OPA861IDBVRG4

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OPA861IDBVRG4 is a precision high-speed Instrumentation Amplifier (INAMP). It is a silicon monolithic integrated circuit with a voltage gain up to 10 V/V, operating from a single supply voltage as low as 2.7 V and consuming only 2 mW/channel of power. It provides high accuracy and bandwidth, low noise, and high input input overvoltage protection. The OPA861IDBVRG4 is ideal for applications in audio, communications, and many other fields where high precision and low-power consumption are required.

Application Field: OPA861IDBVRG4 is applicable in various fields like medical instrumentation, telecom, power measuring instruments, strain gauge amplifiers, bioelectric work and in test and measurement systems. OPA861IDBVRG4 is suitable for AC and DC coupling applications, due to its differential input voltage capability. It is particularly suitable for applications requiring fast settling times and low input bias current.

Working Principle: OPA861IDBVRG4 consists of a differential input stage, an inverting gain stage, an output stage, and an ESD protection circuit. The differential input stage consists of two junction field effect transistors (JFET) connected as trans-conductance amplifiers. The JFETs operate together with a large load resistor and a small shunt capacitor. This creates a gain response with a flat frequency response and low input capacitance, which makes the device ideal for high-speed applications. The inverting gain stage is composed of an operational amplifier configured as a summing amplifier and a resistive feedback network. This amplifier can be used to adjust the gain of the device to a desired value.

The output stage of OPA861IDBVRG4 is composed of a class-AB output buffer. This buffer is used to reduce the output impedance of the amplifier and to provide a low output voltage offset error over temperature. The ESD protection circuit provides protection against electrostatic discharges, up to ±13 kV for HBM and ±8 kV for CDM.

OPA861IDBVRG4 is a low-power, high-accuracy, and wide-bandwidth device, making it suitable for many precision applications. The device is easy to use and requires less space than other comparable amplifiers, making it a good choice for various types of applications.

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