AD5428YRU

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Data Acquisition - Digital to Analog Converters (DAC) can be employed to create a variety of signals in the analog domain. One such converter is the AD5428YRU. In this article, we will discuss the application field and working principles of the AD5428YRU.

The AD5428YRU is an 8-channnel, 12/14-bit, unipolar, buffered voltage-output DAC with a built-in voltage reference. It is ideal for industrial motor and motion control applications due to its low voltage noise, good linearity and fast settling time. It also offers easy programming and requires minimal external components.

The output voltage range of the AD5428 is adjustable between 0V and VREF by dividing the operating voltage externally. When powered, the current reference is set to 0.5V and the external voltage reference is set to a voltage not greater than 2.7V. The output voltage can be varied by adjusting the voltage reference and the binary-weighted DAC output current. However, the output range cannot be changed.

The working principle of the AD5428YRU is based on the Voltage Follower technique. When the DAC is programmed, an internal current source is activated and the DAC output current is the sum of the signal current and the bias current. The resulting output voltage, which is held constant, is proportional to the signal current. A high-gain operational amplifier is then used to buffer the signal current and create a stable output voltage. The reference current is generated by a precision current source, and an external reference voltage is required to ensure accurate conversions.

The DAC can be interfaced with a microcontroller via one of the 10-bit parallel digital code inputs. The DAC supports various commands such as write, read, and reset. This DAC can be operated in two modes, single-mode and double-mode. In single-mode, each DAC can be independently programmed, while in double-mode, all DACs are linked together, providing simultaneously updated outputs.

The AD5428YRU can be used in various motor and motion control applications such as motor speed control, motor torque control, motor positioning, and motor acceleration. It is also suitable for AC inverters and motor positioning and driving. The low voltage noise, good linearity and fast settling time makes it ideal for these applications. The DAC can also be used in automotive and servo motor control, current and voltage regulation as well as medical device applications.

In conclusion, the AD5428YRU is an 8-channel, 12/14-bit, unipolar, buffered voltage-output DAC with a built-in voltage reference. It can be used in various motor and motion control applications due to its excellent specifications. The working principle is based on the Voltage Follower technique, and can be operated in either single-mode or double-mode. Thus, it is suitable for many different applications requiring precise digital-to-analog conversion.

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