The INA is a precision unity-gain difference amplifier with very high common- mode input voltage range. It is a single monolithic IC consisting of a precision. Texas Instruments INA Series Differential Amplifiers are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for Texas Instruments . AD vs. INA Error Budget Analysis Example 1 (VCM = V dc). Error, ppm of FS. Error Source. AD INA AD INA ACCURACY, TA = 25° C.

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Home My Youtube Channel About. Most applications use the INA as daasheet simple unity-gain. V 5 and V 1 are the voltages at pins 5 and 1. Differential amplifier s come in handy in applications where common-mode noise and interference are present in the system. Applications with noisy or high impedance power supply lines.

High Common-Mode Voltage Difference Amplifier

Internal circuitry connected to the compensation pin 8 can- cels the parasitic distributed capacitance between the feed- back resistor, R 2and the IC substrate. Note that I substituted the resistor footprints with multiple paralleled resistors and used both through-hole and SMD footprints.

Reflow soldering is pretty much the only option for handling this kind of chips. This is based on the availability of the components I have on hand.


The output voltage is equal to the differential input volt- age between pins 2 and 3. Here is the PCB I designed for this differential amplifier. Offset Voltage Trim Circuits. So to keep things simple. The common mode input. Figures 2 and 3. The supply voltage to the LT is very flexible and can be powered between 2.

In the video below, I showed how to use an SMD stencil to do reflow soldering using a hotair gun. Figures 2 and 3 show optional circuits that may be used for trimming offset voltage and common-mode rejection.

Mail will not be published required. Offset adjustment is regulated—. So the entire circuit can be conveniently powered by two alkaline batteries or a single lithium cell.

Some applications, however, apply voltages to the reference terminals pins 1 and 5. Basic Power and Signal Connections. The common mode input voltage is rejected. Some applications, however, apply voltages to the reference. And because of the high CMMR they are well suited in high-side current measurement applications and in situations where voltages must be measured deferentially. The schematic of this differential amplifier is shown below.

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To maintain high CMR, it is impor. For specified dy- namic performance, pin 8 should be grounded or connected through a 0. To maintain high CMR, it is impor- tant to have low source impedances driving the two inputs.

Figure 1 shows the basic connections required for operation. Although the offset voltage and CMRR can be trimmed by adding external datashest networks between pin 1 and pin 5, by default the amplifier is accurate enough for most of the applications I have in mind.

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I tied pin 1 and pin 5 directly to the ground. A more complete transfer function is: The transfer function is: Resistance in series with the reference pins will also degrade CMR.

Notify me when new comments are added. The output voltage is equal to the differential input iba117. Since this design was meant to serve as a building block for other circuits, no impedance matching resistors are incorporated on the input side and no additional signal amplification is provided. Resistance in series with the reference pins will also degrade.