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—.
INA datasheet, Pinout ,application circuits High Common-Mode Voltage Difference Amplifier
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. Applications with noisy or high inq117 power supply lines. Figures 2 and 3. Leave a Reply Click here to cancel reply.
The supply voltage to the LT is very flexible and can be powered between 2. So to keep things simple.
This is based on the availability of the components I have on hand. Some applications, however, apply voltages to the reference terminals pins 1 and 5. I tied pin 1 and pin 5 directly to the ground. Internal circuitry connected to the compensation pin 8 can- cels the parasitic distributed capacitance between the feed- back resistor, R 2and the IC substrate.
Kerry D. Wong » Blog Archive » A Differential Amplifier Based on INA
A more complete transfer function. The transfer function is: The common mode input. One thing worth noting is that the CMRR specified in the datasheet assumes using a low impedance source datasheet for more information. Internal circuitry connected to the compensation pin 8 can. Figures 2 and 3 show optional circuits that may be used for trimming offset voltage and common-mode rejection.
Mail will not be published required. To maintain high CMR, it is impor. Most applications do not require trimming. The output voltage is equal to the differential input volt. Notify me when new comments are added. Resistance in series with the reference pins will also degrade CMR. Applications with noisy or high impedance power supply lines may dagasheet decoupling capacitors close to the device pins. Most applications use the INA as a simple unity-gain. Reflow soldering dataseet pretty much the only option for handling this kind of chips.
Differential amplifier s come in handy in applications where common-mode catasheet and interference are present in the system.
High Common-Mode Voltage Difference Amplifier
V 3 and V 2 are the voltages at pins 3 and 2. For specified dy- namic performance, pin 8 should be grounded or connected through a 0. Original theme by srinig. Basic Power and Signal Connections. Here is the PCB I designed for this differential amplifier. The schematic of this differential amplifier is shown below. 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. A more complete transfer function is: V 5 and V 1 are the voltages at pins 5 and 1.
The common mode input voltage is rejected. So the entire circuit can be conveniently powered by two alkaline batteries or a single lithium cell. Note that I substituted the resistor footprints with multiple paralleled resistors and used both through-hole and SMD footprints. According to datasheet, the typical offset voltage without any adjustment is only at around 0.
In the video below, I showed how to use an SMD stencil to do reflow soldering using a hotair gun. 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. Figure 1 shows the basic connections required for operation. The output voltage is equal to the differential input volt- age between pins 2 and 3.
Resistance in series with the reference pins will also degrade.