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PDSP16340 Datasheet PDF : 14 Pages
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PDSP16340
FEBPRUDASRPY161394905
ADVANCE INFORMATION
DS3710 - 2.1
POLAR TO CARTESIAN CONVERTER
(Supersedes version in December 1993 Digital Video & Digital Signal Processing IC Handbook, HB3923-1)
The PDSP16340 can be configured to perform either a
coordinate conversion function, or simply to provide a sine /
cosine look-up table. When employed as a coordinate conver-
sion processor, the device converts data from 16 bit polar
coordinates (R,Ø) into 16 bit cartesian coordinates (Real,
Imaginary). The translation is illustrated in Fig. 1, and uses the
formula:-
Xr = R cos(Ø)
Xi = R sin(Ø)
In look-up table mode, the user enters 16 bit phase data,
and the chip outputs the corresponding sine and cosine
values. A typical application is shown in Fig. 5.
The PDSP16340 is pipelined to process a continuous
stream of data at 20 MHz, and outputs a new (16 + 16) bit result
every clock cycle. The RANGE control signal allows the user
to select the input range most appropriate to the system. Data
is produced in Two’s Complement Fractional format.
APPLICATIONS
Digital Signal Processing
Radar Systems
Sonar Systems
Robotics
Medical Imaging
FEATURES
Provides R cos(Ø) and R sin(Ø) in 16 bit streams using a
CORDIC processor
Look-up table equivalent to 64k by 32 bit ROM
20MHz clock rate
Tri-state outputs and independent data enables
84 Pin PGA or 132 pin QFP
ASSOCIATED PRODUCTS
PDSP16330
PDSP16256
PDSP16510
PDSP16350
PDSP16116
PDSP16318
Pythagoras Processor
Programmable FIR Filter
FFT Processor
I/Q Splitter and NCO
16 Bit Complex Multiplier
Complex Accumulator
Imaginary
Xi
R
Phase
CORDIC PROCESSOR
ARRAY
Magnitude
Magnitude
Adjust
Ø
Xr
Real
Fig. 1. Cartesian to Polar Coordinates
Real
(Cosine)
Imaginary
(Sine)
Fig. 2. Simplified Block Diagram
1
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