EVAL-AD7995EBZ

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Analog-to-Digital converters (ADCs) are typically used in electronic systems that require a precise conversion of an analog signal to a digital one for monitoring, control, or communication purposes. An Evaluation Boards - Analog to Digital Converters (EVAL-AD7995EBZ) is intended to assist users to evaluate the performance of a family of ADCs for a variety of applications. This article will discuss EVAL-AD7995EBZ application field and working principle.

Overview

The EVAL-AD7995EBZ evaluation board features the AD7995, an 8-bit, 5 MHz analog-to-digital converter, designed and manufactured by Analog Devices (ADI). It is a 2-channel sampling ADC which delivers low-power, low-noise performance across a wide range of temperature and process variations. Contrasting to traditional ADC\'s, the AD7995 features a flexible synchronous interface, providing designers with an alternate choice of implementing, and is compliant with standard serial communication protocols such as SPI, I2C, and UART.

The EVAL-AD7995EBZ evaluation board has been designed to enable users to gain insight into the characteristics of the AD7995 and enable users to quickly and accurately characterize the device in the intended system environment. It is designed to be used with the standard 5V functions of the AD7995 and features an R-C filter, reset circuit, voltage regulator, and level shifting circuit. The board is designed to allow users to configure the AD7995 for a single-channel or two-channel operation.

Application Fields

The EVAL-AD7995EBZ is suitable for a range of different applications, including:

• Data acquisition systems
• Industrial and process control systems
• Communication systems
• Automotive systems
• Sensor applications
• Portable and handheld devices

Working Principle

The core of the EVAL-AD7995EBZ board is the Analog Devices AD7995, an 8-bit, 5 MHz analog-to-digital converter. The AD7995 is a low-power, low-noise, synchronous sampling ADC with a comprehensive range of inputs, outputs, and interfaces. It has a wide input range from −2V to +2V to support a variety of sensor interfaces, as well as input ranges up to 5V for general-purpose applications. The AD7995 converts the analog input voltage to an 8-bit digital output code in 5 μs and can convert up to two channels simultaneously. The board has two analogue input channels, each with an internal switch for either single- or dual-channel operation.

In single-channel operation, the internal switch is opened, connecting the input signal directly to the input of the AD7995. In dual-channel operation, both the input signals are selected via a single internal switch and an avdd voltage reference is connected between the two inputs. The reference voltage is used by the AD7995 to ensure that the input voltage ranges of both channels are matched, resulting in a higher accuracy of conversion.

The EVAL-AD7995EBZ can be powered with standard 3V and 5V supplies. The voltage regulator and the level shifting circuit on the board allow for powering the board with a single 5V supply. The board provides a USB connector for communicating the digital output results with a host controller and a push-button for enabling the users to start updating the ADC registers. The board also provides several jumpers and switches for controlling the operation of the AD7995.

Conclusion

The EVAL-AD7995EBZ evaluation board provides a powerful platform for evaluating the performance of the AD7995 in various system applications. It offers users a wide range of features to allow for easy integration into existing systems. The flexible design of the board also allows user to easily configure the board for single- or dual-channel operation.

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