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ADF4360-2 Scheda tecnica(PDF) 11 Page - Analog Devices |
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ADF4360-2 Scheda tecnica(HTML) 11 Page - Analog Devices |
11 / 24 page Data Sheet ADF4360-2 Rev. C | Page 11 of 24 The operating current in the VCO core is programmable in four steps: 5 mA, 10 mA, 15 mA, and 20 mA. This is controlled by Bit PC1 and Bit PC2 in the control latch. For VCO frequencies above 2 GHz, only the 15 mA core current should be used, and for frequencies below 2 GHz, only 20 mA core current should be used. OUTPUT STAGE The RFOUTA and RFOUTB pins of the ADF4360 family are connected to the collectors of an NPN differential pair driven by buffered outputs of the VCO, as shown in Figure 15. To allow the user to optimize the power dissipation vs. the output power requirements, the tail current of the differential pair is programmable via Bit PL1 and Bit PL2 in the control latch. Four current levels can be set: 3.5 mA, 5 mA, 7.5 mA, and 11 mA. These levels give output power levels of −13 dBm, −11 dBm, −8 dBm, and −6 dBm, respectively, using a 50 Ω resistor to VDD and ac coupling into a 50 Ω load. Alternatively, both outputs can be combined in a 1 + 1:1 transformer or a 180° microstrip coupler (see the Output Matching section). If the outputs are used individually, the optimum output stage consists of a shunt inductor to VDD. Another feature of the ADF4360 family is that the supply current to the RF output stage is shut down until the part achieves lock as measured by the digital lock detect circuitry. This is enabled by the mute-till-lock detect (MTLD) bit in the control latch. VCO RFOUTA RFOUTB BUFFER/ DIVIDE-BY-2 Figure 15. Output Stage ADF4360-2 |
Codice articolo simile - ADF4360-2_12 |
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Descrizione simile - ADF4360-2_12 |
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