Instrumentation Amplifiers (INAs) have often been placed side-by-side with the precision Operation Amplifiers (Op-Amps), in a move to prove how the latter is better than the former. Going by some of the information out there, the Op-Amps are said to be better than the INAs because of the higher accuracy they offer.
We would like to think of this based on the applications, as we have seen that the INA163UAE4 can offer a higher accuracy. Read this article to the end to find out just how it pans out.
How INA163UAE4 Offers Excellent Accuracy
If the claims that INA163UAE4 is an accurate-centric Instrumentation Amplifier (INA) is to be taken seriously, it is expedient to highlight how it is done.
It is in light of this that we have broken down some of the processes involved in attaining the excellent accuracy:
1. Through the Gain Setting
The gain, an important element in how an amplifier functions, is one of the contributing factors to INA163UAE4’s improved accuracy. In this case, it has to be selected with a jumper connection and the outcome should be at least 10V/V.
Besides, the gain setting often features the enablement of low series resistance on the jumper connection. It is through this resistance setting that INA163UAE4 uses the resistance of 0.5Ω to decrease the gain by 0.1%.
2. Operating Temperature and Amplifier Availability
Some amplifiers are optimized for use with specific applications and in these cases, they tend to have one package.
On the contrary, INA163UAE4 is versatile both in terms of the operating temperature and the package it uses. Ideally, it can be packaged in either the SO-8 surface-mount package or the 8-pin plastic DIP.
For the operating temperature, it works with a minimum of -40˚C and a maximum of 85˚C.
INA163UAE4 is a Multi-Application INA
Just like some Instrumentation Amplifiers (INAs) are reputed for only supporting a few use cases, the INA163UAE4 supports many.
The multi-application supports stems from the smaller package size and the 3-op amplifier design.
The versatility also enables the INA163UAE4 to be used for a wide range of general-purpose applications.
INA163UAE4 Uses Less Power
INA163UAE4 is one of the low-power Instrumentation Amplifiers (INAs) you can find there – and this is supported in different frontiers.
For example, it supports multiple low-power variants, which are further classified based on the target applications. There is the 750µA quiescent current used for the battery-powered applications; the 50µV low-offset voltage, the 117dB at G = 100 used for the high common-mode rejection applications; and the 0.5µV/˚C for drift.
Support for Wider Bandwidths
While some INAs may be unable to function perfectly when the gain is high, INA163UAE4 does the opposite. It can operate optimally even on a higher gain because of the current-feedback input circuitry that provides a wider bandwidth.
INA163UAE4 Protects the Inputs
Protective features on the INA163UAE4 also channel towards the inputs. Due to the voltages involved, the inputs might get damaged in the process. It is in light of this that INA163UAE4 enables a wide range of protective measures to keep the inputs safe, even if the voltages clock up to ±40+.
It is important to mention here that the input protective offered here is individual and aims at keeping each of the inputs safe in cases of low voltage or overvoltage.
Below are some of the additional information about how the input voltage protection works:
3. Protection in the Absence of Power
The input protection is offered, irrespective of the absence of power supply on the amplifier, either because of turning off the power source or disconnection.
4. Input Current Limit Behavior
Although INA163UAE4 aims at protecting the inputs even if there is a condition of +40V on one input and -40V on the other, it does so with some considerations.
It wouldn’t be flexible to implement the input protection when there is a need to provide equivalent protection for the inputs.
It is in light of this that INA163UAE4 avoids doing so as it could lead to excessive noise, contributed by the series input resistors.
A better way to tackle this would be to use the protection circuitry to limit the input current to a “safe value” estimated at about 1.5 mA (minimum) and 5 mA (maximum).
Advantages of Instrumentation Amplifiers (INAs)
Instrumentation Amplifiers (INAs) like INA163UAE4 have several benefits that you want to know. At the core of these benefits is the operational model that involves the amplification of the “small differential signals.”
These small differential signals are the signals with a slight difference by the time the INAs gets into full operation. Ideally, the INAS have to compare the signals in the inputs and cancel out or remove the ones that have the same potential as the signals on the other input.
It is on this basis that the small difference in the signals is used as a factor for canceling out the other signal.
Now, here are some of the major benefits of the INA163UAE4 Instrumentation Amplifier (INA):
5. High Common-Mode Rejection
The common-mode rejection on INA163UAE4 and all other INA is quite high. But what is a common-node rejection and why does it matter?
Common-Mode Rejection or CMR is an important function of an Instrumentation Amplifier as it helps in “canceling out” or removing the signal that corresponds to what is obtainable in the other input.
The high rate of the CMR rejection is therefore, because of the higher value of the Common-Mode Rejection Ratio (CMMR) of the Operational Amplifier (Op-Amp) 3.
6. INAs are Ideal for Stable-Centric Applications
Applications or devices requiring a higher stability and or tedious uses tend to use the Instrumentation Amplifiers (INAs).
That is why we have the INA163UAE4 typically used with high-end, bio-medical applications, including EEG and ECG.
The INAs are also ideal for use with the applications that require a longer shelf-life. Thus, INA163UAE4 can also be used with automotive devices and a wide range of other industrial applications.
Final Thoughts on INA163UAE4
INA163UAE4 is that type of Instrumentation Amplifier (INA) you need when looking to adjust or modify the gain of an amplifier circuit. With it, you don’t necessarily need to change more than a resistor value to get the job done – and in real-time too.