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AD7923BRUZ-REEL7 Datasheet(PDF) 10 Page - Analog Devices |
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AD7923BRUZ-REEL7 Datasheet(HTML) 10 Page - Analog Devices |
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10 / 24 page  AD7923 Rev. C | Page 10 of 24 TERMINOLOGY Integral Nonlinearity This is the maximum deviation from a straight line passing through the endpoints of the ADC transfer function. The endpoints of the transfer function 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 This is the difference between the measured and the ideal 1 LSB change between any two adjacent codes in the ADC. Offset Error This is the deviation of the first code transition (00 ... 000) to (00 ... 001) from the ideal, that is, AGND + 1 LSB. Offset Error Match This is the difference in offset error between any two channels. Gain Error This is the deviation of the last code transition (111 ... 110) to (111 ... 111) from the ideal (that is, REFIN – 1 LSB) after the offset error has been adjusted. Gain Error Match This is the difference in gain error between any two channels. Zero-Code Error This applies when using the twos complement output coding option, in particular, with the 2 × REFIN input range when −REFIN to +REFIN is biased around the REFIN point. It defined as the deviation of the midscale transition (all 0s to all 1s) from the ideal VIN voltage, that is, REFIN – 1 LSB. Zero-Code Error Match This is the difference in zero-code error between any two channels. Positive Gain Error This applies when using the twos complement output coding option, in particular, with the 2 × REFIN input range when −REFIN to +REFIN is biased around the REFIN point. It is the deviation of the last code transition (011 ... 110) to (011 ... 111) from the ideal (that is, +REFIN – 1 LSB) after the zero-code error has been adjusted. Positive Gain Error Match This is the difference in positive gain error between any two channels. Negative Gain Error This applies when using the twos complement output coding option, in particular, with the 2 × REFIN input range when −REFIN to +REFIN is biased around the REFIN point. It is the deviation of the first code transition (100 ... 000) to (100 ... 001) from the ideal (that is, −REFIN + 1 LSB) after the zero-code error has been adjusted. Negative Gain Error Match This is the difference in negative gain error between any two channels. Channel-to-Channel Isolation Channel-to-channel isolation is a measure of the level of cross- talk between channels. It is measured by applying a full-scale 400 kHz sine wave signal to all three nonselected input channels and determining how much that signal is attenuated in the selected channel with a 50 kHz signal. The figure is given in the worst-case across all four channels for the AD7923. Power Supply Rejection (PSR) Variations in power supply affect the full-scale transition, but not the converter’s linearity. Power supply rejection is the maxi- mum change in the full-scale transition point from a change in power supply voltage from the nominal value. Figure 6 shows the power supply rejection ratio vs. supply ripple frequency for the AD7923 with no decoupling. The power sup- ply rejection ratio is defined as the ratio of the power in the ADC output at full-scale frequency, f, to the power of a 200 mV p-p sine wave applied to the ADC AVDD supply of frequency fS: PSSR (dB) = 10log(Pf/PfS) Pf is equal to the power at frequency f in the ADC output; PfS is equal to the power at frequency fS coupled onto the ADC AVDD supply. Track-and-Hold Acquisition Time The track-and-hold amplifier returns into track mode at the end of conversion. Track-and-hold acquisition time is the time required for the output of the track-and-hold amplifier to reach its final value, within ±1 LSB, after the end of conversion. |
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