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I would like to know the equivalent resistance of the (Vcc~ADJ1) internal circuit of LTC2909ITS8-5

Category: Hardware
Product Number: LTC2909ITS8-5, LTC2909

I would like to know the equivalent resistance of the (Vcc~ADJ1) internal circuit of LTC2909ITS8-5.

R9 assembly resistance value: 732 Kohm

Multi Meter Resistance Meter Measured Value: 78 Kohm

Q1: I would like to know the calculated resistance value measured in R9 - 78 Kohm.

I would be even more grateful if you could calculate it.

R12 assembly resistance value: 75 Kohm

Multi Meter Resistance Meter Measurement Value: 68 Kohm

Q2: I would like to know why R12 is measured at 68 Kohm and the internal equivalent circuit.

I would be even more grateful if you could calculate it.

  • Hello,

    The ADJ pins are very high impedance, with a max leakage of +/-15nA over temperature at 0.55V bias.  If your resistor values are 1Meg-ohm or less, you should have no concerns about Thevenin impedance.  For your other two questions, I am not quite sure what you are asking.  It sounds like the wrong resistor values were populated.

    Best regards,

    Brad