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 adjustment is regulated—. The transfer function is: Here is the PCB I designed for this differential amplifier.
This is based on the availability of the components I have on hand. Offset Voltage Trim Circuits. The supply voltage to the LT is very flexible and can be powered between 2. Figures 2 and 3 show optional circuits that may be used for trimming offset voltage and common-mode rejection. Figure 1 shows the basic connections required for operation. The output voltage is equal to datasheef differential input volt- age between pins 2 and 3. Internal circuitry connected to the compensation pin 8 can- cels the parasitic datashdet capacitance between the feed- back resistor, R 2and the IC substrate.
Mail will not be published required. The output voltage is equal to the differential input volt. Resistance in series with the reference pins will also degrade. Note that I substituted the resistor footprints with multiple paralleled resistors and used ina1177 through-hole and SMD footprints.
V 3 and V 2 are the voltages at pins 3 and 2. In the video below, I showed how to use an SMD stencil to do reflow soldering using a hotair gun. Applications with noisy or high inq117 power supply lines. So the entire circuit can be conveniently powered by two alkaline batteries or a single lithium cell.
High Common-Mode Voltage Difference Amplifier
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. Most applications do not require trimming. Reflow soldering is pretty much the only option for handling this kind of chips. Resistance in series with the reference pins will also degrade CMR.
According to datasheet, the typical offset voltage without any adjustment is only at around 0. Applications with noisy or high impedance power supply lines may require decoupling capacitors close to the device pins. Home My Youtube Channel About. The schematic of this differential amplifier is shown below. Leave a Reply Click here to cancel reply.
For specified dy- namic performance, pin 8 should be grounded or connected through a 0.
Figures 2 and 3. Some applications, however, apply voltages to the reference.
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Although the offset voltage and CMRR can dayasheet trimmed by adding external resistor networks between pin 1 and pin 5, by default the amplifier is accurate enough for most datashret the applications I have in mind. A more complete transfer function. 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.
Some applications, however, apply voltages to the reference terminals pins 1 and 5.
INA117 Datasheet PDF
So to keep things simple. The common mode input. A more complete transfer function is: 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. The common mode input voltage is rejected. I tied pin 1 and pin 5 directly to the ground. Original theme by srinig. 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. To maintain high CMR, it is impor.
INA Datasheet(PDF) – Burr-Brown (TI)
To maintain high CMR, it is impor- tant to have low source impedances driving the two inputs. Differential amplifier s come in handy in applications where common-mode noise and interference are present in the system. Most applications use the INA as a simple unity-gain. Notify me when dataaheet comments are added. Basic Power and Signal Connections.