Other Parts Discussed in Thread: TLV320ADC6120
Dear Expert
1. We connected a simulated MIC at pins 1 and 2, as shown in the following figure,
In a stationary state, i.e. without external sound sources, the waveforms of BCLK-ADC, FSYNC-ADC, and SDOUT-ADC are measured as follows: the blue signal is BCLK-ADC, the yellow signal is FSYNC-ADC, and the green signal is SDOUT-ADC
My question is, why does SDOUTADAC have output without a sound source?
After zooming in on the red box, as shown in the following figure：
We grounded the input terminals, MIC-ANA+and MIC-ANA -, and still saw data output in SDOUTADAC, but it is unclear where the problem lies.
2. We used the PCM1781 chip, which is connected as follows
Our current I2S format is 32bit (high 16 bit effective), 2-channel, 16K sampling rate, and its BCLK is:
32bit * 2 * 16K=1.024MHz, as shown in the waveform diagram:
The green line represents a 16k WS clock, the blue line represents BCLK, and the yellow line represents data.
I see that your data manual states I2S, 16bit word. Our data width is 32bit, but our data is valid for high 16bit and all low 16bit values are 0. Therefore, I would like to confirm if PCM1781 can accept this data format.
