Analog Signal Range and Power Supply Voltage

Hello expert,

I have a question on ADG802 and all these SPST switch. In the datasheet, it says the Vs should be from 0 to Vdd V. Does it mean that the maximum voltage can be controlled by this switch is below Vdd which is around 5V?

Or I could apply any voltage but just need to make sure the current on the on-resistor in below the current limit which is 100 mA?

If it is the first case, could you please give me any suggestion on low support voltage with high switch voltage/current switch. I know there are some digital-input serializer(DIS) like TI SN65HVS883(SN65HVS883 34 V, Eight-Channel Digital-Input Serializer | TI.com ) which can be used for MCU control high voltage circuit. However, that is too big and I don't need 8 channel. Do you have similar product which is fitting for my requirement?

Thanks,

Jianlin

  • Hi Jianlin,

    I'm not sure on what you meant by "Does it mean that the maximum voltage can be controlled by this switch is below Vdd which is around 5V?". Please clarify.

    The ADG802 can accommodate analog input signal range of 0V to VDD. This means that the switch will let signal from 0V to VDD to pass through. For example, if VDD = 5.5V, then the input signal range to be applied at the S/D pins could be from 0 to 5.5V only. Analog signal range may not exceed the VDD supply as it could cause damage to the switch.

    For the input current to pass through the switch, please have a look at the Absolute Maximum Ratings Section of the ADG802 datasheet, page 5. It is stated that the Continuous Current to be applied at the S and D pins can be up to 400mA only. 

    Regarding your question "Or I could apply any voltage but just need to make sure the current on the on-resistor in below the current limit which is 100 mA?"

       - No, the ADG802 will let pass input signal  from 0V to VDD with current of up to 400mA only. Signals above these range will cause damage to the switch. 

    Regarding the digital serializer, the link below shows the serializer/deserializer portfolio available in ADI. You might want to choose which parameters you're focusing on and select the most suitable part.

    Selection Table for Serializers/De-Serializers & Selectors | Parametric Search | Analog Devices 

    Let me know if this helps.

    Best Regards,

    May