LTC1654 LINER [Linear Technology], LTC1654 Datasheet - Page 8

• Manufacturer Part Number: LTC1654
• Description: Dual 14-Bit Rail-to-Rail DAC in 16-Lead SSOP Package
• Manufacturer: LINER [Linear Technology]

APPLICATIONS
LTC1654
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 2b.
Similarly, limiting can occur near full scale when the REF
pin is tied to V
8
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
NEGATIVE
OFFSET
VOLTAGE
OUTPUT
0V
CC
. If V
U
REF
= V
INFORMATION
U
INPUT CODE
CC
(b)
and the DAC full-scale error
W
VOLTAGE
OUTPUT
0
U
V
REF
= V
CC
INPUT CODE
8192
(a)
(FSE) is positive, the output for the highest codes limits at
V
if V
Offset and linearity are defined and tested over the region
of the DAC transfer function where no output limiting can
occur.
CC
REF
as shown in Figure 2c. No full-scale limiting can occur
is less than (V
16383
V
CC
REF
INPUT CODE
– FSE).
= V
(c)
CC
REF
OUTPUT
VOLTAGE
= V
POSITIVE
FSE
1654 F02
CC