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ADS5424-SP Datasheet(PDF) 11 Page - Texas Instruments |
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ADS5424-SP Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 24 page  THD + 10Log10 P S P D SINAD + 10Log10 P S P N ) PD SNR + 10Log10 P S P N 11 ADS5424-SP www.ti.com SLWS194D – MAY 2008 – REVISED SEPTEMBER 2013 Product Folder Links: ADS5424-SP Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated 7 DEFINITION OF SPECIFICATIONS Analog Bandwidth The analog input frequency at which the power of the fundamental is reduced by 3 dB with respect to the low-frequency value Aperture Delay The delay in time between the rising edge of the input sampling clock and the actual time at which the sampling occurs Aperture Uncertainty (Jitter) The sample-to-sample variation in aperture delay Clock Pulse Width/Duty Cycle The duty cycle of a clock signal is the ratio of the time the clock signal remains at a logic high (clock pulse width) to the period of the clock signal. Duty cycle is typically expressed as a percentage. A perfect differential sine wave clock results in a 50% duty cycle. Maximum Conversion Rate The maximum sampling rate at which certified operation is given. All parametric testing is performed at this sampling rate unless otherwise noted. Minimum Conversion Rate The minimum sampling rate at which the ADC functions Differential Nonlinearity (DNL) An ideal ADC exhibits code transitions at analog input values spaced exactly 1 LSB apart. DNL is the deviation of any single step from this ideal value, measured in units of LSB. Integral Nonlinearity (INL) INL is the deviation of the ADC transfer function from a best-fit line determined by a least-squares curve fit of that transfer function, measured in units of LSB. Gain Error Gain error is the deviation of the ADC actual input full-scale range from its ideal value. Gain error is given as a percentage of the ideal input full-scale range. Offset Error The offset error is the difference, given in number of LSBs, between the ADC's actual value average idle channel output code and the ideal average idle channel output code. This quantity is often mapped into mV. Temperature Drift The temperature drift coefficient (with respect to gain error and offset error) specifies the change per degree celsius of the parameter from TMIN or TMAX. It is computed as the maximum variation of that parameter over the whole temperature range divided by TMAX – TMIN. Signal-to-Noise Ratio (SNR) SNR is the ratio of the power of the fundamental (PS) to the noise floor power (PN), excluding the power at dc and in the first five harmonics. SNR is given either in units of dBc (dB to carrier) when the absolute power of the fundamental is used as the reference, or dBFS (dB to full scale) when the power of the fundamental is extrapolated to the converter’s full-scale range. Signal-to-Noise and Distortion (SINAD) SINAD is the ratio of the power of the fundamental (PS) to the power of all the other spectral components including noise (PN) and distortion (PD), but excluding dc. SINAD is given either in units of dBc (dB to carrier) when the absolute power of the fundamental is used as the reference, or dBFS (dB to Full Scale) when the power of the fundamental is extrapolated to the converter’s full-scale range. Total Harmonic Distortion (THD) THD is the ratio of the power of the fundamental (PS) to the power of the first five harmonics (PD). THD is typically given in units of dBc (dB to carrier). Spurious-Free Dynamic Range (SFDR) The ratio of the power of the fundamental to the highest other spectral component (either spur or harmonic). SFDR is typically given in units of dBc (dB to carrier). Two-Tone Intermodulation Distortion IMD3 is the ratio of the power of the fundamental (at frequencies f1, f2) to the power of the worst spectral component at either frequency 2f1 – f2 or 2f2 – f1). IMD3 is given either in units of dBc (dB to carrier) when the absolute power of the fundamental is used as the reference, or dBFS (dB to full scale) when it is referred to the full-scale range |
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