Overview
The OPA2111SM is a high precision monolithic dielectrically isolated FET (Difet) operational amplifier produced by Burr-Brown Corporation. It is designed to offer outstanding performance characteristics, making it suitable for the most critical instrumentation applications. The OPA2111SM features very low noise, bias current, voltage offset, and drift, along with high open-loop gain, common-mode rejection, and power supply rejection. These attributes are superior to those of BIFET amplifiers. The use of dielectric isolation with on-chip guarding and laser trimming of thin-film resistors contributes to its high precision and low noise performance.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Input Offset Voltage | VCM = 0VDC | ±0.22 | ±0.08 | ±0.75 | mV |
| Average Drift | ±2 | ±0.5 | ±2.8 | µV/°C | |
| Supply Voltage | ±15VDC | ±18VDC | V | ||
| Operating Temperature Range | –55°C | +125°C | °C | ||
| Input Noise Voltage (fO = 1kHz) | 8 | 12 | 15 | nV/√Hz | |
| Common-Mode Rejection Ratio | 100dB | 110dB | 120dB | dB | |
| Power Supply Rejection Ratio | 80dB | 100dB | 120dB | dB |
Key Features
- High Precision: The OPA2111SM boasts very low input offset voltage and drift, making it ideal for precise instrumentation applications.
- Low Noise: Achieves extremely low noise levels, particularly in the 1 kHz to 10 kHz frequency range, due to patented circuit design techniques and cascode design.
- Low Bias Current: Very low bias current is obtained through dielectric isolation with on-chip guarding.
- High Common-Mode Rejection Ratio (CMRR): Offers superior CMRR, ensuring minimal interference from common-mode signals.
- High Power Supply Rejection Ratio (PSRR): Excellent PSRR reduces the impact of power supply variations on the amplifier's performance.
- Standard Dual Op Amp Pin Configuration: Allows for easy upgrading of existing designs to higher performance levels.
Applications
- Critical Instrumentation: Suitable for the most demanding instrumentation applications where high precision and low noise are crucial.
- Medical Equipment: Used in medical devices that require high accuracy and reliability.
- Aerospace and Defense: Applied in various aerospace and defense systems where precision and stability are essential.
- Industrial Automation: Utilized in industrial automation systems for precise signal processing and amplification.
- Scientific Instruments: Employed in scientific instruments that demand high precision and low noise levels.
Q & A
- What is the typical input offset voltage of the OPA2111SM?
The typical input offset voltage of the OPA2111SM is ±0.08 mV.
- What is the operating temperature range for the OPA2111SM?
The operating temperature range for the OPA2111SM is –55°C to +125°C.
- What is the maximum supply voltage for the OPA2111SM?
The maximum supply voltage for the OPA2111SM is ±18VDC.
- How does the OPA2111SM achieve low noise levels?
The OPA2111SM achieves low noise levels through patented circuit design techniques and a cascode design.
- What is the common-mode rejection ratio (CMRR) of the OPA2111SM?
The CMRR of the OPA2111SM is typically around 110 dB to 120 dB.
- What are some typical applications of the OPA2111SM?
The OPA2111SM is typically used in critical instrumentation, medical equipment, aerospace and defense systems, industrial automation, and scientific instruments.
- How does the OPA2111SM reduce bias current?
The OPA2111SM reduces bias current through dielectric isolation with on-chip guarding.
- What is the power supply rejection ratio (PSRR) of the OPA2111SM?
The PSRR of the OPA2111SM is typically around 100 dB to 120 dB.
- Can the OPA2111SM be used to upgrade existing designs?
Yes, the OPA2111SM has a standard dual op amp pin configuration that allows for easy upgrading of existing designs to higher performance levels.
- What is the input noise voltage of the OPA2111SM at 1 kHz?
The input noise voltage of the OPA2111SM at 1 kHz is typically around 8 nV/√Hz to 15 nV/√Hz.
