OP177GS

Current - Input Bias:	1.2nA
Base Part Number:	OP177
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Voltage - Supply, Single/Dual (±):	6 V ~ 36 V, ±3 V ~ 18 V
Current - Supply:	1.6mA
Voltage - Input Offset:	20µV
Series:	--
Gain Bandwidth Product:	600kHz
Slew Rate:	0.3 V/µs
Output Type:	--
Number of Circuits:	1
Amplifier Type:	General Purpose
Part Status:	Obsolete
Packaging:	Tube

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Introduction

OP177GS is a high precision operational amplifier (Op Amp) which stands out due to its capabilities of achieving low distortion, low noise and low offset voltage. It features a very low operating current of 130uA, making it ideal to be used in applications in which battery lifetime needs to be considered.The OP177GS can be employed for the most varied applications, featuring an output voltage range of +/- 5V, a gain of up to 600 V/V and frequency response of GBW of 15MHz, making it very diverse in what it can do. It also features a high common mode rejection ratio of 100dB. All these factors make it a very versatile Op Amp suitable for different types of applications, with instrumentation, linear and buffer amplification being some of them.

Application Field

Due to its high precision nature, the OP177GS is an excellent choice for instrumentation applications, where high accuracy is required. One of its key features for such applications is its low offset voltage of 0.5mV, combined with its low input offset current of 0.3uA. Also, its wide bandwidth of 15MHz enables it to be used for most applications, ranging from filtered and sampled data systems, to active analog filters and data acquisition systems. It is also well suited for linear amplification in low noise designs, featuring a high common mode rejection ratio of 100dB. The wide voltage range of outputs (+/- 5V) makes it perfect for designing switching connection systems. It can also be used for driving high impedances, as evidenced by its low output resistance of 0.1 ohm.The OP177GS is also widely used as a buffer amplifier, connecting low output circuits to higher input impedance systems. As a buffer, it offers excellent device matching characteristics and high accuracy, making it ideal for producing low distortion outputs.

Working Principle

The OP177GS is an integrated circuit (IC) with many components capable of achieving the already mentioned characteristics. It includes an operational amplifier, an input stage with metal oxide semiconductor field effect transistors (MOSFETs), a pair of pnp transistors in the output stage and a power-off protection circuit. The operational amplifier works in a very reliable way. It is designed to maximize the input signal, by amplifying it in such a way that noise and distortion are reduced. It does this by applying negative feedback between the input signals, and then comparing it with a voltage reference. Feedback allows for operation to and from the same range of voltages, providing the amplifier with improved accuracy.The input configuration is the first line of defense against the noise produced by the circuit. Gain-boosting pnp transistors reduce the effect of the external noise, while the MOSFET connected sources minimize further the effect of the noise and provide an additional independent ground. The output circuit features a pair of pnp transistors, which give it high output drive capability. Their function is to amplify the input current and provide a high voltage output, independent of the load conditions.The OP177GS also features a power-off protection circuit which is responsible for providing a very low standby power consumption (down to 130uA) and preventing any unwanted current when the power is turned off. This circuit uses an analog switch so that the operating current is reduced to a minimum when the power is not applied.

Conclusion

The OP177GS is a high precision operational amplifier designed to be used in different applications, such as linear amplification, instrumentation, buffer amplification and other tasks. It stands out for its low noise, low distortion and low offset voltage design, low operation current and its wide voltage output range (+/- 5V). Its components are designed to ensure maximum reliability and accuracy. It is an ideal choice for the most versatile applications.

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