Anthony,
I know that the development group has often used OPA227s as a buffer for the ADC. These would either drive the mux inputs directly or be placed between MUXOUT and ADCIN. The important considerations are offset (which can often be calibrated…
Jianxiong,
The maximum output current of any op amp is only limited by the short circuit limit and thermal characteristic of the package used while the output swing is a function of the power supply voltage and output current; however, you have not…
Other Parts Discussed in Thread: ISO124 , OPA227 , LM358 I have a situation where I cannot determine what is causing my iso124 op amp to fail. Its input side is powered from +/-12VDC and has an isolated +/- 12VDC converter to power its output side. The…
To
Art Kay
Respected Sir
I am a MTech student. I read your presentation on noise measurement. I am doing similar kind of noise measurement. My task is to measure 1/f noise of various opamps. So I started with uA741 opamp. I followed your steps…
Other Parts Discussed in Thread: OPA211 , OPA827 , OPA2188 , UA741 , LF356 , OP07 , TL084 To
Art Kay
Respected Sir
I am a MTech student. I read your presentation on noise measurement. I am doing similar kind of noise measurement. My task is…
Ron, et al;
This may help. It is an old (2000) presentation that I made to the Burr-Brown Field Applications Engineers (pre-TI acquisition) about using op amps as comparators.
It contains bench test data on op amps that were popular at that time…
Jon,
I doubt this is the problem, but the NJM part has almost 2 orders of magnitude higher input bias current than the recommended OPA227. Perhaps this is enough to drag down the VCOM12 and VCOM34 pins while in RESET?
Also, I think the part may…
Thomas;
This question comes up now and then, so a long time ago I created a PowerPoint presentation for our Burr-Brown field applications engineers about using op amps as comparators. You may be interested in the test data, so I'll attach it.
Op…
Other Parts Discussed in Thread: ADS1281 , OPA227 , REF02 Hi,
I'm developing a board which is based on ADS1281 ADC. The board is for research purpose in the geophysical field. I have looked at “ ADS1281EVM and ADS1281EVM-PDK User ' s Guide” as reference…
Hi Sammi,
Anything beyond about 132dB is unmeasurable. Why would you care at a gain of only 100?
To put it in perspective, 120dB is 1uV/V, 132dB is 0.25uV/V, swinging the max 5V of an OPA388 amounts to about 1uV worst case. Going a few more dB is…
