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MAX12558 Datasheet(PDF) 21 Page - Maxim Integrated Products

Part # MAX12558
Description  Dual, 80Msps, 14-Bit, IF/Baseband ADC
PDF  30 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX12558 Datasheet(HTML) 21 Page - Maxim Integrated Products

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Dual, 80Msps, 14-Bit, IF/Baseband ADC
______________________________________________________________________________________
21
BINARY-TO-GRAY CODE CONVERSION
1) THE MOST SIGNIFICANT GRAY-CODE BIT IS THE SAME
AS THE MOST SIGNIFICANT BINARY BIT.
01
10
0100
1100
BINARY
GRAY CODE
0
2) SUBSEQUENT GRAY-CODE BITS ARE FOUND ACCORDING
TO THE FOLLOWING EQUATION:
D13
D7
D3
D0
GRAYX = BINARYX + BINARYX + 1
BIT POSITION
0
1
10
0100
1100
BINARY
GRAY CODE
0
BIT POSITION
GRAY12 = BINARY12
BINARY13
GRAY12 = 1
0
GRAY12 = 1
1
3) REPEAT STEP 2 UNTIL COMPLETE:
01
1
0
0100
1100
BINARY
GRAY CODE
0
BIT POSITION
GRAY11 = BINARY11
BINARY12
GRAY11 = 1
1
GRAY11 = 0
10
4) THE FINAL GRAY-CODE CONVERSION IS:
01
10
0100
1100
BINARY
GRAY CODE
0
BIT POSITION
10
1
1
1
0
1
1010
GRAY-TO-BINARY CODE CONVERSION
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:
BINARYX = BINARYX+1
BIT POSITION
BINARY12 = BINARY13
GRAY12
BINARY12 = 0
1
BINARY12 = 1
3) REPEAT STEP 2 UNTIL COMPLETE:
4) THE FINAL BINARY CONVERSION IS:
01
0
0
1110
101
0
BINARY
GRAY CODE
BIT POSITION
0
BINARY
GRAY CODE
01
0
0
11
0
11
0
1
0
BINARY11 = BINARY12
GRAY11
BINARY11 = 1
0
BINARY11 = 1
GRAYX
0
1
0
1
1110
101
0
BINARY
GRAY CODE
0
BIT POSITION
1
01
0
1110
101
0
BINARY
GRAY CODE
0
BIT POSITION
11
01
1
1
0100
110
0
AB
Y
=
AB
00
01
10
11
0
1
1
0
EXCLUSIVE OR TRUTH TABLE
WHERE
IS THE EXCLUSIVE OR FUNCTION (SEE TRUTH
TABLE BELOW) AND X IS THE BIT POSITION:
+
WHERE
IS THE EXCLUSIVE OR FUNCTION (SEE TRUTH
TABLE BELOW) AND X IS THE BIT POSITION:
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
FIGURE 8 SHOWS THE GRAY-TO-BINARY AND BINARY-TO-GRAY
CODE CONVERSION IN OFFSET BINARY FORMAT. THE OUTPUT
FORMAT OF THE MAX12558 IS TWO'S-COMPLEMENT BINARY,
HENCE EACH MSB OF THE TWO'S-COMPLEMENT OUTPUT CODE
MUST BE INVERTED TO REFLECT TRUE OFFSET BINARY FORMAT.
D11
11
11
11
11
10
11
10
D13
D7
D3
D0
D11
110
D13
D7
D3
D0
D11
11
01
D13
D7
D3
D0
D11
D13
D7
D3
D0
D11
D13
D7
D3
D0
D11
D13
D7
D3
D0
D11
D13
D7
D3
D0
D11
Figure 8. Binary-to-Gray and Gray-to-Binary Code Conversion



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