SLASF62 June 2024 DAC80516
ADVANCE INFORMATION
Refer to the PDF data sheet for device specific package drawings
While the DAC80516 is designed for single-supply operation, Figure 8-1 shows that a bipolar output is also possible.
The circuit in Figure 8-1 gives a bipolar output voltage at VOUTPUT which is calculated as follows (at gain = 1):
where
The bipolar output span can be calculated through Equation 2 by defining a few parameters, the first being the value for the reference voltage. After a reference voltage is chosen, the gain resistors can be set accordingly by determining the desired VOUTPUT at code 0 and code 65536. For a VREF of 2.5V, gain of 1, and a desired output voltage range of ±10V, the calculation is as follows.
CODE = 0:
Setting the equation to minimum output span, VOUTPUT(0) = –10V, reduces the equation to: R3 / R1 = 4.
CODE = 65536:
Setting the equation to maximum output scan, VOUTPUT(65536) = 10V, and R3 / R1 = 4 reduces the equation to: R3 / R2 = 3
The maximum code of a 16-bit DAC is 65535; code 65536 is used to simplify Equation 3. For practical use, the true output span uses a range of –10V to (10V – 1LSB); in this case, –10V to +9.9996V.