REF01 Internal trim adjustment circuit

Hi,

Please give me the resistance values of R5, R6, R20, and VBG Voltage of Figure 33. I would like to calculate the calibration range of trim adjustment circuit which has some difference with figure 35.

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  • Hi Jiro,

    As stated in REF01 data-sheet "Newer designs should use ADR01". ADR01 offer high accuracy and temperature stability over wider operating range and maintains full pin to pin compatibility with the REF01. After analyzing the schematic R5 = 35k, R6~ 4.137k and R20= 20k. Please note for finer VOUT adjustment please add a series 470k resistor connecting trim pin. The core band gap voltage VBG = 1.057 V. 

    Please let me know if you have any additional questions.

    Regards,

    Anshul

Reply
  • Hi Jiro,

    As stated in REF01 data-sheet "Newer designs should use ADR01". ADR01 offer high accuracy and temperature stability over wider operating range and maintains full pin to pin compatibility with the REF01. After analyzing the schematic R5 = 35k, R6~ 4.137k and R20= 20k. Please note for finer VOUT adjustment please add a series 470k resistor connecting trim pin. The core band gap voltage VBG = 1.057 V. 

    Please let me know if you have any additional questions.

    Regards,

    Anshul

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