Hello Nicholas,
Though I don't support the LM devices, I do support TI's instrumentation amplifiers (INAs). For a plethora of reasons (e.g. common-mode range, noise, offset voltage, drift, PCB area, etc.) INAs are the preferred solution for this application…
Hello Nathaly,
I assume the 'Vin meas' and 'vout meas' columns are in mV, right?
I'm a little confused by the gain. In the table it is listed as ~140.9V/V. However, given R2=21.2k and R1=1k, the gain should be ~111V/V.
My next recommendation…
Hello Matt,
The INA331 is operating on the edge of linearity when used in low-side current sensing (please see common-mode input range vs reference voltage plot on page 5 of the data sheet).
Given that this is a low-side measurement and that no reference…
Hello Nir,
Assuming the common-mode voltage of your Wheatstone bridge is near mid-supply (e.g. 2.5V with a 5V supply), you can use an instrumentation amplifier. You could use the INA326 in such a configuration (assuming a 5V single supply). Concerning…
Hello Bob,
Thanks for the compliment!
You could reduce R2 as low as 100kohms. If that is not acceptable, perhaps you'd be interested in a different approach using a 2 or 3 op amp IA. The issue there is that you may have an output swing limitation…
Nathan;
I agree with the previous posts, breaking up the gain into two stages will allow you to achieve greater bandwidth so that the transient response will be OK for your application. An INA163 is a good choice if you have dual supplies but it is…
Hello John,
Good to hear it's working as intended!
The selection of the INA depends on a number of things. What is special about the INA125 is the integrated bridge reference voltage. If you don't need it (or want to use an precision external reference…
Part Number: INA818 Other Parts Discussed in Thread: INA823 Tool/software: Hi,
I need a differential to single-ended converter. The input signal has 1MHz bandwidth and a Vcm=1.65V, Vmax 3V, Vmin 0.5V.
The output is connected to an ADC of a uC, power…
Siauhwa,
In addition to John's recommendation, THS4521 is a rail-to-rail output fully differential amplifier. If you do not require fully differential output, we offer a number of INA’s from low voltage single supply, INA321 and INA331 , to dual supply…
Hello Kavindu,
Here is a list of commercial grade devices that have operating temperatures from -55C to 125C:
INA121 INA126 INA155 INA156 INA321 INA322 INA331 INA332
As a benchmark, the INA331's 1/f noise is 7uVpp and at 1kHz the noise density is…
