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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. General purpose DSPs are available which support either fixed-point arithmetic or floating-point arithmetic. Fixed-point processors
Modulator Bitstream 256 Kbit Multiplier/ Accumulator 24 bits FIR 224 Word 24-bit RAM 1 2 3 Coefficients 33 13 101 11-bit 24-bit 24-bit Decimation 8 4,8,16,32,64,...
AN5302K Datasheet
