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TAS5717 - DC Detection
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Q: TAS5717 - DC Detection.
As I remember TAS5717 with DC detection, am I right? If yes, pls provide detail DC protection data to us due to I cannot get ant information in d/s.
Q: Re: TAS5717 - DC Detection.
HelloYes, that is exactly what it will detect: stuck (high or low) PWM. As I mentioned, we send it constant value (DC) to SDIN then read register 0x02 bit 0. Customer can do the same with DC component in SDIN data.
Q: Re: TAS5717 - DC Detection.
Please let me clarify for you register 0x03 and 0x46 functions.
0x03 : 1st order HPF with Fc at 1Hz, automatically block DC components in the data stream - no users' interactions.
0x46: PWM maximum duty cycle detection. Needs external MCU to poll 0x02 bit 0 for error and then MCU needs to reset or shutdown system when error occurs.
You can test 0x03 using the AP with SPECIAL digital output signal. Turn HPF on and do a frequency sweep, then measure again with HPF turned off.
You can also test 0x46 the same way - be sure to turn off HPF 0x03. Then use SPECIAL digital output signal from the AP and then read the 0x02 bit 0 for error. Make sure no loads or speakers are attached.
Here's the AP SPECIAL digital signal setup.
As mention 0x46 bit 10 can enable DC bllocking, but how about 0x03 bit7? It also describe enable DC blocking, what different betwen 0x03 and 0x46?
The DC blocking filter is after all other audio processing blocks to prevent DC from all potential sources.
Like he mentioned, It is a a first-order, digital, high-pass filter The filter –3-dB point is approximately 1Hz.
I suggest, tell your customer that we have DC blocking filter after DAP (digital audio processor) and give the paramters. DC filter sits just before PWM block.
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