Tool/software:
The drift specs take up several lines on the data sheet, and I don't understand how the terms are used to specify what the output voltage drift might be. screenshot below:
PARAMETER | Conditions | DAC1220E | |||
min | typ | max | unit | ||
ACCURACY | |||||
Monotonicity | 16 | bits | |||
Monotonicity | 20 bit mode | 20 | bits | ||
Linearity error | ±15(1) | ppm of FSR | |||
Unipolar offset error and gain error(2) | ±60 | ppm of FSR | |||
Unipolar offset error drift(3) | 1 | ppm/°C | |||
Bipolar zero offset error(2) | VOUT = VREF | ±15 | ppm of FSR | ||
Bipolar zero offset drift(3) | 1 | ppm/°C | |||
Gain error(2) | ±150 | ppm of FSR | |||
Gain error drift(3) 2 | 2 | ppm/°C |
We are using this DAC in 20 bit mode and it is a drift sensitive application.
1. My first question is do the drift specs apply in 20-bit mode, even though they are only stated in 16-bit mode?
2. If not, what are the drift specs in 20-bit mode?
3. How are the unipolar offset error drift, bipolar offset drift, and gain error drift meant to be used together to calculate total output drift?