I have downloaded the SPICE model file for the OP177 but found that it actually contains the model for the OP1177.
Where can I get the proper SPICE model file for the OP177 ?
Hello Osamu,
I will check into the power supply sequencing of the OP177 and get back to you.
Thanks,
Kris
Dear Sir/Madam,
Our customer asked th following question to me.
As for your OPAMP OP177GSZ,
your datasheet shows the adjustable offset voltage adjustment range is +/-3mV typ by adding 20kohm POT on Rp.
So if we need it +/-6mV, then what is the external…
Dear Harry,
Thanks for the informative reply. I have hit the books since your reply and made an excel sheet that incorporates all the details (input offset volts, current, input bias current, Rth of the wheatstone bridge). Waiting to get back to office…
Hi,
I use AD620 in order to amplify my loadcell signal. I have +/-15V present. I regulate these voltages to 10V and -11V. I use 10V to excite loadcell. Also I use 10V to power AD620 and OP177 op-amps. (There is a filtering circuit after AD620 with couple…
Hi again. krisf can ı ask you another question. When ı read op177 datasheet and ı see typical offset voltage is 40 uV but ı set up test circuit my offset voltage 5 mV. Maybe this is a problem. What can ı do for this.
还是上原理图吧，你用参考设计，是哪个图，说明一下
若是数据手册中的Figure 21，AD8138和基准没有关系吧，经过OP177隔离了
what is Y1 in your schematic. I do not follow exactly what you are doing but you can look at figure 36 of OP77 datasheet hwich gives you detection and amplification. You may need to do adjustment for your needs.
http://www.analog.com/en/all-operational…
最开始恒流源电路用的是op177，这个倒是很稳，但是这个不是个轨到轨输出的。 然后换了个轨到轨的AD820，板子上一共16路恒流源3V基准（图里3k实际是）1.2k电阻，正常电流应该是2.5mA，但是实际输出的啥值都有2.444，2.511······ 又换成AD8638，正常这个应该更好，失调电压更低。但是实际才2.1mA输出，郁闷···· 换回op177…