MCP3427T-E/UN

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Data acquisition is a term for the process of sampling signals that measure real world conditions and converting the resulting samples into digital numeric values that can be manipulated by a computer. Analog to Digital Converters (ADCs), or Analog-to-Digital Converter (ADC), is the critical component to translate the analog signal into the digital domain. The MCP3427T-E/UN is a high performance, single-channel AD converter that is powered and is highly integrated with a complete signal chain on a single chip.

MCP3427T-E/UN Application Field

The MCP3427T-E/UN offers an accuracy of 16 to 18 bits, depending on the settings and has a wide operaing range from 1V to 3.6V. With its ultra-low power consumption of 20-34µA, it is ideally suited for applications in process control, data acquisition and electronic test equipment. It can also be used in medical and consumer electronics such as digital hearing aids and glucose meters.

The MCP3427T-E/UN supports a range of different conversion rates and power modes, making it a flexible, low power solution for all kinds of data acquisition requirements. It also offers an adjustable gain amplifier, programmable filtering and a full scale range that is set by the user, enabling accurate and fine control of the signal.

MCP3427T-E/UN Working Principle

The MCP3427T-E/UN is a single-channel, low power ADC that uses an architecture that provides a high S/N ratio and very low distortion. At the heart of this ADC is a switched capacitor array (SCA) arranged in a Pseudo-differential configuration. This allows the ADC to digitize the input signal without the need for an external reference voltage or temperature compensation.

The MCP3427T-E/UN features two selectable bit accuracy modes; one mode allows for 16-bit resolution and the other for 18-bit resolution. Depending on the application, the mode can be chosen and adjusted with a low fixed sample rate using a single conversion command.

The MCP3427T-E/UN also supports a low power conversion mode, allowing the user to reduce the power consumption by automatically storing the converted data and switching off the converter during the conversion process. This is done by storing the converted data in an internal register, which can be read out at a later time.

The ADC also includes a wide range of programmable filtering options, allowing the user to select the desired filter bandwidth and shape, or to bypass the filter altogether. The filter settings can be adjusted by external capacitors or through a logic signal, allowing the user to dynamically adjust the filters.

In addition, an on-chip gain amplifier is also included for easy signal conditioning. This amplifier can operate with a Gain coefficient of up to 3.2, allowing the user to select the desired gain for the required application. This gain can be adjusted using an external resistor.

The MCP3427T-E/UN also features a Real-Time Sleep Mode which can be used to reduce the power consumption of the chip by turning off the converter during idle periods. This is done by sending a logic signal to the chip to enter this mode, which can then be triggered to leave this mode when needed.

Conclusion

The MCP3427T-E/UN is a versatile, low power, high performance, single-channel ADC that can be integrated into a wide range of data acquisition systems, consumer electronics, test and measurement and medical applications. It offers an adjustable gain amplifier, programmable filtering and a wide range of programmable modes, making it a suitable choice for applications requiring accuracy and flexibility.

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