Overview
The OP297FS, 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 makes the OP297FS highly versatile and suitable for a wide range of applications. The amplifier features very low offset voltage (less than 50 μV), low drift (less than 0.6 μV/°C), and high open-loop gain (exceeding 2000 V/mV), ensuring high linearity and stability in various operating conditions.
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 | 1200 | 3200 | V/mV | |
| Supply Current (per amplifier) | ISY | 625 | μA | |||
| Common-Mode Rejection Ratio | CMR | 120 | dB | |||
| Operating Temperature Range | -40 | 85 | °C |
Key Features
- Very low input bias current: under 100 pA at 25°C and under 450 pA over the military temperature range.
- High open-loop gain: exceeding 2000 V/mV, ensuring high linearity.
- Low offset voltage: less than 50 μV, and low drift: less than 0.6 μV/°C.
- High common-mode rejection ratio: over 120 dB, minimizing offset voltage changes in battery-powered systems.
- Low supply current: under 625 μA per amplifier.
- Operates with supply voltages as low as ±2 V and can swing output to within 1 V of the rails.
- Super-beta input stage with bias current cancellation to maintain picoamp bias currents at all temperatures.
Applications
- Instrumentation amplifiers
- Log amplifiers
- Strain gage and bridge amplifiers
- High stability thermocouple amplifiers
- Photocurrent monitors
- High gain linearity amplifiers
- Long-term integrators/filters
- Sample-and-hold amplifiers
- Peak detectors
- Logarithmic amplifiers
- Battery-powered systems
Q & A
- What is the typical input offset voltage of the OP297FS?
The typical input offset voltage is less than 50 μV.
- What is the input bias current of the OP297FS at 25°C?
The input bias current is under 100 pA at 25°C.
- What is the common-mode rejection ratio of the OP297FS?
The common-mode rejection ratio is over 120 dB.
- What is the supply current per amplifier for the OP297FS?
The supply current is under 625 μA per amplifier.
- What is the operating temperature range of the OP297FS?
The operating temperature range is from -40°C to +85°C.
- Can the OP297FS operate with low supply voltages?
Yes, it can operate with supply voltages as low as ±2 V.
- What types of applications is the OP297FS suitable for?
The OP297FS is suitable for instrumentation amplifiers, log amplifiers, strain gage and bridge amplifiers, and many other precision applications.
- How does the OP297FS handle capacitive loading?
The OP297FS is extremely tolerant of capacitive loading on the output, displaying excellent response with 1000 pF loads.
- What package type is the OP297FS available in?
The OP297FS is available in an 8-lead SOIC package.
- Is the OP297FS pin-compatible with other op amps?
Yes, it is pin-compatible with op amps like LT1013, AD706, AD708, OP221, LM158, and MC1458/1558.
