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PDSP16318/16318A

PDSP16318/PDSP16318A

Complex Accumulator

Advance Information

Supersedes version DS3708 - 2.4 September 1996

DS3708 - 3.1 November 1998

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碌s.

GC100

FEATURES

s

s

s

s

s

s

s

s

s

s

s

s

s

s

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

Fig.1 Pin connections - Top view (GC100)

ASSOCIATED PRODUCTS

PDSP16112

PDSP16116

PDSP1601

PDSP16330

16 x 12 Complex Multiplier

16 x 16 Complex Multiplier

ALU and Barrel Shifter

Pythagoras Processor

ORDERING INFORMATION

Industrial (-40

擄

C to +85

擄

C)

PDSP16318A/IG/GC1R

(20MHz - QFP)

Military (-55

擄

C to +125

擄

C)

PDSP16318/MC/GC1R

(10MHz - QFP

MIL STD 883C Screened)

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

in a separate datasheet

APPLICATIONS

High speed Complex FFT or DFTs

Complex Finite Impulse Response (FIR) Filtering

Complex Conjugation

Complex Correlation/Convolution

A

REG

DELAY

B

SHIFT

A

REG

C

A

SHIFT

B

REG

B

REG

D

Fig. 2 PDSP16318 simplified block diagram

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