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AD7266BCPZ-REEL7 数据表(PDF) 11 Page - Analog Devices |
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AD7266BCPZ-REEL7 数据表(HTML) 11 Page - Analog Devices |
11 / 28 page AD7266 Rev. B | Page 11 of 28 TERMINOLOGY Differential Nonlinearity (DNL) Differential nonlinearity is the difference between the measured and the ideal 1 LSB change between any two adjacent codes in the ADC. Integral Nonlinearity (INL) Integral nonlinearity 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 with a single (1) LSB point below the first code transition, and full scale with a 1 LSB point above the last code transition. Offset Error Offset error applies to straight binary output coding. It is the deviation of the first code transition (00 . . . 000) to (00 . . . 001) from the ideal (AGND + 1 LSB). Offset Error Match Offset error match is the difference in offset error across all 12 channels. Gain Error Gain error applies to straight binary output coding. It is the deviation of the last code transition (111 . . . 110) to (111 . . . 111) from the ideal (VREF − 1 LSB) after the offset error is adjusted out. Gain error does not include reference error. Gain Error Match Gain error match is the difference in gain error across all 12 channels. Zero Code Error Zero code error applies when using twos complement output coding with, for example, the 2 × VREF input range as −VREF to +VREF biased about the VREF point. It is the deviation of the midscale transition (all 1s to all 0s) from the ideal VIN voltage (VREF). Zero Code Error Match Zero code error match refers to the difference in zero code error across all 12 channels. Positive Gain Error This applies when using twos complement output coding with, for example, the 2 × VREF input range as −VREF to +VREF biased about the VREF point. It is the deviation of the last code transition (011…110) to (011…111) from the ideal (+VREF − 1 LSB) after the zero code error is adjusted out. Track-and-Hold Acquisition Time The track-and-hold amplifier returns to track mode after 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 ±1/2 LSB, after the end of conversion. Signal-to-(Noise + Distortion) Ratio This ratio is the measured ratio of signal-to-(noise + distortion) at the output of the ADC. The signal is the rms amplitude of the fundamental. Noise is the sum of all non-fundamental signals up to half the sampling frequency (fS/2), excluding dc. The ratio is dependent on the number of quantization levels in the digitization process; the more levels, the smaller the quantization noise. The theoretical signal-to-(noise + distortion) ratio for an ideal N-bit converter with a sine wave input is given by Signal-to-(Noise + Distortion) = (6.02N + 1.76) dB Therefore, for a 12-bit converter, this is 74 dB. Total Harmonic Distortion (THD) Total harmonic distortion is the ratio of the rms sum of harmonics to the fundamental. For the AD7266, it is defined as 1 2 6 2 5 2 4 2 3 2 2 log 20 ) ( V V V V V V dB THD + + + + = where: V1 is the rms amplitude of the fundamental. V2, V3, V4, V5, and V6 are the rms amplitudes of the second through the sixth harmonics. Peak Harmonic or Spurious Noise Peak harmonic, or spurious noise, is defined as the ratio of the rms value of the next largest component in the ADC output spectrum (up to fS/2, excluding dc) to the rms value of the fundamental. Normally, the value of this specification is determined by the largest harmonic in the spectrum, but for ADCs where the harmonics are buried in the noise floor, it is a noise peak. 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 (2 × VREF when VDD = 5 V, VREF when VDD = 3 V), 10 kHz sine wave signal to all unselected input channels and determining how much that signal is attenuated in the selected channel with a 50 kHz signal (0 V to VREF). The result obtained is the worst-case across all 12 channels for the AD7266. Intermodulation Distortion With inputs consisting of sine waves at two frequencies, fa and fb, any active device with nonlinearities create distortion products at sum, and difference frequencies of mfa ± nfb where m, n = 0, 1, 2, 3, and so on. Intermodulation distortion terms are those for which neither m nor n are equal to zero. For example, the second-order terms include (fa + fb) and (fa − fb), while the third-order terms include (2fa + fb), (2fa − fb), (fa + 2fb), and (fa − 2fb). |
类似零件编号 - AD7266BCPZ-REEL7 |
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类似说明 - AD7266BCPZ-REEL7 |
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