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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Notify me when new comments are added. The supply voltage to the LT is very flexible and can be powered between 2. V 3 and V 2 are the voltages at pins 3 and 2. Most applications do not require trimming. This is based on the availability of the components I have on hand. Internal circuitry connected to the compensation pin 8 can. Resistance in series with the reference pins will also degrade CMR. Mail will not be published required. For specified dy- namic performance, pin 8 should be grounded or connected through a 0.
This is largely attributed to the very high common-mode rejection ratio CMRR these amplifiers provide. Offset adjustment is regulated—. Leave a Reply Click here to cancel reply.
Resistance in series with the reference pins will also degrade. Offset Voltage Trim Circuits.
Basic Power and Signal Connections. The schematic of this differential amplifier is shown below. So the entire circuit can be conveniently powered by two alkaline batteries or a single lithium cell.
The common mode input voltage is rejected. Note that I substituted the resistor footprints with multiple paralleled resistors and used both through-hole and SMD footprints.
One thing worth noting is that the CMRR specified in the datasheet assumes using a low impedance source datasheet for more information. Figures 2 and 3 show optional circuits that may be used for trimming offset voltage and common-mode rejection. So to keep things simple.
Kerry D. Wong » Blog Archive » A Differential Amplifier Based on INA
Applications with noisy or high impedance power supply lines may require decoupling capacitors close to the device pins. Home My Youtube Channel About.
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 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. Original theme by srinig. Some applications, however, apply voltages to the reference.
A more complete transfer function is: Most applications use the INA as a simple unity-gain. To maintain high CMR, it is impor- tant to have low source impedances driving the two inputs.
INA117 Datasheet PDF
To inna117 high CMR, it is impor. I tied pin 1 and pin 5 directly to the ground. Figures 2 and 3. The output voltage is equal to the differential input volt- age between pins 2 and 3. Differential amplifier s come in handy in applications where common-mode noise and interference are present in the system.
The output voltage is equal to the differential input volt.
The common mode input. A more complete transfer function. Reflow soldering is pretty much the only option for handling this kind of chips. V 5 and V 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 dagasheet back resistor, R 2and the IC substrate.
And because of the high CMMR they are well suited in high-side current measurement applications and in iha117 where voltages must be measured deferentially. Figure 1 shows the basic connections required for operation. In the video below, I showed how to use an SMD stencil to do reflow soldering using a hotair gun. Here is the PCB I designed for this differential amplifier. Applications with noisy or high impedance power supply lines. Some applications, however, apply voltages to the reference terminals pins 1 and 5.
According to datasheet, the typical offset voltage without any adjustment is only at around 0.