AD9861 datasheet(19/52 Pages) AD

19 / 52 page

AD9861

Rev. 0 | Page 19 of 52

Figure 58 to Figure 63 use the same input data to the Tx path, a 256-carrier OFDM signal over a 1.75 MHz bandwidth, centered at 7 MHz.

The center four carriers are removed from the signal to observe the in-band intermodulation distortion (IMD) from the DAC output.

6.0

6.2

6.4

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6.8

7.0

7.2

7.4

7.6

7.8

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8.0

FREQUENCY (MHz)

Figure 58. AD9861 Tx Path FFT, 256-Carrier (Center Four Carriers Removed)

OFDM Signal over 1.75 MHz Bandwidth, Centered at 7 MHz, with

20 mA Full-Scale Output into 60 Ω Differential Load

6.06

6.08

6.10

6.12

6.14

6.16

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6.18

FREQUENCY (MHz)

Figure 59. AD9861 Tx Path FFT, Lower-Band IMD Products of

OFDM Signal in Figure 58

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FREQUENCY (MHz)

Figure 60. AD9861 Tx Path FFT of OFDM Signal in Figure 52,

with 1× Interpolation

6.97

6.98

6.99

7.00

7.01

7.02

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7.03

FREQUENCY (MHz)

Figure 61. AD9861 Tx Path FFT, In-Band IMD Products of

OFDM Signal in Figure 58

7.81

7.83

7.85

7.87

7.89

7.91

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7.93

FREQUENCY (MHz)

Figure 62. AD9861 Tx Path FFT, Upper-Band IMD Products of

OFDM Signal in Figure 52

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FREQUENCY (MHz)

Figure 63. AD9861 Tx Path FFT of OFDM Signal in Figure 52,

with 4× Interpolation

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