UG-200
Evaluation Board User Guide
Rev. 0 | Page 8 of 28
Applying Input Signal and Optimizing SFDR
Apply the input signal as follows:
1.
Apply the input signal so that the fundamental is at the
desired level (examine the
Fund Power
reading in the left
panel of the
VisualAnalog FFT
window). See Figure 11
and Figure 12.
09
43
6-
0
11
Figure 11. VisualAnalog, FFT Graph, No Signal or Very Low Signal Applied
09
43
6-
0
12
Figure 12. VisualAnalog, FFT Graph, Full-Scale Signal Applied
09
43
6-
0
13
Figure 13. Typical FFT, AD9467 (No Buffer Current Optimization)
2.
To optimize SFDR performance, use Register 36 and
Register 107 to change the buffer current setting. In the
ADCBase 0
tab of the SPI Controller, find the
BUFFER(36)
/
BUFFER(107)
box. Use the drop-down list box to select
the best current, if necessary. See the AD9467 data sheet, the
AN-878
Application Note, and the
AN-877
Application
Note for reference.
0
94
36-
01
4
Figure 14. SPI Controller, BUFFER(36)/BUFFER(107)
Содержание UG-200
Страница 17: ...Evaluation Board User Guide UG 200 Rev 0 Page 17 of 28 09436 024 Figure 24 Top Layer 1...
Страница 18: ...UG 200 Evaluation Board User Guide Rev 0 Page 18 of 28 09436 025 Figure 25 Ground Layer 2...
Страница 19: ...Evaluation Board User Guide UG 200 Rev 0 Page 19 of 28 09436 026 Figure 26 Power Plane Layer 3...
Страница 20: ...UG 200 Evaluation Board User Guide Rev 0 Page 20 of 28 09436 027 Figure 27 Ground Plane Layer 4...
Страница 21: ...Evaluation Board User Guide UG 200 Rev 0 Page 21 of 28 09436 028 Figure 28 Ground Plane Layer 5...
Страница 22: ...UG 200 Evaluation Board User Guide Rev 0 Page 22 of 28 09436 029 Figure 29 Power Plane Layer 6...
Страница 23: ...Evaluation Board User Guide UG 200 Rev 0 Page 23 of 28 09436 030 Figure 30 Ground Plane Layer 7...
Страница 24: ...UG 200 Evaluation Board User Guide Rev 0 Page 24 of 28 09436 031 Figure 31 Bottom Side Layer 8...
