Overview
The OPA2111KM 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 OPA2111KM features very low bias current, low offset and drift, and extremely low noise, achieved through patented circuit design techniques and laser trimming of thin-film resistors. Its cascode design enhances input specifications and reduces susceptibility to flicker noise.
Key Specifications
| Parameter | Condition | MIN | TYP | 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 | |
| Supply Rejection | 86 | 100 | dB | ||
| Temperature Range | Ambient Temp. | –55 | +125 | °C |
Key Features
- High precision monolithic dielectrically isolated FET (Difet) operational amplifier.
- Very low bias current due to dielectric isolation with on-chip guarding.
- Laser trimming of thin-film resistors for very low offset and drift.
- Extremely low noise achieved through patented circuit design techniques.
- Cascade design for high precision input specifications and reduced susceptibility to flicker noise.
- Standard dual op amp pin configuration for easy upgrading of existing designs.
- No special input protection needed due to dielectric isolation.
Applications
- Critical instrumentation applications.
- High impedance 60Hz reject filters.
- FET input instrumentation amplifiers.
- RIAA equalized stereo preamplifiers.
- Sensitive photodiode amplifiers.
- Fourth-order Butterworth low-pass filters.
Q & A
- What is the OPA2111KM?
The OPA2111KM is a high precision monolithic dielectrically isolated FET (Difet) operational amplifier produced by Texas Instruments.
- What are the key features of the OPA2111KM?
Key features include very low bias current, low offset and drift, extremely low noise, and a cascode design for high precision input specifications.
- What is the typical input noise voltage of the OPA2111KM at 1kHz?
The typical input noise voltage at 1kHz is 8 nV/√Hz.
- What is the average drift of the OPA2111KM?
The average drift is ±2 µV/°C.
- What is the supply rejection of the OPA2111KM?
The supply rejection is typically 100 dB.
- What is the temperature range for the OPA2111KM?
The temperature range is from –55°C to +125°C.
- Does the OPA2111KM require special input protection?
No, due to its dielectric isolation, no special input protection is needed.
- What are some common applications of the OPA2111KM?
Common applications include critical instrumentation, high impedance 60Hz reject filters, FET input instrumentation amplifiers, RIAA equalized stereo preamplifiers, and sensitive photodiode amplifiers.
- How is the offset voltage of the OPA2111KM adjusted?
The offset voltage is laser-trimmed and typically requires no further adjustment. However, it can be trimmed by summing if necessary.
- What is the common-mode rejection ratio (CMRR) of the OPA2111KM?
The CMRR is approximately 106 dB.
