Part Number: INA141 Other Parts Discussed in Thread: PGA204 , INA128 , INA851 Tool/software: I want to use an INA141 for a project where we will be amplifiying a ~1mV DC signal 1000x. Just wanted to make sure this chip doesn't have any DC blocking stuff…
Other Parts Discussed in Thread: INA141 Hi
If INA141 isn't being used, leaving the V+ and V- pins floating might be problematic and at the worst case it can oscillate.
Typically we've been grounding the pins through a 10K resistor when not used. …
Part Number: INA826 Other Parts Discussed in Thread: INA141 , INA818 , INA828 , INA823 Are there any tricks to compensate for the large gain drift in instrumentation amplifiers when the gain is not = 1?
Hello Paolo,
Our lowest offset instrumentation amplifier has an initial input offset voltage of 25uV+(75uV/G), which is greater than the offset you're trying to measure. So, no matter what, you will have to calibrate out the offset to use one of our…
Hello Phillip,
There is a +/-25% variation in the absolute values of the internal resistors. Using an external resistor to set the gain can therefore yield significant gain error. There is a discussion of this on page 8 of the INA141 data sheet.
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Hi Thomas,
The dc characteristics of the INA141 are all specified in the datasheet. In a gain of 10 the maximum offset voltage of the part is +/-100uV. So with a 144.7uV input signal it is possible that yes, roughly half of what you measure is due…
Hello Emmett,
Thanks for the clarification.
In that case, you may be interested in the INA141. The gain can be fixed (10 or 100). The gain drift is 10ppm/C. You may have to adjust your shunt resistor accordingly.
Hello Alberto,
If you're primarily interested in the noise and transfer function, I recommend building a discrete INA141 using ideal amplifiers and adding noise sources externally. I have created a rudimentary TINA model (attached) that seems to work…
Hi Tim,
as I thought, I have to add a DC path to ground to get correct values with the Instrumentation amp. I made a file, I have to use the INA128E model here, cause there is no INA141 model available. But it seems, there is no difference execp the…
Hello John Hardy,
a) The ISO124 can definitely provide you with isolation in the type of application you have described. The requirement of nano-amp input bias current is, however, outside of the capabilities of the part. You will need to include an…
