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Spurious-Free Dynamic Range (SFDR)

DAC Output Noise Density

DAC Output Noise

Signal-to-Noise plus Distortion (SINAD)

Full-Scale Range (FSR)

DAC8564

SBAS403A – JUNE 2007 – REVISED NOVEMBER 2007

Spurious-free dynamic range (SFDR) is the usable

Output

noise

density

defined

dynamic range of a DAC before spurious noise

internally-generated random noise. Random noise is

interferes or distorts the fundamental signal. SFDR is

characterized as a spectral density (nV/

√Hz). It is

the measure of the difference in amplitude between

measured by loading the DAC to mid-scale and

the fundamental and the largest harmonically or

measuring noise at the output.

non-harmonically related spur from dc to the full

Nyquist bandwidth (half the DAC sampling rate, or

fS/2). A spur is any frequency bin on a spectrum

DAC output noise is defined as any voltage deviation

analyzer, or from a Fourier transform, of the analog

of DAC output from the desired value (within a

output of the DAC. SFDR is specified in decibels

particular frequency band). It is measured with a DAC

relative to the carrier (dBc).

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

SINAD includes all the harmonic and outstanding

terms of peak-to-peak voltage (Vpp).

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

Full-scale range (FSR) is the difference between the

input frequency and sampling rate, fS.

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.

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