Hello everyone!
I have ventured into a part of electronics I am not familiar at all - namely digital audio potentiometers. I'm planning a project that interfaces a DS1801 digital audio pot in between a computer's speaker output and a TEA2025 power amplifier, which itself drives two 4 ohm speakers. Other than the datasheet I have not found too much on the internet about the DS1801 (I was hoping to find a general app note). I found however a design note where the wiper outputs are buffered with rail-to-rail op amps. The schematic of the design note only shows that the buffered output is going to some connectors, so I can't deduce if the need for buffering applies to my own case too. The TEA2025 has a relatively high input impedance of 30k, based on that information only, I would hesitate to use any kind of buffering because I think it's irrelevant in the case of such a high input impedance and I'm afraid it would cause unwanted signal distortion. I'm attaching datasheets for the TEA2025 and the DS1801 and I also attach the design note I found.
I have to add I'm planning to connect the DS1801 and it's controlling MCU to a 5V supply while the TEA2025 would be fed from a 12V supply.
My questions are: Do I have to use a buffering op amp in my case and if yes, should I connect it to the 12V or the 5V supply?
Thank you for the help in advance!
I have ventured into a part of electronics I am not familiar at all - namely digital audio potentiometers. I'm planning a project that interfaces a DS1801 digital audio pot in between a computer's speaker output and a TEA2025 power amplifier, which itself drives two 4 ohm speakers. Other than the datasheet I have not found too much on the internet about the DS1801 (I was hoping to find a general app note). I found however a design note where the wiper outputs are buffered with rail-to-rail op amps. The schematic of the design note only shows that the buffered output is going to some connectors, so I can't deduce if the need for buffering applies to my own case too. The TEA2025 has a relatively high input impedance of 30k, based on that information only, I would hesitate to use any kind of buffering because I think it's irrelevant in the case of such a high input impedance and I'm afraid it would cause unwanted signal distortion. I'm attaching datasheets for the TEA2025 and the DS1801 and I also attach the design note I found.
I have to add I'm planning to connect the DS1801 and it's controlling MCU to a 5V supply while the TEA2025 would be fed from a 12V supply.
My questions are: Do I have to use a buffering op amp in my case and if yes, should I connect it to the 12V or the 5V supply?
Thank you for the help in advance!
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