PDSP16318/16318A

1

Supersedes version DS3708 - 2.4 September 1996

DS3708 - 3.1 November 1998

PDSP16318/PDSP16318A

Complex Accumulator

Advance Information

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 256

µs.

FEATURES

s

Full 20MHz Throughout in FFT Applications

s

Four Independent 16-bit I/O Ports

s

20-bit Addition or Accumulation

s

Fully Compatible with PDSP16112 Complex Multiplier

s

On Chip Shift Structures for Result Scaling

s

Overflow Detection

s

Independent Three-State Outputs and Clock

Enables for 2 Port 20MHz Operation

s

1.4 micron CMOS

s

500mW Maximum Power Dissipation

s

100 CQFP package

APPLICATIONS

s

High speed Complex FFT or DFTs

s

Complex Finite Impulse Response (FIR) Filtering

s

Complex Conjugation

s

Complex Correlation/Convolution

ASSOCIATED PRODUCTS

PDSP16112 16 x 12 Complex Multiplier

PDSP16116 16 x 16 Complex Multiplier

PDSP1601

ALU and Barrel Shifter

PDSP16330 Pythagoras Processor

Fig.1 Pin connections - Top view (GC100)

GC100

ORDERING INFORMATION

Industrial (-40

PDSP16318A/IG/GC1R

(20MHz - QFP)

Military (-55

PDSP16318/MC/GC1R

(10MHz - QFP

MIL STD 883C Screened)

N.B. Further details of the Military grade part are available

in a separate datasheet

Fig. 2 PDSP16318 simplified block diagram

REG

DELAY

A

B

B

A

SHIFT

REG

C

A

B

SHIFT

REG

D

REG