AD7678ASTZRL

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The AD7678ASTZRL is a high-speed, 12- bit, low-power, and single-supply CMOS analog-to-digital (A/D) converter that belongs to the category of data acquisition analog to digital converters (ADC). It has multiple applications and is specifically designed to provide industry-leading performance while consuming minimum power. In this article, we discuss the application fields and working principles of the AD7678ASTZRL.

Application Fields

The AD7678ASTZRL is suitable for various applications such as consumer, industrial, and medical instrumentation, automobiles, power management, communications equipment, among others. The versatile design of this ADC simplifies its integration into almost all systems with minimal effort. The AD7678ASTZRL offers high analog input bandwidth, low power mode operation, low power standby mode and excellent signal to noise ratio. It is also the ideal device for signal conditioning and signal processing.

The AD7678ASTZRL offers dual-channel, simultaneous sampling capability. It enables signal-conditioning techniques to be implemented with a single device, saving space and cost. It is capable of sampling boost and buck signals along with full-wave rectified signals and signals with slow varying offsets. It provides an effective solution for highly accurate and power efficient monitoring of power systems.

Working Principle

The AD7678ASTZRL operates on the same principles as other data acquisition analog to digital converters (ADC). It samples and quantizes analog input signals and then converts it into a digital word. An internal multiplexer selects one of the two analog input voltages as well as the internal reference voltage. The chosen signal then passes through the successive approximation (SAR) algorithm and then converted into a corresponding digital word.

The AD7678ASTZRL operates with an analog input voltage range of 0V to VREF. The VREF is the reference voltage for the ADC and its maximum value is 5.25V to 6V. The signal is then amplified to a suitable level using the programmable amplifier and passes through two signal path filters before it is digitized by the 12-bit SAR ADC.

This ADC uses a linear interpolation technique to reduce offset, noise and signal distortion. It also dynamically adjusts the sampling speed based on the signal level to minimize power consumption. The SAR algorithm continuously samples the signal until a full conversion is done. The digital output is then presented in 3-wire SPI or 2-wire I²C format.

Conclusion

The AD7678ASTZRL is a high-speed, low-power, single-supply CMOS A/D converter that belongs to the category of data acquisition analog to digital converters (ADC). It is suitable for various application fields such as consumer, industrial and medical instrumentation, automobiles, power management, and communications equipment. The working principle of this ADC is the same as other data acquisition ADC. It samples and quantizes analog input signals and then converts it into a digital word.

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