Hi team,
My customer is evaluating PA control circuit with AMC7834 and they would like to consult with you.
They would like to have one port DAC for -3.4v use only. Would you recommended for this requirement?
May I know the full range and LSB of DAC voltage as below table? Thanks.
Hello Feng
To set -3.4V output on a DAC, you may use either one of the following configurations
1. Set bit 2 of the DAC Range register shown below to 1, which enables -5 to 0V range on bipolar DAC's 1 and 2 (if you intend to use DACs 3 and/or 4, set bit 0 to 1) . With your range set at -5 to -0V, code 0x000 sets -5V on the specified DAC, with code 0xFFF (4095) representing 0V. In this case, your LSB is 5/4096 V or 1.22mV (i.e each bit increment in your code increases DAC voltage by 1.22 mV) so to set -3.4V, the code 0x51F (or 0101 0001 1111) should be written to the desired DAC register
2. Do not set any of the DAC Range register bits to 1, which enables -4 to 1V range on all bipolar DAC's. With your range set at -4 to 1V, code 0x000 sets -4V on the specified DAC. In this case, your LSB is still 1.22mV (voltage range of 5V represented by 12 bits) so to set -3.4V, the code 0x1EB (or 0001 1110 1011) should be written to the desired DAC register
Hope this helps!
Anshuman
