AD5625R Analog Devices, AD5625R Datasheet - Page 20

• Manufacturer Part Number: AD5625R
• Manufacturer: Analog Devices

Specifications of AD5625R

• Resolution (bits): 12bit
• Dac Update Rate: 333kSPS
• Dac Settling Time: 3µs
• Max Pos Supply (v): +5.5V
• Single-supply: Yes
• Dac Type: Voltage Out
• Dac Input Format: I2C/Ser 2-wire,Ser

AD5625R/AD5645R/AD5665R, AD5625/AD5665
TERMINOLOGY
Relative Accuracy or Integral Nonlinearity (INL)
For the DAC, relative accuracy or integral nonlinearity is a
measurement of the maximum deviation, in LSBs, from a
straight line passing through the endpoints of the DAC
transfer function.
Differential Nonlinearity (DNL)
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 maximum
ensures monotonicity. This DAC is guaranteed monotonic
by design.
Zero-Code Error
Zero-code error is a measurement of the output error when zero
scale (0x0000) is loaded to the DAC register. Ideally, the output
should be 0 V. The zero-code error is always positive in the
AD5665R because the output of the DAC cannot go below 0 V
due to a combination of the offset errors in the DAC and the out-
put amplifier. Zero-code error is expressed in millivolts (mV).
Full-Scale Error
Full-scale error is a measurement of the output error when full-
scale code (0xFFFF) is loaded to the DAC register. Ideally, the
output should be V
percentage of full-scale range (FSR).
Gain Error
Gain error is a measure of the span error of the DAC. It is the
deviation in slope of the DAC transfer characteristic from ideal
expressed as a percentage of full-scale range (FSR).
Zero-Code Error Drift
Zero-code error drift is a measurement of the change in
zero-code error with a change in temperature. It is expressed in
microvolts per degrees Celsius (μV/°C).
Gain Temperature Coefficient
Gain temperature coefficient is a measurement of the change in
gain error with changes in temperature. It is expressed in parts
per million (ppm) of full-scale range per degrees Celsius
(FSR/°C).
Offset Error
Offset error is a measure of the difference between V
and V
transfer function. Offset error is measured on the AD5665R
with Code 512 loaded in the DAC register. It can be negative or
positive.
DC Power Supply Rejection Ratio (PSRR)
DC PSRR indicates how the output of the DAC is affected by
changes in the supply voltage. PSRR is the ratio of the change in
V
measured in decibels (dB). V
by ±10%.
OUT
to the change in V
OUT
(ideal) expressed in mV in the linear region of the
DD
− 1 LSB. Full-scale error is expressed as a
DD
for full-scale output of the DAC. It is
REF
is held at 2 V, and V
DD
OUT
is varied
(actual)
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Output Voltage Settling Time
Output voltage settling time is the amount of time it takes for
the output of a DAC to settle to a specified level for a ¼ to ¾
full-scale input change, and it is measured from the rising edge
of the stop condition.
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 nV-s
and is measured when the digital input code is changed by
1 LSB at the major carry transition (0x7FFF to 0x8000) (see
Figure 44).
Digital Feedthrough
Digital feedthrough is a measure of the impulse injected into the
analog output of the DAC from the digital inputs of the DAC
but is measured when the DAC output is not updated. It is
specified in nV-s and is measured with a full-scale code change
on the data bus, that is, from all 0s to all 1s and vice versa.
Reference Feedthrough
Reference feedthrough 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 decibels (dB).
Output Noise Spectral Density
Output noise spectral density is a measurement of the internally
generated random noise, which is characterized as a spectral
density (nanovolts per square root of hertz frequency (nV/√Hz)).
It is measured by loading the DAC to midscale and measuring
noise at the output. It is measured in nanovolts per square root
of hertz frequency (nV/√Hz). A plot of noise spectral density is
shown in Figure 50.
DC Crosstalk
DC crosstalk is the dc change in the output level of one DAC
in response to a change in the output of another DAC. It is
measured with a full-scale output change on one DAC (or soft
power-down and power-up) while monitoring another DAC
kept at midscale. It is expressed in microvolts (μV).
DC crosstalk due to load current change is a measure of the
impact that a change in load current on one DAC has on
another DAC kept at midscale. It is expressed in microvolts per
milliampere (μV/mA).
Digital Crosstalk
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
measured in standalone mode and is expressed in nanovolts per
second (nV-s).