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ADF5001 Folha de dados(PDF) 8 Page - Analog Devices |
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ADF5001 Folha de dados(HTML) 8 Page - Analog Devices |
8 / 12 page ADF5001 Rev. 0 | Page 8 of 12 APPLICATION CIRCUIT The ADF5001 can be connected either single-ended or differen- tially to any of the Analog Devices PLL family of ICs. It is recom- mended to use a differential connection for best performance and to achieve maximum power transfer. The application circuit shown in Figure 10 shows the ADF5001 used as the RF prescaler in a microwave 16 GHz PLL loop. The ADF5001 divides down the 16 GHz RF signal to 4 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 then 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 like the ADP150 can be used to power the resistor divider network or the +IN A pin directly. ADF5001 PRESCALER VDD1 RFOUT RFOUTB VDD2 ADF4156 PLL RFINA RFINB GND 10pF 0.1µF CP 820pF 220 Ω 330 Ω 1.8nF 47nF 1k Ω 1.8nF MICROWAVE VCO RFOUT VTUNE RFIN 37 Ω 150 Ω 150 Ω 1µF VP/2 18 Ω 6dB PAD 18 Ω 16GHz OUT DECOUPLING INTEGRATED OP184 OP AMP Figure 10. ADF5001 Used as the RF Prescaler in a Microwave 16 GHz PLL Loop |
Nº de peça semelhante - ADF5001 |
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Descrição semelhante - ADF5001 |
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