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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Note that I substituted the resistor footprints with multiple paralleled resistors and used both through-hole and SMD footprints.
The transfer function is: The output voltage is equal to the differential input volt- age between pins 2 and 3. A more complete transfer function is: And because of the high CMMR they are well suited in high-side vatasheet measurement applications and in situations where voltages must be measured deferentially.
Resistance in series with the reference pins will also degrade. Offset adjustment is regulated—. Figures 2 and 3.
Some applications, however, apply voltages to the reference. Reflow soldering is datasehet much the only option for handling this kind of chips. Here is the PCB I designed for this differential amplifier. Home My Youtube Channel About.
Most applications do not require trimming. So the entire circuit can be conveniently powered by two alkaline batteries or a single lithium cell. Resistance in series with the reference pins will also degrade CMR.
Internal circuitry connected to the compensation pin 8 can. Basic Power and Signal Connections. Offset Voltage Trim Circuits. Differential amplifier s come in handy in applications where common-mode noise and interference are present in the system. The schematic of this differential amplifier is shown below. Most applications use the INA as a simple unity-gain. Applications with noisy or darasheet impedance power supply lines may require decoupling capacitors close to the device pins.
Some applications, however, apply voltages to the reference terminals pins 1 and 5. In the video below, I showed how to datasueet an SMD stencil to do datzsheet soldering using a hotair gun. This is largely attributed to the very in1a17 common-mode rejection ratio CMRR these amplifiers provide.
So to keep things simple. This is based on the availability of the components I have on hand. Leave a Reply Click here to cancel reply.
High Common-Mode Voltage Difference Amplifier
Figures 2 and 3 show optional circuits that may be used for trimming offset voltage and common-mode rejection. Notify me when new comments are added.
Internal circuitry connected to the compensation pin 8 can- cels the parasitic distributed capacitance between the feed- back resistor, R 2and inna117 IC substrate. For specified dy- namic performance, pin 8 should be grounded or connected through a 0.
INA117 Datasheet PDF
V 3 and V 2 are the voltages at pins 3 and 2. A more complete transfer function. Figure 1 shows the basic connections required for operation. To maintain high CMR, it is impor. Mail will not be published required. One thing worth noting is that the CMRR specified in the datasheet assumes using a low impedance source datasheet for more information.
The output voltage is equal to the differential input volt. 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.
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To maintain high CMR, it is impor- tant to have low source impedances driving the two inputs. V 5 and V 1 are the voltages at pins 5 and 1. Original theme by srinig.
Applications with noisy or high impedance power supply lines. The common mode input voltage is rejected. I tied pin 1 and pin 5 directly to the ground. The supply voltage to the LT is very flexible and can be powered between 2.