EVAL-AD7194EBZ

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Evaluation Boards - Analog to Digital Converters (ADCs) are designed to test the performance of the Analog to Digital Converters (ADCs) and the circuits they are used in. One such ADC is the EVAL-AD7194EBZ (evaluation board from Analog Devices). This board is designed for testing the performance of the AD7194 12-bit Analog to Digital Converter. The application field and the working principle of the EVAL-AD7194EBZ ADC are explained in this article.

The EVAL-AD7194EBZ is designed for use in applications requiring low-noise, high-resolution signal acquisition. It is highly integrated and suitable for applications such as testing, measuring, and control. As an ADC it is also suitable for medical, consumer, and industrial applications. Applications include high-sample-rate data acquisition, data logging, and remote sensing.

The EVAL-AD7194EBZ is an integrated solution for the AD7194 ADC. It includes an integrated single-supply 18V to 5V voltage regulator, an on-board 4A switching regulator, and an enhanced EMI filter. This allows for easier direct interface into the target system. It also includes a comprehensive selection of input, output, and reference voltage levels, allowing for the optimum configuration for the desired application. Additionally, the EVAL-AD7194EBZ board features a 1024-byte EEPROM and an on-board USB to serial interface, allowing for easy PC programming and communication. Finally, the package includes a USB cable and all necessary software.

The working principle of the EVAL-AD7194EBZ is based on the AD7194 ADC. The AD7194 is a 12-bit successive approximation analog to digital converter with integral nonlinearity (INL) of ± 0.15 largest count, differential nonlinearity (DNL) of ± 0.06 largest count, and a throughput rate. It features a 70µs conversion time and a selectable-gain-inverter for the input signal. The ADC is based on a charge redistribution (CR) architecture and performs analog to digital conversion by sequentially comparing the input voltage to an increasing voltage ramp. The comparison search is performed by sequentially selecting a corresponding number of bits from the output of the previous acquisition.

The EVAL-AD7194EBZ board supports four input ranges: ±3V, ±1.5V, ±0.75V, and ±0.375V. It also supports a wide range of input and reference resistors, allowing for the optimum SNR performance for the desired application. An adjustable 5V reference voltage can be provided via an external source or an on-board 2.5V reference can be used. An on-board analog-to-digital converter provides a temperature-sensing accuracy of ± 2°C. Finally, the package includes a two-wire operating-mode toggle switch, which allows user-selectable operation in either single-conversion or continuous-conversion mode.

In summary, the EVAL-AD7194EBZ is a highly integrated evaluation board for testing the performance of the AD7194 12-bit ADC. It includes an integrated single-supply voltage regulator, an on-board switching regulator, an enhanced EMI filter, a 1024-byte EEPROM, and a USB to serial interface. Additionally, it supports four input ranges, adjustable 5V reference voltage, and a two-wire operating-mode toggle switch, which allows user-selectable operation in either single-conversion or continuous-conversion mode. The ADC is based on a charge-redistribution architecture which performs analog-to-digital conversion by sequentially comparing the input voltage to an increasing voltage ramp. The board is suitable for testing, measuring, and control applications, and for use in medical, consumer, and industrial applications.

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