Overview
The LMC7211AIMX is a micropower CMOS comparator produced by Texas Instruments. It is available in a space-saving SOT23-5 package, making it ideal for designs where space and weight are critical. This comparator is designed to operate at low supply voltages, starting from 2.7V, and is suitable for a wide range of applications, including battery-powered products, notebooks, PDAs, and mobile communications.
Although the LMC7211 has been discontinued by Texas Instruments, its features and specifications remain relevant for existing designs and legacy systems.
Key Specifications
| Parameter | Conditions | Typical Value | Minimum Value | Maximum Value |
|---|---|---|---|---|
| Supply Voltage (V+ - V-) | 2.7V to 15V | - | 2.7V | 15V |
| Input Offset Voltage (VOS) | V+ = 2.7V, V- = 0V | 3 mV | 8 mV | 18 mV |
| Input Common-Mode Voltage Range (CMVR) | V+ = 2.7V, CMRR > 55 dB | -0.3V to V+ | -0.3V | V+ |
| Output Voltage High (VOH) | V+ = 5V, Iload = 5 mA | 4.8V | 4.45V | - |
| Output Voltage Low (VOL) | V+ = 5V, Iload = 5 mA | 0.2V | - | 0.55V |
| Supply Current (IS) | VOUT = Low, V+ = 5V | 7 μA | - | 18 μA |
| Rise Time (trise) | f = 10 kHz, Cl = 50 pF, Overdrive = 10 mV | 0.3 μs | - | - |
| Fall Time (tfall) | f = 10 kHz, Cl = 50 pF, Overdrive = 10 mV | 0.3 μs | - | - |
| Propagation Delay (tPHL) | f = 10 kHz, Cl = 50 pF, Overdrive = 10 mV | 10 μs | - | - |
Key Features
- Tiny SOT 23-5 Package: Saves space and is ideal for weight-critical designs.
- Rail-to-Rail Input: Input common-mode range extends beyond the power supply rails.
- Push-Pull Output: Capable of sourcing and sinking milliamp-level currents even at low supply voltages.
- Low Supply Current: Typical supply current of 7 μA at 5V.
- Fast Response Time: Rise and fall times of 0.3 μs with a propagation delay of 10 μs.
- High Input Impedance and Low Input Current: Suitable for sensing high impedance signals from sensors.
- Direct Sensor Interfacing: Can directly interface with sensors without the need for amplifiers or bias circuits.
- Zero Crossing Detector: Can be used as a zero crossing detector with large input resistors.
Applications
- Battery Powered Products: Ideal for devices that require low power consumption.
- Notebooks and PDAs: Suitable for portable electronic devices.
- Mobile Communications: Used in mobile devices and communication systems.
- Alarm and Security Circuits: Can be used in security systems and alarm circuits.
- Power Supply Monitoring: Useful for monitoring power supply voltages and comparing them to reference voltages.
- Battery Chargers: Can sense the voltage drop across a current sense resistor.
- Sensor Interfaces: Directly interfaces with sensors, eliminating the need for amplifiers or bias circuits.
Q & A
- What is the typical supply current of the LMC7211 at 5V?
The typical supply current is 7 μA at 5V.
- What is the input common-mode voltage range of the LMC7211?
The input common-mode voltage range extends beyond the power supply rails, from -0.3V to V+.
- What is the propagation delay of the LMC7211?
The propagation delay is 10 μs.
- Can the LMC7211 be used as a zero crossing detector?
Yes, it can be used as a zero crossing detector with large input resistors.
- What are the typical rise and fall times of the LMC7211?
The typical rise and fall times are both 0.3 μs.
- Is the LMC7211 suitable for high-speed applications?
No, it is not especially fast and does not require high-speed design practices.
- Can the LMC7211 drive LEDs directly?
Yes, with a 5V power supply, it can drive small, high-efficiency LEDs.
- What is the package type of the LMC7211AIMX?
The package type is SOT23-5.
- Is the LMC7211AIMX still in production?
No, the LMC7211 has been discontinued by Texas Instruments.
- What are some common applications of the LMC7211?
Common applications include battery-powered products, notebooks, PDAs, mobile communications, alarm and security circuits, and sensor interfaces.
