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Unexpected current to VREF+ pin

I am using ADuC7060 to measure temperature in configuration describer in AN-0970.

  • Rref is 5.07 kOhm.
  • Excitation current is 200 uA.
  • RTD is 1 kOhm platinum resistor.

Measurement contains error about 3°C (higher than real temperature).

I recognized source of error. It is unexpected 3uA source current to VREF+ pin.

Is there something wrong with the chip?

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