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AD7399BRU-REEL7 Datasheet(PDF) 9 Page - Analog Devices |
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AD7399BRU-REEL7 Datasheet(HTML) 9 Page - Analog Devices |
9 / 24 page AD7398/AD7399 Rev. C | Page 9 of 24 TERMINOLOGY Relative Accuracy (INL) For the DAC, relative accuracy or integral nonlinearity (INL) is a measure of the maximum deviation, in LSBs, from a straight line passing through the endpoints of the DAC transfer function. Figure 6 illustrates a typical INL vs. code plot. Differential Nonlinearity (DNL) Differential nonlinearity is the difference between the measured change and the ideal 1 LSB change between any two adjacent codes. A specified differential nonlinearity of ±1 LSB maximum ensures monotonicity. Figure 8 illustrates a typical DNL vs. code plot. Zero-Scale Error (VZSE) Zero-scale error is a measure of the output voltage error from zero voltage when zero code is loaded to the DAC register. Full-Scale Error (VFSE) Full-scale error is a measure of the output voltage error from full-scale voltage when full-scale code is loaded to the DAC register. Full-Scale Temperature Coefficient (TCVFS) This is a measure of the change in full-scale error with a change in temperature. It is expressed in ppm/°C or mV/°C. DAC Glitch Impulse (Q) Digital-to-analog glitch impulse is the impulse injected into the analog output when the input code in the DAC register changes state. It is normally specified as the area of the glitch in nV −sand is measured when the digital input code is changed by 1 LSB at the major carry transition (midscale transition). A plot of the glitch impulse is shown in Figure 15. Digital Feedthrough (QDF) Digital feedthrough is a measure of the impulse injected into the analog output of the DAC from the digital inputs of the DAC, but is measured when the DAC output is not updated. CS Power Supply Sensitivity (PSS) is held high while the CLK and SDI signals are toggled. It is specified in nV − s, and is measured with a full-scale code change on the data bus, such as from all 0s to all 1s and vice versa. A typical plot of digital feedthrough is shown in Figure 16. This specification indicates how the output of the DAC is affected by changes in the power supply voltage. Power supply sensitivity is quoted in terms of % change in output per % change in VDD for full-scale output of the DAC. VDD is varied by ±10%. Reference Feedthrough (VOUT/VREF) This is a measure of the feedthrough from the VREF input to the DAC output when the DAC is loaded with all 0s. A 100 kHz, 1 V p-p is applied to VREF. Reference feedthrough is expressed in dB or mV p-p. |
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