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 Mail will not be published required.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