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AD7294 데이터시트(PDF) 10 Page - Analog Devices

부품명 AD7294
상세설명  12-Bit, Multichannel, DAC/ADC Temperature Sensor and Current Sense for Monitor and Control Applications
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AD7294
Preliminary Technical Data
Rev. PrB | Page 10 of 45
TERMINOLOGY
Integral Nonlinearity
The maximum deviation from a straight line passing through
the endpoints of the ADC/DAC transfer function. The
endpoints are zero scale, a point 1 LSB. below the first code
transition, and full scale, a point 1 LSB above the last code
transition.
Differential Nonlinearity
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.
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 the full-scale range.
Gain Error Match
The difference in gain error between any two channels.
Zero-Code Error
Zero-code error is a measure of the output error when zero
code (0x000) is loaded into the DAC register. Ideally, the output
should be 0 V. Zero-code error is due to a combination of the
offset errors in the DAC and output amplifier. Zero-code error
is expressed in mV.
Full-Scale Error
Full-scale error is a measure of the output error when full-scale
code (0xFFFF) is loaded into the DAC register. Ideally, the output
should be VDD − 1 LSB. Full-scale error is expressed in mV.
Zero-Code Error Drift
Zero-code error drift is a measure of the change in zero-code
error with a change in temperature. It is expressed in µV/°C.
Gain Error Drift
Gain error drift is a measure of the change in gain error with
changes in temperature. It is expressed in (ppm of full-scale
range)/°C.
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 (0x2000 to 0x1FFF).
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—from all 0s to all 1s or vice versa.
Channel-to-Channel Isolation
A measure of the level of crosstalk between channels, taken
by applying a full-scale sine wave signal to the unselected input
channels and determining how much of the 108 Hz signal is
attenuated in the selected channel. The sine wave signal applied
to the unselected channels is then varied from 1 kHz up to 2 MHz,
and each time it is determined how much of the 108 Hz signal
in the selected channel is attenuated. This figure represents the
worst-case level across all channels.
Aperture Delay
The measured interval between the sampling clock’s leading
edge and the point at which the ADC takes the sample.
Aperture Jitter
The sample-to-sample variation in the effective point in time at
which the sample is taken.
Offset Error
The deviation of the first code transition (00 … 000) to
(00 … 001) from the ideal—that is, AGND + 1 LSB.
Offset Error Match
The difference in offset error between any two channels.


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