Overview
The OP297GS, 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 consumption and extremely low input bias current, all packaged in an industry-standard 8-lead SOIC package. This combination makes the OP297GS highly versatile and suitable for a wide range of applications. The device features 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 | 25 | 50 | 200 | μV | |
| Average Input Offset Voltage Drift | TCVOS | 0.2 | 0.6 | 2.0 | μV/°C | |
| Input Offset Current | IOS | VCM = 0 V | 20 | 100 | 200 | pA |
| Input Bias Current | IB | VCM = 0 V | 20 | 100 | 450 | pA |
| Large Signal Voltage Gain | AVO | VOUT = ±10 V, RL = 2 kΩ | 1000 | 2500 | 3200 | V/mV |
| Supply Current (per amplifier) | ISY | 625 | μA | |||
| Common-Mode Rejection | CMR | 120 | dB | |||
| Supply Voltage Range | V+ | ±2 V | ±20 V |
Key Features
- Low Offset Voltage: Less than 50 μV, ensuring high precision in applications.
- Low Offset Voltage Drift: Below 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, thanks to the super-beta input stage with bias current cancellation.
- High Open-Loop Gain: Exceeds 2000 V/mV, ensuring high linearity in every application.
- Low Supply Current: Under 625 μA per amplifier, making it suitable for battery-powered systems.
- High Common-Mode Rejection: Over 120 dB, minimizing offset voltage changes due to common-mode signals.
- Wide Supply Voltage Range: Operates from ±2 V to ±20 V supplies.
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 and low bias current are key for accurate measurements.
- Photocurrent Monitors: Suitable for applications requiring low noise and high sensitivity.
- High Gain Linearity Amplifiers: Ensures high accuracy in high closed-loop gain applications.
- Long-Term Integrators/Filters: Stability and low drift are crucial for these applications.
- Sample-and-Hold Amplifiers: Precision and low bias current are essential.
- Peak Detectors: High gain and low noise make it suitable for peak detection.
- Logarithmic Amplifiers: Precision and stability are necessary for logarithmic operations.
- Battery-Powered Systems: Low supply current and high common-mode rejection make it ideal for battery-powered systems.
Q & A
- What is the typical input offset voltage of the OP297GS?
The typical input offset voltage of the OP297GS is 50 μV.
- What is the maximum input bias current of the OP297GS at 25°C?
The maximum input bias current of the OP297GS at 25°C is under 100 pA.
- What is the common-mode rejection ratio (CMR) of the OP297GS?
The CMR of the OP297GS is over 120 dB.
- What is the supply current per amplifier for the OP297GS?
The supply current per amplifier for the OP297GS is under 625 μA.
- What is the operating supply voltage range for the OP297GS?
The OP297GS operates from ±2 V to ±20 V supplies.
- What are some typical applications of the OP297GS?
The OP297GS is typically used in strain gage and bridge amplifiers, high stability thermocouple amplifiers, instrumentation amplifiers, photocurrent monitors, and other precision applications.
- What package type is the OP297GS available in?
The OP297GS is available in an 8-lead SOIC package.
- How does the OP297GS maintain low bias current over temperature?
The OP297GS uses a super-beta input stage with bias current cancellation to maintain picoamp bias currents at all temperatures.
- What is the open-loop gain of the OP297GS?
The open-loop gain of the OP297GS exceeds 2000 V/mV.
- Is the OP297GS suitable for battery-powered systems?
Yes, the OP297GS is suitable for battery-powered systems due to its low supply current and high common-mode rejection.
