Hi Team
When using DAC8775, config the register 0x04 range to voltage output ±12V，and then customer would observe a -12V voltage output. Is this -12V output a default output in this setting or?
Customer would wirte another code to set the output 0V after 1ms, so such -12V would be a spike in the output waveform. How could prevent such -12V come out?
Best Regards
Gene,
The output of the buck-boost converter does put out ±15V as default. However, these supply voltages are not enabled as default. Because of this, you can program the VPOS and VNEG voltages, and then only enable the VPOS voltage.
This is programmed in the Configuration Buck-Boost Register (0x07). The last two bits are PNSEL[1:0] bits that enable the buck-boost outputs. You can see them here:
In short, you program the buck-boost voltages from either PCLMP[3:0] and NCLMP[3:0]. Then you just enable the positive arm with PNSEL[1:0] = 01.
Joseph Wu
