LTC1664_1 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC1664_1' PDF : 16 Pages View PDF
LTC1664
U
OPERATIO
Voltage Outputs
Each of the four rail-to-rail output amplifiers contained in
the LTC1664 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 85Ω
when driving a load to the rails. The output amplifiers are
stable driving capacitive loads of up to 1000pF.
A small resistor placed in series with the output can be
used to achieve stability for any load capacitance. A 1µF
load can be successfully driven by inserting a 20Ω resis-
tor; a 2.2µF load needs only a 10Ω resistor. In either case,
larger values of resistance, capacitance or both may be
safely substituted for the values given.
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 VCC. If VREF = VCC and the DAC full-scale error
(FSE) is positive, the output for the highest codes limits at
VCC as shown in Figure 3c. No full-scale limiting can occur
if VREF is less than VCC – FSE.
Offset and linearity are defined and tested over the region
of the DAC transfer function where no output limiting can
occur.
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