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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Some applications, however, apply voltages to the reference terminals pins 1 and 5. Note that I substituted the resistor footprints with multiple paralleled ddatasheet 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. Figure 1 shows the basic connections required for operation.
INA117 Datasheet PDF
The transfer function is: According to datasheet, the typical offset voltage without any adjustment is only at around 0. Mail will not be published required.
A more complete transfer datashet is: V 3 and V 2 are the ina1117 at pins 3 and 2. So the entire circuit can be conveniently powered by two alkaline batteries or a single lithium cell. Here is the PCB I designed for this differential amplifier. In the video below, I showed how to use an SMD stencil to do reflow soldering using a hotair gun.
Leave a Reply Click here to cancel reply. So to keep things simple. Home My Youtube Channel About. Most applications do not require trimming. 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 datawheet applications I have in mind.
Kerry D. Wong » Blog Archive » A Differential Amplifier Based on INA
This is based on the availability of the components I have on hand. Notify me when new comments are added. Offset adjustment is regulated—. For specified dy- namic performance, pin 8 should be grounded or connected through a 0. Applications with noisy or high impedance power supply lines may require decoupling capacitors close to the device pins. The supply voltage to the LT is very flexible and can be powered between 2.
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. I tied pin 1 and pin 5 directly to the ground.
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. Figures 2 and 3. Some applications, however, apply voltages to the reference.
The schematic of this differential amplifier is shown below. Basic Power and Signal Connections. To maintain high CMR, it is impor. Reflow soldering is pretty much the only option for handling this kind of chips. A more complete transfer function. Since this design was meant to serve as a building block una117 other circuits, no impedance matching resistors are incorporated on the input side and no additional signal amplification is provided.
Resistance datasbeet series with the reference pins will also degrade.
Internal circuitry connected to the compensation pin 8 can. Resistance in series with the reference pins will also degrade CMR.