Overview
The OPA2111BM is a high precision, monolithic dielectrically isolated FET (Difet) operational amplifier produced by Texas Instruments. It is renowned for its outstanding performance characteristics, making it suitable for the most critical instrumentation applications. The OPA2111BM features very low bias current, low offset voltage, and low drift, achieved through dielectric isolation and laser trimming of thin-film resistors. Its patented cascode design ensures high precision input specifications and reduced susceptibility to flicker noise.
Key Specifications
| Parameter | Condition | Min | Max | Units | |
|---|---|---|---|---|---|
| Input Noise Voltage (fO = 10Hz) | 100% Tested | 40 | 80 | 30 | nV/√Hz |
| Input Noise Voltage (fO = 100Hz) | 100% Tested | 15 | 40 | 11 | nV/√Hz |
| Input Noise Voltage (fO = 1kHz) | 100% Tested | 8 | 15 | 7 | nV/√Hz |
| Input Offset Voltage | VCM = 0VDC | ±0.22 | ±1.2 | ±0.08 | mV |
| Average Drift | ±2 | ±6 | ±0.5 | µV/°C | |
| Common-Mode Rejection Ratio (CMRR) | 82 | 110 | dB | ||
| Gain-Bandwidth Product (GBW) | 2 | MHz | |||
| Input Bias Current | 4 | pA | |||
| Quiescent Current per Channel | 2.5 | 3.5 | mA | ||
| Operating Temperature Range | -40 | 85 | °C | ||
| Output Current | 40 | mA | |||
| Slew Rate | 2 | V/µs | |||
| Total Supply Voltage | 10 | 36 | V |
Key Features
- High Precision: The OPA2111BM boasts very low bias current, low offset voltage, and low drift, making it ideal for critical instrumentation applications.
- Dielectric Isolation: This feature ensures very low bias current and protects the inputs against destructive currents without the need for external current-limiting resistors.
- Low Noise: The patented cascode design and laser trimming of thin-film resistors result in extremely low noise levels.
- High CMRR and PSRR: High common-mode rejection ratio (CMRR) and power supply rejection ratio (PSRR) enhance the amplifier's performance in various applications.
- Standard Dual Op Amp Pin Configuration: Allows for easy upgrading of existing designs to higher performance levels.
- Robust Input Protection: No special protection is needed due to its dielectric isolation, although differential and common-mode voltage limits should be observed.
Applications
- Critical Instrumentation: Suitable for applications requiring high precision, such as medical devices, scientific instruments, and industrial control systems.
- Photodiode Amplifiers: Used in configurations to monitor photodetector currents, bridging the gap between physical events and electronics.
- Single-Supply Operation: Can be operated from single supply voltages, which is useful in applications where negative supply voltages are not available.
- Active Feedback Circuits: Used in integrating converters, composite amplifiers, and other active feedback circuits due to its stable and precise performance.
Q & A
- What is the OPA2111BM?
The OPA2111BM is a high precision, monolithic dielectrically isolated FET (Difet) operational amplifier produced by Texas Instruments.
- What are the key features of the OPA2111BM?
Key features include very low bias current, low offset voltage, low drift, high CMRR, and low noise levels.
- What is the typical gain-bandwidth product (GBW) of the OPA2111BM?
The typical GBW is 2 MHz.
- What is the input bias current of the OPA2111BM?
The input bias current is typically 4 pA.
- What is the operating temperature range of the OPA2111BM?
The operating temperature range is -40°C to 85°C.
- Does the OPA2111BM require external current-limiting resistors for input protection?
No, due to its dielectric isolation, no special protection is needed.
- Can the OPA2111BM be used in single-supply voltage applications?
- What are some common applications of the OPA2111BM?
- Is the OPA2111BM RoHS compliant?
- What is the typical slew rate of the OPA2111BM?
The typical slew rate is 2 V/µs.
