Rainbow-electronics MAX12553 Manual do Utilizador Página 21

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MAX12553
14-Bit, 65Msps, 3.3V ADC
______________________________________________________________________________________ 21
BINARY-TO-GRAY CODE CONVERSION
1) THE MOST SIGNIFICANT GRAY CODE BIT IS THE SAME
AS THE MOST SIGNIFICANT BINARY BIT.
2) SUBSEQUENT GRAY CODE BITS ARE FOUND ACCORDING
TO THE FOLLOWING EQUATION:
BINARY
GRAY CODE
BIT POSITION
3) REPEAT STEP 2 UNTIL COMPLETE.
BINARY
GRAY CODE
BIT POSITION
4) THE FINAL GRAY CODE CONVERSION IS:
BINARY
BIT POSITION
GRAY-TO-BINARY CODE CONVERSION
WHERE IS THE EXCLUSIVE OR FUNCTION (SEE TRUTH
TABLE BELOW) AND X IS THE BIT POSITION.
011 101001100
0
D11 D7 D3 D0
1
D13
10
01 1 1 0100 1100
0
D11 D7 D3 D0
1
10
0
D13
01 1 1 0100 1100
D11 D7 D3 D0
10
D13
1011 0100 1100 BINARY
GRAY CODE0
D11 D7 D3 D0
BIT POSITION
01
D13
GRAY CODE0 101101110 1010
GRAY
X
= BINARY
X
BINARY
X+1
GRAY
12
= BINARY
12
BINARY
13
GRAY
12
= 1 0
GRAY
12
= 1
GRAY
11
= BINARY
11
BINARY
12
GRAY
11
= 1 1
GRAY
11
= 0
1) THE MOST SIGNIFICANT BINARY BIT IS THE SAME
AS THE MOST SIGNIFICANT GRAY CODE BIT.
2) SUBSEQUENT BINARY BITS ARE FOUND ACCORDING
TO THE FOLLOWING EQUATION:
GRAY CODE
BINARY
BIT POSITION
3) REPEAT STEP 2 UNTIL COMPLETE.
GRAY CODE
BINARY
BIT POSITION
4) THE FINAL GRAY CODE CONVERSION IS:
GRAY CODE
BIT POSITION
WHERE IS THE EXCLUSIVE OR FUNCTION (SEE TRUTH
TABLE BELOW) AND X IS THE BIT POSITION.
0
1
001110 1010
0
D11 D7 D3 D0
1
0
11
D13
11
01 0 1110 1010
0
D11 D7 D3 D0
11
D13
01 0 0 1110 1010
D11 D7 D3 D0
11
D13
0110 1110 1010 GRAY CODE
BINARY0
D11 D7 D3 D0
BIT POSITION
01
D13
BINARY0 111010100 1100
BINARY
X
= BINARY
X+1
GRAY
X
BINARY
12
= BINARY
13
GRAY
12
BINARY
12
= 0 1
BINARY
12
= 1
BINARY
11
= BINARY
12
GRAY
11
BINARY
11
= 1 0
BINARY
11
= 1
AB
00
01
10
11
0
1
1
0
EXCULSIVE OR TRUTH TABLE
Y = A B
Figure 9. Binary-to-Gray and Gray-to-Binary Code Conversion
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