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ADF4007 Folha de dados(HTML) 10 Page - Analog Devices |
10 / 16 page ADF4007 Rev. 0 | Page 10 of 16 MUXOUT The output multiplexer on the ADF4007 allows the user to access various internal points on the chip. The state of MUXOUT is controlled by the M2 and M1 pins. Figure 12 shows the MUXOUT section in block diagram form. DGND DVDD CONTROL MUX DVDD R COUNTER OUTPUT N COUNTER OUTPUT DGND MUXOUT Figure 12. MUXOUT Circuit PFD Polarity The PFD polarity is set by the state of M2 and M1 pins as given in the Table 5. The ability to set the polarity allows the use of VCOs with either positive or negative tuning characteristics. For standard VCOs with positive characteristics (output frequency increases with increasing tuning voltage), the polarity should be set to positive. This is accomplished by tying M2 and M1 to a logic low state. CP Output The CP output state is also controlled by the state of M2 and M1. It can be set either to active (so that the loop can be locked) or to three-state (open the loop). The normal state is CP output active. |
Nº de peça semelhante - ADF4007 |
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Descrição semelhante - ADF4007 |
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