Hello, I am new to this area.
I am using AD1974 with a stm32f401 mcu, I need to configure an sampling frequency of 8kHz and 16kHz in my application of audio in.
However in the datasheet of ad1974, I found there are no such option in adc control 0 register.
ADC Control 0 [7:6]
00 32 kHz/44.1 kHz/48 kHz
01 64 kHz/88.2 kHz/96 kHz
10 128 kHz/176.4 kHz/192 kHz
And I checked here and found similar problem about ad1937. So I do it as following:
PLLCC0: 0x81 (Enable ADC, PLL disabled)
PLLCC1: 0x03 (Clock sources = MCLK)
And now if I want to configure a 16khz sampling rate. Since I select a INPUT 256 (×44.1 kHz or 48 kHz) as default. I need to provide a mclkin of 256*16k = 4Mhz. Is it correct?