What is the maximum sample rate of ADC if I connect it to ESP32 through SPI?

[xien551]

Hi, everyone. I would like wire the AD7607, a 8-channel 200Ksps 16 bit adc to ESP32 by using SPI. If I using the Interrupt Transactions mode. the sample rate could reach 30Ksps. If using polling mode, the rate could be 74K, even using bus acqure, the maximun sample rate is 84K.

So if I want increase the sample rate, how should I do. And what is the up-limit of the sample rate if I using SPI-connect ADC. In addition, If I using parallel data transfer mode, what is the maximum sample rate that ESP32 supports?

Thank you!