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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This is based on the availability of the components I have on hand. So to keep things simple.
Applications with noisy or high impedance power supply lines may require decoupling capacitors close to the device pins. V 3 and V 2 are the voltages at pins 3 and 2. So the entire circuit can be conveniently powered by two alkaline batteries or a single lithium cell. Figures 2 and 3. Resistance in series with the reference pins will also datzsheet CMR. This is largely attributed to the very high common-mode rejection ratio CMRR these amplifiers provide.
The output voltage is equal to the differential input volt. I tied pin 1 and pin 5 directly to the ground. Offset Voltage Trim Circuits. 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. Leave a Reply Click here to cancel reply. Notify me when new comments are added. Differential amplifier s come in handy in applications where common-mode noise and interference are present in the system.
Offset adjustment is regulated—. 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.
Original theme by srinig. Home My Youtube Channel About. The output voltage is equal to the differential input volt- age between pins 2 and 3. Basic Power and Signal Connections. Some applications, however, apply voltages to the reference terminals pins 1 and 5.
For specified dy- namic performance, pin 8 should be grounded or connected through a 0.
High Common-Mode Voltage Difference Amplifier
Some applications, however, apply voltages to the reference. Note that I substituted the resistor footprints with multiple paralleled resistors and used both through-hole and SMD footprints.
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. A more complete transfer function. Internal circuitry connected to the compensation pin 8 can- cels the parasitic distributed capacitance between the feed- back resistor, R 2and the IC substrate. Mail will not be published required. The common mode input. Reflow soldering is pretty much the only option for handling this kind of chips.
Applications with noisy or high impedance power supply lines.
INA datasheet, Pinout ,application circuits High Common-Mode Voltage Difference Amplifier
Here is the PCB I designed for this differential amplifier. 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. In the video below, I showed how to use an SMD stencil to do reflow soldering using a hotair gun. One thing worth noting is that the CMRR specified in the datasheet assumes using a low impedance source datasheet for more information.
The schematic of this differential amplifier is shown below.
INA Datasheet(PDF) – Burr-Brown (TI)
Figure 1 shows the basic connections required for operation. V 5 and V 1 are the voltages at pins 5 and 1. Internal circuitry connected to the compensation pin 8 can. To maintain high CMR, it is impor- tant to daatasheet low source impedances driving the two inputs. Most applications do not require trimming. The transfer function is: The common mode input voltage is rejected.