LTC1664 Linear Technology, LTC1664 Datasheet - Page 10

• Manufacturer Part Number: LTC1664
• Description: Micropower Quad 10-Bit DAC
• Manufacturer: Linear Technology

OPERATIO
LTC1664
Voltage Outputs
Each of the four rail-to-rail output amplifiers contained in
these parts can source or sink up to 5mA. The outputs
swing to within a few millivolts of either supply rail when
unloaded and have an equivalent output resistance of 85
when driving a load to the rails. The output amplifiers are
stable driving capacitive loads up to 1000pF.
A small resistor placed in series with the output can be
used to achieve stability for any load capacitance. A 1 F
load can be successfully driven by inserting a 20 resis-
tor; a 2.2 F load needs only a 10 resistor. In either case,
larger values of resistance, capacitance or both may be
safely substituted for the values given.
10
U
Rail-to-Rail Output Considerations
In any rail-to-rail voltage output DAC, the output 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 3b.
Similarly, limiting can occur near full scale when the REF
pin is tied to 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
REF
as shown in Figure 3c. No full-scale limiting can occur
is less than V
CC
. If V
REF
CC
– FSE.
= V
CC
and the DAC full-scale error