AD574AKE

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AD574AKE Application Field and Working Principle

The AD574AKE is an 8-bit Analog to Digital Converter (ADC) consisting of a successive approximation register (SAR), input amplifier, reference/voltage divider and output latch. It is designed to be used in systems that require sampling of analog signals at an 8-bit resolution and at fast conversion speeds of up to 115 ksps. It is used in several applications such as automotive, industrial, portable and communication systems.

The microchip incorporates a pulse width modulator and a 3-bit SAR logic circuit for ADC conversions and is designed for low power consumption and high accuracy. Signal linearity is improved through the use of internal offset and gain corrections, resulting in representation of an analog input from -VREF/2 to VREF/2.

Data Acquisition - Analog to Digital Converters (ADC)

An ADC converts an analog signal into a digital representation used by computers or similar digital systems. AD574AKE is one of the many Analog to Digital Converters with 8-bit resolution.

Working Principle

The AD574AKE operates using the successive approximation technique. It compares the input voltage with successive digital reference voltages held within the ADC. Each reference voltage represents one bit of the result. The process will conclude when all bits are determined.

The process begins with all bits of the result reset to a known state (usually 0). The comparator then compares the input voltage (Vin) to the reference voltage held within the ADC register. If the input voltage is less than the reference voltage, the bit is set to 0. If the input voltage is greater than the reference voltage, the bit is set to 1. This comparison is then repeated for each succeeding bit until the last bit is set.

The AD574AKE has a 3-bit SAR logic circuit that compares the input voltage to the reference voltage and increments (or decrements) the SAR resulting in digital code at the outputs. The SAR also keeps track of the result of the comparison process in digital code. This process continues until all 8 bits are obtained.

Features

• Input voltage range from -VREF/2 to VREF/2
• Operates from a single power supply
• Low power consumption (<1mW)
• High accuracy (16 LSB 0.5% typical)
• Termination options of single-ended or differential
• 8-bit resolution
• Fast conversion speed (115 ksps)
• Enable and signal conversion functions
• Programmable reference voltage
• Linearity improved through internal offset and gain correction

Conclusion

The ADC has been designed for use in various applications, including automotive, industrial, portable and communication systems. It is specifically designed for low power consumption, high accuracy and fast conversion speeds and is capable of representing an analog input from -VREF/2 to VREF/2.

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