UG-1825
EVAL-ADAQ8088EBZ
User Guide
Rev. 0 | Page 8 of 12
Figure 6. EVAL-ADAQ8088EBZ, AD9681-125EBZ, and HSC-ADC-EVALEZ Connections
TROUBLESHOOTING TIPS
If the FFT appears normal but the performance is poor, check
for the following:
Ensure that the output signal of the ADAQ8088 is clean
(low phase noise).
Ensure that the connection between the output of the
EVAL-ADAQ8088EBZ to the AD9681-125EBZ is tight.
Using a smaller length of cable or connector is
recommended.
Ensure that an appropriate filter is used on the analog input.
Ensure that the signal generator for the clock is clean
(low phase noise).
Slightly change the analog input frequency if
noncoherent sampling is used.
Ensure that the SPI configuration file matches the device
being evaluated.
For further details on troubleshooting while evaluating
the ADAQ8088 by driving the AD9681 ADC, see the
AD9681-125EBZ user guide page at
https://wiki.analog.com/resources/eval/ad9681-125ebz
.
2
5399-
006
3V BENCH
SUPPLY
EVAL-ADAQ8088EBZ
AD9681-125EBZ
HSC-ADC-EVALEZ
LPF
DIFFERENTIAL
SIGNAL
GENERATOR
1
2
LPF
SIGNAL GENERATOR
OPTIONAL
CLOCK SOURCE
PC RUNNING
VISUAL ANALOG
AND SPI CONTROLLER
USER SOFTWARE
SWITCHING
POWER SUPPLY
WALL OUTLET
100V AC TO 240V AC
47Hz TO 63Hz
6V
12V
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