LTC1658 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC1658' PDF : 12 Pages View PDF
LTC1658
APPLICATIONS INFORMATION
Rail-to-Rail Output Considerations
In any rail-to-rail DAC, the output swing is limited to
voltages within the supply range.
If the DAC offset is negative, the output for the lowest
codes limits at 0V as shown in Figure 1b.
Similarly, limiting can occur near full scale when the REF
pin is tied to VCC. If VREF = VCC and the DAC full-scale error
(FSE) is positive, the output for the highest codes limits at
VCC as shown in Figure 1c. No full-scale limiting can occur
if VREF is less than VCC – FSE.
Offset and linearity are defined and tested over the region
of the DAC transfer function where no output limiting can
occur.
OUTPUT
VOLTAGE
VREF = VCC
VREF = VCC
INPUT CODE
(c)
POSITIVE
FSE
OUTPUT
VOLTAGE
OUTPUT
VOLTAGE
0
8192
16383
INPUT CODE
(a)
0V
NEGATIVE
OFFSET
INPUT CODE
(b)
1658 F01
Figure 1. Effects of Rail-to-Rail Operation On a DAC Transfer Curve. (a) Overall Transfer Function (b) Effect of Negative
Offset for Codes Near Zero Scale (c) Effect of Positive Full-Scale Error for Input Codes Near Full Scale When VREF = VCC
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