About DAC5578 Application Question

Kuo,

1. Reference Voltage can use divider resistor ?
   1. Yes. Since there are multiple channels and the input current for the VREFIN pin is so low it would appear to me there is a buffer internally which would allow you to use an external resistor divider for the reference voltage.
2. Does DAC OUTPUT need connect any R/C circuit  and any action if we don't use?
   1. The feedback networks for the output amplifiers are connected internally so there is no termination scheme required for un-used DAC channels.
3. What should we to do(pull high/ down) about pin /LDAC and /CLR?
   1. This is not required, but a pull-up on pins tied high is usually advisable in order to minimize any current consumption due to the logic high connection although input impedance for these digital pins is usually fairly high.
4. What's the function of TWOC? (the complement format and straight binary format.
   1. Not sure what the question is here. The pin selects the input data format for the DACs between binary twos complement and straight binary. If high the format is twos complement. If low the format is straight binary. Twos complement is the same format you would expect for a signed integer, for example, in C while straight binary is an unsigned integer.