ISOSD61TR datasheet(13/23 Pages) STMICROELECTRONICS

No. de pieza	ISOSD61TR

Descripción Electrónicos	High accuracy isolated Sigma-Delta modulator

PDF	23 Pages

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Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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13 / 23 page

%output_dec is 1x(samples/dec_fact)

nbits = 25;

accbits = 46; %minimum accumulator size

dutbits = 16;

stages = 3;

dec_fact = 256;

dim = size(in);

samples = dim(2);

feed_state = zeros(1,stages);

fwd_state = zeros(1, stages);

i = 1;

out_feed_state = 0;

for k=1:samples

if ( i > 1 )

output(k) = round(out_feed_state * 2^((dutbits-1)));

else

output(k) = 0;

end

if ( k == dec_fact*i )

output_dec(i) = round(out_feed_state * 2^((dutbits-1)));

in_fwd = feed_state(stages);

fwd_sum = 0;

for s=1:stages

fwd_sum += fwd_state(s);

end

out_feed_state = in_fwd - fwd_sum;

si = stages;

while(si > 1)

fwd_sum = 0;

for s=1:(si-1)

fwd_sum += fwd_state(s);

end

fwd_state(si) = in_fwd - fwd_sum;

si--;

end

fwd_state(1) = in_fwd;

i++;

end

si = stages;

while(si > 1)

feed_state(si) = feed_state(si) + feed_state(si-1);

si--;

end

feed_state(1) = feed_state(1) + in(k)* 2^(-(nbits-1));

end

ISOSD61

Theory of operation

DS13605 - Rev 11

page 13/23

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