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AD7294 데이터시트(PDF) 10 Page - Analog Devices |
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AD7294 데이터시트(HTML) 10 Page - Analog Devices |
10 / 45 page AD7294 Preliminary Technical Data Rev. PrB | Page 10 of 45 TERMINOLOGY Integral Nonlinearity The maximum deviation from a straight line passing through the endpoints of the ADC/DAC transfer function. The endpoints are zero scale, a point 1 LSB. below the first code transition, and full scale, a point 1 LSB above the last code transition. Differential Nonlinearity Differential nonlinearity (DNL) 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. Gain Error Gain error 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 percentage of the full-scale range. Gain Error Match The difference in gain error between any two channels. Zero-Code Error Zero-code error is a measure of the output error when zero code (0x000) is loaded into the DAC register. Ideally, the output should be 0 V. Zero-code error is due to a combination of the offset errors in the DAC and output amplifier. Zero-code error is expressed in mV. Full-Scale Error Full-scale error is a measure of the output error when full-scale code (0xFFFF) is loaded into the DAC register. Ideally, the output should be VDD − 1 LSB. Full-scale error is expressed in mV. Zero-Code Error Drift Zero-code error drift is a measure of the change in zero-code error with a change in temperature. It is expressed in µV/°C. Gain Error Drift Gain error drift is a measure of the change in gain error with changes in temperature. It is expressed in (ppm of full-scale range)/°C. Digital-to-Analog Glitch Impulse 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-s and is measured when the digital input code is changed by 1 LSB at the major carry transition (0x2000 to 0x1FFF). Digital Feedthrough 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. It is specified in nV-s and is measured with a full-scale code change on the data bus—from all 0s to all 1s or vice versa. Channel-to-Channel Isolation A measure of the level of crosstalk between channels, taken by applying a full-scale sine wave signal to the unselected input channels and determining how much of the 108 Hz signal is attenuated in the selected channel. The sine wave signal applied to the unselected channels is then varied from 1 kHz up to 2 MHz, and each time it is determined how much of the 108 Hz signal in the selected channel is attenuated. This figure represents the worst-case level across all channels. Aperture Delay The measured interval between the sampling clock’s leading edge and the point at which the ADC takes the sample. Aperture Jitter The sample-to-sample variation in the effective point in time at which the sample is taken. Offset Error The deviation of the first code transition (00 … 000) to (00 … 001) from the ideal—that is, AGND + 1 LSB. Offset Error Match The difference in offset error between any two channels. |
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