I am working with LTC2662 IDAC's. I send the negative reference span code and then do update power on but I don't see the negative reference at output pin.
here is the detail:
1. for DAC3, I send a span command of 0x6 and with code of 0x8 (for -ve V) and dac address 0x3
so the command looks like below:
2. Now I send a update command with (update n)
3. when I probe at output pin 19 using voltmeter, I don't see -ve voltage but 0.632V
Can someone please help me understand what am I missing in this case.