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參數(shù)資料
| 型號： | SP9842 |
| 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 |
| 文件頁數(shù)： | 24/32頁 |
| 文件大?。?/td> | 745K |
| 代理商： | SP9842 |
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290
Figure 9
shows a DAC channel controlling the output
voltage of an LM317 voltage regulator. By program-
ming the code, the DAC changes its own supply
voltage. This circuit can be modified for wider output
voltage ranges by reducing the value of R
. However,
the circuit as shown requires the DAC to sink 1mA to
the negative rail at code 0 at its lowest V
, at which
point the output voltage is 62mV. Thus, programming
codes 0 through 5 will do little to influence the output.
If R
is replaced with a short circuit, useful operation
would be between 3.9V and 6.15V output; however,
the DAC output must then sink 2.5mA at V
= 3.9V,
which results in a minimum DAC output voltage of
Figure 9. Programmable 1Amp Power Source.
+
–
V
OUT
1/8 of SP9841
3
+12V
ICL8069
1.22V
At PRESET, V
OUT
= 5.0V
10kOhms
R1
499Ohms
V
A
V
OUT
= 4.5V TO 5.5V at 1Amp for DATA = 00
H
to FF
H
.
LM317
In Out
Adjust
10μF
R2
1kOhms
R3
511Ohms
V
DD
R4
681Ohms
around 150mV. Codes above 17 will then provide
equally spaced output voltage increments.
Figure 10
shows how the gain of an external non–
inverting op amp can be programmed. R
and R
are
chosen for nominal gain. R
is then ratioed to
R
to provide the desired range of gain trim. A wide
gain grange is achievable — for example, with R
=
11kOhms, R
= 1kOhms and R
= 2.74kOhms,
gain would be programmed linearly from 8 to just
under 16.
The OP–491 shown in
Figure 10
is capable for
Figure 10. Adjustable Gain of External Non–Inverting Opamp Circuit; V
OUT
= Rail–to–rail.
+
–
SIG OUT
1/8 of SP9841
3
1/4 of OP–491
+5V
Set R
TRIMRANGE
for desired gain-trim range.
For R
TRIMRANGE
= 20kOhms:
Code 0, A
V
= +5.5
Code 128, A
V
= +5.0
Code 255, A
V
= +4.51
+
–
R
F
10kOhms
R
TRIMRANGE
20kOhms
R
IBIAS
50kOhms
V
REFL
= Up to V
DD
/2
(2.5V nominal for
rail–to–rail output
at SIG OUT)
1V
P-P
2.2μF
R
GAIN
2.5kOhms
V
REFL
A
R
R
V
F
G
F
TRIMRANGE
R
D
128
R
= +
1
+
1
, D = 0 to 255
+5V
V
DD
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP9842BS | 8-Bit Octal, 2-Quadrant Multiplying, BiCMOS DAC |
| SP9842KS | 8-Bit Octal, 2-Quadrant Multiplying, BiCMOS DAC |
| SPB04N60S5 | Cool MOS Power Transistor(MOS 型功率晶體管) |
| SPP04N60S5 | Cool MOS Power Transistor(MOS 型功率晶體管) |
| SPC-0605 | SMD POWER INDUCTORS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| SP9843KS | 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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