DEFINITION OF SPECIFICATIONS
ADS5424-SP
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....................................................................................................................................................................................................... SLWS194 – MAY 2008
Temperature DriftAnalog Bandwidth
The temperature drift coefficient (with respect to gainThe analog input frequency at which the power of the
error and offset error) specifies the change perfundamental is reduced by 3 dB with respect to the
degree celsius of the parameter from T
MIN
or T
MAX
. Itlow-frequency value
is computed as the maximum variation of thatparameter over the whole temperature range dividedAperture Delay
by T
MAX
– T
MIN
.The delay in time between the rising edge of the inputsampling clock and the actual time at which the
Signal-to-Noise Ratio (SNR)sampling occurs
SNR is the ratio of the power of the fundamental (P
S
)to the noise floor power (P
N
), excluding the power atAperture Uncertainty (Jitter)
dc and in the first five harmonics.The sample-to-sample variation in aperture delay
Clock Pulse Width/Duty CycleThe duty cycle of a clock signal is the ratio of the timethe clock signal remains at a logic high (clock pulse
SNR is given either in units of dBc (dB to carrier)width) to the period of the clock signal. Duty cycle is
when the absolute power of the fundamental is usedtypically expressed as a percentage. A perfect
as the reference, or dBFS (dB to full scale) when thedifferential sine wave clock results in a 50% duty
power of the fundamental is extrapolated to thecycle.
converter ’ s full-scale range.Maximum Conversion Rate
Signal-to-Noise and Distortion (SINAD)The maximum sampling rate at which certified
SINAD is the ratio of the power of the fundamentaloperation is given. All parametric testing is performed
(P
S
) to the power of all the other spectral componentsat this sampling rate unless otherwise noted.
including noise (P
N
) and distortion (P
D
), but excludingdc.Minimum Conversion RateThe minimum sampling rate at which the ADCfunctions
Differential Nonlinearity (DNL)
SINAD is given either in units of dBc (dB to carrier)An ideal ADC exhibits code transitions at analog input
when the absolute power of the fundamental is usedvalues spaced exactly 1 LSB apart. DNL is the
as the reference, or dBFS (dB to Full Scale) when thedeviation of any single step from this ideal value,
power of the fundamental is extrapolated to themeasured in units of LSB.
converter ’ s full-scale range.Integral Nonlinearity (INL)
Total Harmonic Distortion (THD)INL is the deviation of the ADC transfer function from
THD is the ratio of the power of the fundamental (P
S
)a best-fit line determined by a least-squares curve fit
to the power of the first five harmonics (P
D
).of that transfer function, measured in units of LSB.
Gain ErrorGain error is the deviation of the ADC actual inputfull-scale range from its ideal value. Gain error is THD is typically given in units of dBc (dB to carrier).given as a percentage of the ideal input full-scale
Spurious-Free Dynamic Range (SFDR)range.
The ratio of the power of the fundamental to theOffset Error
highest other spectral component (either spur orThe offset error is the difference, given in number of harmonic). SFDR is typically given in units of dBc (dBLSBs, between the ADC's actual value average idle to carrier).channel output code and the ideal average idle
Two-Tone Intermodulation Distortionchannel output code. This quantity is often mapped
IMD3 is the ratio of the power of the fundamental (atinto mV.
frequencies f
1
, f
2
) to the power of the worst spectralcomponent at either frequency 2f
1
– f
2
or 2f
2
– f
1
).IMD3 is given either in units of dBc (dB to carrier)when the absolute power of the fundamental is usedas the reference, or dBFS (dB to full scale) when it isreferred to the full-scale range
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