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ADF4252,pdf datasheet (Frequen
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2009-09-16
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The ADF4252 is a dual fractional-N/integer-N frequency
synthesizer that can be used to implement local oscillators
(LO) in the upconversion and downconversion sections of
wireless receivers and transmitters. Both the RF and IF synthesizers
consist of a low noise digital PFD (phase frequency
detector), a precision charge pump, and a programmable reference
divider. The RF synthesizer has a --based fractional
interpolator that allows programmable fractional-N division.
The IF synthesizer has programmable integer-N counters. A
complete PLL (phase-locked loop) can be implemented if the
synthesizer is used with an external loop filter and VCO (voltage
controlled oscillator).
synthesizer that can be used to implement local oscillators
(LO) in the upconversion and downconversion sections of
wireless receivers and transmitters. Both the RF and IF synthesizers
consist of a low noise digital PFD (phase frequency
detector), a precision charge pump, and a programmable reference
divider. The RF synthesizer has a --based fractional
interpolator that allows programmable fractional-N division.
The IF synthesizer has programmable integer-N counters. A
complete PLL (phase-locked loop) can be implemented if the
synthesizer is used with an external loop filter and VCO (voltage
controlled oscillator).
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