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ADS5423IPJYRG4 Datasheet(PDF) 7 Page - Texas Instruments |
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ADS5423IPJYRG4 Datasheet(HTML) 7 Page - Texas Instruments |
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7 / 24 page  ADS5423 SLWS160 − FEBRUARY 2005 www.ti.com 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. The DNL is the deviation of any single step from this ideal value, measured in units of LSB. Integral Nonlinearity (INL) The INL is the deviation of the ADC’s 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 The gain error is the deviation of the ADC’s actual input full-scale range from its ideal value. The 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. PSRR The maximum change in offset voltage divided by the total change in supply voltage, in units of mV/V. Temperature Drift The temperature drift coefficient (with respect to gain error and offset error) specifies the change per degree celcius of the paramter 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 the first five harmonics. SNR + 10Log10 P S PN SNR is either given 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 + 10Log10 P S PN ) PD SINAD is either given 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 fundamental power (PS) to the power of the first five harmonics (PD). THD + 10Log10 P S PD THD is typically given in units of dBc (dB to carrier). Power Up Time The difference in time from the point where the supplies are stable at ±5% of the final value, to the time the ac test is past. |
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