PGA204BP

PGA204BP Application Field and Working Principle

The PGA204BP is a monolithic, high-accuracy, two-channel, in-amp buffer amplifier from Texas Instruments. It is a high-performance device used in applications that require signal conditioning, signal amplification, and level shifting. The PGA204BP is specifically designed for high-resolution, low noise, and low power signal conditioning. It has a low power, wide bandwidth, and low offset voltage.

Features

• High-accuracy, two-channel in-amp buffer amplifier
• High-performance signal conditioning
• Low power, wide bandwidth, and low offset voltage
• Wide gain range (1 V/V to 1000 V/V in 1-V/V increments)
• High common-mode rejection ratio (CMRR) of 95 dB at DC and 80 dB at 1 kHz
• Low voltage noise of 6.8 nV/√Hz and low input bias current
• Low power consumption of 2.2 mW at 3V supply voltage
• Latch-protection capability for input overloads

Applications

The PGA204BP is used in many applications that require sensitive signal conditioning such as: medical imaging, ultrasonics, data acquisition and instrumentation, audio signal processing, and automotive subsystems, and robotics. It is ideal for applications that require low noise, low power, and high accuracy.

Working Principle

The PGA204BP is an in-amp buffer amplifier that amplifies and level shifts the signal of an instrument, allowing it to be sent to an ADC or DAC. It has a low input bias current, allowing it to be used in any type of application without introducing errors in the signal chain. The amplifier also provides a high common-mode rejection ratio (CMRR), enabling it to block out unwanted noise from the signal.

The device is powered by an on-chip regulator, and two operational amplifiers are used to amplify the input signal and level shift it. The input signal is first amplified by one amplifier and then level shifted by the other amplifier. The level shifted signal is then sent to a high-gain output stage. This stage provides high gain, wide bandwidth, and low offset voltage.

In addition to its signal conditioning capabilities, the PGA204BP also offers latch protection for input overloads. This is a unique feature that helps to protect the device from damage due to overvoltage or sudden changes in the signal.