ltc1658is8-trpbf Linear Technology Corporation, ltc1658is8-trpbf Datasheet - Page 8

• Manufacturer Part Number: ltc1658is8-trpbf
• Description: Ltc1658 - 14-bit Rail-to-rail Micropower Dac
• Manufacturer: Linear Technology Corporation

APPLICATIONS
LTC1658
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 V
8
NEGATIVE
OFFSET
VOLTAGE
OUTPUT
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 V
0V
CC
. If V
U
REF
= V
INPUT CODE
INFORMATION
U
CC
(b)
and the DAC full-scale error
W
VOLTAGE
OUTPUT
0
U
INPUT CODE
V
REF
8192
(a)
= V
(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
CC
REF
as shown in Figure 1c. No full-scale limiting can occur
is less than V
16383
CC
– FSE.
V
REF
INPUT CODE
= V
(c)
CC
REF
= V
CC
OUTPUT
VOLTAGE
POSITIVE
FSE
1658 F01