DAC8565 Datasheet, PDF (41/46 Pages) Texas Instruments – 16-Bit, Quad Channel, Ultra-Low Glitch, Voltage Output DIGITAL-TO-ANALOG CONVERTER with 2.5V, 2ppm/°C Internal Reference

DAC8565
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Spurious-Free Dynamic Range (SFDR)
Spurious-free dynamic range (SFDR) is the usable
dynamic range of a DAC before spurious noise
interferes or distorts the fundamental signal. SFDR is
the measure of the difference in amplitude between
the fundamental and the largest harmonically or
non-harmonically related spur from dc to the full
Nyquist bandwidth (half the DAC sampling rate, or
f_S/2). A spur is any frequency bin on a spectrum
analyzer, or from a Fourier transform, of the analog
output of the DAC. SFDR is specified in decibels
relative to the carrier (dB_c).
Signal-to-Noise plus Distortion (SINAD)
SINAD includes all the harmonic and outstanding
spurious components in the definition of output noise
power in addition to quantizing any internal random
noise power. SINAD is expressed in dB at a specified
input frequency and sampling rate, f_S.
SBAS411A – JUNE 2007 – REVISED NOVEMBER 2007
DAC Output Noise Density
Output noise density is defined as
internally-generated random noise. Random noise is
characterized as a spectral density (nV/√Hz). It is
measured by loading the DAC to mid-scale and
measuring noise at the output.
DAC Output Noise
DAC output noise is defined as any voltage deviation
of DAC output from the desired value (within a
particular frequency band). It is measured with a DAC
channel kept at mid-scale while filtering the output
voltage within a band of 0.1Hz to 10Hz and
measuring its amplitude peaks. It is expressed in
terms of peak-to-peak voltage (V_pp).
Full-Scale Range (FSR)
Full-scale range (FSR) is the difference between the
maximum and minimum analog output values that the
DAC is specified to provide; typically, the maximum
and minimum values are also specified. For an n-bit
DAC, these values are usually given as the values
matching with code 0 and 2ⁿ.
Copyright © 2007, Texas Instruments Incorporated
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