Post Go back to editing

hii there, am using ad5263 digipot and after the programming i can't measure the resistance (both end to end and Raw / Rwb) through DMM. In other words it (DMM) shows some erroneous value which is continuously changing. Why that happens??

if it is because of some internal circuitry, is it affect affect my signal??. because my signal is highly current and voltage sensitive. 

thank you in advance. . . . 

Parents
  • Hi Karalan,

    We need more details regarding your setup for us to better understand the issue you are encountering.

    Can you provide the following information regarding your setup:

    • schematic of your connections to the AD5263 (supplies, meters etc.)
    • a scope shot of your programming sequence
    • a scope shot of your power-up sequence (VDD, VSS, VL, & voltage across the potentiometer if there is one) 
    • actual resistance measurements on the potentiometer

    Kindly also check the /SHDN is in logic high and the SD bit in the write mode instruction byte is "0" if you are using I2C. When the DACs are in shutdown mode, terminal A is open circuited and wiper W is connected to terminal B. This would cause your resistance value to constantly change since you are measuring an open circuit.

    Best regards,

    Rainier

Reply
  • Hi Karalan,

    We need more details regarding your setup for us to better understand the issue you are encountering.

    Can you provide the following information regarding your setup:

    • schematic of your connections to the AD5263 (supplies, meters etc.)
    • a scope shot of your programming sequence
    • a scope shot of your power-up sequence (VDD, VSS, VL, & voltage across the potentiometer if there is one) 
    • actual resistance measurements on the potentiometer

    Kindly also check the /SHDN is in logic high and the SD bit in the write mode instruction byte is "0" if you are using I2C. When the DACs are in shutdown mode, terminal A is open circuited and wiper W is connected to terminal B. This would cause your resistance value to constantly change since you are measuring an open circuit.

    Best regards,

    Rainier

Children
No Data