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INA1620EVM: Using external resistors to set the amplifier gain in INA1620EVM User's Guide(SBOU205-March 2018)

Jason wang1989
Prodigy 60 points
Part Number: INA1620EVM

1. R15=R20 is Not matched...

2. If we connect the IN- to GND，and Set R1=R7=1K ohm，R2=R6=2Kohm：

when using Equation (4), ,VRightChannelOutput = (1k/(2k+1k))*(1+2k/1k) * IN+ = 1* IN+

But using Equation (6) ,VRightChannelOutput = (R2/R1) * IN+ =2 * IN+

So is there something wrong....

  • 0
    TI__Genius 13485 points

    Hi Jason,

    There are two typos in the clip shown above.  First, "R5" should read "R15".  

    Next, in equation 4, the first reference of R7 should be R6, so, Vrightchanneloutput = (R6/R6+R7)...  Now, when using R1=R7=1k, and R2=R6=2k, both equations will yield a gain of 2.

    Please let us know any further questions or concerns..

    Best Regards,

    Mike