AD5667 Analog Devices, AD5667 Datasheet - Page 18

• Manufacturer Part Number: AD5667
• Manufacturer: Analog Devices

Specifications of AD5667

• Resolution (bits): 16bit
• Dac Update Rate: 250kSPS
• Dac Settling Time: 4µs
• Max Pos Supply (v): +5.5V
• Single-supply: Yes
• Dac Type: Voltage Out
• Dac Input Format: I2C/Ser 2-wire,Ser

AD5627R/AD5647R/AD5667R, AD5627/AD5667
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 AD5667R because the output of the DAC cannot go below
0 V due to a combination of the offset errors in the DAC and
the output amplifier. Zero-code error is expressed in 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
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 in % of 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 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 ppm
of FSR/°C.
Offset Error
Offset error is a measure of the difference between V
and V
transfer function. Offset error is measured on the AD5667R
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 dB. V
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 is measured from the rising edge of
the stop condition.
OUT
to a change in V
OUT
(ideal) expressed in mV in the linear region of the
REF
DD
DD
is held at 2 V and V
− 1 LSB. Full-scale error is expressed in %
for full-scale output of the DAC. It is
DD
is varied by ±10%.
OUT
(actual)
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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 42).
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 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 dB.
Output Noise Spectral Density
Output noise spectral density is a measurement of the internally
generated random noise. Random noise is characterized as a
spectral density. It is measured by loading the DAC to midscale
and measuring noise at the output. It is measured in nV/√Hz. A
plot of noise spectral density can be seen in Figure 48.
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 μV.
DC crosstalk due to load current change is a measure of the
impact that a change in load current on one DAC has to
another DAC kept at midscale. It is expressed in μV/mA.
Digital Crosstalk
Digital crosstalk 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 nV-s.