Audio Output Impedance of PC
I am preparing a PC for a customer who wants to know the output impedance of the audio output source. I suppose he will insure that he is connecting to a suitable load, based on this information.
I see that the computer being supplied uses a Realtek ALC1220, for which I can't find a datasheet. However, similar devices, like the ALC888 (datasheet), specify two output impedances. It specifies 1 ohm for amplified output and 100 ohms for non-amplified output. Another device is similar (1 ohm and 200 ohms) (datasheet).
My questions are: Under what circumstance does the output impedance change between amplified and non-amplified? How does this work?
The computer will have the manufacturers drivers installed, so I'm guessing this may be a case where the load is sensed, and the output impedance is determined by the results of the sensing. I'd like to know more about how this works.
audio peripherals
asked Jan 14 at 21:24
JimJim
1215
add a comment |
I am preparing a PC for a customer who wants to know the output impedance of the audio output source. I suppose he will insure that he is connecting to a suitable load, based on this information.
I see that the computer being supplied uses a Realtek ALC1220, for which I can't find a datasheet. However, similar devices, like the ALC888 (datasheet), specify two output impedances. It specifies 1 ohm for amplified output and 100 ohms for non-amplified output. Another device is similar (1 ohm and 200 ohms) (datasheet).
My questions are: Under what circumstance does the output impedance change between amplified and non-amplified? How does this work?
The computer will have the manufacturers drivers installed, so I'm guessing this may be a case where the load is sensed, and the output impedance is determined by the results of the sensing. I'd like to know more about how this works.
audio peripherals
asked Jan 14 at 21:24
JimJim
1215
add a comment |
I am preparing a PC for a customer who wants to know the output impedance of the audio output source. I suppose he will insure that he is connecting to a suitable load, based on this information.
I see that the computer being supplied uses a Realtek ALC1220, for which I can't find a datasheet. However, similar devices, like the ALC888 (datasheet), specify two output impedances. It specifies 1 ohm for amplified output and 100 ohms for non-amplified output. Another device is similar (1 ohm and 200 ohms) (datasheet).
My questions are: Under what circumstance does the output impedance change between amplified and non-amplified? How does this work?
The computer will have the manufacturers drivers installed, so I'm guessing this may be a case where the load is sensed, and the output impedance is determined by the results of the sensing. I'd like to know more about how this works.
audio peripherals
asked Jan 14 at 21:24
JimJim
1215
I am preparing a PC for a customer who wants to know the output impedance of the audio output source. I suppose he will insure that he is connecting to a suitable load, based on this information.
I see that the computer being supplied uses a Realtek ALC1220, for which I can't find a datasheet. However, similar devices, like the ALC888 (datasheet), specify two output impedances. It specifies 1 ohm for amplified output and 100 ohms for non-amplified output. Another device is similar (1 ohm and 200 ohms) (datasheet).
My questions are: Under what circumstance does the output impedance change between amplified and non-amplified? How does this work?
The computer will have the manufacturers drivers installed, so I'm guessing this may be a case where the load is sensed, and the output impedance is determined by the results of the sensing. I'd like to know more about how this works.
audio peripherals
audio peripherals
asked Jan 14 at 21:24
JimJim
1215
asked Jan 14 at 21:24
JimJim
1215
asked Jan 14 at 21:24
JimJim
1215
asked Jan 14 at 21:24
JimJim
1215
asked Jan 14 at 21:24
JimJim
1215
1215
add a comment |
add a comment |
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