MAX521BEWG+T

Reference Type:	External
Base Part Number:	MAX521
Supplier Device Package:	24-SOIC
Package / Case:	24-SOIC (0.295", 7.50mm Width)
Operating Temperature:	-40°C ~ 85°C
Architecture:	R-2R
INL/DNL (LSB):	±2 (Max), ±1 (Max)
Voltage - Supply, Digital:	5V
Voltage - Supply, Analog:	5V
Series:	--
Data Interface:	I²C
Differential Output:	No
Output Type:	Voltage - Buffered
Settling Time:	6µs (Typ)
Number of D/A Converters:	8
Number of Bits:	8
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The MAX521BEWG+T is a digital-to-analog converter (DAC) device which is primarily used in data acquisition applications. It offers a high-resolution, monolithic solution for those who need to convert digital words into analog voltages. This chip has a wide range of features that make it suitable for many different applications, and its low power consumption makes it ideal for battery-powered applications. In this article, we will discuss the application area and working principle of the MAX521BEWG+T DAC.

Application Field

The MAX521BEWG+T is especially popular in data acquisition applications. This chip provides 3.2V rail-to-rail output, with a setting resolution of 10-bits. It is the industry-leading low-power, voltage-output DAC that can replace expensive high-resolution, motor-driven analog-to-digital converters (ADCs) in certain applications such as: • DAC output buffering• Patient monitoring• Instrumentation• Liquid/viscous flow monitoring• Solar/wind power conversion• Data acquisition• Load current/voltage sensing• Temperature monitoringThe wide voltage range of the MAX521BEWG+T makes it suitable for a variety of applications. It can operate between a supply voltage of 2.7 to 5.5V and offers rail-to-rail output. The low power consumption makes it ideal for battery-powered applications. Compared to other voltage output DACs, it offers a high setting resolution of 10-bits, which is suitable for applications that require small but highly accurate steps such as medical and agricultural equipment, robotics guidance systems, and remote sensing devices.

Working principle

The MAX521BEWG+T DAC is based on a resistor-string architecture, in which the resistance of each resistor varies in a linear manner. The resistors are connected to a voltage source in the form of an internal bandgap reference voltage, and the output of the converter is connected to the end of the resistor string. The output voltage is then determined by the number of resistors used in the string.The resistance of each resistor depends on the value of the digital input data. The device divides the resistance range into 10-bit segments, with each bit representing one segment. For each voltage output, the resistance of each resistor is adjusted based on the value of the digital input. This ensures that the output voltage is an exact representation of the digital data.The MAX521BEWG+T DAC also features an integrated current-feedback error amplifier, which helps to limit errors caused by power supply variations. This amplifier is also used to drive the output current and improve the linearity of the DAC. In addition, the device features a built-in temperature stability feature which prevents errors due to temperature changes.

Conclusion

The MAX521BEWG+T is a high-resolution, low-power DAC that is extensively used in data acquisition applications. It can be used to replace expensive high-resolution motor-driven ADCs in certain applications such as patient monitoring, instrumentation, and liquid/viscous flow monitoring. This device provides 3.2V rail-to-rail output and offers a setting resolution of 10-bits. It features an integrated error amplifier to reduce errors caused by power supply variations and incorporates a temperature stability feature to prevent errors due to temperature fluctuations.

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