LTC1663 データシートの表示（PDF） - Linear Technology
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LTC1663 Datasheet PDF : 12 Pages
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LTC1663
APPLICATIONS INFORMATION
OUTPUT
VOLTAGE
VREF = VCC
VREF = VCC
INPUT CODE
(c)
POSITIVE
FSE
OUTPUT
VOLTAGE
OUTPUT
VOLTAGE
0
512
1023
INPUT CODE
(a)
0V
NEGATIVE
OFFSET
INPUT CODE
(b)
1663 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
Offset and linearity are defined and tested over the region
of the DAC transfer function where no output limiting can
occur.
Internal Reference
In applications where a predictable output is required
that is independent of supply voltage, the LTC1663 has a
user-selectable internal reference. Selecting the internal
reference will set the full-scale output voltage to 2.5V. This
can be useful in applications where the supply voltage is
poorly regulated.
Using the LT®1460 Micropower Series Reference as a
Power Supply for the LTC1663
In applications where the advantages of using the internal
reference are required but the full-scale range needs to
be greater than 2.5V, an external series reference can be
used. The LT1460 is ideal for use as a power supply for
the LTC1663 and can provide 3V, 3.3V and 5V full-scale
output voltage ranges. The LT1460 provides accuracy, noise
immunity and extended supply range to the LTC1663 when
the LTC1663 is operated ratiometric to VCC. Since both
parts are available in SOT-23 packages, the PC board space
for this application is extremely small. See Figure 2.
3.9V TO 20V
0.1μF
1 LT1460S3-3 2
IN
OUT
GND
+
3
0.01μF
3V
4 (5)
VCC
5 (4)
SCL
TO
LTC1663
μP
1 (1)
SDA
GND
LTC1663 PIN NUMBERS IN PARENTHESES
2 (7)
REFER TO MSOP PACKAGE
3 (8)
OUT
0V ≤ VOUT ≤ 3V
1663 F02
Figure 2. LT1460 As Power Supply for the LTC1663
1663fd
10
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