MAX545ACPD+

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Digital to Analog Converters (DAC) are devices that convert digital signals into analog signals for analog electronic devices. As one of the most important categories of data acquisition, DACs are broadly used in various applications such as industrial, military, broadcast and consumer electronics. The MAX545ACPD+ is a dual 8-bit multiplying DAC. In this article, the application fields, the working principle will be elaborated.

Application fields of the MAX545ACPD+

The MAX545ACPD+ is a 4-channel, 8-bit, voltage output, multiplying DAC. It enables users to directly multiply a converted signal with a reference signal, controlling the size and impedance of an output signal. It is especially suited for applications with limited noise margin or limited power supply capability, such as audio-level signal conditioning, adjusting the gain and offset of audio signals, and tracking the level of signals in variable loads or environments. In particular, the MAX545ACPD+ is typically used in digital hearing aids which require a high signal-to-noise ratio. Another common use of the MAX545ACPD+ is for controlling variable-gain amplifiers, where the output of the DAC is connected to the control input of the amplifier.

Working Principle of the MAX545ACPD+

The MAX545ACPD+ contains two separate 8-bit DAC elements, each with four binary-weighted, laser-trimmed resistors. The MAX545ACPD+ operates from a single +10V to +15V, bipolar DAC power supply and the output can swing between the DAC supply voltage and GND. The reference input of the MAX545ACPD+ is a single 5V to + 10V voltage.

The MAX545ACPD+ provides user-selectable gain-setting resistors, with two resistor values and three ratios. The 10x resistor can be switched between 10 and 20 KΩ, while the 100x resistor can be switched between 100 and 200KΩ. This allows the total gain range to be on the order of single to 1020.

The reference voltage is applied to the multiplier inputs of both DACs, allowing the user to integrate variable voltage sources into their circuit. As the reference voltage is varied, the user can adjust the gain and offset characteristics of the DAC. In addition, the MAX545ACPD+ provides a high-gain output amplifier that allows output to swing between the DAC supply voltage and GND.

The MAX545ACPD+ also contains an on-chip voltage reference that provides high precision,very low temperature drift and low noise. This makes the MAX545ACPD+ ideal for applications requiring low noise and low signal distortion such as audio signal processing.

Conclusion

The MAX545ACPD+ is a unique dual 8-bit multiplying DAC with outstanding features and performance. Applications that involve signal conditioning, audio signal processing and controlling variable gain amplifiers are suited for the MAX545ACPD+. It can also be used in hearing aids due to its low noise and low signal distortion capabilities. The on-chip voltage reference provides great performance and stability, making it highly desirable for a wide range of applications.

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