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OP4177ARZ1 参数 Datasheet PDF下载

OP4177ARZ1图片预览
型号: OP4177ARZ1
PDF下载: 下载PDF文件 查看货源
内容描述: 精密,低噪声,低输入偏置电流运算放大器 [Precision Low Noise, Low Input Bias Current Operational Amplifiers]
分类和应用: 运算放大器
文件页数/大小: 24 页 / 479 K
品牌: ADI [ ADI ]
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OP1177/OP2177/OP4177  
V
= ±15V  
V
SY  
=
10V  
SY  
R
= 2kΩ  
A
V
= 1  
L
V
IN  
V
OUT  
OPA277  
TIME (400µs/DIV)  
(5V/DIV)  
Figure 53. No Phase Reversal  
Figure 52. Gain Linearity  
SETTLING TIME  
INPUT OVERVOLTAGE PROTECTION  
Settling time is defined as the time it takes an amplifier output  
to reach and remain within a percentage of its final value after  
application of an input pulse. It is especially important in measure-  
ment and control circuits in which amplifiers buffer ADC inputs  
or DAC outputs.  
When input voltages exceed the positive or negative supply  
voltage, most amplifiers require external resistors to protect  
them from damage.  
The OPx177 has internal protective circuitry that allows voltages as  
high as 2.5 V beyond the supplies to be applied at the input of  
either terminal without any harmful effects.  
To minimize settling time in amplifier circuits, use proper  
bypassing of power supplies and an appropriate choice of circuit  
components. Resistors should be metal film types, because they  
have less stray capacitance and inductance than their wire-wound  
counterparts. Capacitors should be polystyrene or polycarbonate  
types to minimize dielectric absorption.  
Use an additional resistor in series with the inputs if the voltage  
exceeds the supplies by more than 2.5 V. The value of the resistor  
can be determined from the formula  
(
VIN VS  
RS + 500 Ω  
)
5 mA  
The leads from the power supply should be kept as short as  
possible to minimize capacitance and inductance. The OPx177  
has a settling time of about 45 ꢀs to 0.01% (1 mV) with a 10 V  
step applied to the input in a noninverting unity gain.  
With the OPx177 low input offset current of <1 nA maximum,  
placing a 5 kꢁ resistor in series with both inputs adds less than  
5 ꢀV to input offset voltage and has a negligible impact on the  
overall noise performance of the circuit.  
OVERLOAD RECOVERY TIME  
Overload recovery is defined as the time it takes the output  
voltage of an amplifier to recover from a saturated condition to  
its linear response region. A common example is one in which  
the output voltage demanded by the transfer function of the  
circuit lies beyond the maximum output voltage capability of  
the amplifier. A 10 V input applied to an amplifier in a closed-  
loop gain of 2 demands an output voltage of 20 V. This is beyond  
the output voltage range of the OPx177 when operating at 15 V  
supplies and forces the output into saturation.  
5 kꢁ protects the inputs to more than 27 V beyond either supply.  
Refer to the THD + Noise section for additional information on  
noise vs. source resistance.  
OUTPUT PHASE REVERSAL  
Phase reversal is defined as a change of polarity in the amplifier  
transfer function. Many operational amplifiers exhibit phase  
reversal when the voltage applied to the input is greater than the  
maximum common-mode voltage. In some instances, this can  
cause permanent damage to the amplifier. In feedback loops, it  
can result in system lockups or equipment damage. The OPx177  
is immune to phase reversal problems even at input voltages  
beyond the supplies.  
Recovery time is important in many applications, particularly  
where the operational amplifier must amplify small signals in  
the presence of large transient voltages.  
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