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ADC32RF45: ADC32RF80 Intervening spur?

Part Number: ADC32RF45
Other Parts Discussed in Thread: ADC32RF80

DEARS.

The ADC32RF80 is being tested on the customer's board.
The setting values of the ADC32RF80 are as follows.
Fs = 1500M
Decimation = 4
LMFS = 4421

Spurs occur at fs / 8 and fs / 4.
Spur is being tested using the Freeze function.
Freeze increases the spur level.
In addition to the Freeze function, how can I improve spur?

using Freeze.

Not using Freeze.

Thank you.