LTC1657 LINER [Linear Technology], LTC1657 Datasheet - Page 9

• Manufacturer Part Number: LTC1657
• Description: Parallel 16-Bit Rail-to-Rail Micropower DAC
• Manufacturer: LINER [Linear Technology]

APPLICATIONS
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.
NEGATIVE
Figure 2. 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 V
OFFSET
VOLTAGE
OUTPUT
0V
U
INFORMATION
U
INPUT CODE
(b)
W
VOLTAGE
OUTPUT
V
CC
0
U
V
REF
= V
CC
INPUT CODE
/2
32768
(a)
Similarly, limiting can occur near full scale when the REF
pin is tied to V
error (FSE) is positive, the output for the highest codes
limits at V
can occur if V
Offset and linearity are defined and tested over the region
of the DAC transfer function where no output limiting can
occur.
65535
CC
as shown in Figure 1c. No full-scale limiting
CC
REF
/2. If V
is less than (V
REF
INPUT CODE
(c)
= V
CC
V
REF
CC
/2 and the DAC full-scale
= V
CC
– FSE)/2.
/2
REF
LTC1657
V
OUTPUT
VOLTAGE
CC
= V
1657 F02
POSITIVE
FSE
CC
/2
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