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AD7124-4 Power in standby mode

Question asked by steveD1234 on Jul 10, 2017
Latest reply on Jul 24, 2017 by JellenieR

Hi,

I'm using the AD7124-4 for an application that requires low power between measurements, so I am using the ADC's standby mode in combination with single conversion mode.  The current in Standby mode, however, is much higher then anticipated.

 

As I understand the datasheet, typical power-down current should be 2 uA and typical standby current should be 15 + 22 (internal oscillator) = 37uA.  Is this correct?  There are no other peripherals enabled (reference, digital outputs, bias voltage generator, or power switch).

 

From power-down to standby my adc is showing an increase of ~240 uA, much more than the expected 35uA.  Any advice as to why that extra power is being used and how to reduce it would be much appreciated.  Attached are the register values as read off the adc, and a partial circuit schematic.

 

Let me know if there's anything I can clarify and thanks for any help,

 

Steve

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