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OP491GRUZ-REEL

更新时间： 2024-02-28 02:36:02
品牌 Logo 应用领域
亚德诺 - ADI 运算放大器
页数 文件大小 规格书
24页 604K
描述
Micropower Single-Supply Rail-to-Rail Input/Output Op Amps

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OP491GRUZ-REEL 技术参数

是否Rohs认证： 不符合生命周期：Obsolete
零件包装代码：TSSOP包装说明：TSSOP-14
针数：14Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.31.00.01
风险等级：5.71放大器类型：OPERATIONAL AMPLIFIER
架构：VOLTAGE-FEEDBACK最大平均偏置电流 (IIB)：0.07 µA
25C 时的最大偏置电流 (IIB)：0.05 µA标称共模抑制比：87 dB
频率补偿：YES最大输入失调电压：1250 µV
JESD-30 代码：R-PDSO-G14JESD-609代码：e0
长度：5 mm低-偏置：NO
低-失调：NO微功率：YES
功能数量：4端子数量：14
最高工作温度：125 °C最低工作温度：-40 °C
封装主体材料：PLASTIC/EPOXY封装代码：TSSOP
封装等效代码：TSSOP14,.25封装形状：RECTANGULAR
封装形式：SMALL OUTLINE, THIN PROFILE, SHRINK PITCH峰值回流温度（摄氏度）：220
功率：NO电源：3/5/+-5 V
可编程功率：NO认证状态：Not Qualified
座面最大高度：1.1 mm子类别：Operational Amplifier
最大压摆率：1.92 mA供电电压上限：16 V
标称供电电压 (Vsup)：3 V表面贴装：YES
技术：BICMOS温度等级：AUTOMOTIVE
端子面层：Tin/Lead (Sn/Pb)端子形式：GULL WING
端子节距：0.65 mm端子位置：DUAL
处于峰值回流温度下的最长时间：30标称均一增益带宽：3000 kHz
最小电压增益：25000宽带：NO
宽度：4.4 mmBase Number Matches：1

OP491GRUZ-REEL 数据手册

 浏览型号OP491GRUZ-REEL的Datasheet PDF文件第18页浏览型号OP491GRUZ-REEL的Datasheet PDF文件第19页浏览型号OP491GRUZ-REEL的Datasheet PDF文件第20页浏览型号OP491GRUZ-REEL的Datasheet PDF文件第21页浏览型号OP491GRUZ-REEL的Datasheet PDF文件第23页浏览型号OP491GRUZ-REEL的Datasheet PDF文件第24页 
OP191/OP291/OP491  
The filter section uses a pair of OP491s in a twin-T  
3 V, 50 HZ/60 HZ ACTIVE NOTCH FILTER WITH  
FALSE GROUND  
configuration whose frequency selectivity is very sensitive  
to the relative matching of the capacitors and resistors in  
the twin-T section. Mylar is the material of choice for the  
capacitors, and the relative matching of the capacitors and  
resistors determines the pass band symmetry of the filter. Using  
1% resistors and ±% capacitors produces satisfactory results.  
To process ac signals in a single-supply system, it is often best  
to use a false ground biasing scheme. Figure 72 illustrates a  
circuit that uses this approach. In this circuit, a false-ground  
circuit biases an active notch filter used to reject ±0 Hz/60 Hz  
power line interference in portable patient monitoring  
equipment. Notch filters are quite commonly used to reject  
power line frequency interference that often obscures low  
frequency physiological signals, such as heart rates, blood  
pressure readings, EEGs, and EKGs. This notch filter effectively  
squelches 60 Hz pickup at a filter Q of 0.7±. Substituting  
3.16 kΩ resistors for the 2.67 kΩ resistors in the twin-T section  
(R1 through R±) configures the active filter to reject ±0 Hz  
interference.  
SINGLE-SUPPLY, HALF-WAVE, AND FULL-WAVE  
RECTIFIERS  
An OPx91 device configured as a voltage follower operating on  
a single supply can be used as a simple half-wave rectifier in low  
frequency (<2 kHz) applications. A full-wave rectifier can be  
configured with a pair of OP291s, as illustrated in Figure 73.  
The circuit works in the following way. When the input signal is  
above 0 V, the output of Amplifier A1 follows the input signal.  
Because the noninverting input of Amplifier A2 is connected to  
the output of A1, op amp loop control forces the inverting input  
of the A2 to the same potential. The result is that both terminals  
of R1 are equipotential; that is, no current flows. Because there  
is no current flow in R1, the same condition exists for R2; thus,  
the output of the circuit tracks the input signal. When the input  
signal is below 0 V, the output voltage of A1 is forced to 0 V.  
This condition now forces A2 to operate as an inverting voltage  
follower because the noninverting terminal of A2 is also at 0 V.  
The output voltage at VOUTA is then a full-wave rectified version  
of the input signal. If needed, a buffered, half-wave rectified  
version of the input signal is available at VOUTB.  
R2  
2.67kꢀ  
R1  
3V  
2.67kꢀ  
C1  
1μF  
C2  
1μF  
11  
2
3
1/4  
OP491  
1
5
V
V
IN  
OUT  
R3  
R4  
2.67kꢀ  
1/4  
OP491  
2.67kꢀ  
7
A1  
4
6
A2  
R5  
C3  
2μF  
(1μF × 2)  
R6  
100kꢀ  
1.33kꢀ  
(2.67kꢀ ÷ 2)  
R7  
1kꢀ  
R8  
1kꢀ  
R11  
100kꢀ  
C5  
3V  
R1  
100kꢀ  
R2  
100kꢀ  
0.01μF  
R9  
1Mꢀ  
R12  
499ꢀ  
9
1/4  
5V  
8
8
6
5
OP491  
V
A
C6  
1.5V  
1μF  
OUT  
OUT  
1/2  
OP291  
V
10  
IN  
3
2
7
FULL-WAVE  
RECTIFIED  
OUTPUT  
A3  
C4  
1μF  
2V p-p  
<2kHz  
1/2  
1
A2  
OP291  
R10  
1Mꢀ  
4
A1  
V
B
HALF-WAVE  
RECTIFIED  
OUTPUT  
Figure 72. A 3 V Single-Supply, 50 Hz/60 Hz Active Notch Filter  
with False Ground  
1V  
500mV  
V
IN  
Amplifier A3 is the heart of the false ground bias circuit.  
It buffers the voltage developed by R9 and R10 and is the  
reference for the active notch filter. Because the OP491  
exhibits a rail-to-rail input common-mode range, R9 and R10  
are chosen to split the 3 V supply symmetrically. An in-the-loop  
compensation scheme used around the OP491 allows the op  
amp to drive C6, a 1 μF capacitor, without oscillation. C6  
maintains a low impedance ac ground over the operating  
frequency range of the filter.  
100  
90  
(1V/DIV)  
V
A
OUT  
(0.5V/DIV)  
10  
0%  
V
B
OUT  
(0.5V/DIV)  
500mV  
TIME (200μs/DIV)  
200μs  
Figure 73. Single-Supply, Half-Wave, and Full-Wave Rectifiers  
Using an OP291  
Rev. D | Page 22 of 24  
 
 
 
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