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Ok, so when I use differential input I essentially set the window in which the analog input will be converted and as long as that window is within the absolute maximum ranges and satisfies the peak-to-peak rating it is fine.
Or if I use single ended input then I have to have my analog input...
Ok so its basically saying you have a 1V window around Vref in which the analog input will be converted.
The analog input can fall outside that window, but it won't be converted.
If the analog input falls outside the range -0.3V to 4.3V it will harm the device.
Right, but if the absolute maximum is a 4Vp-p then surely I can get a 3Vp-p without harming the device?
Here is another ADC with even lower sampling rate but it has 3Vp-p (ADS807)
Plus, I like the over-range indicator. Since my signal is being amplified by a PSoC 3 I can use this to adjust the...
What about the LTC2229
It says it has 1Vp-p to 2Vp-p yet under the Maximum ratings it says that the Analog Input voltage can be from -0.3V to Vdd+0.3V which could be as much as -0.3V to 4.3V
Why is this? I'm rather new to ADCs and am learning as I go, I figured I would want a single ended input and even if I got a differential I could tie one input to ground and have the same thing as a single ended input.
Hi there, I need help finding a high speed ADC that meets the following specs:
at least 100MSPS
analog input range of at least 3V p-p
resolution is not a factor
preferably low power
So far the only one I have found is ADS5263 by TI
https://www.ti.com/lit/ds/symlink/ads5263.pdf
But with a price...
I'm not quite sure what you mean by this. The settling time of the filter is not too important, I have actually been letting it slip to around 500 ms.
I get the 2268 because I found out that 1V on my high voltage side corresponds to 1.46mV out of my PWM.
Thus, if I would like my system to...
Ha, I'd say so. Guess I should have previewed that one.
by this you mean that I am reducing my PWM signal by a factor of 1000 correct?
If so that means my ripple will be VPWM * duty cycle / 1000 and thus a maximum of 3.3mV at 100% (PWM output is 3.3V)
Now that I have realized that I actually...
For a first order fc = 1/(2*pi*RC)
For a second order fc = 1/(2*pi*\[\sqrt{R1R2C1C2 }\]
If that is correct and I use the previous values then:
1st order:
fc1 = 1/(2*pi*2k*0.1u) = 795.77 Hz
fc2 = 1/(2*pi*1M*200p) = 795.77 Hz
2nd order:
fc = 1/(2*pi*\[\sqrt{2k * 1M * 0.1u * 200p }\] = 795.77 Hz...
How did you come up with this value? The equations I have and the website listed above each come up with 795.77 Hz
I don't think the source impedance is significant, but the load impedance I believe to be about 380k (it has a maximum capacitance of 18pF and a resistance of 320 ohms) at a...
Alright, so I changed my 1M to 40k and the 200p to 5n in my simulation, and you are right there is almost no change in the output, although this does put my 3dB point at 25 kHz which won't work for this application, it also increases my damping ratio from 1.001 to 1.025 which isn't enough to...
That is correct, I know ideally I want 0.707 < d < 1, however with this configuration d cannot go below 1 so I aim to get it as close to 1 as possible.
I did not previously know that relationship and that does help explain why the values I selected work, but using the above equations I just...
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