TPCE636 User Manual Issue 1.0.2
Page 21 of 104
The following table shows the data coding for VREF and VOFF output voltage range.
Description
Digital Code
+9.9997V
0xFFFF
+5.0V
0xC000
+2.5V
0xA000
0V
0x8000
-2.5V
0x6000
-5.0V
0x4000
-10.0V
0x0000
Table 5-4 : Voltage coding for the Reference DAC
The output voltage range is then calculated with these two reference values (VREF and VOFF) as follows:
Vrange_high = -1 * VOFF
Vrange_low
= -1 * VOFF - 2 * VREF
See the following Examples for:
VOFF
VREF
Vrange_low
Vrange_high
Voltage Range
Note
+10V
(0xFFFF)
-10V
(0x0000)
-10V
+10V
-10V … +10V
typical range
+5V
(0xC000)
-5V
(0x4000)
-5V
+5V
-5V … +5V
typical range
+1.25V
(0x2000)
-5V
(0x4000)
-1.25V
+8.75V
-1.25V … +8.75V
asymmetric
range
-5V
(0x4000)
+5V
(0xC000)
+5V
-5V
+5V … -5V
changes sign
Thus, any desired output voltages can be generated. But in any case it is important to ensure that the
voltages Vout1 and Vout2 are never set above +10V or below -10V. Voltages above these limits cannot be
generated and lead to incorrect outputs.