AD5304/AD5314/AD5324
TERMINOLOGY
DIGITAL CROSSTALK
RELATIVE ACCURACY
This is the glitch impulse transferred to the output of one DAC
at midscale in response to a full-scale code change (all 0s to all
1s and vice versa) in the input register of another DAC. It is
expressed in nV-secs.
For the DAC, relative accuracy or integral nonlinearity (INL) is
a measure of the maximum deviation, in LSBs, from a straight
line passing through the endpoints of the DAC transfer function.
Typical INL versus Code plots can be seen in Figures 4, 5, and 6.
DAC-TO-DAC CROSSTALK
DIFFERENTIAL NONLINEARITY
This is the glitch impulse transferred to the output of one DAC
due to a digital code change and subsequent output change of
another DAC. This includes both digital and analog crosstalk. It
is measured by loading one of the DACs with a full-scale code
change (all 0s to all 1s and vice versa) with the LDAC bit set low
and monitoring the output of another DAC. The energy of the
glitch is expressed in nV-secs.
Differential Nonlinearity (DNL) is the difference between the
measured change and the ideal 1 LSB change between any two
adjacent codes. A specified differential nonlinearity of 1 LSB
maximum ensures monotonicity. This DAC is guaranteed mono-
tonic by design. Typical DNL versus Code plots can be seen in
Figures 7, 8, and 9.
OFFSET ERROR
MULTIPLYING BANDWIDTH
This is a measure of the offset error of the DAC and the output
amplifier. It is expressed as a percentage of the full-scale range.
The amplifiers within the DAC have a finite bandwidth. The
multiplying bandwidth is a measure of this. A sine wave on the
reference (with full-scale code loaded to the DAC) appears on
the output. The multiplying bandwidth is the frequency at which
the output amplitude falls to 3 dB below the input.
GAIN ERROR
This is a measure of the span error of the DAC. It is the devia-
tion in slope of the actual DAC transfer characteristic from the
ideal expressed as a percentage of the full-scale range.
TOTAL HARMONIC DISTORTION
This is the difference between an ideal sine wave and its attenuated
version using the DAC. The sine wave is used as the reference
for the DAC and the THD is a measure of the harmonics present
on the DAC output. It is measured in dBs.
OFFSET ERROR DRIFT
This is a measure of the change in offset error with changes in
temperature. It is expressed in (ppm of full-scale range)/°C.
GAIN ERROR
PLUS
GAIN ERROR DRIFT
This is a measure of the change in gain error with changes in
temperature. It is expressed in (ppm of full-scale range)/°C.
OUTPUT
VOLTAGE
IDEAL
OFFSET ERROR
ACTUAL
POWER-SUPPLY REJECTION RATIO (PSRR)
This indicates how the output of the DAC is affected by changes
in the supply voltage. PSRR is the ratio of the change in VOUT to
a change in VDD for full-scale output of the DAC. It is measured
in dBs. VREF is held at 2 V and VDD is varied 10%.
NEGATIVE
OFFSET
ERROR
DAC CODE
DEADBAND CODES
DC CROSSTALK
AMPLIFIER
FOOTROOM
(1mV)
This is the dc change in the output level of one DAC at midscale
in response to a full-scale code change (all 0s to all 1s and vice
versa) and output change of another DAC. It is expressed in µV.
NEGATIVE
OFFSET
ERROR
REFERENCE FEEDTHROUGH
This is the ratio of the amplitude of the signal at the DAC
output to the reference input when the DAC output is not being
updated. It is expressed in dBs.
Figure 2. Transfer Function with Negative Offset
MAJOR-CODE TRANSITION GLITCH ENERGY
Major-code transition glitch energy is the energy of the impulse
injected into the analog output when the code in the DAC
register changes state. It is normally specified as the area of the
glitch in nV-secs and is measured when the digital code is changed
by 1 LSB at the major carry transition (011 . . . 11 to 100 . . . 00
or 100 . . . 00 to 011 . . . 11).
GAIN ERROR
PLUS
OFFSET ERROR
ACTUAL
OUTPUT
VOLTAGE
IDEAL
DIGITAL FEEDTHROUGH
POSITIVE
OFFSET
Digital feedthrough is a measure of the impulse injected into the
analog output of the DAC from the digital input pins of the device
when the DAC output is not being written to (SYNC held high). It
is specified in nV-secs and is measured with a worst-case change on
the digital input pins, e.g., from all 0s to all 1s or vice versa.
DAC CODE
Figure 3. Transfer Function with Positive Offset
REV. B
–5–
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