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參數(shù)資料
| 型號(hào)： | OP290 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Precision, Low Power, Micropower Dual Operational Amplifier |
| 中文描述： | 精密，低功耗，微功耗雙路運(yùn)算放大器 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大小： | 165K |
| 代理商： | OP290 |
REV. A
OP290
–8–
1
7
4
5
6
3
2
8
+18V
–
18V
100k
200
100k
1/2
OP290
1/2
OP290
Figure 2. Burn-In Circuit
APPLICATIONS INFORMATION
BATTERY-POWERED APPLICATIONS
The OP290 can be operated on a minimum supply voltage of
1.6 V, or with dual supplies of 0.8 V, and draws only 19 pA of
supply current. In many battery-powered circuits, the OP290
can be continuously operated for thousands of hours before
requiring battery replacement, reducing equipment downtime
and operating cost.
High-performance portable equipment and instruments fre-
quently use lithium cells because of their long shelf-life, light
weight, and high energy density relative to older primary cells.
Most lithium cells have a nominal output voltage of 3 V and are
noted for a flat discharge characteristic. The low supply voltage
requirement of the OP290, combined with the flat discharge
characteristic of the lithium cell, indicates that the OP290 can
be operated over the entire useful life of the cell. Figure 1 shows
the typical discharge characteristic of a 1 Ah lithium cell power-
ing an OP290 with each amplifier, in turn, driving full output
swing into a 100 k
load.
INPUT VOLTAGE PROTECTION
The OP290 uses a PNP input stage with protection resistors in
series with the inverting and noninverting inputs. The high
breakdown of the PNP transistors coupled with the protection
resistors provide a large amount of input protection, allowing
the inputs to be taken 20 V beyond either supply without dam-
aging the amplifier.
SINGLE-SUPPLY OUTPUT VOLTAGE RANGE
In single-supply operation the OP290’s input and output ranges
include ground. This allows true “zero-in, zero-out” operation.
The output stage provides an active pull-down to around 0.8 V
above ground. Below this level, a load resistance of up to 1 MS2
to ground is required to pull the output down to zero.
In the region from ground to 0.8 V, the OP290 has voltage gain
equal to the data sheet specification. Output current source capa-
bility is maintained over the entire voltage range including ground.
+15V
+15V
–
15V
–
15V
V2
V
IN
1k
9k
100
10k
V1 20Vp-p @ 10Hz
CHANNEL SEPARATION = 20 LOG
V1
V2/1000
1/2
OP290
A
1/2
OP290
B
OP37A
Figure 3. Channel Separation Test Circuit
APPLICATIONS
TEMPERATURE TO 4–20 mA TRANSMITTER
A simple temperature to 4–20 mA transmitter is shown in Figure 5.
After calibration, the transmitter is accurate to +0.5
°
C over the
–50
°
C to +150
°
C temperature range. The transmitter operates
from 8 V to 40 V with supply rejection better than 3 ppm/V.
One half of the OP290 is used to buffer the V
TEMP
pins while
the other half regulates the output current to satisfy the current
summation at its noninverting input.
(
I
V
R
R
R2 10
V
R R R
R2 10
OUT
TEMP
SET
=
+
)
6
7
2
6
7
–
L
C
–
100
80
0
0
60
40
20
3500
3000
2500
500
1000
2000
1500
HOURS
Figure 4. Lithium Sulphur Dioxide Cell Discharge
Characteristic with OP290 and 100 k Loads
The change in output current with temperature is the derivative
of the transfer function:
I
T
V
T
R
R
R2 10
OUT
TEMP
=
+
(
)
6
7
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| OP290ARCMDA | OP-AMP|DUAL|BIPOLAR|LLCC|20PIN|CERAMIC |
| OP290AZMDA | OP-AMP|DUAL|BIPOLAR|DIP|8PIN|CERAMIC |
| OP290AZ | Precision, Low Power, Micropower Dual Operational Amplifier |
| OP290EZ | Precision, Low Power, Micropower Dual Operational Amplifier |
| OP290FZ | Precision, Low Power, Micropower Dual Operational Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OP-290 | 制造商:AD 制造商全稱:Analog Devices 功能描述:PRECISION, LOW POWER, MICROPOWER DUAL OPERATIONAL AMPLIFIER |
| OP290_03 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Precision, Low Power, Micropower Dual Operational Amplifier |
| OP2900005P | 制造商:Analog Devices 功能描述: |
| OP290A | 功能描述:紅外發(fā)射源 IR EMITTING DIODE RoHS:否 制造商:Fairchild Semiconductor 波長:880 nm 射束角:+/- 25 輻射強(qiáng)度: 最大工作溫度:+ 100 C 最小工作溫度:- 40 C 封裝 / 箱體:Side Looker 封裝:Bulk |
| OP290ARC/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 |
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