DAC104S085EB/NOPB

Manufacturer Part NumberDAC104S085EB/NOPB
DescriptionBOARD EVALUATION DAC104S085
ManufacturerNational Semiconductor
SeriesPowerWise®
DAC104S085EB/NOPB datasheets
 


Specifications of DAC104S085EB/NOPB

Number Of Dac's4Number Of Bits10
Outputs And Type4, Single EndedData InterfaceSerial
Settling Time4.5µsDac TypeVoltage
Voltage Supply SourceSingleOperating Temperature-40°C ~ 105°C
Utilized Ic / PartDAC104S085Lead Free Status / RoHS StatusLead free / RoHS Compliant
Other namesDAC104S085EB  
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2.1.2 LM4050
Available with accuracy of 0.44%, the LM4050 shunt refer-
ence is also a good choice as a reference for the
DAC104S085. It is available in 4.096V and 5V versions and
comes in a space-saving 3-pin SOT23.
FIGURE 6. The LM4050 as a power supply
The minimum resistor value in the circuit of Figure 6 must be
chosen such that the maximum current through the LM4050
does not exceed its 15 mA rating. The conditions for maxi-
mum current include the input voltage at its maximum, the
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FIGURE 5. The LM4130 as a power supply
LM4050 voltage at its minimum, and the DAC104S085 draw-
ing zero current. The maximum resistor value must allow the
LM4050 to draw more than its minimum current for regulation
plus the maximum DAC104S085 current in full operation. The
conditions for minimum current include the input voltage at its
minimum, the LM4050 voltage at its maximum, the resistor
value at its maximum due to tolerance, and the DAC104S085
draws its maximum current. These conditions can be sum-
marized as
R(min) = ( V
and
R(max) = ( V
where V
(min) and V
Z
voltages ± the LM4050 output tolerance over temperature, I
(max) is the maximum allowable current through the LM4050,
I
(min) is the minimum current required by the LM4050 for
Z
proper
regulation,
DAC104S085 supply current.
2.1.3 LP3985
The LP3985 is a low noise, ultra low dropout voltage regulator
with a 3% accuracy over temperature. It is a good choice for
applications that do not require a precision reference for the
20195314
DAC104S085. It comes in 3.0V, 3.3V and 5V versions, among
others, and sports a low 30 µV noise specification at low fre-
quencies. Since low frequency noise is relatively difficult to
filter, this specification could be important for some applica-
tions. The LP3985 comes in a space-saving 5-pin SOT23 and
5-bump micro SMD packages.
FIGURE 7. Using the LP3985 regulator
16
20195313
(max) − V
(min) ) /I
(max)
IN
Z
Z
(min) − V
(max) ) / ( (I
(max) + I
(min) )
IN
Z
DAC
Z
(max) are the nominal LM4050 output
Z
and
I
(max)
is
the
maximum
DAC
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Z