The PDSP16350 provides an integrated solution to the need for very accurate, digitised, sine and cosine waveforms. Both these waveforms are produced simultaneously, with 16 bit amplitude accuracy, and are synthesised using a 34 bit phase accumulator. The more significant bits of this provide 16 bits of phase accuracy for the sine and cosine look up tables. With a 20 MHz system clock, waveforms up to 10 MHz can be produced, with 0.001 Hz resolution. If frequency modulation is required with no discontinuities, the phase increment value can be changed linearly on every clock cycle. Alternatively absolute phase jumps can be made to any phase value. The provision of two output multipliers allows the sine and cosine waveforms to be amplitude modulated with a 16 bit value present on the input port. This option can also be used to generate the in-phase and quadrature components from an incoming signal. This I/Q split function is required by systems which employ complex signal processing.

FEATURES
■ Direct Digital Synthesiser producing simultaneous sine and cosine values
■ 16 bit phase and amplitude accuracy, giving spur levels down to - 90 dB
■ Synthesised outputs from DC to 10 MHz with accuracies better than 0.001 Hz
■ Amplitude and Phase modulation modes
■ 84 pin PGA or 132 pin QFP

APPLICATIONS
■ Numerically controlled oscillator (NCO)
■ Quadrature signal generator
■ FM, PM, or AM signal modulator
■ Sweep Oscillator
■ High density signal constellation applications with simultaneous amplitude and phase modulation
■ VHF reference for UHF generators
■ Signal demodulator