DAC I/V measurements

[bohrok2610]

You've asked that before. My reply is still the same 🙂

 

[savan]

Ah sorry I see 🙂

 

[HAYK]

Conclusion

What makes it even more remarkable is that it is a "zero-feedback" design with lower THD(+N) than high-specification op amp with feedback. Kudos to @smms73!

The circuit has very high NFB current feedback by the collector of Q19 to the input. The very high gain is due to the impedance of the CCS Q7.

These measurements are very valuable to those who design IV stage.

 

[Bảo Huy]

You've asked that before. My reply is still the same 🙂

hello my friend. i am building a ad1862 dac and pmd100. but i am not able to establish connection from i2s to pmd100. can you help me

 

[bohrok2610]

PMD100 datasheet contains examples of how to feed I2S to PMD100 from different source devices.
As I already replied to you on another thread you should also check that the system clock (MCK) for PMD100 is either 256fs or 384fs. Some USB-I2S boards (including Amanero) use 512fs MCK which does not work with PMD100. If you have an oscilloscope you should check the frequencies of LRCK and MCK.