Greetings,
I would like to ask about why a groundless weird sine wave out at HPLOUT/HPRROUT in AIC3105 is generated.
We have two products, which use AIC3105.
OSBE-2100 product
- A groundless sine wave of 602 kHz is observed at HPLOUT/HPROUT in AIC3105 when DAC_L2/DAC_R2 is used.
- This sine wave disappears when DAC_L1/DAC_R1 is used.
- white noise is heard when we use DAC_L2/DAC_R2 is used, which disappears when DAC_L1/DAC_R1 is used.
- Please see the attached capture of oscilloscope and schematic.
- REG-95.{D6, D7} HPROUT/ HPLOUT is read as 1.
- REG-97.{D6, D7} HPROUT 과 HPLOUT is read as 1.
- OSBE-2300 product
- Exactly the same schematic is used in OSBE-2300, where no sine wave is observed whether we use DAC_L2 or DAC_L1.
- REG-95.{D6, D7} HPROUT/ HPLOUT is read as 0.
- REG-97.{D6, D7} HPROUT 과 HPLOUT is read as 0.