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AD7302BRU Scheda tecnica(PDF) 6 Page - Analog Devices |
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AD7302BRU Scheda tecnica(HTML) 6 Page - Analog Devices |
6 / 16 page AD7302 –6– REV. 0 TERMINOLOGY INTEGRAL NONLINEARITY For the DACs, relative accuracy or endpoint nonlinearity is a measure of the maximum deviation, in LSBs, from a straight line passing through the endpoints of the DAC transfer function. A graphical representation of the transfer curve is shown in Figure 14. DIFFERENTIAL NONLINEARITY 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. ZERO CODE ERROR Zero Code Error is the measured output voltage from VOUT of either DAC when zero code (all zeros) is loaded to the DAC latch. It is due to a combination of the offset errors in the DAC and output amplifier. Zero scale error is expressed in LSBs. GAIN ERROR This is a measure of the span error of the DAC. It is the deviation in slope of the DAC transfer characteristic from ideal, expressed as a percent of the full-scale value. It includes full-scale errors but not offset errors. DIGITAL-TO-ANALOG GLITCH IMPULSE Digital-to-Analog Glitch Impulse is the impulse injected into the analog output when the digital inputs change state with the DAC selected and the LDAC used to update the DAC. It is normally specified as the area of the glitch in nV-s and is measured when the digital input code is changed by 1 LSB at the major carry transition. DIGITAL FEEDTHROUGH Digital Feedthrough is a measure of the impulse injected into the analog output of a DAC from the digital inputs of the same DAC, but is measured when the DAC is not updated. It is specified in nV-s and measured with a full-scale code change on the data bus, i.e., from all 0s to all 1s and vice versa. DIGITAL CROSSTALK Digital Crosstalk is the glitch impulse transferred to the output of one converter due to a digital code change to another DAC. It is specified in nV-s. ANALOG CROSSTALK Analog Crosstalk is a change in output of any DAC in response to a change in the output of the other DAC. It is measured in LSBs. POWER SUPPLY REJECTION RATIO (PSRR) This specification indicates how the output of the DAC is affected by changes in the power supply voltage. Power supply rejection ratio is quoted in terms of % change in output per % change in VDD for full-scale output of the DAC. VDD is varied ±10%. |
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