Simple, ugly DAC

beamnet · 3rd April 2006, 02:00 PM

Hi,

i just made the PCM2707 work to get i2s from USB.

I am not looking at anything fancy, i just want a USB input on my DIY Tube amp. I have AD1852/3 and AD1955 to get it to audio.

Can the AD1955 be implemented without the serial programming?

Bas

andrei · 4th April 2006, 04:49 AM

Well, PCM2707 has an analog output (although it is fairly crappy from looking at the datasheet). You'll need MCU to program AD1955, but it comes up in I2S configuration by default, so it is probably can be interfaced with PCM2707. Another Alternative is PCM1794, which has hardware control.

beamnet · 4th April 2006, 11:08 AM

I am currently leaning towards the internal DAC for simplicity, as al the DAC's require big output circuitry.

Or is there a possible 1 opamp I/V or so? Don't need the high pass, as it won't pass my output transformer anyway

Bas

andrei · 4th April 2006, 11:54 PM

You can do I/V conversion with a single differential THS4130/OPA1632 opamp per channel. Or you could do passive I/V convesion with a step-up transformer...

3rd April 2006, 02:00 PM	#1
beamnet diyAudio Member Join Date: Jun 2004 Location: enschede	Simple, ugly DAC Hi, i just made the PCM2707 work to get i2s from USB. I am not looking at anything fancy, i just want a USB input on my DIY Tube amp. I have AD1852/3 and AD1955 to get it to audio. Can the AD1955 be implemented without the serial programming? Bas

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4th April 2006, 04:49 AM	#2
andrei diyAudio Member Join Date: Dec 2002 Location: Canada	Well, PCM2707 has an analog output (although it is fairly crappy from looking at the datasheet). You'll need MCU to program AD1955, but it comes up in I2S configuration by default, so it is probably can be interfaced with PCM2707. Another Alternative is PCM1794, which has hardware control.

4th April 2006, 11:08 AM	#3
beamnet diyAudio Member Join Date: Jun 2004 Location: enschede	I am currently leaning towards the internal DAC for simplicity, as al the DAC's require big output circuitry. Or is there a possible 1 opamp I/V or so? Don't need the high pass, as it won't pass my output transformer anyway Bas

4th April 2006, 11:54 PM	#4
andrei diyAudio Member Join Date: Dec 2002 Location: Canada	You can do I/V conversion with a single differential THS4130/OPA1632 opamp per channel. Or you could do passive I/V convesion with a step-up transformer...

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