AD9861 Analog Devices, AD9861 Datasheet - Page 20

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AD9861

Manufacturer Part Number
AD9861
Description
Manufacturer
Analog Devices
Datasheet

Specifications of AD9861

Resolution (bits)
10bit
# Chan
2
Sample Rate
80MSPS
Interface
Par
Analog Input Type
Diff-Uni
Ain Range
2 V p-p
Adc Architecture
Pipelined
Pkg Type
CSP

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AD9861
Figure 64 to Figure 69 use the same input data to the Tx path, a 256-carrier OFDM signal over a 23 MHz bandwidth, centered at 23 MHz.
The center four carriers are removed from the signal to observe the in-band intermodulation distortion (IMD) from the DAC output.
Figure 64. AD9861 Tx Path FFT, 256-Carrier (Center Four Carriers Removed)
–100
–120
–130
–140
–100
–120
–130
–140
–100
–120
–130
–110
OFDM Signal over 23 MHz Bandwidth, Centered at 7 MHz, with
–110
–110
–40
–50
–60
–70
–80
–90
–40
–50
–60
–70
–80
–90
–30
–40
–50
–60
–70
–80
–90
Figure 65. AD9861 Tx Path FFT, Lower-Band IMD Products of
Figure 66. AD9861 Tx Path FFT of OFDM Signal in Figure 52
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 64
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. 0 | Page 20 of 52
–100
–110
–120
–130
–140
–100
–110
–120
–130
–140
–100
–110
–120
–130
–40
–50
–60
–70
–80
–90
–40
–50
–60
–70
–80
–90
–30
–40
–50
–60
–70
–80
–90
Figure 68. AD9861 Tx Path FFT, Upper-Band IMD Products of
Figure 69. AD9861 Tx Path FFT of OFDM Signal in Figure 52
22.6
33.5
Figure 67. AD9861 Tx Path FFT, In-Band IMD Products of
0
33.7
10
22.7
33.9
20
22.8
OFDM Signal in Figure 64
OFDM Signal in Figure 64
34.1
with 4× Interpolation
30
22.9
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
34.3
40
23.0
34.5
50
34.7
23.1
60
34.9
23.2
70
35.1
23.3
80
35.3
90
23.4
35.5

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