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LTC1654 Datasheet(PDF) 11 Page - Linear Technology |
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LTC1654 Datasheet(HTML) 11 Page - Linear Technology |
11 / 16 page 11 LTC1654 1654fb Rail-to-Rail Output Considerations Rail-to-rail DACs take full advantage of the supply range available to them, but cannot produce output voltages above VCC or below ground. See Figure 2a. If REFLO is tied to GND, the output for the lowest codes may limit at 0V, as shown in Figure 2b. Similarly, limiting can occur near full scale if the REFHI pin is tied to VCC, as shown in Figure 2c. The offset, gain error and linearity of the LTC1654 are defined and tested in output ranges that avoid limiting. The low code kL used in these measurements is defined as the code which gives a nominal output of 32mV above ground; see Table 2. 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 1654 F02 INPUT CODE (b) OUTPUT VOLTAGE NEGATIVE OFFSET 0V 8192 0 16383 INPUT CODE OUTPUT VOLTAGE (a) VREF = VCC VREF = VCC (c) INPUT CODE OUTPUT VOLTAGE POSITIVE FSE APPLICATIO S I FOR ATIO Table 2. Low Code kL VREFHI, V 4.096 2.048 1 128 256 1/2 256 512 Note: VREFLO = O |
Similar Part No. - LTC1654_1 |
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Similar Description - LTC1654_1 |
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