The PDSP16318/A contains two independent 20-bit Adder/Subtractors combined with accumulator registers and shift structures. The four port architecture permits full 20MHz throughout in FFT and filter applications.

Two PDSP16318As combined with a single PDSP16112A Complex Multiplier provide a complete arithmetic solution for a Radix 2 DIT FFT Butterfly. A new complex Butterfly result can be generated every 50ns allowing 1K complex FFTs to be executed in 256µs.

FEATURES

■ Full 20MHz Throughout in FFT Applications

■ Four Independent 16-bit I/O Ports

■ 20-bit Addition or Accumulation

■ Fully Compatible with PDSP16112 Complex Multiplier

■ On Chip Shift Structures for Result Scaling

■ Overflow Detection

■ Independent Three-State Outputs and Clock Enables for 2 Port 20MHz Operation

■ 1.4 micron CMOS

■ 500mW Maximum Power Dissipation

■ 100 CQFP package

APPLICATIONS

■ High speed Complex FFT or DFTs

■ Complex Finite Impulse Response (FIR) Filtering

■ Complex Conjugation

■ Complex Correlation/Convolution