Mounting Type, Surface Mount. Package / Case, 8-TSSOP, 8-MSOP (“, mm Width). Supplier Device Package, 8-VSSOP. Base Part Number, INA Texas Instruments INA Series Instrumentation Amplifiers are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for Texas. Texas Instruments INA Instrumentation Amplifiers are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for Texas Instruments .
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Nov 5, 1: Nov 3, I think it will explain your “problem”. In the data sheet it is not mentioned that the gain changes with the load current. Inz321 newly created question will be automatically linked to this question. Ina3211 it is imperative that you connect both inputs to a known voltage within the common-mode range, such as 1V, as shown ima321 In reply to Neil Albaugh: The differential voltage will be 0V and the output should assume the voltage at the reference pin mV.
Hello Matas, By shorting both inputs to 0V, the input common-mode range of the INA is violated and the output is not valid.
Reference Voltage plot given on page 6 of the data sheet. In reply to MSPBeginner: TI, its suppliers and providers of content reserve the right to make corrections, deletions, modifications, ona321, improvements and other changes to the content and materials, its products, programs and services at any time or to move or discontinue any content, products, programs, or services without notice.
And the input offset in the data sheet is given to be max 1mV.
If the voltage on the input is 0mV the output should be the same as reference mVbut unfortunately I get 0mV. Use of the information on this site may require a license from a third party, or a license from TI. In reply to MSPBeginner:. TI is a global semiconductor inaa321 and manufacturing company.
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INA Datasheet(PDF) – Texas Instruments
Do you think the input offset gets amplified? If you are still not getting the right output voltage after shorting the inputs to 1V, try disconnecting the output from the rest of the circuit. We are glad that iha321 were able to resolve this issue, and will now proceed to close this thread.
Hardware — The frontend’s INA inamp | Details |
The plot shows that the gain gets stable at the end, but this is not really true, because for ex for uA, the gain is 92,22 and for 50uA it is 88, All content and materials on this site are provided “as is”. If you have further questions related to this thread, ina32 may click “Ask a related question” below. Ina32 Albaugh Have you considered the error due to the input offset voltage and common-more rejection. Jul 30, How could you explain this?
INA321 gain error
Use of the information on this site may require a license from a third party, or a license from TI. I got the following lna321 attached.
Sorry, I may have been not clear enough, the voltage on the reference pin is mV and on both input I give 2.
Also be sure to measure the input voltages and reference voltage at the pins of the device. Content on this site may contain or be subject to specific guidelines or limitations on use. If you have a related question, please click the ” Ask a related question ” button in the top right corner. Ask a related question Ask a new question.
The output is filtered by a simple RC high pass filter. Have you considered the error due to the input offset voltage iha321 common-more rejection?
Can the amplifier chew off that part of the reference? TI, its suppliers and providers of content reserve the right to make corrections, deletions, modifications, enhancements, improvements and other changes to the content and materials, its products, programs and services at any time or to move or discontinue any content, products, programs, or services without notice.
Does this change with common mode voltage? Jul 31, 8: While it also should output mV. I use LM as the offset trimmer. When I’m sweeping inq321 differential voltage at the input of the INA, the CM voltage is constant, sow why is the output offset not constant as you see in the charts above?
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