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Data Acquisition - Digital to Analog Converters

AD5684RBRUZ-RL7 application field and working principle

Digital-to-analog converters (DACs) are key analog circuit components integrated in virtually any electronics system to provide a linear, continuous signal from a variety of digital inputs. The AD5684RBRUZ-RL7, offered by Analog Devices, Inc (ADI) is a 16-bit, quad DAC with current output options. With a power supply spanning 2.7 V to 5.5 V, this device provides the highest signal-to-noise ratio (SNR) and differential nonlinearity (DNL) available in the industry.

AD5684RBRUZ-RL7 DAC provides a programmable output range. The user can adjust the output voltage to provide a range of outputs. Each of the four outputs has an adjustable output voltage range of -10 V to +10 V, or 0 V to 10 V through the reference pin. The user can also program the output via I2C interface so that each of the four outputs can achieve unique levels. The higher 16-bits of resolution provide a much better dynamic range than the conventional 8-bit DAC.

The device can produce four channels of bitprogrammable analog current output.The Internal precision buffer amplifier enables the device to drive load up to an output current of ±10 mA at up to ±5 V. This makes the AD5684RBRUZ-RL7 suitable for a variety of applications, from medical instrumentation to automotive instrumentation. As it is a four-channel DAC,it can be particularly useful in applications where synchronous analog signals are required, such as in temperature monitors or multi-phase motor controllers.

Working Principle

The AD5684RBRUZ-RL7 works by taking in 2.7 V to 5.5 V digital input and converting it into a voltage or current output. This is done by taking advantage of the linear relationship between digital states and an analog output level. The 16-bit resolution ensures that the digital signal is converted into a smooth, continuous output.

The device employs an internal band-gap reference to generate its reference voltage. The reference voltage is then used to generate the output voltage or current. The voltage or current then goes through the DAC\'s internal amplifier, which is adjustable and can provide output levels from ±10 mA up to ±5 V.

The AD5684RBRUZ-RL7 has integrated temperature compensation, which avoids the gain and offset drift that can occur with temperature variation. The device also features Power-on Reset circuitry, which guarantees the proper outputs on power-up and eliminates any glitches on the outputs.

Conclusion

The AD5684RBRUZ-RL7 is a highly integrated, 16-bit, quad DAC with current output options. With a power supply spanning 2.7 V to 5.5 V and an adjustable voltage or current output, the device is suitable for a variety of applications, from medical instrumentation to automotive instrumentation. The internal amplifier, temperature compensation and Power-on Reset features enable the device to provide a performance that is unmatched in the industry.

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