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參數(shù)資料
| 型號： | OP113 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Low Noise, Low Drift Single-Supply Operational Amplifiers(低噪聲,低漂移,單電源運算放大器) |
| 中文描述： | 低噪聲，低漂移單電源運算放大器（低噪聲，低漂移，單電源運算放大器） |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 438K |
| 代理商： | OP113 |
OP113/OP213/OP413
–6–
REV. B
APPLICAT ION CIRCUIT S
A High Precision Industrial Load-Cell Scale Amplifier
T he OP113 family makes an excellent amplifier for conditioning
a load-cell bridge. Its low noise greatly improves the signal reso-
lution, allowing the load cell to operate with a smaller output
range, thus reducing its nonlinearity. Figure 1 shows one half of
the OP113 family used to generate a very stable 10.000 V bridge
excitation voltage while the second amplifier provides a differen-
tial gain. R4 should be trimmed for maximum common-mode
rejection.
A Low Voltage Single Supply, Strain-Gage Amplifier
T he true zero swing capability of the OP113 family allows the
amplifier in Figure 2 to amplify the strain-gage bridge accurately
even with no signal input while being powered by a single +5
volt supply. A stable 4.000 V bridge voltage is made possible by
the rail-to-rail OP295 amplifier, whose output can swing to
within a millivolt of either rail. T his high voltage swing greatly
increases the bridge output signal without a corresponding in-
crease in bridge input.
8
7
4
6
5
R4
100k
OUTPUT
0V
→
3.5V
+5V
350
35mV
F.S.
6
2
IN
4
OUT
GND
REF-43
8
1
4
2
3
1/2
OP-295
+5V
2.500V
2N2222A
4.000V
1
2
3
R2
20k
R3
20k
R5
2.10k
R6
27.4
R
G
= 2,127.4
R1
100k
1/2
OP-295
1/2
OP-213
R7
20.0k
R8
12.0k
Figure 2. Single Supply Strain-Gage Amplifier
A High Accuracy Linearized RT D T hermometer Amplifier
Zero suppressing the bridge facilitates simple linearization of the
RT D by feeding back a small amount of the output signal to the
RT D (Resistor T emperature Device). In Figure 3 the left leg of
the bridge is servoed to a virtual ground voltage by amplifier
A1, while the right leg of the bridge is also servoed to zero-volt
by amplifier A2. T his eliminates any error resulting from
common-mode voltage change in the amplifier. A three-wire
RT D is used to balance the wire resistance on both legs of the
bridge, thereby reducing temperature mismatch errors. T he
5.000 V bridge excitation is derived from the extremely stable
AD588 reference device with 1.5 ppm/
°
C drift performance.
Linearization of the RT D is done by feeding a fraction of the
output voltage back to the RT D in the form of a current. With
just the right amount of positive feedback, the amplifier output
will be linearly proportional to the temperature of the RT D.
8
7
4
5
6
V
OUT
(10mV/°C)
–1.50V = –150°C
+15V
R4
100
–15V
R7
100
R5
4.02k
R
G
FULL SCALE ADJUST
R8
49.9k
R9
5k
ADJUST
@1/2 F.S.
R
W1
R
W2
R
W3
100
RTD
1
3
2
A1
1/2OP-213
1
2
4
AD588BD
16
14
15
8
10
6
11
12
13
9
3
7
10μF
–15V +15V
R2
8.25k
R1
8.25k
R3
50
A2
1/2OP-213
Figure 3. Ultraprecision RTD Amplifier
T o calibrate the circuit, first immerse the RT D in a zero-degree
ice bath or substitute an exact 100
resistor in place of the
RT D. Adjust the ZERO ADJUST potentiometer for a 0.000 V
output, then set R9 LINEARIT Y ADJUST potentiometer to
the middle of its adjustment range. Substitute a 280.9
resistor
(equivalent to 500
°
C) in place of the RT D, and adjust the
FULL-SCALE ADJUST potentiometer for a full-scale voltage
of 5.000 V.
T o calibrate out the nonlinearity, substitute a 194.07
resistor
(equivalent to 250
°
C) in place of the RT D, then adjust the LIN-
EARIT Y ADJUST potentiometer for a 2.500 V output. Check
and readjust the full-scale and half-scale as needed.
Once calibrated, the amplifier outputs a 10 mV/
°
C temperature
coefficient with an accuracy better than
±
0.5
°
C over an RT D
measurement range of –150
°
C to +500
°
C. Indeed the amplifier
can be calibrated to a higher temperature range, up to 850
°
C.
A High Accuracy T hermocouple Amplifier
Figure 4 shows a popular K -type thermocouple amplifier with
cold-junction compensation. Operating from a single +12 volt
supply, the OP113 family’s low noise allows temperature mea-
surement to better than 0.02
°
C resolution from 0
°
C to 1000
°
C
range. T he cold-junction error is corrected by using an inexpen-
sive silicon diode as a temperature measuring device. It should
be placed as close to the two terminating junctions as physically
possible. An aluminum block might serve well as an isothermal
system.
8
1
0V TO 10.00V
(0°C TO 1000°C)
4
3
2
1/2
OP-213
+12V
R9
124k
2
4
REF-02EZ
6
R5
40.2k
R1
10.7k
10μF
0.1μF
R8
453
R2
2.74k
R6
200
+5.000V
R4
5.62k
R3
53.6
D1
1N4148
Cu
Cu
K-TYPE
THERMOCOUPLE
40.7μV/°C
+12V
0.1μF
Figure 4. Accurate K-Type Thermocouple Amplifier
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| OP113_07 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Noise, Low Drift Single-Supply Operational Amplifiers |
| OP113AZ/883 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
| OP113BZ/883 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
| OP113EP | 制造商:Rochester Electronics LLC 功能描述:SINGLE LO-NOISE LO-DRIFT - Bulk |
| OP113ES | 功能描述:IC OPAMP GP 3.4MHZ LN 40MA 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:Excalibur™ 放大器類型:J-FET 電路數(shù):1 輸出類型:- 轉(zhuǎn)換速率:45 V/µs 增益帶寬積:10MHz -3db帶寬:- 電流 - 輸入偏壓:20pA 電壓 - 輸入偏移:490µV 電流 - 電源:1.7mA 電流 - 輸出 / 通道:48mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 38 V，±2.25 V ~ 19 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:8-SOIC 包裝:帶卷 (TR) |
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