We are witnessing harmonics in ad9364 Tx output when we feed low frequency tone like 24KHz to DAC of AD9364 with 0dBFS scale(using IIO Oscilloscope). We are using the device at the sampling rate of 768KSPS(Path rates are set by using .ftr file generated using MATLAB). I've attached the plots below. Is it acceptable or do I need to change any parameters?
When I reduce the scale option to -20dBFS, my desire tone power level is reduced and along with that the harmonics also went down. Response when the scale is -20dBFS is attached below,