I am now trying to accomplish a talk through program using ADAU1977(ADC), ADSP21489(DSP), and AD1934(DAC).
I have a question about register configuration of the ADC.
A little ago, I have gotten an answer from ADI that After locking PLL, I can freely configure any registers in any order.( https://ez.analog.com/thread/79520?sr=stream)
If I configure the ADC’s registers in different order just like below, the DAC output different waveform. So, I guess there is a certain order to configure them.
1.Disabling VREF and LDO then Master Power up ⇒ desirable wave form is outputted.
2.Master Power up then disabling VREF and LDO ⇒ nothing is outputted.
In terms of register configuration, I do the same on both cases.
However, the output waveforms become different if I change the configuration order.
Does this mean there is a certain sequence to take care of?