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Description:Low Power dual RF/IF Integer-N PLL
Manufacturer:Analog Devices
Datasheet:PDF (284K).
Click here to download *)

The ADF4217L/ADF4218L/ADF4219L are low power dual frequency synthesizers that can be used to implement local oscillators in the up-conversion and down-conversion sections of wireless receivers and transmitters. They can provide the LO for both the RF and IF sections. They consist of a low noise digital PFD (phase frequency detector), a precision charge pump, a programmable reference divider, programmable A and B counters, and a dual modulus prescaler (P/P + 1). The A and B counters, in conjunction with the dual modulus prescaler (P/P + 1), implement an N divider (N = BP + A). In addition, the 14-bit reference counter (R Counter) allows selectable REFIN frequencies at the PFD input. A complete PLL (phase-locked loop) can be implemented if the synthesizers are used with an external loop filter and VCOs (voltage controlled oscillators).

Click here to download ADF4218L Datasheet
Click here to download ADF4218L Datasheet
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