Noise - 0.1Hz to 10Hz:	4µVp-p
Base Part Number:	AD587
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 70°C (TA)
Current - Supply:	4mA
Voltage - Input:	13.5 V ~ 36 V
Noise - 10Hz to 10kHz:	--
Series:	--
Temperature Coefficient:	10ppm/°C
Tolerance:	±0.05%
Current - Output:	10mA
Voltage - Output (Min/Fixed):	10V
Output Type:	Fixed
Reference Type:	Series
Part Status:	Obsolete
Packaging:	Tube

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PMIC - Voltage Reference

Power management integrated circuits (PMICs) are essential components of virtually all current electronic applications, from energy-critical wearables to the most powerful supercomputers. PMICs take input power from a wide range of sources-including batteriessolar power, and AC wall outlets-and safely regulate, manage, and convert it for a wide array of downstream applications.One of the most important types of PMICs is the voltage reference (also referred to as a voltage regulator), which stabilizes and maintains the output voltage of power supplies. Voltage references help eliminate the losses caused by signal noise and the drifting of different electrical components in the circuit, thus guaranteeing a reliable and accurate signal. Furthermore, some voltage references are also capable of providing additional features such as current limiting, short circuit protection, and overvoltage protection.In this article, we\'ll take a look at the AD587KR voltage reference, developed by Analog Devices as a cost-effective, reliable PMIC solution. We\'ll explore its application fields and describe its working principle in detail, so that you can understand how it works and how it can benefit your application.

Application Fields

The AD587KR voltage reference is a robust and versatile voltage reference that can be used in a wide range of applications. Thanks to its small package size, low power consumption, and immunity to shock and vibration, it is increasingly used in automotive, industrial, and consumer electronics applications.In automotive applications, the AD587KR is used in instrumentation converters, such as auto speedometers and tachometers, and other control circuits. In consumer electronics, it is increasingly being used in LCD TV sets, digital audio equipment, and portable consumer devices. The AD587KR is also particularly well suited for industrial applications due to its compact size and reliable performance. It is used in programmable logic controllers, temperature controllers, set point controllers, and various other industrial control applications. It is also used in a range of security systems, such as access control, intruder detection, door entry, and surveillance systems.

Working Principle

The AD587KR voltage reference is an integrated circuit that operates by exploiting the breakdown effect of diodes. It produces a reference voltage from an input voltage in a wide range, from 3.3V to 24V, with a very low temperature coefficient of up to 0.07mV/°C.The AD587KR is composed of two voltage reference cores, operating in parallel. The first core consists of two complementary bipolar transistors operating in series, connected to the input voltage. The second core is a band-gap reference, which provides a stable and accurate reference voltage.The two cores are connected in parallel to the selection switch, and the output of the selection switch is connected to the output buffer. The output buffer serves as a buffer amplifier, providing the regulated and stable output voltage.The AD587KR is further equipped with various configuration features, such as an output enable, which allows the user to control when the output voltage is activated or deactivated. There are also other features such as overvoltage protection, current limiting, and short circuit protection.

Conclusion

The AD587KR voltage reference is a cost-effective and reliable PMIC solution from Analog Devices, offering a wide range of features and benefits for a wide range of applications. Thanks to its small package size, low power consumption, and immunity to shock and vibration, it is increasingly being used in automotive, industrial, and consumer electronics applications. With its two voltage reference cores operating in parallel and a range of configuration features, it provides stable and accurate reference voltage outputs with very low temperature coefficient.

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