I am trying to use the circuit mentioned in the datasheet page 4 figure 4. But instead of using the op amp mentioned, I am using a lm324 to avoid using +-15v rails. I have triple checked the connections, but as soon as I turn on my circuit the chip heats up. I tried it with two different chips but every time the chip heats up as soon as I turn on the circuit. What may be the problem?

Edit Would keeping the BIT values as floating cause this? Because right now they are not connected to anything.

  • 2
    \$\begingroup\$ Can you upload a picture of what you're doing? How hot does the chip get? Can you copy the circuit diagram from the datasheet into the question? \$\endgroup\$
    – jippie
    Mar 20, 2013 at 9:13
  • \$\begingroup\$ Sorry, I cannot right now. \$\endgroup\$
    – Rick_2047
    Mar 20, 2013 at 9:25
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    \$\begingroup\$ Are you aware that with a positive voltage reference on the DAC and with the op-amp circuit you are using, you will need a negative supply rail? Which chip gets hot - the DAC or the LM324? \$\endgroup\$
    – Andy aka
    Mar 20, 2013 at 9:32
  • \$\begingroup\$ The DAC gets pretty hot \$\endgroup\$
    – Rick_2047
    Mar 20, 2013 at 9:53
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    \$\begingroup\$ Leaving the bit values floating is certainly not reccomended; at least ground all of them. \$\endgroup\$
    – pjc50
    Mar 20, 2013 at 16:31

1 Answer 1


For future reference, this happens due to floating bit values. Do not keep the bit values floating.


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