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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Offset Voltage Trim Circuits. Reflow soldering is pretty much the only option for handling this kind of chips. Internal circuitry connected to the compensation pin 8 can. V 3 and V 2 are the voltages at pins 3 and 2. Basic Power and Signal Connections. Applications with noisy or high impedance power supply lines. I tied pin 1 and pin 5 directly to the ground.
The common mode input voltage is rejected. Mail will not be published required. In the video below, I showed how to use an SMD stencil to do reflow soldering using a hotair gun. Some applications, however, apply voltages to the reference terminals pins 1 and 5. For specified dy- namic performance, pin 8 should be datasheeh or connected through a 0. V 5 and V 1 are the voltages at pins 5 and 1.
Resistance in series with the reference pins will also degrade CMR. So the entire circuit adtasheet be conveniently powered by two alkaline batteries or a single lithium cell. The schematic of this differential amplifier is shown below.
INA117 Datasheet PDF
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. This is based on the availability of the components I have on hand.
Most applications use the INA as a simple unity-gain. Most applications do not require trimming. A more complete transfer function is: 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. This is largely attributed to the very high common-mode rejection ratio CMRR these amplifiers provide.
Internal circuitry connected to the compensation pin 8 can- cels the parasitic distributed capacitance between the feed- back resistor, R 2and the IC substrate. The transfer function is: 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.
To maintain dwtasheet CMR, it is impor- tant to have low source impedances driving the two inputs. Resistance in series with the reference pins will also degrade. According to datasheet, the typical offset voltage without any adjustment is only at around 0.
INA Datasheet(PDF) – Burr-Brown (TI)
Differential amplifier s come in handy in applications where common-mode noise and interference are present in the system. So to keep things simple. Some applications, however, apply voltages to the reference. Offset adjustment is regulated—. 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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To maintain high CMR, it is impor. Applications with noisy or high impedance power supply lines may require decoupling capacitors close to the device pins.
The output voltage is equal to the differential input volt. Figure 1 shows the basic connections required for operation. Figures 2 and 3 show datasheeg circuits that may be used for trimming offset voltage and common-mode rejection. Original theme by srinig. 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.
Note that I substituted the resistor footprints with multiple paralleled resistors and used both through-hole and SMD footprints. Figures 2 and 3. Home My Youtube Channel About. The common mode input. Notify me when new comments are added. The output voltage is equal to the differential input volt- age between pins 2 and 3.