11-30-2022, 09:04 AM
1. you can check your PCB 3.3v Vcc pin whether is well. whether it's 3.3v value.
now R37,R38,R47,R49 all are 10K resistance.
if use 20K resistance , MAX DAC voltage should be: 3.3v * (1 + 20K/10K) = 9.9V
2. if Vcc is 3.3v work well , you can try to replace 20K resistance to 22K for a test. it should be output MAX 10.05V
now R37,R38,R47,R49 all are 10K resistance.
if use 20K resistance , MAX DAC voltage should be: 3.3v * (1 + 20K/10K) = 9.9V
2. if Vcc is 3.3v work well , you can try to replace 20K resistance to 22K for a test. it should be output MAX 10.05V