ADAS3022 Recommended Circuit Help

Question

I see in the Recommended circuit schematic for the ADAS3022 ADC that the ADR434 is to be used for providing the 4.096 V reference voltage. When I considered the ADR434 datasheet, I see that it is meant to operate at a voltage from 6V-18V. The Recommended circuit for the ADAS3022 designates that a 5V input should be given to the ADR434. Is this correct? If not, how can the circuit be adjusted to consider this? Any assistance would be appreciated.

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Gnib · Answer

Hi codigwe, 
 True ADR434 operate to a range of 6.1V to 18V. However the evaluation board ADR434 used Vin= +15V. Please see attached picture,seems we need to update figure53 of the datasheet to avoid this confusion. Thanks for catching this.For more information you can check the whole schematic in the user guide UG484 . 
 
 regards, 
 LLoben

Gnib · Answer

Hi codigwe, 
 Seems you follow the recommended setting for the reference circuit.It should be able to power the ADR435 with a +15V supply. . Aside from ADAS3022 and ADR435 what other components connected to this? it draw current if the total impedance excess than expected. I should check first the power supply circuit.Try to limit the connection on this. Please take note ADP1612/13 as per datasheet page3 Vout=12V ILoad is limited to 10mA to 150mA. 
 regards, 
 LLoben

Gnib · Answer

Hi codigwe, 
 I'm glad to hear that it works.Yes circuit still works. ADAS3022 allows the choice of an internal reference. Please take note in using decoupling capacitor as shown in datasheet figure62 to reduce the noise on the output. 
 regards, 
 Lloben

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ADAS3022 Recommended Circuit Help