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PDF ( 数据手册 , 数据表 ) DAC102S085

零件编号 DAC102S085
描述 10-Bit Micro Power DUAL Digital-to-Analog Converter with Rail-to-Rail Output
制造商 National Semiconductor
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DAC102S085 数据手册, 描述, 功能
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June 2006
DAC102S085
10-Bit Micro Power DUAL Digital-to-Analog Converter
with Rail-to-Rail Output
General Description
Features
The DAC102S085 is a full-featured, general purpose DUAL n Guaranteed Monotonicity
10-bit voltage-output digital-to-analog converter (DAC) that n Low Power Operation
can operate from a single +2.7V to 5.5V supply and uses
210 µA at 3V and 320 µA at 5V. The DAC102S085 is
packaged in a 10-lead MSOP package. The on-chip output
amplifier allows rail-to-rail output swing and the three wire
serial interface operates at clock rates up to 40 MHz over the
entire supply voltage range. Competitive devices are limited
n Rail-to-Rail Voltage Output
n Power-on Reset to 0V
n Simultaneous Output Updating
n Wide power supply range (+2.7V to +5.5V)
n Power Down Modes
to 25 MHz clock rates at supply voltages in the 2.7V to 3.6V
range. The serial interface is compatible with standard
Key Specifications
SPI, QSPI, MICROWIRE and DSP interfaces.
n Resolution
10 bits
The reference for the DAC102S085 serves both channels n INL
±2 LSB (max)
and can vary in voltage between 1V and VA, providing the
widest possible output dynamic range. The DAC102S085
has a 16-bit input shift register that controls the outputs to be
updated, the mode of operation, the powerdown condition,
and the binary input data. Both outputs can be updated
simultaneously or individually depending on the setting of
the two mode of operation bits.
A power-on reset circuit ensures that the DAC output powers
n DNL
n Settling Time
n Zero Code Error
n Full-Scale Error
n Supply Current
— Normal
— Pwr Down
+0.35 / −0.25 LSB (max)
6 µs (max)
+15 mV (max)
−0.75 %FS (max)
270 µA (3.6V) / 410 µA (5.5V) max
20 nA (3.6V) / 30 nA (5.5V) typ
up
to
to zero volts and remains there until there is
the device. A power-down feature reduces
apovwaDleidrawctaoriSnte-heeAt4pU.pcolimcations
sumption to less than a microWatt with three different termi- n Battery-Powered Instruments
nation options.
n Digital Gain and Offset Adjustment
The low power consumption and small packages of the n Programmable Voltage & Current Sources
DAC102S085 make it an excellent choice for use in battery n Programmable Attenuators
operated equipment.
The DAC102S085 is one of a family of pin compatible DACs,
including the 8-bit DAC084S085 and the 12-bit
DAC122S085. The DAC102S085 operates over the ex-
tended industrial temperature range of −40˚C to +105˚C.
Pin Configuration
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DS201955
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DAC102S085 pdf, 数据表
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Transfer Characteristic
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Timing Diagrams
FIGURE 1. Input / Output Transfer Characteristic
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FIGURE 2. Serial Timing Diagram
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DAC102S085 equivalent, schematic
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2.0 Applications Information
(Continued)
LM4050, IZ(min) is the minimum current required by the
LM4050 for proper regulation, and IDAC(max) is the maxi-
mum DAC102S085 supply current.
2.1.3 LP3985
The LP3985 is a low noise, ultra low dropout voltage regu-
lator with a 3% accuracy over temperature. It is a good
choice for applications that do not require a precision refer-
ence for the DAC102S085. It comes in 3.0V, 3.3V and 5V
versions, among others, and sports a low 30 µV noise speci-
fication at low frequencies. Since low frequency noise is
relatively difficult to filter, this specification could be important
for some applications. The LP3985 comes in a space-saving
5-pin SOT23 and 5-bump micro SMD packages.
tors are attractive due to their small size but generally have
ESR values that are too low for use with the LP2980. Alumi-
num electrolytic capacitors are typically not a good choice
due to their large size and have ESR values that may be too
high at low temperatures.
2.2 BIPOLAR OPERATION
The DAC102S085 is designed for single supply operation
and thus has a unipolar output. However, a bipolar output
may be obtained with the circuit in Figure 9. This circuit will
provide an output voltage range of ±5 Volts. A rail-to-rail
amplifier should be used if the amplifier supplies are limited
to ±5V.
et4U.com
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FIGURE 9. Bipolar Operation
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The output voltage of this circuit for any code is found to be
VO = (VA x (D / 1024) x ((R1 + R2) / R1) - VA x R2 / R1)
FIGURE 7. Using the LP3985 regulator
where D is the input code in decimal form. With VA = 5V and
R1 = R2,
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An input capacitance of 1.0µF without any ESR requirement
is required at the LP3985 input, while a 1.DaFtacSehraemeitc4U.com
VO = (10 x D / 1024) - 5V
capacitor with an ESR requirement of 5mto 500mis
A list of rail-to-rail amplifiers suitable for this application are
required at the output. Careful interpretation and under-
indicated in Table 2.
standing of the capacitor specification is required to ensure
correct device operation.
TABLE 2. Some Rail-to-Rail Amplifiers
2.1.4 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.
AMP
LMC7111
LM7301
LM8261
PKGS
DIP-8
SOT23-5
SO-8
SOT23-5
SOT23-5
Typ VOS Typ ISUPPLY
0.9 mV
25 µA
0.03 mV
0.7 mV
620 µA
1 mA
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FIGURE 8. Using the LP2980 regulator
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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 combination of small size and ESR. Ceramic capaci-
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