DAC121S101QCMKX/NOPB National Semiconductor, DAC121S101QCMKX/NOPB Datasheet - Page 17

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DAC121S101QCMKX/NOPB

Manufacturer Part Number
DAC121S101QCMKX/NOPB
Description
IC DAC 12BIT SER 6TSOT
Manufacturer
National Semiconductor
Series
PowerWise®r
Datasheet

Specifications of DAC121S101QCMKX/NOPB

Settling Time
12µs
Number Of Bits
12
Data Interface
DSP, MICROWIRE™, QSPI™, Serial, SPI™
Number Of Converters
1
Voltage Supply Source
Single Supply
Power Dissipation (max)
1.72mW
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
TSOT-23-6, TSOT-6
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
DAC121S101QCMKX
Like any low dropout regulator, the LP2980 requires an output
capacitor for loop stability. This output capacitor must be at
least 1.0µF over temperature, but values of 2.2µF or more will
provide even better performance. The ESR of this capacitor
should be within the range specified in the LP2980 data sheet.
Surface-mount solid tantalum capacitors offer a good combi-
nation of small size and ESR. Ceramic capacitors are attrac-
tive due to their small size but generally have ESR values that
are too low for use with the LP2980. Aluminum electrolytic
capacitors are typically not a good choice due to their large
FIGURE 11. Using the LP3985 regulator
FIGURE 12. Using the LP2980 regulator
FIGURE 13. Bipolar Operation
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17
An input capacitance of 1.0µF without any ESR requirement
is required at the LP3985 input, while a 1.0µF ceramic ca-
pacitor with an ESR requirement of 5mΩ to 500mΩ is required
at the output. Careful interpretation and understanding of the
capacitor specification is required to ensure correct device
operation.
2.2.4 LP2980
The LP2980 is an ultra low dropout regulator with a 0.5% or
1.0% accuracy over temperature, depending upon grade. It is
available in 3.0V, 3.3V and 5V versions, among others.
size and have ESR values that may be too high at low tem-
peratures.
2.3 BIPOLAR OPERATION
The DAC121S101 is designed for single supply operation and
thus has a unipolar output. However, a bipolar output may be
obtained with the circuit in
an output voltage range of ±5 Volts. A rail-to-rail amplifier
should be used if the amplifier supplies are limited to ±5V.
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Figure
13. This circuit will provide
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