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AN53

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The CS5322 Digital Filter

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AN53

The CS5322 Digital Filter

by Jerome Johnston

Delta-Sigma A/D converters have become

widely accepted by data acquisition designers

because of their high performance. One of the

highest dynamic range Delta-Sigma converters is

the Crystal Semiconductor CS5321/CS5322 chip

set. The CS5321 is a fourth order modulator.

The CS5322 is a linear phase FIR decimation

filter. The purpose of this Technical Brief is to

compare the architecture of a general purpose

DSP chip with that of the CS5322.

are lower cost but floating-point processors have

more horsepower. Fixed point processors work

with either 16, 20, or 24-bit data words, while

floating-point processors operate with 32-bit data

words. The size of the data word greatly

influences the cost of the chip and the cost of the

overall system. This is because data word length

determines the size of the registers used in the

processor, the number of pins required on the

package, and the word-width of the external

memory. If low cost is the number one goal in a

DSP design, the designer will specify a DSP

which has the smallest word size that the

application can tolerate.

General purpose DSPs are available which

support either fixed-point arithmetic or

floating-point arithmetic. Fixed-point processors

Modulator Bitstream

256 Kbit

11 Bits

ROM

33 11-bit

Coefficients

Multiplier/

Accumulator

24 bits

FIR

Coefficients

Decimation

224 Word

24-bit RAM

101

11-bit

24-bit

4,8,16,32,64,... 256

24 bits

60 bits

ROM

96 60-bit

Coefficients

24 x 24

Multiplier

50 Bits

48 Bits

24 bits

50-bit Accumulator Array

(9 50-bit accumulators)

24-bit Serial Port

Figure 1. Digital Filter Block Diagram

Crystal Semiconductor Corporation

P.O. Box 17847, Austin, TX 78760

(512) 445 7222 FAX 445 7581

http://www.crystal.com

JUL ’96

AN53REV2

12 3

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