Overview
The OP297FS-REEL, produced by Analog Devices Inc., is a dual low bias current precision operational amplifier. It is the first dual op amp to combine precision performance with low power and extremely low input bias current in an industry-standard 8-lead SOIC package. This combination makes the OP297 highly versatile and suitable for a wide range of applications. The device is known for its very low offset voltage, low drift, and high open-loop gain, ensuring high linearity and accuracy in various operational scenarios.
Key Specifications
| Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Input Offset Voltage | VOS | TA = 25°C, VS = ±15V, VCM = 0V | 25 | 50 | 200 | µV |
| Long-Term Input Voltage Stability | - | - | 0.1 | 0.1 | 0.1 | µV/mo |
| Input Offset Current | IOS | VCM = 0 V | 20 | 100 | 200 | pA |
| Input Bias Current | IB | VCM = 0 V | 20 | 100 | 200 | pA |
| Open-Loop Gain | AVO | VOUT = ±10 V, RL = 2 kΩ | 1200 | 3200 | - | V/mV |
| Supply Current (per amplifier) | - | - | - | 625 | - | µA |
| Common-Mode Rejection | CMR | - | - | - | 120 | dB |
| Operating Temperature Range | - | - | -55°C | - | 125°C | °C |
Key Features
- Low Offset Voltage: Maximum of 50 µV, ensuring high precision in applications.
- Low Offset Voltage Drift: Less than 0.6 µV/°C, providing stability over temperature changes.
- Very Low Bias Current: Under 100 pA at 25°C and under 450 pA over the military temperature range, ideal for applications requiring minimal current draw.
- High Open-Loop Gain: Exceeds 2000 V/mV, ensuring high linearity in every application.
- Low Supply Current: Under 625 µA per amplifier, suitable for battery-powered systems.
- High Common-Mode Rejection: Over 120 dB, minimizing errors due to common-mode signals.
- Wide Operating Voltage Range: From ±2 V to ±20 V supplies, with very little operating headroom required about the supply rails.
Applications
- Strain Gage and Bridge Amplifiers: High precision and stability make it ideal for these applications.
- High Stability Thermocouple Amplifiers: Low drift and high common-mode rejection are beneficial here.
- Instrumentation Amplifiers: Precision performance and low bias current are key advantages.
- Photocurrent Monitors: Low bias current is crucial for accurate measurements.
- High Gain Linearity Amplifiers: High open-loop gain ensures high linearity.
- Long-Term Integrators/Filters: Precision and stability over time are essential.
- Sample-and-Hold Amplifiers: Low bias current and high precision are necessary.
- Peak Detectors and Logarithmic Amplifiers: High precision and low bias current are beneficial.
- Battery-Powered Systems: Low supply current and high common-mode rejection make it suitable.
Q & A
- What is the typical input offset voltage of the OP297?
The typical input offset voltage of the OP297 is 50 µV.
- What is the maximum input bias current of the OP297 over the military temperature range?
The maximum input bias current of the OP297 over the military temperature range is under 450 pA.
- What is the open-loop gain of the OP297?
The open-loop gain of the OP297 exceeds 2000 V/mV.
- What is the supply current per amplifier for the OP297?
The supply current per amplifier for the OP297 is under 625 µA.
- What is the common-mode rejection ratio (CMR) of the OP297?
The CMR of the OP297 is over 120 dB.
- What is the operating temperature range for the OP297?
The operating temperature range for the OP297 is from -55°C to +125°C for the OP297A, and from -40°C to +85°C for the OP297E and OP297F.
- Can the OP297 operate with low supply voltages?
Yes, the OP297 can operate with supply voltages as low as ±2 V.
- Is the OP297 suitable for battery-powered systems?
Yes, the OP297 is suitable for battery-powered systems due to its low supply current and high common-mode rejection.
- What types of applications benefit from the OP297's low bias current?
Applications such as sample-and-hold amplifiers, peak detectors, and logarithmic amplifiers benefit from the OP297's low bias current.
- How does the OP297's input stage contribute to its performance?
The OP297 uses a super-beta input stage with bias current cancellation, maintaining picoamp bias currents at all temperatures.
