Hello Pierre,
Thanks for the background.
Certainly your best bet for a high-speed device from the Precision DAC team is going to be one of the unbuffered R-2R or MDAC type devices, MDACs being most preferential since the input impedance is static…
We are having the same problem, the version 9.3.50.40 SF-TI just downloaded, but we cannot open either "1130-L - Input and Output Limitations - OPA140" or "1130-L - Input and Output Limitations - OPA277". Attempting to open these files give an "FPGA_pinout…
Hello user4864313,
The input offset voltage of any op amp will be amplified by the gain used in the circuit. Since the offset voltage is seldom 0 V, but some real amount possibly as high as the maximum value, the output will not be 0 V with zero weight…
Hello, Eddie!
Be careful with this circuit. While the ADS8881 can easily resolve the differential voltages that you describe, keep in mind that the REF102 has a 10V output, at up to 10mA. If your Load has a small resistance, you could place a current…
Part Number: OPA810 Other Parts Discussed in Thread: OPA387 , OPA388 I selected OPA810 as the closest relevant part for routing purposes. We are currently seeking product selection guidance and have not finalized the amplifier architecture.
We are developing…
Hello,
The current-voltage conversion does not necessary mean having to apply a gain. It would need a resistor at the input or/and feedback of the amplifier, which by Ohm's Law can convert a current to a voltage; which you do in both circuits. I made…
Nikhil,
Your circuit requires an op amp that has a common-mode range that includes the V- power supply (ground in your case). This type of amplifier is generally called a "single supply" op amp. The OPA277 family does not meet this requirement. You…
Other Parts Discussed in Thread: OPA277 , RCV420 , TMS320F28027 hello, I have done the following circuit. I had to lift the value because to out that remains at 1.26 V at the output of RCV420 . Placing a resistance of 20k and 4.7k in the OPA277 ,the output…
Hi Mitch,
I simulated a voltage follower configuration up to 1nf and found that the op amp is likely stable, but phase margin is near 50 degree. With 2nf capacitive load, the circuit's phase margin is approx. 47 degree (you need a minimum 45 degree…
Roelof,
We have previously encountered this problem with OPA227 in certain application where a small capacitance at the output eliminates the small-level oscillation. A sure fix is to use a snubber circuit - 20ohm resistor in series with 500pF placed…
