DK2053

RF2053RF2053 HIGH PERFORMANCE FRACTIONAL-N SYNTHESIZER WITH INTEGRATED RF MIXER Package: QFN, 32-Pin, 5mmx5mm Mixer Features  Fractional-N Synthesizer  Very Fine Frequency Resolution 1.5Hz for 26MHz Reference  300MHz to 2400MHz External VCO Frequency Range  On-Chip Crystal-Sustaining Circuit With Programmable Loading Capacitors  Integrated LO Buffer and LO Divider  High-Linearity RF Mixer  Mixer Input IP3 +23dBm Typ.  Mixer Bias Adjustable for Low Power Operation  Mixer Frequency Range 30MHz to 2500MHz  2.7V to 3.6V Power Supply  Low Current Consumption 50mA to 70mA at 3V  3-Wire Serial Interface Applications  CATV Head-Ends  Digital TV Up/Down Converters  Digital TV Repeaters  Multi-Dwelling Units  Frequency Band Shifters  UHF/VHF Radios  Software Defined Radios  Satellite Communications  Super-Heterodyne Radios LO divider Synth Frac-N sequence generator Charge pump N divider Phase / freq detector Ref divider Functional Block Diagram Product Description The RF2053 is a low power, high performance, wideband RF frequency conversion chip with integrated local oscillator (LO) generation and RF mixer. The RF synthesizer includes an integrated fractional-N phase locked loop that can control an external VCO to produce a low-phase noise LO signal with a very fine frequency resolution. The VCO output frequency can be divided by 1, 2, or 4 in the LO divider, whose output is buffered and drives the built-in RF mixer which converts the signal into the require...