PDSP16350

· 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

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

Supply voltage Vcc                                   -0.5V to 7.0V
Input voltage V_IN                           -0.5V to Vcc + 0.5V
Output voltage V_OUT                      -0.5V to Vcc + 0.5V
Clamp diode current per pin I_K (see note 2)        18mA
Static discharge voltage (HMB)                             500V
Storage temperature T_S                        -65 to 150
Ambient temperature with power applied T_AMB
Military                                                -55 to +125
Industrial                                                -40 to 85
Junction temperature                                         150
Package power dissipation                           3500mW
Thermal resistances
Junction to Case _JC                                        5/W
NOTES
1. Exceeding these ratings may cause permanent damage.Functional operation under these conditions is not implied.
2. Maximum  dissipation or  1 second  should not  be ex-ceeded, only one output to be tested at any one time.
3. Exposure to absolute maximum ratings for extended peri-ods may affect device reliablity.
4. Vcc = Max, Outputs Unloaded, Clock Freq = Max.
5. CMOS levels are defined as
V_IH = V_DD - 0.5v
V_IL = +0.5v
6. Current is defined as positive into the device.
7. The _JC  data assumes that heat is extracted from the top face of the package.

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 PDSP16350 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 modula- tion is required with no discontinuities, the PDSP16350 can be changed linearly on every clock cycle. Alterna-tively 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. The PDSP16350 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.