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參數資料
| 型號： | SP9841 |
| 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： | 23/32頁 |
| 文件大小： | 745K |
| 代理商： | SP9841 |
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289
Figure 7. Generating Programmable DC Voltages.
+
–
DC
OUT
1/8 of SP9841
3
ICL8069
1.22V
+
–
OP–90
R1
10K
V
I
R2
4.75K
+1.8V
DC
OUT
At PRESET, DC
OUT
= +1.8V
(*Optional Noise Reduction)
= 20mV to +3.6V for DATA = 00
H
to FF
H
.
+ –
R3
1.2K
45μF*
Figure 8
shows a non–programmed standalone appli-
cation. By tying PRESETL to ground, all channels are
permanently set to unity gain. While preset, the input
impedance at each input is set to 40kOhms nominal
(20kOhms minimum), which minimizes required
input current drive. The TL431 reference is pro-
grammed by resistors R
1
and R
for 3.3V. R
is chosen
to provide at least 165
μ
A for each input driven, plus
0.5mA for the reference at the minimum supply value
to be considered. In the
Figure
, the 560 Ohms shown
will drive all eight inputs. The excellent capacitive
load capability of the output amplifiers handles any
value of capacitive bypass loads without oscillation;
however, to minimize ringing at powerup, load ca-
pacitance can be chosen to be greater than 0.1
μ
F or
less than 1,000pF.
of 3.75V while running from a 4.75V supply, this
behavior is not tested in device production. If
maximum linearity is required near the 3.66V
fullscale voltage, then output loading should be
kept under 1mA.
Figure 7
uses a 1.8V reference to provide an output
voltage range from near ground to almost 3.6V.
The external micropower reference uses a bandgap
in a bootstrapped configuration, which guarantees
excellent supply rejection. Voltage at V
1
is set by
1.223
R2
+
(R1
R2)
V
is 1.223V +V
. R
is used to set the quies-
cent current through the bandgap, I=V
/R
. The
op amp will easily drive one to all eight inputs.
Figure 8. Generating Up to Eight (8) 3.3V @ 10mA DC Supplies with Logic–Level Controlled Shutdown (Non–Programmed).
+
–
DC
OUT
1/8 of SP9841
PRESET
Eight independent 3.3V @ 10mA supplies with
logic–level controlled shutdown.
32K
+5V
+
–
2.5V
100K
TL431
560
AC04
DIG
IN
DIG
IN
DC
OUT
0
1
3.3V
0V
相關PDF資料 |
PDF描述 |
|---|---|
| SP9841BN | 8-Bit Octal, 2-Quadrant Multiplying, BiCMOS DAC |
| SP9841BS | 8-Bit Octal, 2-Quadrant Multiplying, BiCMOS DAC |
| SP9841KN | 8-Bit Octal, 2-Quadrant Multiplying, BiCMOS DAC |
| SP9841KS | 8-Bit Octal, 2-Quadrant Multiplying, BiCMOS DAC |
| SP9842 | 8-Bit Octal, 2-Quadrant Multiplying, BiCMOS DAC |
相關代理商/技術參數 |
參數描述 |
|---|---|
| SP9841BN | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:8-Bit Octal, 2-Quadrant Multiplying, BiCMOS DAC |
| SP9841BS | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:8-Bit Octal, 2-Quadrant Multiplying, BiCMOS DAC |
| SP9841KN | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:8-Bit Octal, 2-Quadrant Multiplying, BiCMOS DAC |
| SP9841KS | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:8-Bit Octal, 2-Quadrant Multiplying, BiCMOS DAC |
| SP9842 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:8-Bit Octal, 2-Quadrant Multiplying, BiCMOS DAC |
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