Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

Low value R "I/V" with the PCM1738...
Low value R "I/V" with the PCM1738...
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 19th June 2005, 09:32 PM   #1
AW is offline AW  New Zealand
diyAudio Member
Join Date: Jan 2004
Location: Europe
Default Low value R "I/V" with the PCM1738...

...type of DAC?

Older Iout DACs were ground referenced so it was easy - but these things sit the Iouts up at half rail - which makes life a tad difficult if you want to do it KISS style.

I can see how to do it differentially - by running the R between the + and - current outputs and taking a differential signal from across them - but without using an opamp (which I hate) or a transformer (which I also hate - but not as much as opamps) it's more complex than i wany.

And you can't take the R to gnd and have the DAC survive - don't ask me how I know...

Anyone made this work simply?

  Reply With Quote
Old 19th June 2005, 09:45 PM   #2
Jocko Homo is offline Jocko Homo  United States
Join Date: Feb 2002
Location: As far from the NOSsers as possible
Somehow I don't think that they had KISS in mind when they designed it...............

I suppose that you could make a voltage reference, bias it up at Vcc/2......isolate it with a big resistor..............tie that to 2 smaller I/V resistors tied together...take the other end of them to the +/- outputs.

But I would go for active stage that didn't need an op-amp, because that is what I do best.

BTW.......I know that some DACs won't work if you don't use a load to ground. Don't ask how I found out by forgeting to hook up which wire and when................

  Reply With Quote


Low value R "I/V" with the PCM1738...Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
What Does Fostex "Rated Input" and "Music Power" mark02131 Full Range 5 13th October 2012 06:18 AM
What makes an amplifier "bright", "warm", or "neutral"? JohnS Solid State 51 13th December 2009 07:42 PM
What makes Nichicon "muse"/"for audio" caps different ? percy Parts 2 3rd October 2009 06:53 PM
Some final pics of "Stacks" revisited and "Askew" with stand Andy G Multi-Way 2 3rd February 2005 07:07 AM
Anyone used Scan-Speak's "Flow Resistors" or "Aperiodic Vents"? Ignite Multi-Way 3 18th November 2001 09:42 AM

New To Site? Need Help?

All times are GMT. The time now is 09:38 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio