DAC5311-Q1 Datasheet, PDF (33/38 Pages) Texas Instruments – 1.8 V to 5.5 V, 80 mA, 8 BIT, LOW POWER, SINGLE CHANNEL, DIGITAL-TO-ANALOG CONVERTER

DAC5311-Q1
www.ti.com ...................................................................................................................................................................................................... SBAS470 – JUNE 2009
Digital Feed Through
Digital feed through is defined as impulse seen at the output of the DAC from the digital inputs of the DAC. It is
measured when the DAC output is not updated. It is specified in nV-s, and measured with a full-scale code
change on the data bus; that is, from all '0's to all '1's and vice versa.
Channel-to-Channel DC Crosstalk
Channel-to-channel dc crosstalk is defined as the dc change in the output level of one DAC channel in response
to a change in the output of another DAC channel. It is measured with a full-scale output change on one DAC
channel while monitoring another DAC channel remains at midscale. It is expressed in LSB.
Channel-to-Channel AC Crosstalk
AC crosstalk in a multi-channel DAC is defined as the amount of ac interference experienced on the output of a
channel at a frequency (f) (and its harmonics), when the output of an adjacent channel changes its value at the
rate of frequency (f). It is measured with one channel output oscillating with a sine wave of 1-kHz frequency,
while monitoring the amplitude of 1-kHz harmonics on an adjacent DAC channel output (kept at zero scale). It is
expressed in dB.
Signal-to-Noise Ratio (SNR)
Signal-to-noise ratio (SNR) is defined as the ratio of the root mean-squared (RMS) value of the output signal
divided by the RMS values of the sum of all other spectral components below one-half the output frequency, not
including harmonics or dc. SNR is measured in dB.
Total Harmonic Distortion (THD)
Total harmonic distortion + noise is defined as the ratio of the RMS values of the harmonics and noise to the
value of the fundamental frequency. It is expressed in a percentage of the fundamental frequency amplitude at
sampling rate f_S.
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 (dBc).
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.
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 midscale 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 midscale while filtering the output voltage within a
band of 0.1 Hz to 10 Hz 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 – 1.
Copyright © 2009, Texas Instruments Incorporated
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