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5343C–BDC–03/06
TS86101G2B
10. Definitions of Terms
Table 3. Definitions of Terms
Abbreviation
Definition
Description
(ACPR)
Adjacent Channel Power
Ratio
The ratio in dB between the power in the adjacent channel and the power in the
channel carrying the modulated signal
(DNL)
Differential Non-linearity
The maximum deviation in the output step size from the ideal value of one least
significant bit (LSB). A DNL of -1 LSB means that a DAC converter guarantees the
transfer function is monotonic
(FSR)
Full-scale Range
The maximum difference between the highest and lowest input levels for which
various device performance specifications prevail, unless otherwise noted
(IMD)
Inter-modulation Distortion
The two tones intermodulation (IMD) rejection is the ratio of either output tone to
the worst intermodulation products. The output tone levels are at -6 dB full-scale
(INL)
Integral Non-linearity
The maximum deviation of the output transfer curve at each code from the ideal
one after the gain and offset error are corrected
(NPR)
Noise Power Ratio
The NPR is measured to characterize the DAC’s capacity to synthesize a
broadband signal. When using a notch-filtered broadband white-noise DAC input
pattern, the Noise Power Ratio is defined as the ratio of the average out-of-notch
to the average in-notch power spectral density magnitude at the DAC’s output
spectrum
(SFDR)
Spurious Free Dynamic
Range
The ratio expressed in dB of the RMS signal amplitude to the RMS value of the
next highest spectral component (peak spurious spectral component) measured
in the frequency band DC to Fclk/2. SFDR is the key parameter for selecting a
converter to be used in a frequency domain application. It may be reported in dBc
(degrades as signal levels are lowered) or in dBFS (always full-scale when related
back to the converter)
(SINAD)
Signal-to-Noise and
Distortion Ratio
The ratio expressed in dB of the RMS signal amplitude to the RMS sum of all
other spectral components, including the harmonics except DC
(SNR)
Signal-to-noise Ratio
The ratio expressed in dB of the RMS signal amplitude to the RMS sum of all
other spectral components excluding the first five harmonics
(THD)
Total Harmonic Distortion
The ratio expressed in dBc of the RMS sum of the first 10 harmonic components,
to the RMS value of the measured fundamental spectral component
TDSP
The time delay between the rising edge of the CW_IN master clock and the active
DSP clock rising edge for a clock shift of 0000
THold
Hold Time
The time difference between the rising edge of the differential Data Ready input
(zero crossing) and a point of change of the digital input data (zero crossing of
differential input)