參數(shù)資料
型號(hào)： DAC8248HP
廠商： PRECISION MONOLITHICS INC
元件分類(lèi)： DAC
英文描述： Dual 12-Bit 8-Bit Byte Double-Buffered CMOS D/A Converter
中文描述： 12-BIT DAC, PDIP24
文件頁(yè)數(shù)： 14/16頁(yè)
文件大?。?/td> 350K
代理商： DAC8248HP
DAC8248
–14–
REV. B
ground as shown in Figure 9. T he output voltage will be be-
tween +5 V and +10 V depending on the digital input code.
T he output expression is given by:
V
OUT
= V
OS
×
(D/
4096
)(V
OS
)
where
V
OS
= Offset Reference Voltage (+5 V in Figure 9)
D
= Decimal Equivalent of the Digital Input Word
VOLT AGE SWIT CHING MODE
Figure 10 shows the DAC8248 in another single supply configu-
ration. T he R-2R ladder is used in the voltage switching mode
and functions as a voltage divider. T he output voltage (at the
V
REF
pin) exhibits a constant impedance R (typically 11 k
) and
must be buffered by an op amp. T he R
FB
pins are not used and
are left open. T he reference input voltage must be maintained
within +1.25 V of AGND, and V
DD
between +12 V and +15 V;
this ensures that device accuracy is preserved.
T he output voltage expression is given by:
V
OUT
= V
REF
(D/
4096
)
where
D
= Decimal Equivalent of the Digital Input Word
APPLICAT IONS T IPS
GE NE RAL GROUND MANAGE ME NT
Grounding techniques should be tailored to each individual sys-
tem. Ground loops should be avoided, and ground current paths
should be as short as possible and have a low impedance.
T he DAC8248’s AGND and DGND pins should be tied to-
gether at the device socket to prevent digital transients from ap-
pearing at the analog output. T his common point then becomes
the single ground point connection. AGND and DGND is then
brought out separately and tied to their respective power supply
grounds. Ground loops can be created if both grounds are tied
together at more than one location, i.e., tied together at the de-
vice and at the digital and analog power supplies.
PC board ground plane can be used for the single point ground
connection should the connections not be practical at the device
socket. If neither of these connections are practical or allowed,
then the device should be placed as close as possible to the sys-
tems single point ground connection. Back-to-back Schottky di-
odes should then be connected between AGND and DGND.
POWE R SUPPLY DE COUPLING
Power supplies used with the DAC8248 should be well filtered
and regulated. Local supply decoupling consisting of a 1
μ
F to
10
μ
F tantalum capacitor in parallel with a 0.1
μ
F ceramic is
highly recommended. T he capacitors should be connected be-
tween the V
DD
and DGND pins and at the device socket.
Figure 9. Single Supply Operation (Current Switching Mode)
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DAC8248HS 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:Dual 12-Bit 8-Bit Byte Double-Buffered CMOS D/A Converter
DAC8308 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Converter IC
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DAC8311_08 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:1.8V to 5.5V, 80mA, 14- and 16-Bit, Low-Power, Single-Channel,DIGITAL-TO-ANALOG CONVERTERS in SC70 Package
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