DAC081C081_08 Datasheet, PDF (9/24 Pages) National Semiconductor (TI) – 8-Bit Micro Power Digital-to-Analog Converter with an I2C-Compatible Interface

Note 6: Reflow temperature profiles are different for lead-free packages.
Note 7: The inputs are protected as shown below. Input voltage magnitudes up to 5.5V, regardless of V_A, will not cause errors in the conversion result. For
example, if V_A is 3V, the digital input pins can be driven with a 5V logic device.
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Note 8: To guarantee accuracy, it is required that V_A and V_REF be well bypassed.
Note 9: Typical figures are at T_J = 25°C, and represent most likely parametric norms. Test limits are guaranteed to National's AOQL (Average Outgoing Quality
Level).
Note 10: This parameter is guaranteed by design and/or characterization and is not tested in production.
Note 11: Spike suppression filtering on SCL and SDA will supress spikes that are less than 50ns for standard-fast mode and less than 10ns for hs-mode.
Note 12: Applies to the Multiplying DAC configuration. In this configuration, the reference is used as the analog input. The value loaded in the DAC Register will
digitally attenuate the signal at Vout.
Note 13: C_b refers to the capacitance of one bus line. C_b is expressed in pF units.
Specification Definitions
DIFFERENTIAL NON-LINEARITY (DNL) is the measure of
the maximum deviation from the ideal step size of 1 LSB,
which is V_REF / 256 = V_A / 256.
DIGITAL FEEDTHROUGH is a measure of the energy inject-
ed 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 V_A x 255 / 256.
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.
GLITCH IMPULSE is the energy injected into the analog out-
put 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 de-
viation 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 Tables.
LEAST SIGNIFICANT BIT (LSB) is the bit that has the small-
est value or weight of all bits in a word. This value is
LSB = V_REF / 2ⁿ
where V_REF is the supply voltage for this product, and "n" is
the DAC resolution in bits, which is 8 for the DAC081C081.
MAXIMUM LOAD CAPACITANCE is the maximum capaci-
tance 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 V_A.
MULTIPLYING BANDWIDTH is the frequency at which the
output amplitude falls 3dB below the input sine wave on
V_REFIN 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 cur-
rents 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 V_REFIN. 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.
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