HSP45102

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 worst case frequency resolution of 0.009Hz, the NCO12 providessignificant accuracy for frequency synthesis solutions at a competitive price.

The HSP45102 frequency to be generated is selected from two frequency control words. A single control pin selects which word is used to determine the output frequency. Switching from one frequency to another occurs in one clock cycle, with a 6 clockpipeline delay from the time that the new control word is loaded until t3-he new frequency appears on the output.

Two pins, P0-1, are provided by HSP45102  for phase modulation. They are encoded and added to the top two bits of the phase accumulator to offset the phase in 90o increments. The 13-bit output of the Phase Offset Adder is mapped to the sine wave amplitude via the Sine ROM. The output data format is offset binary to simplify interfacing to D/A converters. Spurious frequency components in the output sinusoid are less than -69dBc.

The NCO12 has applications as a Direct Digital Synthesizer and modulator in low cost digital radios, satellite terminals, and function generators.