AD9863 Analog Devices, AD9863 Datasheet - Page 16

• Manufacturer Part Number: AD9863
• Description: 12-Bit Mixed-Signal Front-End (MxFE® )Processor For Broadband Applications
• Manufacturer: Analog Devices

Specifications of AD9863

• Resolution (bits): 12bit
• # Chan: 2
• Sample Rate: 50MSPS
• Interface: Par
• Analog Input Type: Diff-Uni
• Ain Range: 2 V p-p
• Adc Architecture: Pipelined
• Pkg Type: CSP

AD9863
Figure 40 to Figure 45 use the same input data to the Tx path, a 256-carrier OFDM signal over a 23 MHz bandwidth, centered at 23 MHz.
The four center carriers are removed from the signal to observe the in-band intermodulation distortion (IMD) from the DAC output.
Figure 40. AD9863 Tx Path FFT, 256-Carrier (Four Center Carriers Removed)
OFDM Signal over 23 MHz Bandwidth, Centered at 7 MHz, with
–100
–110
–120
–100
–110
–120
–100
–110
–120
–30
–40
–50
–60
–70
–80
–90
–30
–40
–50
–60
–70
–80
–90
–30
–40
–50
–60
–70
–80
–90
Figure 41. AD9863 Tx Path FFT, Lower-Band IMD Products of
Figure 42. AD9863 Tx Path FFT of OFDM Signal in Figure 40,
10.5
9
0
20 mA Full-Scale Output into 60 Ω Differential Load
10.7
10
14
10.9
20
OFDM Signal in Figure 40
11.1
with 1× Interpolation
30
19
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
11.3
40
11.5
24
50
11.7
60
11.9
29
70
12.1
80
12.3
34
90
12.5
Rev. A| Page 16 of 40
–100
–110
–120
–100
–110
–120
–100
–110
–120
–30
–40
–50
–60
–70
–80
–90
–30
–40
–50
–60
–70
–80
–90
–30
–40
–50
–60
–70
–80
–90
Figure 44. AD9863 Tx Path FFT, Upper-Band IMD Products of
Figure 45. AD9863 Tx Path FFT of OFDM Signal in Figure 40,
6.97
33.5
Figure 43. AD9863 Tx Path FFT, In-Band IMD Products of
0
33.7 33.9
10
6.98
20
OFDM Signal in Figure 40
OFDM Signal in Figure 40
34.1
with 2× Interpolation
6.99
30
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
34.3 34.5
40
7.00
50
34.7
60
7.01
34.9
70
35.1 35.3
7.02
80
90
7.03
35.5