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INA121: schematic check

GARETH OU
Mastermind 9325 points
Part Number: INA121
Other Parts Discussed in Thread: PGA2500, PGA2505

Hi 

Could you help the check INA121 schematic and any need to adjust 

am8mp01.pdf

  • 0
    TI__Mastermind 20060 points

    Hi Gareth, 

    Is the goal to design a programmable gain using the DS1882? My concern is that there is potential for stability issues. I attempted to simulate this but do not see any ringing on the output. Typically we recommend the gain set resistor to be as close to the RG pins as possible to minimize any capacitance hanging off of the RG pins. The Rg pins are very sensitive and special care is needed in layout to get the gain resistor as close to the pins as possible. 

    I would recommend using a device that is designed specifically for programmable gains such as the PGA2500 or PGA2505. 

    https://www.ti.com/product/PGA2500

    https://www.ti.com/product/PGA2505

    I noticed the + and - were flipped as shown below. 

    Best Regards, 

    Chris Featherstone