INA122PG4

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The INA122PG4 is a unity gain instrumentation amplifier that is used to measure small signals from transducers and sensors in a variety of applications. It is part of Texas Instruments\' family of low-power, low-cost instrumentation amplifiers. The INA122PG4 is suitable for a wide range of applications that require low-noise measurement of a signal with a low offset and low power.

The INA122PG4 features a single-ended DC-coupled input with a low orientation sensitivity. Integrated input buffer, instrumentation amplifier, precision filtering and drive control are integral features of the device. It also includes a precision gain-set resistor and output op-amp. With a current drain of only 3 mA, the INA122PG4 will provide a low-noise solution for any linear application.

The INA122PG4’s application field can include instrumentation, medical and industrial process monitoring, test and measurement, and audio systems. Its wide input common-mode range and its ability to squeeze a great dynamic range out of low power are features that are advantageous in multiple applications.

The working principle of the INA122PG4 is based on the classic operation of an instrumentation amplifier. The input is two voltage sources, referenced to a common ground, which is amplified by an offset-nulling amplifier. The amplifier is composed of two amplifiers in a differential configuration and an output stage made of an op-amp.

The amplifier’s gain is determined by the value of the gain-set resistor, which depends on the input signal level. To make sure that the amplifier does not drift after initial calibration, the gain-set resistor is provided with on-chip trimming. This trimming process is performed to guarantee the device’s noise and offset specifications.

The INA122PG4 has a wide bandwidth, with a gain-bandwidth product up to 3 MHz. It is therefore able to accurately reproduce fast signals, while input noise is minimized thanks to the advanced integrated filters. The device has a high slew rate of 10 V/μs, allowing it to respond quickly to overloads.

The low noise level (25 μV peak to peak) of the INA122PG4 guarantees a high dynamic range even in the presence of low signal levels. When the gainsetting is adjusted correctly, the amplifier is able to accurately track both large and small signals.

The INA122PG4 is designed for low voltage operation, operating from a single 2.5 V supply. Its low power consumption (3 mA typical) makes it suitable for battery powered and portable applications. Its low power consumption further helps to extend the life of the battery.

The INA122PG4 is a fully differential, low-noise instrumentation amplifier, suitable for highly accurate, low-power applications. It is part of a family of low-power, low-cost instrumentation amplifiers offered by Texas Instruments, making it an ideal choice for a variety of signal measurement applications.

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