Hi all.
I wanted to test the codec TLV320AIC1110 before using it in own design. And got such problem.
- Registers are: 9B 03 40 A0 00 00 00 (MIC1 select, EAR1 select, Linear mode, filters - off)
- On MIC1 inputs sine wave 75..3400 HZ (about 20mV)
- Digatal data is loops PCM_OUT to PCM_IN
- On EAR1_ON-EAR1_OUT - earphone and oscilloscope
- PCM_CLK and MCLK are connected to one wire 2048MHz, PCM_SYN - every 256 CLKS, 8kHz
So, i see distrotion of sine wave on outpurs (see pic.). It is not ideal sine.
Interval of such "steps" is about 20uS.
If sine freq=1000Hz then distortion (steps) are not so noticeable, but I see them
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Then I increase clocks (PCM_CLK and MCLK) up to 8MHz, "steps" became shorter (on 2MHz - 20us, on 8MHz - 5us).
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Anybody can generate sine wave 3 kHz and watch it?
