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The Intersil HSP45102 is Numerically Controlled Oscillator(NCO12) with 32-bit frequency resoluTIon and 12-bit output.With over 69dB of spurious free dynamic range and worstcase frequency resoluTIon of 0.009Hz, the NCO12 providessignificant accuracy for frequency synthesis soluTIons at acompeTItive price.The frequency to be generated is selected from two frequencycontrol words. A single control pin selects which word is usedto determine the output frequency. Switching from onefrequency to another occurs in one clock cycle, with a 6 clockpipeline delay from the time that the new control word isloaded until t4-he new frequency appears on the output.Two pins, P0-1, are provided for phase modulation. They areencoded and added to the top two bits of the phaseaccumulator to offset the phase in 90° increments.The 13-bit output of the Phase Offset Adder is mapped to thesine wave amplitude via the Sine ROM. The output dataformat is offset binary to simplify interfacing to D/Aconverters. Spurious frequency components in the outputsinusoid are less than -69dBc.The NCO12 has applications as a Direct Digital Synthesizerand modulator in low cost digital radios, satellite terminals,and function generators.
