OP4177AR

Voltage - Input Offset:	15µV
Base Part Number:	OP4177
Supplier Device Package:	14-SOIC
Package / Case:	14-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Voltage - Supply, Single/Dual (±):	5 V ~ 36 V, ±2.5 V ~ 18 V
Current - Output / Channel:	10mA
Current - Supply:	400µA
Series:	--
Current - Input Bias:	500pA
Gain Bandwidth Product:	1.3MHz
Slew Rate:	0.7 V/µs
Output Type:	--
Number of Circuits:	4
Amplifier Type:	General Purpose
Part Status:	Obsolete
Packaging:	Tube

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OP4177AR Application Field and Working PrinciplesThe OP4177AR is a single-supply, low-power, rail-to-rail instrumentation amplifier intended for a variety of applications such as industrial process control systems, for distance measurement, for data transducers, for optical measuring devices, for laboratory experiments, and for small-signal measurement and amplifying in portable applications. This device features the high input impedance and the low input bias currents characteristic of the bipolar junction transistor (BJT) and the high slew rate and high output drive capability of a JFET.The OP4177AR includes two internal JFET input operational amplifiers and one BJT output driver. It can accept a range of power supplies from ¿2.2 to ¿18 V, and can be operated with a single power supply or with a split power supply.The OP4177AR is suitable for operation in applications requiring high performance and low power with minimal external components. It is ideal for applications where the highest level of accuracy is required in signal processing.The OP4177AR also offers its users various protection features such as current limiting, thermal protection, over-voltage protection, and electrostatic protection. It offers a wide common-mode range of -VCC to VCC and an output that can swing rail-to-rail (within 0.2V of the supply rails). It also features a low-voltage, low-power consumption, and low distortion characteristics.The OP4177AR is an ideal choice when precision and low power consumption are essential. It provides a low-noise, low-cost alternative to existing solutions, and can be used in a variety of high-performance applications. Working PrinciplesThe working principles of the OP4177AR are based on an input stage and an output stage. The input stage consists of two high-input impedance JFET input amplifiers and delivers a differential signal to the output stage. The output stage consists of a BJT current amplifier which boosts the signal and drives the OP4177AR’s output to the desired voltage level.In the input stage, the input is applied to the -VCC and VCC rails. The JFET input transistors are matched by their parameters and are trimmed by the differential amplifier to compensate for any possible parameters mismatch. Each input transistor is biased to the common-mode input voltage to maintain the input offset voltage and provide a very stable gain.In the output stage, the output of the differential amplifier is buffered by a BJT driver. The output is then connected to the output rail which is referenced to the -VCC and VCC voltages (within 0.2 V of the supply rails). During operation of the OP4177AR, the amplified signal is converted from a differential signal to a single-ended signal at the output. This is done by summing the differential output with the common-mode signal. The resultant input is buffered by the BJT driver to drive the output voltage level. The output of the OP4177AR will have the same frequency and amplitude of the input signal and the output impedance is very low.ConclusionThe OP4177AR is an ideal choice for applications that require high performance and low power with minimal external components. This device offers its users the benefits of the high input impedance of a BJT and low input bias currents and the high slew rate and output drive capability of a JFET. It is suitable for operation in applications requiring high performance and low power with minimal external components. It offers a wide common-mode range, low-voltage and low-power consumption, and low distortion characteristics.

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