AD7820KP

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AD7820KP Application Field and Working Principle

Data acquisition, or DA, refers to the operation of converting a quantity (measured of physical or electrical origin) into a digital signal or value. Analog-to-digital converters (ADCs) are primary components in data acquisition systems, essential for converting analog into digital signals. The AD7820KP ADC, or Successive Approximation Register (SAR) ADC, is one such example of a high-performance and reliable ADC used in a variety of applications.

The AD7820KP is a CMOS, 12-bit SAR ADC capable of sampling at data rates up to 40 MSPS. The device offers high-performance, good linearity, and a wide power supply range (2.7V–5.5V for single supply), making it suitable for a wide range of applications including cellular basestations, medical imaging systems, instrumentation, SATCOMS, communications, and industrial control.

Working Principle

SAR ADCs are among the most popular and cost-effective types of ADCs. They convert an analog input signal into a digital equivalent by successively approximating the analog input to the digital output. Conversion is accomplished in a “successive approximation process,” where the magnitude of the analog input signal is compared to a reference voltage one bit at a time. This comparison is done in stages, and a logic 1 or 0 is assigned to each bit depending on whether or not the reference voltage is greater than or less than the input signal.

The AD7820KP implements high-speed SAR architecture which is based on the most significant bit (MSB) first. This architecture allows for very fast throughputs without sacrificing accuracy. The AD7820KP also incorporates a 3-bit coarse digital-to-analog converter (DAC) and 9-bit fine DAC. The MSB comparator uses a 3-bit coarse DAC that samples the voltage after a single SAR cycle. The remaining bits follow the MSB to reduce the overall SAR search time. The AD7820KP also features an on-chip reference, allowing the user to set the full-scale input range to any value between 0V and 2.5V.

Features and Benefits

The AD7820KP features a wide operating temperature range (–40°C to +85°C) to ensure reliable operation in a variety of industrial and consumer applications. It is also small, with a 16-pin SSOP package measuring just 4mm x 4mm x 0.85mm. This provides an ideal solution for space-constrained applications.

In addition, the AD7820KP has a power shutdown feature that offers more than a 75% reduction in power consumption when compared to the regular operating mode. This allows for increased battery life and low-power operation.

Another advantage of the AD7820KP SAR ADC is its fast throughput. The device is capable of converting at sample rates up to 40 MSPS, allowing for high-performance data acquisition. In addition, its low-power window comparator architecture allows the user to reduce sampling time by as much as 64x while maintaining the same accuracy.

Finally, the AD7820KP has a wide power supply range of 2.7V to 5.5V, making it perfect for portable and/or battery-operated applications. It is also highly immune to power supply noise, allowing for reliable operation.

Conclusion

The AD7820KP is a versatile 12-bit SAR ADC with a wide power supply range, high-speed sample rate, and low power consumption. It is suitable for a variety of applications, from cellular basestations to instrumentation, SATCOMS, and industrial control. With its features and benefits, the AD7820KP is an ideal choice for a variety of data acquisition applications.

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