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ADF5002BCPZ Fiches technique(PDF) 8 Page - Analog Devices |
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ADF5002BCPZ Fiches technique(HTML) 8 Page - Analog Devices |
8 / 12 page ADF5002 Rev. 0 | Page 8 of 12 ADF5002 PRESCALER VDD1 RFOUT VDD2 ADF4156 PLL RFINA 10pF 0.1µF CP 220Ω 330Ω 1.8nF 47nF 1kΩ RFIN APPLICATION CIRCUIT The ADF5002 can be connected either single-ended or differ- entially to any of the Analog Devices PLL family of ICs. It is recommended that a differential connection be used for best performance and to achieve maximum power transfer. The application circuit shown in Figure 10 shows the ADF5002 used as the RF prescaler in a microwave 16 GHz PLL loop. The ADF5002 divides the 16 GHz RF signal down to 2 GHz, which is input differentially into the ADF4156 PLL. An active filter topology, using the OP184 op amp, is used to provide the wide tuning ranges typically required by microwave VCOs. The positive input pin of the OP184 is biased at half the ADF4156 charge pump supply (VP). This can be easily achieved using a simple resistor divider, ensuring sufficient decoupling close to the +IN A pin of the OP184. This configuration, in turn, allows the use of a single positive supply for the op amp. Alternatively, to optimize performance by ensuring a clean bias voltage, a low noise regulator such as the ADP150 can be used to power the resistor divider network or the +IN A pin directly. RFOUT RFINB GND 820pF 1.8nF MICROWAVE VCO RFOUT VTUNE 37Ω 150Ω 150Ω 1µF VP/2 18Ω 6dB ATTENUATION PAD 18Ω 16GHz OUT DECOUPLING INTEGRATED OP184 OP AMP Figure 10. ADF5002 Used as the RF Prescaler in a Microwave 16 GHz PLL Loop |
Numéro de pièce similaire - ADF5002BCPZ |
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