AD9736BBC datasheet(46/72 Pages) AD

46 / 72 page

AD9734/AD9735/AD9736

Data Sheet

Rev. B | Page 46 of 72

GENERATING EXPECTED SIGNATURES

The following MATLAB code duplicates the internal logic of

the AD973x. To use it, save this code in a file called bist.m.

--- begin bist.m ---

function [ ret1 , ret2] = bist(vec)

ret1 = bist1(vec(1:2:length(vec)-1));

ret2 = bist1(vec(2:2:length(vec)));

function ret = bist1(v)

sum = zeros(1,32);

for i = 1 :length(v)

if v(i) ~= 0

su(1) = ~xor(sum(32) ,bitget(v(i),1));

su(2) = ~xor(sum(1) ,bitget(v(i),2));

su(3) = ~xor(sum(2) ,bitget(v(i),3));

su(4) = ~xor(sum(3) ,bitget(v(i),4));

su(5) = ~xor(sum(4) ,bitget(v(i),5));

su(6) = ~xor(sum(5) ,bitget(v(i),6));

su(7) = ~xor(sum(6) ,bitget(v(i),7));

su(8) = ~xor(sum(7) ,bitget(v(i),8));

su(9) = ~xor(sum(8) ,bitget(v(i),9));

su(10) = ~xor(sum(9) ,bitget(v(i),10));

su(11) = ~xor(sum(10) ,bitget(v(i),11));

su(12) = ~xor(sum(11) ,bitget(v(i),12));

su(13) = ~xor(sum(12) ,bitget(v(i),13));

su(14) = ~xor(sum(13) ,bitget(v(i),14));

su(15) = sum(14); su(16) = sum(15);

su(17) = sum(16); su(18) = sum(17);

su(19) = sum(18); su(20) = sum(19);

su(21) = sum(20); su(22) = sum(21);

su(23) = sum(22); su(24) = sum(23);

su(25) = sum(24); su(26) = sum(25);

su(27) = sum(26); su(28) = sum(27);

su(29) = sum(28); su(30) = sum(29);

su(31) = sum(30); su(32) = sum(31);

sum = su;

end

end % for ret = dec2hex( 2.^[0:31]* sum',8);

--- end bist.m ---

To generate the expected BIST signatures, follow this procedure:

Start MATLAB and type the following at the command

prompt:

t = round(randn(1,100) × 213/8+213) ;

[ b1 b2 ] = bist(t)

The first statement creates a random vector of 14-bit

words, with a length of 100.

Set t equal to any desired vector, or take this random vector

and input it to the AD973x.

Alter the command randn(1,100) to change the vector

length as desired.

Type b1 at the command line to see the calculated

signature for the LVDS BIST, Phase 1.

Type b2 to see the value for LVDS BIST, Phase 2.

The values returned for b1 and b2 each are 32-bit hex values.

They correspond to Reg. 18, Reg. 19, Reg. 20, and Reg. 21,

where b1 is the value read for SEL<1:0> = 0, 0 (see Table 17)

and b2 is the value read for SEL<1:0> = 0, 1.

When the DAC is in 1× mode, the signature at SYNC BIST,

Phase 1 should equal the signature at LVDS BIST, Phase 1. The

same is true for Phase 2.

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