AD790JN

Series:	--
Packaging:	Tube
Part Status:	Obsolete
Type:	with Latch
Number of Elements:	1
Output Type:	CMOS, TTL
Voltage - Supply, Single/Dual (±):	4.5 V ~ 7 V, ±2.25 V ~ 16.5 V
Voltage - Input Offset (Max):	1.5mV @ 5V
Current - Input Bias (Max):	5µA @ 5V
Current - Output (Typ):	--
Current - Quiescent (Max):	10mA
CMRR, PSRR (Typ):	95dB CMRR, 90dB PSRR
Propagation Delay (Max):	50ns
Hysteresis:	500µV
Operating Temperature:	0°C ~ 70°C
Package / Case:	8-DIP (0.300", 7.62mm)
Mounting Type:	Through Hole
Supplier Device Package:	8-PDIP
Base Part Number:	AD790

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Linear - Comparators

Comparing voltage levels is an essential requirement for a wide range of applications. The AD790JN is a monolithic, high speed, low power, CMOS linear comparator. It offers a wide range of features such as parity generation and detection, supply status indication and greater than threshold indication. This device is designed for applications that require low input current, low supply current and high output drive capability.

Applications

The AD790JN has a wide range of applications, many of which are in industrial, consumer and commercial markets. It\'s widely used for various types of consumer and industrial electronic systems. These include light sensors, temperature and pressure controllers, industrial relay controls, digital-to-analog converters, supply monitoring, battery monitoring, and voltage regulation.

Features

The AD790JN has a maximum operating voltage of 25.6V. It has a fast response time and a wide input common mode voltage range. It also has a low input current of typically 0.5pA and low supply current of typically 55µA. Furthermore, it has a high output drive capability with a high current sink of typically 30mA and high current source of typically 30mA.The device is also designed to be compatible with all popular logic families such as, CMOS, RTL, and ECL. It offers thermal protection, output voltage standardization, comparator symmetry and spike suppression.

Working Principle

The AD790JN is a linear comparator that is based on a differential amplifier. It compares the applied voltage levels at its two input pins, and outputs a corresponding voltage level at its output pin.The differential amplifier is essentially composed of two transistors, one p-channel and one n-channel. These transistors are connected in series in such a way that their bases are at the same potential. When voltage at the non-inverting input terminal is more positive than at the inverting input terminal, current will flow from the inverting input to the non-inverting input. This increases the voltage at the output terminal.The differential amplifier is connected with an open-drain output and an external pull-up resistor. This ensures that the output voltage is low for one input being higher than the other and high for the opposite situation.The low input bias current and the high output drive current are both due to the inherent biasing of the differential amplifier. The low voltage is maintained by the use of active clamp circuits to maintain a very low voltage drop across the output pull-up transistor. The active clamp circuits also provide good noise immunity by acting as a source of noise dampening. The device also has an active temperature compensation which ensures that its offset voltage remains constant over temperature.

Conclusion

The AD790JN is an ideal solution for applications requiring a low power, high speed, low voltage, linear comparator. It is used in a wide range of industrial and consumer applications. Its low input current and low supply current ensure that it can be used in battery operated applications. Its high output drive capability ensures that it can deliver a wide range of current. Its active temperature compensation ensures that its offset voltage remains constant across temperature. These features combined with its wide range of supported logic family make it an ideal choice for many applications.

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