AD8591_Single-supply operation and shutdown fuction.

Hi Team.

We have any questions about AD8591.

1. We want to use that V+ : 0V, V- : -5V. Is it possible that?

2. We will not use the Shutdown fuction. How do we handle this Pin?

thanks,

best regards,

Josh

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  • Hi Josh,

    1. Can I know what application are you using AD8591 and why you want to use V+ : 0V, V- : -5V?

    It is possible to use the supplies that you mentioned as long as the difference between the V+ and V- is from 2.5V to 6V.

    2. AD8591 is a CMOS amplifier, the input for the Shutdown function is a CMOS input and it cannot be left floating.

    In the simplified schematic on page11, the Shutdown inverter is connected to the input of PMOS which turns ON for a LOW input.This means that to get a LOW input at the gate of the PMOS, the Shutdown input should be HIGH.

    Therefore, it is best to tie LOW the Shutdown pin preferably w/ a resistor 10k to 1 Meg to ground when Shutdown is not used.

    Arthur

Reply
  • Hi Josh,

    1. Can I know what application are you using AD8591 and why you want to use V+ : 0V, V- : -5V?

    It is possible to use the supplies that you mentioned as long as the difference between the V+ and V- is from 2.5V to 6V.

    2. AD8591 is a CMOS amplifier, the input for the Shutdown function is a CMOS input and it cannot be left floating.

    In the simplified schematic on page11, the Shutdown inverter is connected to the input of PMOS which turns ON for a LOW input.This means that to get a LOW input at the gate of the PMOS, the Shutdown input should be HIGH.

    Therefore, it is best to tie LOW the Shutdown pin preferably w/ a resistor 10k to 1 Meg to ground when Shutdown is not used.

    Arthur

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