LM2903N
Part Number: LM2903N
Manufacturer: Texas Instruments (TI)
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The LM2903N is a dual differential comparator designed to operate from a single power supply over a wide range of voltages. It is part of the LM2903 series of comparators, which are known for their low power consumption and ability to operate in harsh environments. The device is commonly used in applications such as voltage monitoring, level detection, and analog-to-digital conversion.
Manufacturer:
The LM2903N is manufactured by several companies, including:
- Texas Instruments (TI)
- ON Semiconductor
- STMicroelectronics
- Rochester Electronics
Specifications:
| Parameter | Value |
|---|---|
| Supply Voltage (Vcc) | 2V to 36V |
| Input Offset Voltage | ±1 mV (typical) |
| Input Bias Current | 25 nA (typical) |
| Response Time | 1.3 µs (typical) |
| Operating Temperature | -40°C to +125°C |
| Package Type | PDIP-8, SOIC-8 |
| Number of Channels | 2 |
| Output Type | Open Collector |
| Quiescent Current | 0.4 mA (typical) per comparator |
| Input Common-Mode Range | 0V to Vcc – 1.5V |
| Output Sink Current | 16 mA (typical) |
| ESD Protection | Yes |
Features:
- Wide Supply Voltage Range: Operates from 2V to 36V, making it suitable for both single and dual supply applications.
- Low Power Consumption: Quiescent current is typically 0.4 mA per comparator.
- Low Input Bias Current: Typically 25 nA, which minimizes the impact on the input signal.
- Open Collector Output: Allows for flexible output configurations, including wired-OR connections.
- High ESD Protection: Provides robustness in harsh environments.
- Wide Temperature Range: Operates reliably from -40°C to +125°C.
- Dual Comparators: Contains two independent comparators in a single package, saving board space.
Applications:
- Voltage Monitoring: Used in power supply monitoring circuits to detect under-voltage or over-voltage conditions.
- Level Detection: Commonly used in level detection circuits for analog signals.
- Analog-to-Digital Conversion: Used in ADC circuits to compare analog signals with reference voltages.
- Oscillators: Can be used in oscillator circuits for generating square waves.
- Motor Control: Used in motor control circuits for speed and position sensing.
- Battery Management: Employed in battery management systems for charge and discharge monitoring.
- Signal Conditioning: Used in signal conditioning circuits to compare and process analog signals.
Package Types:
- PDIP-8: Plastic Dual In-Line Package with 8 pins.
- SOIC-8: Small Outline Integrated Circuit with 8 pins.
Typical Application Circuit:
The LM2903N is often used in a simple comparator circuit where the non-inverting input is connected to a reference voltage, and the inverting input is connected to the signal to be compared. The output is typically pulled up to a supply voltage through a resistor, and it switches between ground and the supply voltage depending on the input signal.
Conclusion:
The LM2903N is a versatile and reliable dual comparator IC that is widely used in various electronic applications due to its wide operating voltage range, low power consumption, and robust performance. Its ability to operate in harsh environments and its flexibility in output configuration make it a popular choice among designers.