LM392 Low Power Dual Comparator

Key Features of LM392:

1. Dual Comparator: The LM392 has two independent comparators that can be used in parallel for multiple functions in a circuit.
2. Low Power Consumption: It’s designed to operate with minimal power, making it ideal for battery-operated devices or other low-power applications.
3. Wide Input Voltage Range: It has a wide input voltage range, which makes it flexible for different types of voltage inputs.
4. Output Transistor: The output stage includes an open-collector transistor that allows for easier interfacing with different logic circuits.
5. Low Supply Current: The LM392 is designed to consume low supply current, which helps to extend battery life in portable applications.
6. Offset Voltage: The LM392 has a low input offset voltage, which enhances the accuracy of voltage comparisons.
7. Wide Operating Voltage Range: It operates from a single supply voltage ranging from 3V to 30V, or a dual supply voltage from ±1.5V to ±15V.

Applications:

• Voltage Level Detection
• Pulse Width Modulation (PWM) Signal Generation
• Zero Crossing Detectors
• Signal Conditioning
• Comparator Circuits in Microcontroller Systems
• Over-voltage/Under-voltage Detection

Detailed Specifications:

Feature	Specification
Comparator Type	Dual Comparator
Supply Voltage (Vcc)	3V to 30V (Single supply), ±1.5V to ±15V (Dual supply)
Input Voltage Range	(V-), (V+)
Input Bias Current	100nA (max)
Output Voltage Swing	0V to Vcc-1.5V (open collector output)
Input Offset Voltage	5mV (max)
Output Saturation Voltage	400mV (max)
Quiescent Current	300µA (typ)
Power Supply Current	600µA (typ)
Package Type	8-pin DIP, SOIC
Temperature Range	-40°C to +125°C
Response Time	1µs (typ)
Power Consumption	Low (typical 300µA)

Pin Configuration (8-pin DIP and SOIC):

1. Pin 1 (Comparator 1 Output): Open-collector output for comparator 1.
2. Pin 2 (Comparator 1 Inverting Input): Inverting input of comparator 1.
3. Pin 3 (Comparator 1 Non-Inverting Input): Non-inverting input of comparator 1.
4. Pin 4 (Ground): Ground pin for the IC.
5. Pin 5 (Comparator 2 Non-Inverting Input): Non-inverting input of comparator 2.
6. Pin 6 (Comparator 2 Inverting Input): Inverting input of comparator 2.
7. Pin 7 (Comparator 2 Output): Open-collector output for comparator 2.
8. Pin 8 (Vcc): Power supply pin (positive voltage).

Code Example:

Below is a simple code example to use the LM392 in a microcontroller-based project for voltage threshold detection (e.g., Arduino).

CPP :

In this example, the LM392 is used to compare an input voltage with a reference voltage. The output of the LM392 is connected to an input pin on the Arduino, and the program checks if the input voltage is higher or lower than the reference voltage.

Applications in Circuit Design:

• Zero-Crossing Detectors: The LM392 can be used to detect when a sinusoidal waveform crosses zero voltage, which is often useful in phase-locked loops (PLLs) or AC signal processing.
• Temperature Sensing: It can be used in circuits for temperature sensing where the voltage from a thermistor or temperature sensor is compared against a set threshold.
• Voltage Regulation: Can be used to monitor and compare input and output voltages in power regulation circuits.

Advantages:

• Low Power Consumption: Ideal for battery-powered designs.
• Flexibility: Wide voltage range, capable of working with both single and dual supplies.
• Precision: Low offset voltage for accurate comparisons.

Disadvantages:

• Open-Collector Output: Requires external pull-up resistors for the output signal to work properly.
• Slower Response: While sufficient for many applications, the LM392 may not be suitable for very high-speed applications due to its response time.

Ordering Information:

The LM392 is typically available in the following packages:

• LM392N: 8-Pin DIP
• LM392D: 8-Pin SOIC