AD9650-25EBZ Analog Devices Inc, AD9650-25EBZ Datasheet - Page 10

• Manufacturer Part Number: AD9650-25EBZ
• Description: 16Bit Hi SNR 25 Msps Dual ADC
• Manufacturer: Analog Devices Inc

Specifications of AD9650-25EBZ

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

UG-003
4.
5.
Note that other settings can be changed on the ADCBase 0
page (see Figure 12) and the ADC A and ADC B pages
(see Figure 13) to set up the part in the desired mode. The
ADCBase 0 page settings affect the entire part, whereas the
settings on the ADC A and ADC B pages affect the selected
channel only. See the appropriate part data sheet; the
Application Note, High Speed ADC SPI Control Software; and
the
via SPI, for additional information on the available settings.
Click the Run button in the VisualAnalog toolbar (see
Figure 14).
Figure 14. Run Button (Encircled in Red) in VisualAnalog Toolbar,
AN-877
Figure 13. SPI Controller, Example ADC A Page
Application Note, Interfacing to High Speed ADCs
Collapsed Display
AN-878
Rev. A | Page 10 of 40
Adjusting the Amplitude of the Input Signal
The next step is to adjust the amplitude of the input signal for
each channel as follows:
1.
2.
3.
Adjust the amplitude of the input signal so that the
fundamental is at the desired level. Examine the Fund Power
reading in the left panel of the VisualAnalog Graph - AD9268
Average FFT window (see Figure 15).
Repeat this procedure for Channel B.
Click the disk icon within the Graph window to save the
performance plot data as a .csv formatted file. See Figure 16
for an example.
–100
–120
–140
–20
–40
–60
–80
0
0
SECOND HARMONIC
125MSPS
70.1MHz @ –1dBFS
SNR = 76.5dB (77.5dBFS)
SFDR = 88.0dBc
Figure 15. Graph Window of VisualAnalog
Figure 16. Typical FFT, AD9268/AD9258
10
Evaluation Board User Guide
20
FREQUENCY (MHz)
THIRD HARMONIC
30
40
50
60