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5962-89670013A 参数 Datasheet PDF下载

5962-89670013A图片预览
型号: 5962-89670013A
PDF下载: 下载PDF文件 查看货源
内容描述: 低电压,微功耗四路运算放大器 [Low Voltage Micropower Quad Operational Amplifier]
分类和应用: 运算放大器放大器电路
文件页数/大小: 16 页 / 1815 K
品牌: ADI [ ADI ]
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OP490  
–18V  
APPLICATIONS INFORMATION  
Battery-Powered Applications  
The 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 mA of  
supply current. In many battery-powered circuits, the OP490  
can be continuously operated for hundreds of hours before  
requiring battery replacement, reducing equipment downtime,  
and operating costs.  
14  
13  
12  
11  
9
6
8
7
10  
D
C
B
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 current  
A
2
3
4
1
5
4
3
2
1
0
GND  
+18V  
Figure 2. Burn-In Circuit  
+15V  
+15V  
1/4  
OP490A  
OP37A  
V2  
1k⍀  
0
250  
500  
750  
1000  
1500  
1750  
HOURS  
100⍀  
10k⍀  
–15V  
Figure 4. Lithium-Sulphur Dioxide Cell Discharge Charac-  
teristic with OP490 and 100 kW Loads  
–15V  
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 4 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 kW load.  
1/4  
V
IN  
OP490B  
V1  
20V p-p @ 10Hz  
V1  
V2/1000  
Single-Supply Output Voltage Range  
CHANNEL SEPARATION = 20 LOG  
1/4  
In single-supply operation the OP490’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 MW  
to ground is required to pull the output down to zero.  
OP490C  
In the region from ground to 0.8 V, the OP490 has voltage gain  
equal to the data sheet specification. Output current source  
capability is maintained over the entire voltage range including  
ground.  
1/4  
OP490D  
Input Voltage Protection  
The OP490 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 provides a large amount of input protection, allowing  
the inputs to be taken 20 V beyond either supply without dam-  
aging the amplifier.  
Figure 3. Channel Separation Test Circuit  
REV. C  
–9–