Dear AD Support,
For my low power design I need to know the AD8336 power consumption when no signal is applied to the input of the component.
You can compute the power dissipation of your device when no signal is applied to the inputs by using the equation below:
For +/- 3V:PD = 6V x 30mA = 180mW
For +/- 5V:PD = 10V x 30mA = 300mW
For +/- 12V:PD = 24V x 31mA = 744mW
May I know if your PWRA is pulled high?If so, change the Isy to the specified values in the page 4 of the AD8336 datasheet.
Thank you for your reply. Under my 3V voltage, 30mA is a huge amount of current for a no signal condition.
I expected a quiescent current far lower, in the order of 100uA.
The PWRA is either high or low, I can decide freely.
With logic high the power is reduced to 18mA but it is not enough to match my low power target.
I might have to create a "low power mode" with external components.
I was wondering which VGAs you've found with 100uA Isy? Ours are on the high side (actually 30mA is low compared to some of the higher frequency parts. Part of the reason is that VGAs are still bipolar as they employ the exponential properties of bipolar transistors whereas low power is associated with CMOS processing. There are some simple op-amps in CMOS and even bipolar that are low power but the transistor count and operating frequencies of these low power requirement are less stringent.
Best of luck
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