AD7790BRM

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Data acquisition is the process of sampling signals that measure real world physical conditions and converting the resulting samples into digital numerical values that can be manipulated by a computer. Analog to digital converters (ADCs) are the most common data acquisition component used to perform this conversion. The AD7790BRM is an 8-bit successive approximation register (SAR) analog-to-digital converter that is suitable for a wide variety of applications. This application note will provide an overview of AD7790BRM\'s application field and working principle.

AD7790BRM Application Field

The AD7790BRM is an 8-bit, low power, SAR analog-to-digital converter (ADC) designed to provide superior performance on single-supply, power-sensitive applications. Its operating temperature range is -40ºC to +125ºC, making it suitable for use in extended temperature ranges. Its low power consumption of only 1 mW allows for battery-powered applications. The AD7790BRM offers highspeed conversion with a conversion time of 183 µs and a throughput of 850 kSPS. Additionally, it has an input range of ±4 V making it suitable for a wide variety of single-supply signal ranges. With an NJU8715 noise-reduction D/A converter and ESD protection, it provides high accuracy and accuracy stability for industrial control and measurement applications, such as transducer signal conditioning, process control and temperature measurement.

AD7790BRM Working Principle

The AD7790BRM uses a successive approximation register (SAR) type analog-to-digital converter design with a 6uV offset, 0.7uV noise, and 16 bit resolution over a ±4V input range. The SAR uses a patented autoranging technique to allow a single-ended signal with positive or negative polarity to be converted with full resolution. The 8-bit SAR uses 8 cycles to convert an analog input signal to digital, with each cycle consisting of two steps: a digital-to-analog (D/A) conversion and a comparison. The D/A conversion is accomplished by a NJU8715, noise-reduction D/A converter, which is powered from the same supply as the AD7790BRM. The D/A converter is reset between each conversion cycle to ensure no residue voltage remains in the circuit. The differential comparator measures the difference between the D/A output voltage and the analog input voltage; comparison results are then fed back to the successive approximation register.

The output of the SAR is the digital representation of the analog input. The output is available asynchronously and is automatically latched into the output register on the falling edge of the CS signal. Additionally, the AD7790BRM has an integrated auto-zero circuit, which uses a one-time calibration procedure to remove offset during startup, allowing for high accuracy throughout the entire conversion range. The AD7790BRM can be powered down to reduce power consumption when idle, or it can stay in the full power mode for higher throughput or higher resolution.

Conclusion

The AD7790BRM is a low-power, 8-bit, successive approximation register (SAR) analog-to-digital converter suitable for a variety of data acquisition applications. It provides superior performance for single-supply, power-sensitive applications, with a conversion time of 183 µs and a throughput of 850 kSPS. It has an NJU8715 noise-reduction D/A converter and ESD protection, providing high accuracy and accuracy stability for industrial control and measurement applications. The SAR uses an autoranging technique and an integrated auto-zero circuit for higher efficiency, and it also offers a low power-down mode for power savings when idle. The AD7790BRM is an ideal solution for transducer signal conditioning, process control, and temperature measurement applications.

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