AD7801BRUZ-REEL

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Data Acquisition - Digital to Analog Converters (DAC) refer to devices capable of interpreting digital signals and converting them into an analog format for use in research and development applications. The AD7801BRUZ-REEL is one such device deemed fit for a variety of such tasks. This article analyses the application field and working principle of this device in greater detail.

Overview

The AD7801BRUZ-REEL is a dual, 12-bit Digital-to-Analog Converter (DAC). It has an on-chip reference and output amplifier and is designed to offer improved power consumption over other DACs. The device has a +3 V to +5.5 V single-supply voltage range, and operating temperature range from -40°C to +85°C.

Application Field

The AD7801BRUZ-REEL is an ideal choice for making system adjustments in noncritical analog applications. It is suitable for applications in the industrial and consumer markets, including adjustable power supplies, data acquisition systems and process control. Additionally, the device is ideal for interfacing with potentiometers, precision analog circuits and digital audio systems.

Working Principle

The AD7801BRUZ-REEL is capable of converting 12-bit digital values into a proportional analog voltage or current output. It supports a wide range of voltage reference and operates according to an external clock. The device contains an on-chip amplifier to enable the DAC to work with low-voltage reference circuits. It also comprises a 12-bit resistor-string DAC, which offers excellent linearity and wide dynamic range.

Once the digital code is stored in the DAC, each bit increments the current in the resistor string counter. After completion of a cycle, the net gain of the resistor current is converted into an analog voltage. As soon as the digital logic is updated, a new cycle is initiated, thereby transforming the digital code into the corresponding analog output.

Power Control

The AD7801BRUZ-REEL is equipped with a Power-down Mode, which significantly reduces the device power consumption. This mode halts the DAC logic operation and retains the present DAC voltage, thereby significantly reducing power consumption. In addition, the Power-down Mode can also be activated by a digital write. Another integrated feature is Sleep Mode, which enables the DAC to reduce power while maintaining the present output.

Error Correction

The AD7801BRUZ-REEL is designed to offer superior linearity and a wider dynamic range in comparison to the other DACs. This device has a differential nonlinearity of 1 LSB and provides high accuracy output over the full range of temperatures. The outputs are also precision trimmed to reduce drift over the long term.

Conclusion

The AD7801BRUZ-REEL is a versatile Digital-to-Analog Converter (DAC), which interpret digital information and turn them into an analog output. It has an on-chip reference, power-down and sleep mode, thereby enabling efficient power control. This DAC has a wide range of applications in areas such as data acquisition systems and process control, and offers excellent linearity, wider dynamic range and higher accuracy.

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