ADS7863ARGET

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Data Acquisition is an important component of any program that aims to collect information about the environment and surroundings. Analog to Digital Converters (ADC) play a critical role in data acquisition because they convert analog signals into digital ones, which can be manipulated and analyzed much more easily. The ADS7863 is one such ADC that has gained popularity in the industry for its various features and capabilities. This article will explore the range of applications for the ADS7863 and its underlying working principle.

Overview of Applications

The ADS7863 is a single chip, highly integrated charge transfer analog-to-digital (A/D) converter. It is used in a wide range of high precision and high speed applications, such as automotive systems, medical ultrasound, ultrasound imaging, high-resolution and high-speed information acquisition and processing systems. In addition to its ability to interface with a variety of external system, the ADS7863 offers a range of other useful features, such as low power consumption, fast A/D conversion, excellent linearity, low noise, and very good dynamic performance.

The ADS7863 is suited for use in applications that require high performance A/D converter with low power consumption while retaining the precision of the analog input signal. It uses a 16-channel CMOS switched capacitor architecture to convert the analog inputs into a pulse width modulated digital signal. This makes the ADS7863 ideal for applications where high accuracy, resolution and speed are required. It is also ideal for applications requiring low power consumption, such as medical imaging and acoustic sensing.

The ADS7863 is highly preferred in automotive and medical applications due to its integrated features. It has a maximum sample rate of 750 KHz and is capable of resolving signals up to 16-bits. It has built-in hardware protection, high speed sample and hold, programmable bias current and self-calibration capabilities. The ADS7863 supports voltage range from 0 - 5 V and can provide outputs in a wide range of formats such as 8/10/12bit and 16bit, making it suitable for various applications in different industries.

Working Principle

The ADS7863 is a single-chip, high-precision, high-speed ADC with 16 bit resolution. It uses a switched-capacitor architecture to convert an analog signal into a pulse width modulated digital output. The core of the ADS7863 is a voltage-to-frequency converter (VFC). An internal period counter acts as a timer and allows the DAC to convert a voltage of up to 16-bits of accuracy, up to 750KHz. Each channel of the converter contains two capacitor arrays which, along with 1-kΩ conversion resistors, form an integrator with a feedback resistor.

The different steps involved in the conversion are as follows:

• In the first step, an input signal is applied across two sampling capacitors. This is known as the sampling phase.
• Next, the VFC adds the signal charge to the sampling capacitor by switching the sampling switch. This is known as the accumulation phase.
• Following that, the counter outputs a signal of fixed frequency and VFC operates in the quasimixture mode where it constructs a signal of frequency proportional to the voltage of the capacitor.
• Finally, the frequency is converted to a digital number with the help of a “quantizer”.

The quantizer is the key factor that allows the ADS7863 to provide a wide-range of output formats ranging from 8 to 16 bits when configured with the internal or external logic. This makes the ADS7863 a suitable choice for applications which require a precision output.

Conclusion

In conclusion, the ADS7863 is a well-designed, single-chip A/D converter. It is suitable for a wide range of applications, particularly those requiring high accuracy, resolution, speed, and low power consumption. It has a high sampling rate of up to 750KHz and excellent linearity. It is also highly programmable and supports voltage ranges from 0 - 5V. Its switched-capacitor architecture makes it capable of resolving signals up to 16 bits. This makes it an ideal choice for applications requiring precision and performance.

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