PGA112EVM Development Boards, Kits, Programmers

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The PGA112EVM application is designed to evaluate the Texas Instruments’ PGAs used for low power, low voltage audio applications. It consists of an analog signal path, a digital control path, and an integrated signal conditioner for measuring the oscillator frequency of the connected device. This evaluation module is particularly suited for applications such as audio, instrumentation, and medical applications.

The PGA112EVM has a few features that stand out from other Evaluation Boards on the market. Firstly, the integrated signal conditioner is used to measure the oscillator frequency, rather than using an external source. This reduces both cost and complexity. Secondly, the module is powered from a single rail, making it well suited for use in applications such as portable devices. Lastly, the module comes preloaded with the TI’s PGA104 and PGA106EVM enhanced software support.

The PGA112EVM application uses a dual power supply architecture. The input amplifier is powered by a 5V power supply source and the output amplifier is powered by an independent power source. The power supply source is used for both controlling the analog and digital circuitry, and also providing the power for the PGA112EVM. Similarly, the output amplifier is powered by a separate power source, which is used for output conditioning.

The analog signal path of the PGA112EVM is based on a two-stage design. The first stage is the input amplifier, which takes the signal from the test device and provides amplification as well as protection against undesired noise. The second stage is the output amplifier, which applies the desired gain and provides additional protection against noise interferences.  The gain of the output amplifier is typically set by a resistor connected to the input node. 

The digital control path of the PGA112EVM allows users to control the gain of the input amplifier as well as the gain of the output amplifier. The input amplifier gain is controlled by the digital control port, while the output amplifier gain is adjusted by the resistor connected to the input node. The digital control port allows the user to select any of the predefined gain settings, or to manually adjust the gain setting.

The integrated signal conditioner for the PGA112EVM is a small circuit board used to measure the oscillator frequency of the connected device. The signal conditioner is connected to the input side of the evaluation board, and it measures the frequency of the oscillator connected to the board. The measured frequency is then used to calculate the total gain and gain equation of the input device.

In conclusion, the PGA112EVM is a great tool for low power, low voltage audio applications. The dual power supply architecture provides both amplification and protection against noise that can interfere with the circuitry. The integrated signal conditioner is used to measure the oscillator frequency of the connected device, reducing cost and complexity. The digital control port makes it easy to adjust and customize the gain settings. The PGA112EVM is a great tool for those looking for a reliable and efficient solution to their audio applications.

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