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參數資料
| 型號： | op490 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Low Voltage Micropower Quad Operational Amplifier(低電壓微功率四運放) |
| 中文描述： | 低電壓，微功耗四運算放大器（低電壓微功率四運放） |
| 文件頁數： | 8/12頁 |
| 文件大小： | 251K |
| 代理商： | OP490 |
OP490
REV. B
–8–
Figure 1. Lithium-Sulphur Dioxide Cell Discharge Charac-
teristic with OP490 and 100 k
Loads
requirement of the OP490, combined with the flat discharge
characteristic of the lithium cell, indicates that the OP490 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 OP490 with each amplifier, in turn, driving full output
swing into a 100 k
load.
SINGLE -SUPPLY OUT PUT VOLT AGE RANGE
In single-supply operation the OP490’s input and output ranges
include ground. T his allows true “zero-in, zero-out” operation.
T he output stage provides an active pull-down to around 0.8 V
above ground. Below this level, a load resistance of up to 1 M
to ground is required to pull the output down to zero.
In the region from ground to 0.8 V the OP490 has voltage gain
equal to the data sheet specification. Output current source ca-
pability is maintained over the entire voltage range including
ground.
INPUT VOLT AGE PROT E CT ION
T he OP490 uses a PNP input stage with protection resistors in
series with the inverting and noninverting inputs. T he high
breakdown of the PNP transistors coupled with the protection
resistors provides a large amount of input protection, allowing
the inputs to be taken 20 V beyond either supply without dam-
aging the amplifier.
Channel Separation Test Circuit
APPLICAT IONS INFORMAT ION
BAT T E RY -POWE RE D APPLICAT IONS
T he OP490 can be operated on a minimum supply voltage of
+1.6 V, or with dual supplies of
±
0.8 V, and draws only 60
μ
A
of supply current. In many battery-powered circuits, the OP490
can be continuously operated for hundreds of hours before re-
quiring battery replacement, reducing equipment downtime and
operating costs.
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. T he low supply current
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