Troubleshooting Tips - Analog Devices EVAL-ADAQ8088EBZ User Manual

UG-1825
DIFFERENTIAL
SIGNAL
GENERATOR

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.
Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com.
Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from
3V BENCH
SUPPLY
1 LPF
2 LPF
EVAL-ADAQ8088EBZ
Figure 6. EVAL-ADAQ8088EBZ, AD9681-125EBZ, and HSC-ADC-EVALEZ Connections
EVAL-ADAQ8088EBZ
SWITCHING
POWER SUPPLY
6V
AD9681-125EBZ
OPTIONAL
CLOCK SOURCE
SIGNAL GENERATOR
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.
Rev. 0 | Page 8 of 12
User Guide
WALL OUTLET
100V AC TO 240V AC
47Hz TO 63Hz
12V
HSC-ADC-EVALEZ
PC RUNNING
VISUAL ANALOG
AND SPI CONTROLLER
USER SOFTWARE