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AD7927BRUZ 数据表(PDF) 8 Page - Analog Devices |
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AD7927BRUZ 数据表(HTML) 8 Page - Analog Devices |
8 / 28 page AD7927 Data Sheet Rev. C | Page 8 of 28 TERMINOLOGY Integral Nonlinearity (INL) INL is the maximum deviation from a straight line passing through the endpoints of the ADC transfer function. The end- points 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. Figure 9 shows a typical INL plot for the AD7927. Differential Nonlinearity (DNL) DNL is the difference between the measured and the ideal 1 LSB change between any two adjacent codes in the ADC. Figure 10 shows a typical DNL plot for the AD7927. 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 out. 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 to the 2 × REFIN input range with −REFIN to +REFIN biased about the REFIN point. It is 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 to the 2 × REFIN input range with −REFIN to +REFIN biased about 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 out. 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 to the 2 × REFIN input range with −REFIN to +REFIN biased about 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 out. 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 crosstalk between channels. It is measured by applying a full- scale 400 kHz sine wave signal to all seven nonselected input channels and determining how much that signal is attenuated in the selected channel with a 50 kHz signal. The figure given is the worst case across all eight channels for the AD7927. Power Supply Rejection (PSR) Variations in power supply affect the full-scale transition, but not the converter’s linearity. Power supply rejection is the maximum change in full-scale transition point due to a change in power supply voltage from the nominal value (see the Typical Performance Characteristics section). Power Supply Rejection Ration (PSRR) The power supply 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): PSRR(dB) = 10log(Pf/PfS) where: Pf is equal to the power at Frequency f in ADC output. PfS is equal to the power at Frequency fS coupled onto the ADC AVDD. Here a 200 mV p-p sine wave is coupled onto the AVDD supply. Figure 6 shows the power supply rejection ratio vs. supply ripple frequency for the AD7927 with no decoupling. 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. |
类似零件编号 - AD7927BRUZ |
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类似说明 - AD7927BRUZ |
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