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參數資料
| 型號： | AD8552AR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational Amplifiers |
| 中文描述： | DUAL OP-AMP, 10 uV OFFSET-MAX, 1.5 MHz BAND WIDTH, PDSO8 |
| 封裝： | MS-012AA, SOIC-8 |
| 文件頁數： | 15/20頁 |
| 文件大小： | 262K |
| 代理商： | AD8552AR |
AD8551/AD8552/AD8554
–15–
REV. 0
10
m
s
100mV
WITH
SNUBBER
WITHOUT
SNUBBER
V
SY
= +5V
C
LOAD
= 4.7nF
Figure 55. Overshoot and Ringing are Substantially
Reduced Using a Snubber Network
The optimum value for the resistor and capacitor is a function of
the load capacitance and is best determined empirically since
actual C
LOAD
will include stray capacitances and may differ sub-
stantially from the nominal capacitive load. Table I shows some
snubber network values that can be used as starting points.
Table I. Snubber Network Values for Driving Capacitive Loads
C
LOAD
1 nF
4.7 nF
10 nF
R
X
200
60
20
C
X
1 nF
0.47
μ
F
10
μ
F
Power-Up Behavior
On power-up, the AD855x will settle to a valid output within 5
μ
s.
Figure 56a shows an oscilloscope photo of the output of the ampli-
fier along with the power supply voltage, and Figure 56b shows
the test circuit. With the amplifier configured for unity gain, the
device takes approximately 5
μ
s to settle to its final output voltage.
This turn-on response time is much faster than most other auto-
correction amplifiers, which can take hundreds of microseconds or
longer for their output to settle.
5
m
s
1V
V
OUT
V+
0V
0V
BOTTOM TRACE = 2V/DIV
TOP TRACE = 1V/DIV
Figure 56a. AD855x Output Behavior on Power-Up
V
SY
= 0V TO +5V
100k
V
AD855x
100k
V
V
OUT
Figure 56b. AD855x Test Circuit for Turn-On Time
APPLICATIONS
A +5 V Precision Strain-Gage Circuit
The extremely low offset voltage of the AD8552 makes it an
ideal amplifier for any application requiring accuracy with high
gains, such as a weigh scale or strain-gage. Figure 57 shows a
configuration for a single supply, precision strain-gage measure-
ment system.
A REF192 provides a +2.5 V precision reference voltage for A2.
The A2 amplifier boosts this voltage to provide a +4.0 V reference
for the top of the strain-gage resistor bridge. Q1 provides the cur-
rent drive for the 350
bridge network. A1 is used to amplify the
output of the bridge with the full-scale output voltage equal to:
(
R
R
B
Where
R
B
is the resistance of the load cell. Using the values given
in Figure 57, the output voltage will linearly vary from 0 V with
no strain to +4.0 V under full strain.
2
1
2
×
+
)
R
(17)
V
OUT
0V TO +4.0V
350
V
LOAD
CELL
AD8552-A
R
4
100
V
R
1
17.4k
V
R
2
100
V
NOTE: USE 0.1% TOLERANCE RESISTORS.
20k
V
A1
A2
AD8552-B
REF192
12.0k
V
1k
V
+5V
+2.5V
6
4
3
2
+4.0V
40mV
FULL-SCALE
Q1
2N2222
OR
EQUIVALENT
R
3
17.4k
V
Figure 57. A +5 V Precision Strain-Gage Amplifier
+3 V Instrumentation Amplifier
The high common-mode rejection, high open-loop gain, and
operation down to +3 V of supply voltage makes the AD855x
an excellent choice of op amp for discrete single supply instru-
mentation amplifiers. The common-mode rejection ratio of
the AD855x is greater than 120 dB, but the CMRR of the sys-
tem is also a function of the external resistor tolerances. The
gain of the difference amplifier shown in Figure 58 is given as:
V
V
R
+
3
R
R
R
R
V
R
R
OUT
=
+
1
1
2
4
4
1
2
2
1
(18)
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