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AD7938BCP-6 Folha de dados(PDF) 9 Page - Analog Devices |
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AD7938BCP-6 Folha de dados(HTML) 9 Page - Analog Devices |
9 / 32 page AD7938-6 Rev. 0 | Page 9 of 32 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, i.e., 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 (i.e., VREF – 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 × VREF input range with −VREF to +VREF biased about the VREFIN point. It is the deviation of the mid scale transition (all 0s to all 1s) from the ideal VIN voltage, i.e., VREF. 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 × VREF input range with −VREF to +VREF biased about the VREFIN point. It is the deviation of the last code transition (011. . .110) to (011 .. . 111) from the ideal (i.e., +VREF − 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 × VREF input range with −VREF to +VREF biased about the VREF point. It is the deviation of the first code transition (100 . . . 000) to (100 . . . 001) from the ideal (i.e., −VREFIN + 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 sine wave signal to all seven nonselected input channels and applying a 50 kHz signal to the selected channel. The channel-to-channel isolation is defined as the ratio of the power of the 50 kHz signal on the selected channel to the power of the noise signal on the unselected channels that appears in the FFT of this channel. The noise frequency on the unselected channels varies from 40 kHz to 740 kHz. The noise amplitude is at 2 × VREF, while the signal amplitude is at 1 × VREF. Power Supply Rejection Ratio (PSRR) PSRR is defined as the ratio of the power in the ADC output at full-scale frequency, f, to the power of a 100 mV p-p sine wave applied to the ADC VDD supply of frequency fS. The frequency of the noise varies from 1 kHz to 1 MHz. PSRR (dB) = 10log(Pf/PfS) Pf is the power at frequency f in the ADC output; PfS is the power at frequency fS in the ADC output. Common-Mode Rejection Ratio (CMRR) CMRR is defined as the ratio of the power in the ADC output at full-scale frequency, f, to the power of a 100 mV p-p sine wave applied to the common-mode voltage of VIN+ and VIN− of frequency fS as CMRR (dB) = 10log (Pf/PfS) Pf is the power at frequency f in the ADC output; PfS is the power at frequency fS in the ADC output. Track-and-Hold Acquisition Time The track-and-hold amplifier returns to track mode at the end of conversion. The track-and-hold acquisition time is the time required for the output of the track-and-hold amplifier to reach its final value, within ±1/2 LSB, after the end of conversion. |
Nº de peça semelhante - AD7938BCP-6 |
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Descrição semelhante - AD7938BCP-6 |
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