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  1. hex4def6

    Precision current Sensing? (100s of microamps)

    Also: Ok, so what is the correct way of doing it? My constraints on Rsense are: A) Power Consumption B) Rail tolerance C) Max / Min Vsense scale -> ADC to maximize dynamic range. I had assumed it would be better to crank the gain up on the amp, as long as I didn't saturate the ADC. Are you...
  2. hex4def6

    Precision current Sensing? (100s of microamps)

    I didn't see that table.. thanks. Can I use that amp as a current output device (rather than sticking the resistor on the output), and connect it to current-input ADC, such as: http://www.ti.com/lit/ds/symlink/ddc232.pdf ? What are the pro/cons of doing that versus using it in that manner...
  3. hex4def6

    Precision current Sensing? (100s of microamps)

    Yeah, that's what I figured as well. I think I'm going to get the high gain version of the 9934, and scale the shunts accordingly. I figure I'll get a better SNR that way. By the way, why doesn't the datasheet speak in terms of gain, rather than saying "25uA/mV" or whatever? Since the input is...
  4. hex4def6

    Precision current Sensing? (100s of microamps)

    Hi all, I'm trying to integrate some current sensing into a project. I've got about 20 shunt resistors that I want to use to measure current into various portions of my circuitry. Now, my plan is to create a daughterboard that can be attached to the mainboard to measure these currents. The...
  5. hex4def6

    Delta - Wye Transformer -- Have I spec'd correctly??

    Hello everyone, Quick question: I'm spec'ing a transformer to take an input of 277V Delta, and to output 480V Wye. Please see the attached photo, and tell me if I've made the correct choice :) One confusion I have is that the specs show the Sec. Voltage as 208Y/120 -- I assume this is for the...

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