Reference output voltage on AD669 too low

I have a board with AD669 (PDIP package), powered by an external power supply and three voltage regulators (+15V, -15V, +5V), working in the bipolar configuration (wired up as recommended on the page 16 of the AD669BNZ datasheet, with 50Ohm resistors connecting the REF OUT, REF IN and BIP OFFSET).

 

Even though the V_EE, V_CC and V_LL are all on correct levels (-15V, +15V and +5V respectively), and the DAC is not puling more than 12mA of current, REF OUT (on pin 28) outputs -4.65V, instead of the documented +10V. What could be the reasons for this happening? Is the DAC working, but is not wired properly? Or has it been broken?

 

Many thanks.

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    •  Analog Employees 
    on Aug 2, 2018 2:51 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    EZ Admin
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  • 0
    •  Analog Employees 
    on Aug 2, 2018 2:51 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    EZ Admin
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