TL074Op-Amp (JFET Input)

23 June 2018 - 0 Comments

TL074操作AMP IC

TL074Op-Amp Pinout

TL074引脚配置

Pin Number	Pin Name	Description
1,7,10,16	Op-Amp Output Pins	These are the output pins of the four Op-Amps
2,6,11,15	输入反转引脚	这些是四个操作放大器的输入反转引脚
3,5,12,14	Input Non-Inverting Pins	这些是四个操作放大器的输入非转移引脚
4	Vcc (+)	Positive Supply Rail of the Op-Amp
13	Vcc (-)	运算放大器的负电源轨

Features and Specifications

JFET Input Op-Amp Quad Package
典型的工作电压： +15V至-15V
最大工作电压：36V
Input Bias Current: 65pA
Common mode Rejection Ratio CMRR: 100dB
Low Level Input Voltage: 0.8V (max)
Propagation Delay (Pd) / Transition time: 29 ns (max)
低输入偏差和偏移电流
输出短路保护
可在14针PDIP，SO-14，具有TL74A，TL74AB，TL74AC和TL74L等变化的TSSOP软件包。

Note:Complete Technical Details can be found in theTL074IC datasheet在此页面末尾给出。

TL074等效

LM324

Alternatives Op-Amps

LM741A，LM741C，LM709C,LM201, MC1439, and LM748

Where to use TL074 IC

TheTL074是Quad软件包操作放大器, meaning it has four Op-Amps inside it and each Op-Amp can be used independently.

TL074Op-amp Inside

The main distinguishingfeature of the TL074 Op-Ampis that they incorporate high-voltageJFETand bipolar transistors which helps the transistor to have very high input impedance and low bias current. Also this Op-Amp has low noise and harmonic distortion making it an ideal choice for audio pre-amplifiers. So if you are looking for an Op-Amp IC with Quad package and JFET driven then this IC might be the right choice for you

How to use TL074 Op-Amp

TL074与LM324运算放大器非常相似，它们内部有四个操作放大器，并且具有完全相同的引脚。但是，由于TL074内部有JFET，因此它们的特性有所不同。如果您想了解此IC的申请电路很少，那么您可以阅读how LM324 is used由于两个IC都共享相同的应用程序。

TL074Op-Amp Design Considerations

我们知道，运算放大器是大多数电子电路设计的工作马。有大量的应用电路，用于操作通路每个具有其自身的特征和意义。但是每个Op-Amp designswill have some common design considerations or tips which are common among them and we will discuss the same further.

TL074Op amp Design Considerations

Inputs:Op-Amps are known for its high input impedance, meaning it will not draw any current (or disturb) the signal that is being given to the Input pin. The input stage of an Op-Amp is mostly complex since it involves many stages. The Input common-mode range value must be considered while supplying voltage signals because the input voltage should never exceed the rail voltage else it will create a latch-up condition which in return will create a short circuit of the supply voltage and thus damaging the circuit permanently. Also the difference between the voltage values of the Inverting and the Non-Inverting pin should not be more than the Differential Input Voltage Rating.

Output:The TL074 is not a rail to rail Op-Amp hence the output voltage will not reach the maximum positive or maximum negative voltage when saturated. It will always be ~2V less than the supply voltage, this voltage drop occurs because of the Vce voltage drop of the transistors present inside the Op-Amp. Also remember that a saturated Op-Amp will comparatively draw more current and thus results in power loss.

增益/反馈：Op-Amps are known for their very large Open-Loop Gain, but sadly this gain is accompanied by noise hence most of the circuits are designed using Closed-Loop. A Closed-Loop system provides feedback to the input this limiting the gain value of the Op-Amp and the noise associated with it. A Negative feedback is commonly preferred, since it has predictable behaviour and stable operation.

Terminating Unused Op-Amp pins

For ICs likeTL074它具有Quad Op-Amp样式的包装，通常很有可能设计不利用所有可用的四个操作装置。在这种情况下，正确终止未使用的操作AMP非常重要。否则，未使用的引脚会产生一些可能吸收噪音并影响性能的停留电容，而且非终止操作放大器也会消耗更多的功率，从而降低设计效率。有很多方法可以根据您的设计终止运算放大器，但最常用的方法如下所示。

终止未使用的运算放大器

这里的操作装置在电压范围V之间运行_dd和v_ss。为了终止操作AMP，OP-AMP的反相引脚连接到输出引脚，并配有恒定电压源。该恒定电压可能具有任何值，但必须在电源电压（公共模式电压范围）的范围内。因此，没有这两个电阻不是强制性的，因为该特定范围的任何可用电压都可以用于终止运算放大器的非转换引脚。