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AD7490BCPZ-REEL7 Arkusz danych(PDF) 11 Page - Analog Devices |
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AD7490BCPZ-REEL7 Arkusz danych(HTML) 11 Page - Analog Devices |
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11 / 29 page  AD7490 Data Sheet Rev. D | Page 10 of 28 TERMINOLOGY Integral Nonlinearity This 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. 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 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 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 15 nonselected input channels and determining how much that signal is attenuated in the selected channel with a 50 kHz signal. This specification is the worst case across all 16 channels for the AD7490. PSR (Power Supply Rejection) Variations in power supply affect the full scale transition, but not the converter linearity. Power supply rejection is the maximum change in the full-scale transition point due to a change in power supply voltage from the nominal value. (see the Typical Performance Characteristics section). Track-and-Hold Acquisition Time The track-and-hold amplifier returns into track on the 14th SCLK falling edge. Track-and-hold acquisition time is the minimum time required for the track-and-hold amplifier to remain in track mode for its output to reach and settle to within ±1 LSB of the applied input signal, given a step change to the input signal. Signal-to-(Noise + Distortion) Ratio This is the measured ratio of signal to (noise + distortion) at the output of the analog-to-digital converter. The signal is the rms amplitude of the fundamental. Noise is the sum of all nonfunda- mental 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 quan- tization 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) (dB) = 6.02N + 1.76 Thus for a 12-bit converter, this is 74 dB. Total Harmonic Distortion Total harmonic distortion (THD) is the ratio of the rms sum of harmonics to the fundamental. For the AD7490, it is defined as ( ) 1 6 5 4 3 2 V V V V V V THD 2 2 2 2 2 log 20 dB + + + + × = 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. |
Podobny numer części - AD7490BCPZ-REEL7 |
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Podobny opis - AD7490BCPZ-REEL7 |
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