Supply current required(approximate values of Idd1 and Idd2) for ADUM242E when there is no input and Vdd1 and Vdd2 are 3.3 V

Want to understand how much supply current (Idd1 and Idd2) will be required for ADUM 242E when there is no input and a switching input if Vdd1 and Vdd2 both are 3.3 Volts .

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  • +1
    •  Analog Employees 
    on Sep 21, 2020 3:35 PM

    Hi,

    The ADuM242E is an On-Off Keying (OOK) architecture. It transmits a signal across the barrier in its non-default state. It more or less sits idle in the default state. See the figure 19 and Figure 20 in the ADuM242E datasheet. 

    If we look at the ADuM242E0, which is default low, it would be advantageous from a power savings perspective to keep idle inputs low. With inputs high, the transmitter would run continuously and consume more power. Refer to the Quiescent Supply Current specifications in Table 3 of the ADuM242E datasheet for full details on supply requirements at 3.3V.

    For switching specifications, there is  guidance in Table 4 and the Typical Performance Curves, Figure 15 and Figure 16. But the current consumption on the output side is going to depend on the PCB layout and characteristics as well. Each output signal’s trace capacitance will add c*v*f worth of current to the output side’s supply need. 

    Regards,
    Jason

Reply
  • +1
    •  Analog Employees 
    on Sep 21, 2020 3:35 PM

    Hi,

    The ADuM242E is an On-Off Keying (OOK) architecture. It transmits a signal across the barrier in its non-default state. It more or less sits idle in the default state. See the figure 19 and Figure 20 in the ADuM242E datasheet. 

    If we look at the ADuM242E0, which is default low, it would be advantageous from a power savings perspective to keep idle inputs low. With inputs high, the transmitter would run continuously and consume more power. Refer to the Quiescent Supply Current specifications in Table 3 of the ADuM242E datasheet for full details on supply requirements at 3.3V.

    For switching specifications, there is  guidance in Table 4 and the Typical Performance Curves, Figure 15 and Figure 16. But the current consumption on the output side is going to depend on the PCB layout and characteristics as well. Each output signal’s trace capacitance will add c*v*f worth of current to the output side’s supply need. 

    Regards,
    Jason

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