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AD5420 REFIN connected to REFOUT measures 1.782V.

Question asked by JPD on Apr 10, 2018
Latest reply on Apr 16, 2018 by rrosario

AD5420 connected similar to Figure55 in the datasheet (without C1 and AD5700)

DVCC connected external 5V

DVCC SELECT grounded.

RefOut measures 1.782V instead of the expected 5V.

What could be wrong?

 

Code Sequence:

 

Initialization:

CLEAR high pulse 5us

SPI 0x056 0x0001

Latch high pulse 100us

SPI 0x055 0x3006 (0 to 20mA range)

Latch high pulse 100us

 

Continuous loop:

SPI 0x01 16bit data

Latch high pulse 100us

 

Initialization scope shot attached.

 

Thanks,

Jayant

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