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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Basic Power and Signal Connections. For specified dy- namic performance, pin 8 should be grounded or connected through a 0. I tied pin 1 and pin 5 directly to the ground. Home My Youtube Channel About. Internal circuitry connected to the compensation pin 8 can- cels the parasitic distributed capacitance between the feed- back resistor, R 2and the IC substrate.
The schematic of this differential amplifier is shown below. A more jna117 transfer function is: Figure 1 shows the basic connections required for operation. Some inx117, however, apply voltages to the reference. Figures 2 and 3 show optional dataasheet that may be used for trimming offset voltage and common-mode rejection. Resistance in series with the reference pins will also degrade. So to keep things simple. The common mode input.
High Common-Mode Voltage Difference Amplifier
Original theme by srinig. The output voltage is equal to the differential input volt- age between pins 2 and 3.
Leave a Reply Click here to cancel reply. 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. Note that I substituted the resistor footprints with multiple paralleled resistors and used both through-hole and SMD footprints.
Mail will not be ija117 required. Notify me when new comments are added. The output voltage is equal to the differential input datasneet.
INA Datasheet(PDF) – Burr-Brown (TI)
Applications with noisy or high impedance power supply lines may require decoupling capacitors close to the device pins. Since xatasheet 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.
V 5 and V 1 are the voltages at pins 5 and 1. Applications with noisy or high impedance power supply lines. A more complete transfer function.
Resistance in series with the reference pins will also degrade CMR. V 3 and V 2 are the voltages at pins 3 and 2. To maintain high CMR, it is impor- tant to have low source impedances driving the two inputs. 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. So the entire circuit can be conveniently powered by two alkaline batteries or a single lithium cell.
This is largely attributed to the very high common-mode rejection ratio CMRR these amplifiers provide. The transfer function is: Here is the PCB I designed for this differential amplifier.
Offset Voltage Trim Circuits. The supply voltage to the LT is very flexible and can be powered between 2. Most applications use the INA as a simple unity-gain. Offset adjustment is regulated—. According to datasheet, the typical offset voltage without any adjustment is only at around 0. Reflow soldering is pretty much the only option for handling this kind of chips. Differential amplifier s come in handy in applications where common-mode noise and interference are present in the system.
The common mode input voltage is rejected. Internal circuitry connected to the compensation pin 8 can. To maintain high CMR, it is impor. Most applications do not require trimming. In the video below, I showed how to use an SMD stencil to do reflow soldering using a hotair gun. 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.
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.