AD9861 datasheet(20/52 Pages) AD

20 / 52 page

AD9861

Rev. 0 | Page 20 of 52

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.

1419

2429

–130

–140

–120

–110

–100

–90

–80

–70

–60

–50

–40

FREQUENCY (MHz)

Figure 64. AD9861 Tx Path FFT, 256-Carrier (Center Four Carriers Removed)

OFDM Signal over 23 MHz Bandwidth, Centered at 7 MHz, with

20 mA Full-Scale Output into 60 Ω Differential Load

10.5

10.7

10.9

11.1

11.3

11.5

11.7

11.9

12.1

12.3

12.5

–130

–140

–120

–110

–100

–90

–80

–70

–60

–50

–40

FREQUENCY (MHz)

Figure 65. AD9861 Tx Path FFT, Lower-Band IMD Products of

OFDM Signal in Figure 64

203040

506070

8090

–130

–120

–110

–100

–90

–80

–70

–60

–50

–40

–30

FREQUENCY (MHz)

Figure 66. AD9861 Tx Path FFT of OFDM Signal in Figure 52

with 1× Interpolation

22.6

22.7

22.8

22.9

23.0

23.1

23.2

23.3

23.4

–130

–140

–120

–110

–100

–90

–80

–70

–60

–50

–40

FREQUENCY (MHz)

Figure 67. AD9861 Tx Path FFT, In-Band IMD Products of

OFDM Signal in Figure 64

33.5

33.7

33.9

34.1

34.3

34.5

34.7

34.9

35.1

35.3

35.5

–130

–140

–120

–110

–100

–90

–80

–70

–60

–50

–40

FREQUENCY (MHz)

Figure 68. AD9861 Tx Path FFT, Upper-Band IMD Products of

OFDM Signal in Figure 64

203040

506070

8090

–130

–120

–110

–100

–90

–80

–70

–60

–50

–40

–30

FREQUENCY (MHz)

Figure 69. AD9861 Tx Path FFT of OFDM Signal in Figure 52

with 4× Interpolation

AD9861 Datasheet(PDF) 20 Page - Analog Devices

AD9861 Datasheet(HTML) 20 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

Datasheet Download

Link URL