Hi,
Our costomer have evaluated DAC38J84EVM/revision-D.
The results were different from work out on paper.
◆work out on paper
coarse_dac=10[dec],V_EXTIO=0.9[V],R_BIAS=1.91[kΩ]
The data sheet says that IOUT_FS = (coarse_dac + 1) x V_EXTIO/R_BIAS x 4.
Then, IOUT_FS equals 20.73mA. and if load resistance is 50Ω just like DAC38J84EVM, the voltage of IOUTAP and IOUTAN pins shoud be 0.52V.
◆evaluation result
The voltage of IOUTAP and IOUTAN pins were 0.66V. Also EXTIO pin was 0.901V.
I believe that the value of IOUT_FS might be shifted compared with work out on paper.
Is there something that is considered to be the cause of that?
Best Regards,
Kato