Part Number: TAS2505
Can you support my customer?
Question ①The TAS2505 is designed with Dual Voltage Rails that supplies AVDD and DVDD. There are two power saving modes, Standby Mode and Shutdown Mode.
Question ②The SPKP terminal / SPKM terminal and the speaker are directly connected. When the sound is not output, you can hear a "sir" sound at a low volume.Also, when you disconnect the SPK VDD power supply, you will hear a "push" sound. They think this is due to the constant output of a square wave of about 300kHz from the SPKP terminal / SPKM terminal.
Please take a look at my responses below and let me know if you have additional questions or comments.
For questions 1)
For questions 2)
Best regards,Luis Fernando Rodríguez S.
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In reply to Luis Fernando Rodriguez S.:
Thank you for supporting.
Can you answer an additional question about Standby Mode?
The customer wants to know about the difference between the two and how to use them properly.
In reply to Shotaro Sakai:
These posts refer to the standby mode. In summary, the standby mode refers to disable all the internal blocks to save the most part of power consumption. As mentioned in the two posts, there are many options that can be disabled to enable the standby mode: DAC block, Class-D driver, PLL (in case it is used to generate the sampling frequency), master reference, etc.
The difference with the shutdown mode is that the shutdown mode needs to disable the internal LDO and some external supplies to save more power.
Thank you for reply.
Do you mean the effect obtained from way of two posts is not different although the enable way is different?
Sorry for the confusion, let me clarify the correct way to enable the standby mode.
In order to enter in this mode, all the power supplies must remain enabled and stable, including the internal LDO (in case it is being used).
The blocks that must be disabled are listed below:
- DAC Channels (page 0 / register 63 / bit D7).- Master reference (page 1 / register 1 / bit D4).- Headphone output and analog inputs (page 1 / register 9 / bits D5, D1, D0).- Speaker Class-D driver (page 1 / register 45 / bit D1).
This configuration will allow to place the device in a low power consumption.
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