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參數(shù)資料
| 型號： | OP285ES |
| 英文描述： | Voltage-Feedback Operational Amplifier |
| 中文描述： | 電壓反饋運(yùn)算放大器 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 248K |
| 代理商： | OP285ES |
REV. A
OP285
–8–
16
–
20V
0.1 F
V+
V
–
5V
D1
D2
+15V
2N4416
D3
D4
OUTPUT
(TO SCOPE)
1 F
IC2
2N2222A
–
15V
1N4148
DUT
1/2 OP260AJ
16
–
20V
–
+
+
–
SCHOTTKY DIODES D1
–
D4 ARE
HEWLETT-PACKARD HP5082-2835
IC1 IS 1/2 OP260AJ
IC2 IS PMI OP41EJ
15k
R
L
1k
0.1 F
10k
10k
R
F
2k
R
G
222
750
1k
+15V
3
8
1
4
2
–
15V
+ 7A13 PLUG-IN
–
7A13 PLUG-IN
2N3904
300pF
15V
1N4148
TTL
INPUT
15V
1.8k
0.1 F
V
REF
(
–
2N2907
I
OUT
|V
REF
|
1k
*
NOTE
DECOUPLE CLOSE
TOGETHER ON GROUND PLAN
WITH SHORT LEAD LENGTHS.
*
0.01 F
0.47 F
+
10 F
0.1 F
0.1 F
220
1k
1k
1.5k
1/2
OP285
–
+
Figure 5. Transient Output Load Current Test Fixture
10
90
100
0%
A1 1,2 V
138.9
NS
5V
TTL CTRL
(5V/ DIV)
10V
V
OUT
(2MV/ DIV)
2MV
50NS
Figure 6. OP285’s Output Load Current Recovery Time
Measuring Settling Time
The design of OP285 combines high slew rate and wide gain-
bandwidth product to produce a fast-settling (ts < l
μ
s) amplifier
for 8- and 12-bit applications. The test circuit designed to measure
the settling time of the OP285 is shown in Figure 7. This test
method has advantages over false-sum node techniques in that
the actual output of the amplifier is measured, instead of an
error voltage at the sum node. Common-mode settling effects
are exercised in this circuit in addition to the slew rate and
bandwidth effects measured by the false-sum-node method. Of
course, a reasonably flat-top pulse is required as the stimulus.
The output waveform of the OP285 under test is clamped by
Schottky diodes and buffered by the JFET source follower.
The signal is amplified by a factor of ten by the OP260 and
then Schottky-clamped at the output to prevent overloading
the oscilloscope’s input amplifier. The OP41 is configured as
a fast integrator which provides overall dc offset nulling.
High Speed Operation
As with most high speed amplifiers, care should be taken with
supply decoupling, lead dress, and component placement. Rec-
ommended circuit configurations for inverting and noninverting
applications are shown in Figures 8 and Figure 9.
+15V
+
2
3
8
1
4
V
IN
V
OUT
–
15V
10 F
0.1 F
R
L
15k
0.1 F
10 F
+
–
OP285
1/2
Figure 8. Unity Gain Follower
Figure 7. OP285’s Settling Time Test Fixture
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| OP285FP | Voltage-Feedback Operational Amplifier |
| OP285FS | Voltage-Feedback Operational Amplifier |
| OP285GS | Dual 9 MHz Precision Operational Amplifier |
| OP285GSR | Dual 9 MHz Precision Operational Amplifier |
| OP285 | Dual 9 MHz Precision Operational Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OP285FP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
| OP285FS | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
| OP285G | 制造商:Analog Devices 功能描述: |
| OP-285GBC | 制造商:AD 制造商全稱:Analog Devices 功能描述:DUAL, 9MHz PRECISION OPERATIONAL AMPLIFIER |
| OP285GP | 制造商:Analog Devices 功能描述:IC OP AMP DUAL 9MHZ DIP8 285 |
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