AD581SH

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AD581SH is a monolithic IC designed for use as a precise voltage reference or as the active element in a precision voltage regulator circuit. It is a PMIC (Power Management Integrated Circuit) Voltage Reference and is available in several different temperature coefficient grades. In terms of application fields, this IC can be commonly used in a wide range of electronic applications, from precision industrial and communications equipment to environmental control systems.

The AD581SH is designed with a very low temperature coefficient and is capable of producing a 10.0V ±0.5V reference with a temperature coefficient of 100ppm/°C maximum over the -40°C to +85°C temperature range. The AD581SH includes laser trimmed on-chip resistors to ensure a low operating temperature coefficient, making it well-suited for precision voltage regulation applications. In addition, the AD581SH has a very low resistance drop feature, which means that there is no need to provide external resistance for current limiting purposes in most applications.

The maximum input voltage that the AD581SH can accept is 12V. This allows the user to design circuits that accept higher voltage than what the device can output and this can be especially useful for situations where there is a need for output voltage that exceeds the normal operating range of an IC.

The AD581SH can operate as either a two-terminal or a three-terminal reference. When operating as a two-terminal device, the VREF pin is connected to the output voltage. In this mode, the output voltage is regulated from a VREF pin, which is adjustable with an external resistor. As a three-terminal device, the AD581SH uses an external reference, such as a bandgap reference, to regulate the output voltage, while the VREF pin is used to adjust the output voltage.

In terms of working principle, the AD581SH circuit includes an integrated circuit (IC) composed of four p-channel field-effect transistors (FETs) and a control amplifier. The four FETs can be connected in either a "diode-connected" bridge arrangement or a parallel arrangement with two FETs being series-connected. In a diode-connected bridge arrangement, one FET functions as the current source and the other FET functions as the current sink. The two series-connected FETs form the actual voltage reference. In operation, for example, if the voltage at the output has to be increased, the control amplifier increases the current to the sink FET, thereby increasing the output voltage. The output voltage is kept constant as long as the current from the source FET remains the same.

Additionally, the AD581SH IC also has an integrated temperature monitoring function. This is useful for monitoring the operating temperature of the device, especially in temperature-sensitive applications. This feature helps ensure that the output voltage is maintained within specified limits even when the device is subjected to extreme temperatures.

In conclusion, the AD581SH is a PMIC Voltage Reference that is suitable for various precision voltage regulation applications. It is designed with low temperature coefficient, resistance drop and provides temperature monitoring. The AD581SH can effectively keep the output voltage steady within specified limits despite extreme temperature changes, making it a reliable solution in precision industrial and communications equipment as well as environmental control systems.

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