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DAC101C081Q Arkusz danych(PDF) 10 Page - Texas Instruments

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Numer części DAC101C081Q
Szczegółowy opis  DAC101C081/DAC101C081Q/DAC101C085 10-Bit Micro Power Digital-to-Analog Converter with an I2C??Compatible Interface
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Strona internetowa  http://www.ti.com
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DAC101C081, DAC101C081Q, DAC101C085
SNVS801A – APRIL 2012 – REVISED MARCH 2013
www.ti.com
Specification Definitions
DIFFERENTIAL NON-LINEARITY (DNL) is the measure of the maximum deviation from the ideal step size of 1
LSB, which is VREF / 1024 = VA / 1024.
DIGITAL FEEDTHROUGH is a measure of the energy injected into the analog output of the DAC from the digital
inputs when the DAC output is not updated. It is measured with a full-scale code change on the data bus.
FULL-SCALE ERROR is the difference between the actual output voltage with a full scale code (FFFh) loaded
into the DAC and the value of VA x 1023 / 1024.
GAIN ERROR is the deviation from the ideal slope of the transfer function. It can be calculated from Zero and
Full-Scale Errors as:
GE = FSE - ZE
where
GE is Gain error
FSE is Full-Scale Error
and ZE is Zero Error.
(1)
GLITCH IMPULSE is the energy injected into the analog output when the input code to the DAC register
changes. It is specified as the area of the glitch in nanovolt-seconds.
INTEGRAL NON-LINEARITY (INL) is a measure of the deviation of each individual code from a straight line
through the input to output transfer function. The deviation of any given code from this straight line is measured
from the center of that code value. The end point method is used. INL for this product is specified over a limited
range, per the Electrical Characteristics Table.
LEAST SIGNIFICANT BIT (LSB) is the bit that has the smallest value or weight of all bits in a word. This value is
LSB = VREF / 2
n
where
VREF is the supply voltage for this product, and "n" is the DAC resolution in bits, which is 10 for the
DAC101C081.
(2)
MAXIMUM LOAD CAPACITANCE is the maximum capacitance that can be driven by the DAC with output
stability maintained.
MONOTONICITY is the condition of being monotonic, where the DAC has an output that never decreases when
the input code increases.
MOST SIGNIFICANT BIT (MSB) is the bit that has the largest value or weight of all bits in a word. Its value is
1/2 of VA.
MULTIPLYING BANDWIDTH is the frequency at which the output amplitude falls 3dB below the input sine wave
on VREFIN with a full-scale code loaded into the DAC.
POWER EFFICIENCY is the ratio of the output current to the total supply current. The output current comes from
the power supply. The difference between the supply and output currents is the power consumed by the device
without a load.
SETTLING TIME is the time for the output to settle to within 1/2 LSB of the final value after the input code is
updated.
TOTAL HARMONIC DISTORTION (THD) is the measure of the harmonics present at the output of the DACs
with an ideal sine wave applied to VREFIN. THD is measured in dB.
WAKE-UP TIME is the time for the output to exit power-down mode. This time is measured from the rising edge
of SCL during the ACK bit of the lower data byte to the time the output voltage deviates from the power-down
voltage of 0V.
ZERO CODE ERROR is the output error, or voltage, present at the DAC output after a code of 000h has been
entered.
10
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Copyright © 2012–2013, Texas Instruments Incorporated
Product Folder Links: DAC101C081 DAC101C081Q DAC101C085


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