ADR5045 Voltage bias for a voltage divider

Hi

I would like to measure the voltage with a voltage divider.

I would like to bias (offset, subtract) 5V with the ADR5045BKSZ-REEL7  from a 6-16V Voltage Source.

My current scheme is this:

I have calcuted that the Total current should be betwwen 75uA (6V Input) and  820uA (16v) Input. Max Voltage Output is about 3.5V, Minimum about 0.3V. (Spannungsteiler, belastet)

I have seen on another post that somebody made a similar circuit with a TL431 variable shunt regulator:

Do you agree that my solution should working?

Thank's very much for every input

Andy

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  • Yes, it should be working the same except the TL431 design will have additional current thorugh that 5V/50Kohm.

    The voltage drop across the ADR5045 will not suffer from accuracy error of the 50Kohm resistor.

    Another option is to use a negative linear regulator such as the ADP7182 set for -5V out. In this case the voltage will always be 5V below Vcc independently of how much current is flowing to Vss. On the ADP7182 you would have 0Vin connected to your GND and GND pin connected to your Vcc

    I see you listed the Vss as being a DAC with 0-3V. Is this a DAC you are powering or a DAC you want to use to control the voltage at Vss?

    Best Regards,

    LucaV

Reply
  • Yes, it should be working the same except the TL431 design will have additional current thorugh that 5V/50Kohm.

    The voltage drop across the ADR5045 will not suffer from accuracy error of the 50Kohm resistor.

    Another option is to use a negative linear regulator such as the ADP7182 set for -5V out. In this case the voltage will always be 5V below Vcc independently of how much current is flowing to Vss. On the ADP7182 you would have 0Vin connected to your GND and GND pin connected to your Vcc

    I see you listed the Vss as being a DAC with 0-3V. Is this a DAC you are powering or a DAC you want to use to control the voltage at Vss?

    Best Regards,

    LucaV

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