AD9361 book write about:Channel bandwidths from less than 200 kHz to 56 MHz are supported.
My question is : my tx rate is 128KHz,can I use this chip(AD9361). And my receive rate is 8MHz.
With your constraints you will have to have 8MHz Rx rate and you have a choice of either 4MHz or 8MHz Tx rate. The part cannot support 8MHz Rx and 128kHz Tx rate.
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