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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The output voltage is equal to the differential input volt. V 5 and V 1 are the voltages at pins 5 and 1. Notify me when new comments are added. Most applications do not require trimming. Figure 1 shows the basic connections required for operation. 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. Although the offset voltage and CMRR can be trimmed by adding external resistor networks between pin 1 lna117 pin 5, by default the amplifier is accurate enough for most of the applications I have in mind.
Offset Voltage Trim Circuits.
INA117 Datasheet PDF
This is based on the availability of the components I have on hand. 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. Offset adjustment is regulated—. Figures 2 and 3 show optional circuits that may be used for trimming offset voltage and common-mode rejection. Resistance in series with the reference pins will also degrade CMR.
A more complete transfer function is: Some applications, however, apply voltages to the reference terminals pins 1 and 5. Resistance in series with the reference pins will also degrade. In the video below, I showed how to use an SMD stencil to do reflow soldering using a hotair gun. I tied pin 1 and pin 5 directly to the ground.
This is largely attributed to the very high common-mode rejection ratio CMRR these amplifiers provide. V 3 and V 2 are the voltages at pins 3 and 2.
High Common-Mode Voltage Difference Amplifier
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. Reflow soldering is pretty datashet the only option for handling this kind of chips.
The schematic of this differential amplifier is shown below. Figures 2 and 3. Original theme by srinig. To maintain high CMR, it is impor.
Note ina171 I substituted the resistor footprints with multiple paralleled resistors and used both through-hole and Inna117 footprints. Applications with noisy or high impedance power supply lines may require decoupling capacitors close to the device pins. Internal circuitry connected to the compensation pin 8 can- cels the parasitic distributed capacitance between the feed- back resistor, R 2and the IC substrate.
So to keep things simple. Applications with noisy or high impedance power supply lines. For specified dy- namic performance, pin 8 should be grounded or connected through a 0. Mail will not be published required.
INA datasheet, Pinout ,application circuits High Common-Mode Voltage Difference Amplifier
Most applications use the INA as a simple unity-gain. A more complete transfer function. Basic Power and Signal Connections. The output voltage is equal to the differential input volt- age between pins 2 and 3. Home My Youtube Channel About.