OPA2703EA/2K5

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Introduction

OPA2703EA/2K5 is a dual channel, current feedback operational amplifier (op-amp). It is an ideal solution for instrumentation, buffer amplifiers and other linear applications. This article presents an overview of the OPA2703EA/2K5\'s application fields and working principle.

Application Field

OPA2703EA/2K5 is designed for a wide range of applications, such as active filter circuits, buffer amplifiers, summing amplifiers, and voltage followers. It is also ideal for high speed amplifier drives with high bandwidth, linearity, and slewing rates. The current feedback architecture adopted by OPA2703EA/2K5 supports fast settling-time and improved accuracy in applications with high gain precision. Its operation is guaranteed over a wide common-mode voltage range due to its differential input voltage configuration, making it suitable for voltage-controlled gain applications.

The dual-channel version of OPA2703EA/2K5 provides flexibility for applications requiring summing and difference-signal amplification. The common-mode rejection ratio is excellent due to the high input impedance, making the op-amp a suitable choice for applications with noisy environments.

Due to its relatively high slew rate and low supply current, the OPA2703EA/2K5 is suitable for bridge circuits for bridge sensor interface applications, as it can detect very small differences in full-bridge gains. Furthermore, the device includes a unity-gain stable voltage fund, enabling closed-loop gains up to 100 dB or a gain of 1000, making the op-amp suitable for applications that require high gain resolutions.

Working Principle

The OPA2703EA/2K5 utilizes a rail-to-rail input, an input voltage range extending up to the supply voltage, to allow an ideal operation with a strong signal close to the supply rail. The input terminals are typically referred to on the schematics as pins 1 and 8, while the output of the op-amp is signalized at pin 3 and the negative supply pin is usually labeled as 6. The OPA2703EA/2K5 is a complementary bipolar amplifier, using a single positive and single negative supply voltage and generally requires a capacitive or inductive bypass capacitor from each supply line at the op-amp’s supply voltage pin.

The input signal is amplified by a differential amplifier stage and compared to the inverting both the non-inverting input of the OPA2703EA/2K5. The non-inverting input is usually connected to a voltage reference (ground), while the differential amplifier stage amplifies the difference between the two inputs, rejecting the common-mode signal and amplifying the input voltage only when it varies from the reference voltage. The output of the differential amplifier is sent to a current-to-voltage converter which amplifies the current and sends it to the output of the OPA2703EA/2K5.

The OPA2703EA/2K5 have a number of protection mechanisms included in the design, those include: Offset protection: which protects against thermal drift, preventing any long term DC leakage; Input Protection: The amplifier includes protection against overvoltage in both the positive and negative supply rails; and finally, a Thermal Protection Circuit: which sense the temperature of the device and shuts it down in case of an over temperature condition.

Conclusion

The OPA2703EA/2K5 is a dual channel, current feedback operational amplifier designed for instrumentation, buffer amplifiers, and other linear applications. Its rail-to-rail input allows an ideal operation with a strong signal close to the supply rail, while the differential amplifier-current-to-voltage converter architecture provides excellent gain accuracy and speed. The high input impedance, high gain resolution and wide common-mode voltage acceptance make the op-amp suitable for a variety of applications, such as active filter circuits, summing amplifiers and voltage followers. Thermal and input protection circuits are integrated in the design, providing extra safety and reliability.

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