AD9789 Analog Devices, AD9789 Datasheet - Page 66

• Manufacturer Part Number: AD9789
• Description: 14-Bit, 2400 MSPS RF DAC with 4-Channel Signal Processing
• Manufacturer: Analog Devices

Specifications of AD9789

• Resolution (bits): 14bit
• Dac Update Rate: 2.4GSPS
• Dac Settling Time: 13ns
• Max Pos Supply (v): +3.47V
• Single-supply: No
• Dac Type: Current Out
• Dac Input Format: LVDS,Par

AD9789
110,100 111,000 010,100 011,000 100,000 101,010 110,000 111,010
100,100 101,000 000,100 001,000 000,000 001,010 010,000 011,010
010,011 011,001 000,011 001,001 000,001 001,101 100,001 101,101
010,110 011,100 000,110 001,100 000,010 001,110 100,010 101,110
110,111 111,011 010,111 011,011 100,101 101,111 110,101 111,111
100,111 101,011 000,111 001,011 000,101 001,111 010,101 011,111
110,011 111,001 100,011 101,001 010,001 011,101 110,001 111,101
110,110 111,100 100,110 101,100 010,010 011,110 110,010 111,110
π
π
/2 ROTATION
I
I
K
K
ROTATION
Q
Q
K
K
= 10
= 11
I
K
Figure 125. DVB-C 256-QAM Constellation
Figure 126. DOCSIS 64-QAM Constellation
Q
K
ARE THE TWO MSBs IN EACH QUADRANT.
15
13
11
9
7
5
3
1
00
10
0000
0010
1010
1000
1010
0010
0000
1
1000 1001 1101 1100
Rev. A | Page 66 of 76
Q
00
10
0001
1001
0011
1011
1011
0011
0001 0101 0100
3
0101
0111
1111
1111
0111
1101
5
3
π
/2 ROTATION
I
K
0100
0110
1110
1100
1110
0110
Q
7
K
= 01
11
01
0100
0110
1110
1100
1100
1110
0110
0100
9
11
01
0101
0111
1101
0111
1111
1101
1111
0101
11
0001
0011
1011
1001
1001
1011
0011
0001
13
C5 C4 C3, C2 C1 C0
0000
0010
1010
1000
1000
1010
0010
0000
I
15
I
K
Q
K
= 00