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LTC1661IN8 Datasheet(PDF) 9 Page - Linear Technology |
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LTC1661IN8 Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page 9 LTC1661 Voltage Outputs Each of the rail-to-rail output amplifiers contained in the LTC1661 can typically source or sink up to 5mA (VCC = 5V). The outputs swing to within a few millivolts of either supply when unloaded and have an equivalent output resistance of 85 Ω (typical) when driving a load to the rails. The output amplifiers are stable driving capaci- tive 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 µF load can be successfully driven by inserting a 20 Ω resistor in series with the VOUT pin. A 2.2µF load needs only a 10Ω resistor, and a 10 µF electrolytic capacitor can be used without any resistor (the equivalent series resistance of the capacitor itself provides the required small resis- tance). In any of these cases, larger values of resistance, capacitance or both may be substituted for the values given. OPERATIO 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 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 2c. 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. 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 VREF = VCC 1661 F02 INPUT CODE (b) OUTPUT VOLTAGE NEGATIVE OFFSET 0V 512 0 1023 INPUT CODE OUTPUT VOLTAGE (a) VREF = VCC VREF = VCC (c) INPUT CODE OUTPUT VOLTAGE POSITIVE FSE |
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