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AD7265 데이터시트(PDF) 8 Page - Analog Devices |
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AD7265 데이터시트(HTML) 8 Page - Analog Devices |
8 / 16 page AD7265 Preliminary Technical Data TERMINOLOGY Differential Nonlinearity Track-and-Hold Acquisition Time This is the difference between the measured and the ideal 1 LSB change between any two adjacent codes in the ADC. The track-and-hold amplifier returns into 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. 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. Signal to (Noise + Distortion) Ratio This is the measured ratio of signal to (noise + distortion) at the output of the A/D converter. 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: Offset Error This applies to Straight Binary output coding. It is the deviation of the first code transition (00 . . . 000) to (00 . . . 001) from the ideal, i.e., AGND + 1 LSB. Offset Error Match Signal to (Noise + Distortion) = (6.02N + 1.76) dB This is the worst case difference in Offset Error between any of the twelve channels. Thus for a 12-bit converter, this is 74 dB. Total Harmonic Distortion Gain Error Total harmonic distortion (THD) is the ratio of the rms sum of harmonics to the fundamental. For the AD7265 it is defined as: This applies to Straight Binary output coding. It 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. 1 2 6 2 5 2 4 2 3 2 2 log 20 ) ( V V V V V V dB THD + + + + = Gain Error Match where V1 is the rms amplitude of the fundamental and V2, V3, V4, V5 and V6 are the rms amplitudes of the second through the sixth harmonics. This is the difference in Gain Error between the two channels. Zero Code Error Peak Harmonic or Spurious Noise This applies when using twos complement output coding in particular with the 2 x 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, i.e., VREF - 1 LSB. 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 and 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 will be a noise peak. Zero Code Error Match This refers to the difference in Zero Code Error between the 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 (2 x VREF), 455kHz sine wave signal to all unselected input channels and determining how much that signal is attenuated in the selected channel with a 10 kHz signal (0 V to VREF). The figure given is the worst-case across all twelve channels for the AD7265. Positive Gain Error This applies when using twos complement output coding in particular with the 2 x 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 (i.e., + VREF - 1 LSB) after the Zero Code Error has been adjusted out. Rev. PrA | Page 8 of 16 |
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