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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  
FUNCTIONAL DESCRIPTION  
The OPx177 series is the fourth generation of Analog Devices,  
Inc., industry-standard OP07 amplifier family. OPx177 is a high  
precision, low noise operational amplifier with a combination of  
extremely low offset voltage and very low input bias currents.  
Unlike JFET amplifiers, the low bias and offset currents are  
relatively insensitive to ambient temperatures, even up to 125°C.  
For RS < 3.9 kꢁ, en dominates and  
n,TOTAL en  
e
For 3.9 kꢁ < RS < 412 kꢁ, voltage noise of the amplifier, the  
current noise of the amplifier translated through the source  
resistor, and the thermal noise from the source resistor all  
contribute to the total noise.  
Analog Devices proprietary process technology and linear design  
expertise has produced a high voltage amplifier with superior  
performance to the OP07, OP77, and OP177 in a tiny MSOP  
8­lead package. Despite its small size, the OPx177 offers numerous  
improvements, including low wideband noise, very wide input  
and output voltage range, lower input bias current, and complete  
freedom from phase inversion.  
For RS > 412 kꢁ, the current noise dominates and  
en,TOTAL inRS  
The total equivalent rms noise over a specific bandwidth is  
expressed as  
e n  
=
(
e n , TOTAL  
)
BW  
OPx177 has a specified operating temperature range as wide as  
any similar device in a plastic surface-mount package. This is  
increasingly important as PCB and overall system sizes continue  
to shrink, causing internal system temperatures to rise. Power  
consumption is reduced by a factor of four from the OP177, and  
bandwidth and slew rate increase by a factor of two. The low  
power dissipation and very stable performance vs. temperature  
also act to reduce warmup drift errors to insignificant levels.  
where BW is the bandwidth in hertz.  
The preceding analysis is valid for frequencies larger than 50 Hz.  
When considering lower frequencies, flicker noise (also known  
as 1/f noise) must be taken into account.  
For a reference on noise calculations, refer to the Band-Pass  
KRC or Sallen-Key Filter section.  
Open-loop gain linearity under heavy loads is superior to compet-  
itive parts, such as the OPA277, improving dc accuracy and  
reducing distortion in circuits with high closed-loop gains.  
Inputs are internally protected from overvoltage conditions  
referenced to either supply rail.  
GAIN LINEARITY  
Gain linearity reduces errors in closed-loop configurations. The  
straighter the gain curve, the lower the maximum error over the  
input signal range. This is especially true for circuits with high  
closed-loop gains.  
Like any high performance amplifier, maximum performance is  
achieved by following appropriate circuit and PCB guidelines.  
The following sections provide practical advice on getting the  
most out of the OPx177 under a variety of application conditions.  
The OP1177 has excellent gain linearity even with heavy loads,  
as shown in Figure 51. Compare its performance to the OPA277,  
shown in Figure 52. Both devices are measured under identical  
conditions, with RL = 2 kꢁ. The OP2177 (dual) has virtually no  
distortion at lower voltages. Compared to the OPA277 at several  
supply voltages and various loads, OP1177 performance far  
exceeds that of its counterpart.  
TOTAL NOISE-INCLUDING SOURCE RESISTORS  
The low input current noise and input bias current of the OPx177  
make it useful for circuits with substantial input source resistance.  
Input offset voltage increases by less than 1 ꢀV maximum per  
500 ꢁ of source resistance.  
V
= ±15V  
SY  
R
= 2k  
L
The total noise density of the OPx177 is  
inRS  
2 + 4kTRS  
)
2
en,TOTAL = en +  
(
OP1177  
where:  
en is the input voltage noise density.  
in is the input current noise density.  
RS is the source resistance at the noninverting terminal.  
k is Boltzmann’s constant (1.38 × 10−23 J/K).  
T is the ambient temperature in Kelvin (T = 273 + temperature  
in degrees Celsius).  
(5V/DIV)  
Figure 51. Gain Linearity  
Rev. G | Page 14 of 24