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LTC1448 Datasheet(PDF) 7 Page - Linear Technology

Part # LTC1448
Description  Dual 12-Bit Rail-to-Rail Micropower DAC
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1448 Datasheet(HTML) 7 Page - Linear Technology

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LTC1448
APPLICATIONS INFORMATION
1448 F01
INPUT CODE
(b)
OUTPUT
VOLTAGE
NEGATIVE
OFFSET
0V
2048
0
4095
INPUT CODE
OUTPUT
VOLTAGE
(a)
VREF = VCC
VREF = VCC
(c)
INPUT CODE
OUTPUT
VOLTAGE
POSITIVE
FSE
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.
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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