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AD7091R Datenblatt(PDF) 11 Page - Analog Devices |
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AD7091R Datenblatt(HTML) 11 Page - Analog Devices |
11 / 20 page Data Sheet AD7091R Rev. 0 | Page 11 of 20 TERMINOLOGY Integral Nonlinearity (INL) INL is the maximum deviation from a straight line passing through the endpoints of the ADC transfer function. For the AD7091R, the endpoints of the transfer function are zero scale (a point 0.5 LSB below the first code transition) and full scale (a point 0.5 LSB above the last code transition). Differential Nonlinearity (DNL) DNL is the difference between the measured and the ideal 1 LSB change between any two adjacent codes in the ADC. Offset Error Offset error is the deviation of the first code transition (00 ... 000) to (00 ... 001) from the ideal (such as GND + 0.5 LSB). Gain Error Gain error is the deviation of the last code transition (111 ... 110) to (111 ... 111) from the ideal (such as VREF − 1.5 LSB) after the offset error has been adjusted out. Track-and-Hold Acquisition Time The track-and-hold amplifier returns to track mode after the end of a 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 ±0.5 LSB, after a conversion (see the Serial Interface section for more details). Signal-to-Noise Ratio (SNR) SNR is the measured ratio of signal to noise at the output of the ADC. The signal is the rms amplitude of the fundamental. Noise is the sum of all nonfundamental signals up to half the sampling frequency (fSAMPLE/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 ratio for an ideal N-bit converter with a sine wave input is given by Signal-to-Noise Ratio = (6.02N + 1.76) dB Therefore, for a 12-bit converter, the SNR is 74 dB. Signal-to-Noise-and-Distortion Ratio (SINAD) SINAD is the measured ratio of signal to noise and distortion at the output of the ADC. The signal is the rms value of the sine wave, and noise is the rms sum of all nonfundamental signals up to half the sampling frequency (fSAMPLE/2), including harmonics, but excluding dc. Total Unadjusted Error (TUE) TUE is a comprehensive specification that includes the gain, linearity, and offset errors. Total Harmonic Distortion (THD) THD is the ratio of the rms sum of harmonics to the fundamental. For the AD7091R, THD 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. V2, V3, V4, V5, and V6 are the rms amplitudes of the second through the sixth harmonics. Spurious Free Dynamic Range (SFDR) SFDR, also known as 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 fSAMPLE/2 and excluding dc) to the rms value of the fundamental. Usually, the value of this specifi- cation is determined by the largest harmonic in the spectrum, but for ADCs where the harmonics are buried in the noise floor, the largest harmonic would be a noise peak. Aperture Delay Aperture delay is the measured interval between the leading edge of the sampling clock and the point at which the ADC samples data. Aperture Jitter Aperture jitter is the sample-to-sample variation in the effective point in time at which the data is sampled. Full Power Bandwidth Full power bandwidth is the input frequency at which the amplitude of the reconstructed fundamental is reduced by 0.1 dB or 3 dB for a full-scale input. |
Ähnliche Teilenummer - AD7091R |
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Ähnliche Beschreibung - AD7091R |
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