Eval ADAU1442 change clock problem
Hi,
I used the FAQ:
FAQ: How do I change the sample rate of my SigmaStudio system?
I am facing a problem when I use the sigma studio to set the Eval adau1442 to work at 96 Khz.
BCLK and LRCLK not change when I change 48 Khz to 96 Khz in sigma studio (and download it, like FAQ instructions).
At 96 kHz, according to the datasheet, page 31 and Table 18, the frequency of BCLK should be 6.144 MHz.
But in the Oscilloscope, BCLK frequency remains 3.07 MHz and LRCLK 48 Khz.
The Eval continues working normally, when it should cut the audio due to the fact of being at 96 Khz, and
ADC/DAC set to 48Khz by default (hardware).
Attached pictures of a simple project.
I will use the ADC pcm1804 and DAC pcm1690 with adau1442, the table of sampling frequecy are attached. Apparently adc will need to be clocked by 24.576 Mhz. Am i wrong?
Best Regard´s
Audio Signal Processors
adau1442
SigmaDSP Audio Processors
High dbns,
CLK Mode 0, CLK-Mode 1 and PLL0 must be low (set according Switches of SW8 on the 144x EZ-Board).
Result is a System Clock of 24 MHz, Bitclock is 12 MHz if fs = 96kHz.
Quartz Crystal = 12 MHz (or better 12,288 MHz if you need exactly 96/192 kHz)
Good Luck
ME
High dbns,
CLK Mode 0, CLK-Mode 1 and PLL0 must be low (set according Switches of SW8 on the 144x EZ-Board).
Result is a System Clock of 24 MHz, Bitclock is 12 MHz if fs = 96kHz.
Quartz Crystal = 12 MHz (or better 12,288 MHz if you need exactly 96/192 kHz)
Good Luck
ME
Im using a crystal of 12.288MHz
PLL2 = Low, PLL1 = High, PLL0 = Low.
CLKMODE0 = HIGH and CLMODE1=HIGH
And internally generate 96 Khz, and propagate fs=96Khz.
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