Overview
The OPA2111KP 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 OPA2111KP 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. The standard dual op amp pin configuration allows for easy upgrading of existing designs to higher performance levels.
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 Noise Voltage (fO = 10kHz) | 100% Tested | 6 | 8 | 6 | 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.
- Extremely low noise achieved through patented circuit design techniques.
- Laser trimming of thin-film resistors for very low offset and drift.
- Cascade design for high precision input specifications and reduced susceptibility to flicker noise.
- No special protection needed due to dielectric isolation, eliminating the need for external current-limiting resistors.
- Standard dual op amp pin configuration for easy upgrading of existing designs.
Applications
- Critical instrumentation applications requiring high precision and low noise.
- Sensitive photodiode amplifiers.
- RIAA equalized stereo preamplifiers.
- High impedance 60Hz reject filters with gain.
- FET input instrumentation amplifiers.
- Parallel-input amplifiers.
- Low-pass filters and other precision analog circuits.
Q & A
- What is the OPA2111KP? The OPA2111KP is a high precision monolithic dielectrically isolated FET (Difet) operational amplifier produced by Texas Instruments.
- What are the key performance characteristics of the OPA2111KP? It features very low bias current, low offset and drift, and extremely low noise.
- How is the low noise achieved in the OPA2111KP? The low noise is achieved through patented circuit design techniques and laser trimming of thin-film resistors.
- What is the temperature range for the OPA2111KP? The temperature range is from –55°C to +125°C.
- Does the OPA2111KP require special input protection? No, due to its dielectric isolation, no special protection is needed, eliminating the need for external current-limiting resistors.
- What are some common applications of the OPA2111KP? It is used in critical instrumentation applications, sensitive photodiode amplifiers, RIAA equalized stereo preamplifiers, high impedance 60Hz reject filters, and FET input instrumentation amplifiers.
- How does the OPA2111KP compare to BIFET amplifiers? The OPA2111KP has superior performance characteristics compared to BIFET amplifiers, including lower noise, bias current, voltage offset, and drift.
- Can the OPA2111KP be used in existing designs? Yes, its standard dual op amp pin configuration allows for easy upgrading of existing designs to higher performance levels.
- What is the typical input offset voltage of the OPA2111KP? The typical input offset voltage is ±0.22 mV.
- How does the OPA2111KP handle thermal shock? The OPA2111KP has minimal offset voltage change due to thermal shock, ensuring stable performance under varying temperature conditions.
