I'm testing fast AGC in AD9364 on CPFSK waveform and I disabled low power check(state 2A),and I also cleared the 15C[D6]. But for few frames, I'm seeing the AGC settled to a less gain for quite a time(around 200us) and after that it settled to a proper gain. I don't understand what is causing this issue?
My path rate is:
BBPLL: 1105.918 ADC: 34.560 R2:11.520 R1: 5.760 RF: 2.880 RXSAMP:0.720(all are in MHz)
The signal bandwidth is 100KHz which makes the period to (1/100KHz=)10us(considering 100KHz as the high frequency component in the band) and the RFCLK is 2.880Msps. With these information,I thought 28 samples will be enough to measure power, but I choose 5*28=140 samples for power measurement in state 5. Still I don't know, what is causing the wrong settlement of AGC.