资料介绍
Differential Nonlinearity: Ideally, any two adjacent digital
codes correspond to output analog voltages that are exactly
one LSB apart. Differential non-linearity is a measure of the
worst case deviation from the ideal 1 LSB step. For example,
a DAC with a 1.5 LSB output change for a 1 LSB digital code
change exhibits 1⁄2 LSB differential non-linearity. Differential
non-linearity may be expressed in fractional bits or as a percentage
of full scale. A differential non-linearity greater than
1 LSB will lead to a non-monotonic transfer function in a
DAC.
Gain Error (Full Scale Error): The difference between the
output voltage (or current) with full scale input code and the
ideal voltage (or current) that should exist with a full scale input
code.
Gain Temperature Coefficient (Full Scale Temperature
Coefficient): Change in gain error divided by change in temperature.
Usually expressed in parts per million per degree
Celsius (ppm/°C).
Integral Nonlinearity (Linearity Error): Worst case deviation
from the line between the endpoints (zero and full scale).
Can be expressed as a percentage of full scale or in fraction
of an LSB.
LSB (Lease-Significant Bit): In a binary coded system this
is the bit that carries the smallest value or weight. Its value is
the full scale voltage (or current) divided by 2n, where n is the
resolution of the converter.
Monotonicity: A monotonic function has a slope whose sign
does not change. A monotonic DAC has an output that
changes in the same direction (or remains constant) for each
increase in the input code. the converse is true for decreasing codes.
codes correspond to output analog voltages that are exactly
one LSB apart. Differential non-linearity is a measure of the
worst case deviation from the ideal 1 LSB step. For example,
a DAC with a 1.5 LSB output change for a 1 LSB digital code
change exhibits 1⁄2 LSB differential non-linearity. Differential
non-linearity may be expressed in fractional bits or as a percentage
of full scale. A differential non-linearity greater than
1 LSB will lead to a non-monotonic transfer function in a
DAC.
Gain Error (Full Scale Error): The difference between the
output voltage (or current) with full scale input code and the
ideal voltage (or current) that should exist with a full scale input
code.
Gain Temperature Coefficient (Full Scale Temperature
Coefficient): Change in gain error divided by change in temperature.
Usually expressed in parts per million per degree
Celsius (ppm/°C).
Integral Nonlinearity (Linearity Error): Worst case deviation
from the line between the endpoints (zero and full scale).
Can be expressed as a percentage of full scale or in fraction
of an LSB.
LSB (Lease-Significant Bit): In a binary coded system this
is the bit that carries the smallest value or weight. Its value is
the full scale voltage (or current) divided by 2n, where n is the
resolution of the converter.
Monotonicity: A monotonic function has a slope whose sign
does not change. A monotonic DAC has an output that
changes in the same direction (or remains constant) for each
increase in the input code. the converse is true for decreasing codes.
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