ADAU1446 Max SPI speed

Hello:

We are working with the ADAU1446 processor. We are trying to work at maximun SPI speed, this should be 25Mhz for writing and 16Mhz for reading(Pg.8 Datahseet). But we are not able to reach more than 5Mhz for reading. Aparently the SPI signals look fine on the osciloscope and we don't have high capacitance in the track.

Do yo know if it's necessary to add some delay cycles for wait to the DSP to put out the data?

Thanks in advance.

Audio Signal Processors

adau1446

SigmaDSP Audio Processors