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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So to keep things simple. This is largely attributed to the very high common-mode rejection ratio CMRR these amplifiers provide. Although the offset voltage and CMRR can be trimmed by adding external resistor networks between pin 1 and pin 5, by default the amplifier is accurate enough for most of the applications I have in mind.

A more complete transfer function. Reflow soldering is pretty much the only option for handling this kind of chips. In the video below, I showed how to use an SMD stencil to do reflow soldering using a hotair gun. 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. Mail will not be published required. Leave a Reply Click here to cancel reply. Some applications, however, apply voltages to the reference.


The output voltage is equal to the differential input volt. The output voltage is equal to the differential input volt- age between pins 2 and 3.

Kerry D. Wong » Blog Archive » A Differential Amplifier Based on INA

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. To maintain high CMR, it is impor- tant to have low source impedances driving the two inputs.

This is based on the availability of the components I have on hand. Some applications, however, apply voltages to the reference terminals pins 1 and 5. Applications with noisy or high impedance power supply lines. Figures 2 and 3 show optional circuits that may be used for trimming offset voltage and common-mode rejection. Offset adjustment is regulated—.

INA datasheet, Pinout ,application circuits High Common-Mode Voltage Difference Amplifier

Figures 2 and 3. One thing worth noting is that the CMRR specified in the datasheet assumes using a low impedance source datasheet for more information.

V 5 and V 1 are the voltages at pins 5 and 1. According to datasheet, the typical offset voltage without any adjustment is only at around 0. The common mode input voltage is rejected.


Figure 1 shows the basic connections required for operation. I tied pin 1 and pin 5 directly to the ground. To maintain high CMR, it is impor.

Resistance in series with the reference pins will also degrade. The common mode input. Most applications use the INA as a simple unity-gain. Most applications do not require trimming. Offset Voltage Trim Circuits.

The schematic of this differential amplifier is shown below.

A more complete transfer function is: Here is the PCB I designed for this differential amplifier. The supply voltage to the LT is very flexible and can be powered between 2. Basic Power and Signal Connections. For specified dy- namic performance, pin 8 should be grounded or connected through a 0.

High Common-Mode Voltage Difference Amplifier

Internal circuitry connected to the compensation pin 8 can. Original theme by srinig. The transfer function is: Adtasheet the entire circuit can be conveniently powered by two alkaline batteries or a single lithium cell. Note that I substituted the resistor footprints with multiple paralleled resistors and used both through-hole and SMD footprints.