AD5405YCP-REEL7 Analog Devices, AD5405YCP-REEL7 Datasheet - Page 13

• Manufacturer Part Number: AD5405YCP-REEL7
• Description: Dual 12-Bit/ High Bandwidth/ Multiplying DAC with 4-Quadrant Resistors and Parallel Interface
• Manufacturer: Analog Devices

TERMINOLOGY
Relative Accuracy
Relative accuracy or endpoint nonlinearity is a measure of the
maximum deviation from a straight line passing through the
endpoints of the DAC transfer function. It is measured after
adjusting for zero and full scale and is normally expressed in
LSBs or as a percentage of full-scale reading.
Differential Nonlinearity
Differential nonlinearity 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 max over
the operating temperature range ensures monotonicity.
Gain Error
Gain error or full-scale error is a measure of the output error
between an ideal DAC and the actual device output. For this
DAC, ideal maximum output is V
DACs is adjustable to zero with external resistance.
Output Leakage Current
Output leakage current is current that flows in the DAC ladder
switches when these are turned off. For the I
be measured by loading all 0s to the DAC and measuring the
I
the DAC is loaded with all 1s.
Output Capacitance
Capacitance from I
Output Current Settling Time
This is the amount of time it takes for the output to settle to a
specified level for a full-scale input change. For this device, it is
specified with a 100 Ω resistor to ground.
Digital to Analog Glitch lmpulse
The amount of charge injected from the digital inputs to the
analog output when the inputs change state. This is typically
specified as the area of the glitch in either pA-secs or nV-secs
depending upon whether the glitch is measured as a current or
voltage signal.
Digital Feedthrough
When the device is not selected, high frequency logic activity on
the device’ s digital inputs is capacitively coupled through the
device to show up as noise on the I
into the following circuitry. This noise is digital feedthrough.
OUT
1 current. Minimum current flows in the I
OUT
1 or I
OUT
2 to AGND.
REF
OUT
− 1 LSB. Gain error of the
pins and subsequently
OUT
OUT
1 terminal, it can
2 line when
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Multiplying Feedthrough Error
This is the error due to capacitive feedthrough from the DAC
reference input to the DAC I
loaded to the DAC.
Digital Crosstalk
This is the glitch impulse transferred to the outputs of one
DAC in response to a full-scale code change (all 0s to all 1s,
and vice versa) in the input register of the other DAC. It is
expressed in nV-s.
Analog Crosstalk
This is the glitch impulse transferred to the output of one DAC
due to a change in the output of another DAC. It is measured by
loading one of the input registers with a full-scale code change
(all 0s to all 1s, and vice versa), while keeping LDAC high. Then
pulse LDAC low and monitor the output of the DAC whose
digital code was not changed. The area of the glitch is expressed
in nV-s.
Channel to Channel Isolation
This refers to the proportion of input signal from one DAC’s
reference input which appears at the output of the other DAC,
and is expressed in dBs.
Total Harmonic Distortion (THD)
The DAC is driven by an ac reference. The ratio of the rms sum
of the harmonics of the DAC output to the fundamental value is
the THD. Usually only the lower-order harmonics are included,
such as the second to the fifth.
Intermodulation Distortion
The DAC is driven by two combined sine wave references
of frequencies fa and fb. Distortion products are produced
at sum and difference frequencies of mfa ± nfb where m, n = 0,
1, 2, 3,... Intermodulation terms are those for which m or n is
not equal to zero. The second-order terms include (fa + fb)
and (fa − fb) and the third-order terms are (2fa + fb), (2fa − fb),
(f + 2fa + 2fb) and (fa − 2fb). IMD is defined as
Compliance Voltage Range
The maximum range of (output) terminal voltage for which the
device provides the specified characteristics.
IMD
THD
=
20
=
20
log
log
(
rms
(
V
sum
2
rms
2
+
of
V
amplitude
3
the
2
OUT
V
+
1
sum
V
1 terminal, when all 0s are
4
2
+
and
of
V
5
the
2
diff
)
fundamenta
distortion
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