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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Re: IV conversion for 1704 DAC posted by iza on August 10, 2001 at 09:51:13:
I'm not sure what you mean by sum and provide gain. You can configure the opamp to do the I/V conversion as an integrator with an appropriate feedback resistor for the output voltage you want and provide a virtual ground for the DAC. Most people using a resistor follow it with some kind of a discrete gain stage since the main goal (IMO) is to avoid using an opamp. I'm not sure that with the modern and extremely fast current feedback opamps which are readily available that you gain anything using a resistor for I/V conversion in an opamp based system because of the penalty you pay for having voltage on the output of the DAC.But in any case, if you are using the opamp strictly as a voltage gain stage following the I/V conversion resistor, I still believe that the lowest value possible sounds best (and 50 ohms will lead to 60 mV on the output of the DAC at full output - some of the DACs are specified for less than 10mV to maintain linearity spec). It's easy to experiment though and everyone should try it for themselves if interested. Just remember to carefully match levels in a way that doesn't adversely affect the sound when comparing.
Dave
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Follow Ups
- Re: IV conversion for 1704 DAC - Dave I 10:55:23 08/10/01 (1)
- Re: IV conversion for 1704 DAC - iza 12:18:37 08/10/01 (0)
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