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AD4002 Datasheet(PDF) 16 Page - Analog Devices |
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AD4002 Datasheet(HTML) 16 Page - Analog Devices |
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16 / 36 page  AD4002/AD4006/AD4010 Preliminary Technical Data Rev. PrA | Page 16 of 36 TERMINOLOGY Integral Nonlinearity Error (INL) INL is the deviation of each individual code from a line drawn from negative full scale through positive full scale. The point used as negative full scale occurs ½ LSB before the first code transition. Positive full scale is defined as a level 1½ LSB beyond the last code transition. The deviation is measured from the middle of each code to the true straight line (see Figure 32). Differential Nonlinearity Error (DNL) In an ideal ADC, code transitions are 1 LSB apart. DNL is the maximum deviation from this ideal value. It is often specified in terms of resolution for which no missing codes are guaranteed. Zero Error Zero error is the difference between the ideal voltage that results in the first code transition (1/2 LSB above analog ground) and the actual voltage producing that code. Gain Error The first transition (from 100 ... 00 to 100 ... 01) occurs at a level ½ LSB above nominal negative full scale (−4.999981 V for the ±5 V range). The last transition (from 011 … 10 to 011 … 11) occurs for an analog voltage 1½ LSB below the nominal full scale (+4.999943 V for the ±5 V range). The gain error is the deviation of the difference between the actual level of the last transition and the actual level of the first transition from the difference between the ideal levels. Spurious-Free Dynamic Range (SFDR) SFDR is the difference, in decibels (dB), between the root mean square (rms) amplitude of the input signal and the peak spurious signal. Effective Number of Bits (ENOB) ENOB is a measurement of the resolution with a sine wave input. It is related to SINAD as follows: ENOB = (SINADdB − 1.76)/6.02 ENOB is expressed in bits. Total Harmonic Distortion (THD) THD is the ratio of the rms sum of the first five harmonic components to the rms value of a full-scale input signal and is expressed in decibels. Dynamic Range Dynamic range is the ratio of the rms value of the full scale to the total rms noise measured. The value for dynamic range is expressed in decibels. It is measured with a signal at −60 dBFS so that it includes all noise sources and DNL artifacts. Signal-to-Noise Ratio (SNR) SNR is the ratio of the rms value of the actual input signal to the rms sum of all other spectral components below the Nyquist frequency, excluding harmonics and dc. The value for SNR is expressed in decibels. Signal-to-Noise-and-Distortion Ratio (SINAD) SINAD is the ratio of the rms value of the actual input signal to the rms sum of all other spectral components that are less than the Nyquist frequency, including harmonics but excluding dc. The value of SINAD is expressed in decibels. Aperture Delay Aperture delay is the measure of the acquisition performance and is the time between the rising edge of the CNV input and when the input signal is held for a conversion. Transient Response Transient response is the time required for the ADC to acquire a full-scale input step to ±0.5 LSB accuracy. Power Supply Rejection Ratio (PSRR) PSRR is the ratio of the power in the ADC output at the frequency, f, to the power of a 200 mV p-p sine wave applied to the ADC VDD supply of frequency, f. PSRR (dB) = 10 log(PVDD_IN/PADC_OUT) where: PVDD_IN is the power at the frequency, f, at the VDD pin. PADC_OUT is the power at the frequency, f, in the ADC output. |
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