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參數(shù)資料
| 型號(hào)： | SP9841KS |
| 英文描述： | 8-Bit Octal, 2-Quadrant Multiplying, BiCMOS DAC |
| 中文描述： | 8位八路，2象限乘法，BiCMOS工藝援 |
| 文件頁(yè)數(shù)： | 22/32頁(yè) |
| 文件大?。?/td> | 745K |
| 代理商： | SP9841KS |
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288
through 19
show that for lower output current values
less than 1 mA, the
SP9841/9842
can be used effec-
tively even with V
DD
in the range of 2.7 to 3.3V.
Application Circuits
Figure 5
shows an inexpensive single–quadrant
DC source for generating voltages from near
ground to near 2.44V. When using a two–termi-
nal reference, the pull–up resistor should be
chosen so that the minimum input resistance of
5kOhms at each V
IN
(X) can be driven at the
lowest expected V
. At V
= 4.75V, and V
= 1.25V, each input to be driven needs 0.248mA,
and the regulator needs 0.1mA to stay well
regulated. Thus, to drive all eight inputs, R
should be chosen to supply at least 2mA. To
operate at 4.75V, 1.75kOhms is required; the
1.5kOhms shown will suffice even if its value is
5% high. To drive a single input, a 10kOhm
value could be used. In order to reduce reference
and supply generated noise, an optional capaci-
tor of 1 to 100
μ
F bypasses the reference.
Figure 6
shows a circuit which generates DC
voltages roughly symmetric with respect to
2.446V. Two bandgap references are stacked to
first drive V
to 1.223V, and the input to 2.446V.
The pull–up resistor value should again be scaled
for worst–case loading — in order to drive all eight
inputs at 4.75V, a value of 620 Ohms is required.
At fullscale, the DAC output is near 3.65V. While
typical units will source 5mA at an output voltage
Figure 5. Inexpensive DC Source.
+
–
DC
OUT
1/8 of SP9841
3
+5V
1.22V
ICL8069
DC
OUT
At PRESET, DC
OUT
= +1.22V
= 20mV to +2.44V for DATA = 00
H
to FF
H
.
R
PULLUP
1.5kOhms
45μF*
(*Optional Noise Reduction)
Figure 6. Pseudo Bipolar Source Generates Voltages Above and Below 2.44V.
+
–
DC
OUT
1/8 of SP9841
3
+5V
1.22V
ICL8069
DC
OUT
At PRESET, DC
OUT
= +2.44V
= +1.22V to +3.66V for DATA = 00
H
to FF
H
.
2kOhm
1.22V
ICL8069
+1.22V
+2.44V
45μF*
(*Optional Noise Reduction)
45μF*
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PDF描述 |
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| SP9842 | 8-Bit Octal, 2-Quadrant Multiplying, BiCMOS DAC |
| SP9842BS | 8-Bit Octal, 2-Quadrant Multiplying, BiCMOS DAC |
| SP9842KS | 8-Bit Octal, 2-Quadrant Multiplying, BiCMOS DAC |
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| SPP04N60S5 | Cool MOS Power Transistor(MOS 型功率晶體管) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP9842 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:8-Bit Octal, 2-Quadrant Multiplying, BiCMOS DAC |
| SP9842BS | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:8-Bit Octal, 2-Quadrant Multiplying, BiCMOS DAC |
| SP9842KS | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:8-Bit Octal, 2-Quadrant Multiplying, BiCMOS DAC |
| SP9843 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:8-Bit Octal, 4-Quadrant Multiplying, BiCMOS DAC |
| SP9843BS | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:8-Bit Octal, 4-Quadrant Multiplying, BiCMOS DAC |
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