Overview
The LMC7211AIM5X 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 features rail-to-rail input and push-pull output, and it is designed to operate at low supply voltages, including 2.7V, 5V, and 15V. Although the LMC7211 has been discontinued by Texas Instruments, it remains a significant component in existing designs due to its performance and low power consumption.
Key Specifications
| Parameter | Conditions | Typical Value | Limit |
|---|---|---|---|
| Supply Voltage (V+ - V-) | 2.7V to 15V | - | 16V |
| Input Offset Voltage (VOS) | V+ = 2.7V, 5V, 15V | 3 mV, 5 mV, 15 mV | 8 mV, 18 mV |
| Input Current (IB) | - | 0.04 pA | - |
| Common Mode Rejection Ratio (CMRR) | 2.7V ≤ V+ ≤ 15V | 75 dB, 82 dB | - |
| Power Supply Rejection Ratio (PSRR) | 2.7V ≤ V+ ≤ 15V | 80 dB | - |
| Output Voltage High (VOH) | Iload = 5 mA, V+ = 5V, 15V | 4.8 V, 14.8 V | 4.45 V, 14.45 V |
| Output Voltage Low (VOL) | Iload = 5 mA, V+ = 5V, 15V | 0.2 V, 0.2 V | 0.55 V, 0.55 V |
| Supply Current (IS) | VOUT = Low, V+ = 5V, 15V | 7 μA, 14 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, tPLH) | f = 10 kHz, Cl = 50 pF, Overdrive = 10 mV | 10 μs | - |
Key Features
- Tiny SOT23-5 Package: Saves space and is ideal for weight-critical designs.
- Rail-to-Rail Input: Input common-mode range extends beyond V- and V+.
- Push-Pull Output: Provides a clear and strong output signal.
- 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.
- Low Voltage Operation: Operates at supply voltages as low as 2.7V.
- Wide Input Common-Mode Voltage Range: Extends below ground and up to the positive supply rail.
Applications
- Battery Powered Products: Ideal for battery-powered devices due to low power consumption.
- Notebooks and PDAs: Suitable for portable electronic devices.
- PCMCIA Cards: Used in PCMCIA card designs where space is limited.
- Mobile Communications: Applied in mobile communication devices for signal comparison.
- Alarm and Security Circuits: Used in alarm and security systems for reliable signal detection.
- Direct Sensor Interface: Interfaces directly with sensors in various applications.
- Power Supply Monitoring: Used to monitor power supply voltages and compare them to reference voltages.
- Zero Crossing Detector: Can be used as a zero crossing detector with large input resistors.
Q & A
- What is the typical supply current of the LMC7211AIM5X at 5V?
The typical supply current is 7 μA at 5V.
- What is the input common-mode voltage range of the LMC7211AIM5X?
The input common-mode voltage range extends beyond V- and V+, typically from -0.3V to V+ - 0.3V.
- What is the response time of the LMC7211AIM5X?
The rise and fall times are 0.3 μs each, with a propagation delay of 10 μs.
- Can the LMC7211AIM5X be used with sensors directly?
Yes, it can directly interface with sensors without the need for amplifiers or bias circuits due to its high input impedance and wide input common-mode voltage range.
- What are the typical output voltage levels for the LMC7211AIM5X?
The output voltage high (VOH) is typically 4.8V at 5V supply and 14.8V at 15V supply, while the output voltage low (VOL) is typically 0.2V.
- Is the LMC7211AIM5X suitable for low voltage applications?
Yes, it operates at supply voltages as low as 2.7V without sacrificing performance.
- What is the common mode rejection ratio (CMRR) of the LMC7211AIM5X?
The CMRR is typically 75 dB at 2.7V and 82 dB at 15V.
- Can the LMC7211AIM5X be used as a zero crossing detector?
Yes, it can be used as a zero crossing detector with large input resistors.
- What is the maximum junction temperature for the LMC7211AIM5X?
The maximum junction temperature is 150°C.
- Is the LMC7211AIM5X RoHS compliant?
Yes, the LMC7211AIM5X is compliant with the current EU RoHS requirements.
