ADS7887EVM

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Analog to Digital Converters (ADCs) are used in numerous applications for accurate signal conversion. One of the most used and efficient ADCs is the Texas Instruments ADS7885/ADS7887 family of devices, as they offer high accuracy and wide dynamic range for performance. This is why there is a high demand for evaluation boards such as the ADS7887EVM for testing and troubleshooting ADC systems. This article will discuss the application field and working principle of the ADS7887EVM boards for Analog to Digital Conversion.

Application Fields of ADS7887EVM

The ADS7887EVM evaluation boards are designed specifically for the Texas Instruments ADS7885/ADS788 family of converters. These types of converters are designed for time critical applications such as medical imaging, aerospace, and automotive. The evaluation boards are used to develop and troubleshoot these types of time critical applications with the use of the ADS788 converter. The board offers high accuracy and wide dynamic range performance, making it ideal for testing the performance of different radiation management systems. The board also offers integration with other devices such as an RS-232 serial port for control and communications, and support for I2C/SPI for use with external control systems.

Working Principle of ADS7887EVM

The ADS7887EVM evaluation boards offer high accuracy and wide dynamic range for performance. The board can convert analog signals to digital signals using the ADS788 chip. It is capable of sampling up to 1.25 Msps with an input range of 0.5 to 2.5V. The board also has the ability to store up to four 16 bit conversion results in its internal memory. The board works by first amplifying the analog signal using a programmable gain amplifier (PGA) before it is converted to a digital signal using a pipeline A/D converter.

The pipeline architecture of the board allows it to achieve a wide dynamic range. This is done by the A/D converter providing a certain number of bits of precision per stage. As each stage is processed, the output of the preceding stage is connected to the succeeding stage, ensuring a clean signal for the conversion. Each stage of the pipeline A/D converter has its own analog to digital conversions resulting in a high accuracy of results.

The input signal is then sent to the decimation filter which is used to reduce the samples per second from 1.25 MSps to a lower rate. This is done to reduce the noise that can be generated by the sampling. After the decimation filter the output can then be converted to an 8-bit or 12-bit digital signal. The digital signal is then sent to the output pip for output.

Conclusion

The Texas Instruments ADS7885/ADS7887 family of converters are popular for their high accuracy and wide dynamic range. The evaluation board, ADS7887EVM, is the perfect tool for testing and troubleshooting these types of converters. The board offers integration with other devices, such as an RS-232 serial port for control and communications, and supports I2C/SPI for use with external control systems. The board also works by first amplifying the analog signal using a PGA before it is converted to a digital signal using a pipeline A/D converter. The board also has the ability to store up to four 16-bit conversion results in its internal memory. The ADS7887EVM evaluation board is a powerful and reliable tool for testing and troubleshooting the Texas Instruments ADS7885/ADS7887 family of converters.

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