ADG5436_unbalance power supply

Q 

Can I  use SPDT switches to generate a -40V to 0V logic signal. So he needs a
unbalanced power supplies. For example Vss=-40V, Vcc=7V. However, I think it
will exceeds the power supply range of ADG5436. I am not quite sure whether
ADG5436 or any other part can support that application.
I asked the customer to do some test on it.

 

A 

The absolute maximum ratings of this device is 48V for Vdd to Vss. This is a
stress rating only and is not recommended for normal operation.
The max recommended operational voltage is approx 40V (36V+10%) This is what we
guarantee in the specification tables.

In the features section on the front page we state the part operation is:
+/-9V to +/-22V dual supply
+9V to 40V single supply

We have Ron plots at Vdd = 9V and it is around this point where the internal
Vcc generator will switch off.

The only way you can reliably do this is to shift everything down:
Vdd = 0V, Vss = -40V, Gnd = -10V
Logic must be referenced to gnd so should go from -10v to -5V
Comments
Anonymous
  • over 3 years ago

    I'm using the ADG5436 with the following setup:

    Vdd = +25V

    Vss = -10V

    GND = 0V

    digital inputs = 0V / 3,3V

    Signal input -8V..20V

    Is this asymmetric supply allowed? In the data sheet i can find only symmetric supply (+/-10V, +/-20V, ...) or single supply (+20V, +30V, ...) but no statement is saying that asymmetric power supplies within the recommend voltage range is allowed or forbidden.

    Can anyone give me an answer?

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