Hi, Steve
Nice to talk with you and thanks so for your reply.
My timings are attached for your reference. After debug, I can write and read the gain code correctly through the timing. But the gain is not measured as specified in the datasheet. The gain is linear when changing the code. But the gain range is just -14.5～21.4dB.
Is the problem from impedance matching or any other hardware desgin?
Thanks!
Br,
Wayne