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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Basic Power and Signal Connections. V 5 and Datsheet 1 are the voltages at pins 5 and 1. Internal circuitry connected to the compensation pin 8 can- cels the parasitic distributed capacitance between the feed- back resistor, R 2and the IC substrate.
V 3 and V 2 are the voltages at pins 3 and 2. Some applications, however, apply voltages to the reference. The output voltage is equal to the differential input volt- age between pins 2 and 3. 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. Some applications, however, apply voltages to the reference terminals pins 1 and 5.
Resistance in series with the reference pins will also degrade CMR. Applications with noisy or high impedance power supply lines. I tied pin 1 and pin 5 directly to the ground. Applications with noisy or high impedance power supply lines may require decoupling capacitors close to the device pins. Note that I substituted the resistor footprints with multiple daatasheet resistors and used both through-hole and SMD footprints. A more complete transfer function. 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.
INA Datasheet(PDF) – Burr-Brown (TI)
According to datasheet, the typical offset voltage without any adjustment is catasheet at around 0. To maintain high CMR, it is impor- tant to have low source impedances driving the two inputs.
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. Most applications do not require trimming. So the entire circuit can be conveniently powered by two alkaline batteries or a single lithium cell. Offset Voltage Trim Circuits. The output voltage is equal to the differential input daatasheet. One thing worth noting is that the CMRR specified in the datasheet assumes using a low impedance source datasheet for more information.
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INA datasheet, Pinout ,application circuits High Common-Mode Voltage Difference Amplifier
In the video below, I showed how to use an SMD stencil to do reflow soldering using a hotair gun. The schematic of this differential amplifier is shown below. Original theme by srinig. Figure 1 shows the basic connections required for operation. Differential amplifier s come in handy in applications where common-mode noise and interference are present in the system.
INA117 Datasheet PDF
The common mode input voltage is rejected. Internal circuitry connected to the compensation pin 8 can. A more complete transfer function is: The transfer function is: This is based on the availability of the components I have on hand.