DAC8562SDSCT Datasheet, PDF (46/58 Pages) Texas Instruments – DUAL 16-/14-/12-BIT, ULTRALOW-GLITCH, LOW-POWER, BUFFERED, VOLTAGE-OUTPUT DAC WITH 2.5-V, 4-PPM/°C INTERNAL REFERENCE IN SMALL 3-MM × 3-MM SON

DAC8562, DAC8563
DAC8162, DAC8163
DAC7562, DAC7563
SLAS719D – AUGUST 2010 – REVISED AUGUST 2012
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DYNAMIC PERFORMANCE
Dynamic performance parameters are specifications such as settling time or slew rate, which are important in
applications where the signal rapidly changes and/or high frequency signals are present.
Channel-to-Channel Crosstalk
Crosstalk in a multi-channel DAC is defined as a glitch coupled onto the output of a channel (victim) when the
output of an adjacent channel (agressor) has a full-scale transition. It is calculated as the total area under the
measured glitch on the victim channel at mid-scale code. It is expressed in nV-s.
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 at mid-scale. It is expressed in LSB.
Code Change/Digital-to-Analog Glitch Impulse
Digital-to-analog glitch impulse is the impulse injected into the analog output when the input code in the DAC
register changes state. It is normally specified as the area of the glitch in nanovolt-seconds (nV-s), and is
measured when the digital input code is changed by 1 LSB at the major carry transition.
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 0.1 Hz to 10 Hz and measuring its amplitude peaks. It is expressed in terms of peak-to-peak voltage
(V_PP).
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 setting the DAC to mid-scale and measuring noise at the output.
Digital Feedthrough
Digital feedthrough is defined as the 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 0s to all 1s and vice versa.
Output Voltage Settling Time
Settling time is the total time (including slew time) for the DAC output to settle within an error band around its
final value after a change in input. Settling times are specified to within ±0.024% FSR (or whatever value is
stated) of full-scale range.
Slew Rate
The output slew rate (SR) of an amplifier or other electronic circuit is defined as the maximum rate of change of
the output voltage for all possible input signals.
SR = max ^DVOUT(t)
Dt
(7)
Where ΔV_OUT(t) is the output produced by the amplifier as a function of time t.
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