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ADF7011 Arkusz danych(PDF) 6 Page - Analog Devices |
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ADF7011 Arkusz danych(HTML) 6 Page - Analog Devices |
6 / 24 page REV. 0 –6– ADF7011 PIN FUNCTION DESCRIPTIONS (continued) Pin No. Mnemonic Function 15 OSC1 Oscillator Pin. For use with crystal reference only. This is three-stated when an external reference oscilla- tor is used. 16 VCOGND Voltage Controlled Oscillator Ground. 17 TEST Input to the RF Fractional-N Divider. This pin allows the user to connect an external VCO to the part. Disabling the internal VCO activates this pin. If the internal VCO is used, this pin should be grounded. 18 DVDD Positive Supply for the Digital Circuitry. This must be between 2.3 V and 3.6 V. Decoupling capacitors to the analog ground plane should be placed as close as possible to this pin. 19 RFGND Ground for Output Stage of Transmitter. 20 RFOUT The modulated signal is available at this pin. Output power levels are from –16 dBm to +12 dBm. The output should be impedance matched to the desired load using suitable components. See the RF Output Stage section. 21 AGND Ground Pin for the RF Analog Circuitry. 22 VCOIN The tuning voltage on this pin determines the output frequency of the Voltage Controlled Oscillator (VCO). The higher the tuning voltage, the higher the output frequency. 23 CVCO A 0.22 µF capacitor should be added to reduce noise on VCO bias lines. Tied to the C REG pin. 24 CREG A 2.2 µF capacitor should be added at C REG, tied to GND, to reduce regulator noise and improve stability. A reduced capacitor will improve regulator power-on time but may cause higher spurious components. |
Podobny numer części - ADF7011_15 |
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Podobny opis - ADF7011_15 |
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