LMC6482AIM: Dual Rail-to-Rail CMOS Op-Amp for Precision & Low-Power Applications
LMC6482AIM: Texas Instruments' Precision Dual CMOS Op-Amp with Rail-to-Rail Output
Introduction to the LMC6482AIM
The LMC6482AIM represents Texas Instruments' commitment to high-precision analog solutions. This dual-channel CMOS operational amplifier combines ultra-low power consumption with exceptional accuracy, making it a standout choice for engineers designing sensitive measurement systems, portable medical devices, and industrial sensor interfaces.
Detailed Technical Specifications
Unmatched Precision Characteristics
- Input Bias Current: 0.02 pA (typical) among the lowest in class
- Input Offset Voltage: 110 V (max) at 25 C
- CMRR: 90 dB (typical) ensures excellent noise rejection
Power Efficiency & Flexibility
- Supply Current: Just 1.3 mA per amplifier (typical)
- Wide Voltage Range: 3V to 15.5V single supply operation
- Power-Down Feature: Available in LMC6482AIMX variant
Advanced Performance Features
Rail-to-Rail Output Stage
The amplifier's output swings within 50 mV of either rail (at 10 k load), maximizing dynamic range in low-voltage systems. This makes it particularly valuable for:
- Battery-powered data loggers
- Portable test equipment
- Energy harvesting applications
Enhanced Speed-Accuracy Balance
- Slew Rate: 1.3 V/ s (typical)
- Gain Bandwidth Product: 1.5 MHz
- Settling Time: 5 s to 0.1% (10V step)
Package Options & Environmental Ratings
| Package | Dimensions | Temperature Range |
|---|---|---|
| 8-SOIC | 4.9mm x 3.9mm | -40 C to +85 C |
| 8-MSOP | 3mm x 3mm | -40 C to +125 C |
5 Key Application Circuits
- Photodiode Amplifier: Leverage the ultra-low input current for precise light measurement
- pH Sensor Interface: Maintain accuracy in high-impedance electrochemical systems
- Portable ECG Front-End: Combine low power with rail-to-rail performance
- Strain Gauge Conditioner: Utilize both amplifiers for bridge configuration
- Energy Harvesting System: Operate effectively at 3V supply
Design Considerations
PCB Layout Best Practices
When implementing the LMC6482AIM:
- Use guard rings around high-impedance inputs
- Implement 0.1 F power supply decoupling within 5mm
- Keep sensitive traces shorter than 10mm
Alternative Component Analysis
For new designs, consider these alternatives:
- LMC6484: Quad version with similar specs
- OPA391: Newer nano-power (0.5 A) alternative
- TLV9042: 1MHz GBW with 0.5pA input current
Frequently Asked Questions
- Q: Can the LMC6482AIM handle capacitive loads?
- A: Yes, it remains stable with loads up to 100pF without compensation
- Q: Is this amplifier radiation-hardened?
- A: No, for space applications consider the RHFL4913A
- Q: What's the typical noise performance?
- A: 35nV/ Hz at 1kHz (voltage noise)
Conclusion
The LMC6482AIM continues to be a reliable choice for precision analog designs despite its 'Not for New Designs' status. Its unique combination of femtoampere input current, rail-to-rail output, and wide voltage range makes it particularly valuable for legacy system maintenance and low-volume specialty applications. Engineers appreciate its consistent performance across temperature variations and its ability to interface directly with high-impedance sensors without additional buffering.
For current availability or migration assistance to newer alternatives, contact our technical support team with your specific requirements. We maintain extensive cross-reference databases to help transition your designs while maintaining or improving performance parameters.