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AD9789BBCZ Datasheet(PDF) 65 Page - Analog Devices

Part # AD9789BBCZ
Description  14-Bit, 2400 MSPS RF DAC with 4-Channel Signal Processing
PDF  76 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD9789BBCZ Datasheet(HTML) 65 Page - Analog Devices

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AD9789
Rev. A | Page 65 of 76
QAM CONSTELLATION MAPS
Q
I
IKQK = 10
IKQK =11
IKQK = 00
IKQK = 01
1011
1001
1010
1000
0010
0011
0000
0001
1101
1100
1111
1110
0100
0110
0101
0111
IKQK ARE THE TWO MSBs IN EACH QUADRANT.
Figure 121. DVB-C 16-QAM Constellation
Q
I
IKQK = 10
IKQK ARE THE TWO MSBs IN EACH QUADRANT.
IKQK =11
IKQK = 00
IKQK = 01
101100 101110 100110 100100
101101 101111 100111 100101
101001 101011 100011 100001
101000 101010 100010 100000
001000 001001 001101 001100
001010 001011 001111 001110
000010 000011 000111 000110
000000 000001 000101 000100
110100 110101 110001 110000
110110 110111 110011 110010
111110 111111 111011 111010
111100 111101 111001 111000
010000 010010 011010 011000
010001 010011 011011 011001
010101 010111 011111 011101
010100 010110 011110 011100
Figure 122. DVB-C 64-QAM Constellation
Q
I
IKQK = 10
IKQK =11
IKQK = 00
IKQK = 01
10111
10011
10010
10101
10001
10110
10100
10000
00110
00010
00100
00101
00111
00000
00001
00011
11011
11001
11000
11111
11101
11100
11010
11110
01000
01100
01110
01001
01101
01010
01011
01111
IKQK ARE THE TWO MSBs IN EACH QUADRANT.
Figure 123. DVB-C 32-QAM Constellation
IKQK = 10
π/2 ROTATION
IKQK =11
π ROTATION
IKQK = 00
IKQK = 01
3
π/2 ROTATION
11010
11011
01011
01010
11000
11001
01001
01000
10000
10001
10101
10100
11100
11101
10010
10011
10111
10110
11110
11111
00010
00011
00111
00110
01110
01111
00000
00001
00101
00100
01100
01101
11
1
1
3
579
11
9
3
5
7
IKQK ARE THE TWO MSBs IN EACH QUADRANT.
Figure 124. DVB -C128-QAM Constellation3



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