Other Parts Discussed in Thread: DAC61402, MSP-EXP432E401Y
Hi Expert,
Good day.
Client have the LDAC pin on the eval board connected to their IOVDD power supply, which supplied with 3.3 V. After current limiting with power supply, found that this IOVDD was not able to get past ~0.6 V without drawing too much current. Determined that it was the LDAC pin, as when they disconnected the LDAC from IOVDD, IOVDD was able to get the full voltage without drawing near the amount of current. Had current limited the power supply for 30mA.
The same issue happened when powered LDAC with 3.3 V from my SPI device.
They're thinking that it was supposed to connect the LDAC pin to IOVDD, as page 4 of the DAC61402 data sheet says "Connect to IOVDD if unused." However, page 9 of the DAC61402EVM User Guide says the default position of LDAC Pulldown is low.
Client is wondering if it's okay to leave LDAC unconnected, connect LDAC to IOVDD through a resistor, or how should they support to connect the LDAC jumper pin for my application?
They're not using the Launchpad or MSP-EXP432E401Y for their application, instead hoping to read in data from a separate SPI device. The separate SPI device cannot control LDAC. Also, they reported not currently have an external reference voltage connected to the eval board.
Thank you.
Regards,
Archie A.
