Overview
The OP491GS-REEL, produced by Analog Devices Inc., is a quad micropower, single-supply operational amplifier featuring rail-to-rail inputs and outputs. This amplifier is part of the OPx91 family, which includes single (OP191), dual (OP291), and quad (OP491) configurations. The OP491 is fabricated on Analog Devices’ CBCMOS process and is designed to operate from a single supply of 2.7 V to 12 V, as well as from ±5 V dual supplies. It is known for its wide input voltage range, low supply current, and high bandwidth, making it suitable for a variety of applications requiring precision and reliability.
Key Specifications
| Parameter | Typical Value | Minimum Value | Maximum Value |
|---|---|---|---|
| Supply Voltage | - | 2.7 V | 12 V |
| Input Voltage Range | - | GND to VS + 10 V | - |
| Supply Current per Amplifier | 300 μA | 260 μA | 420 μA |
| Bandwidth | 3 MHz | - | - |
| Slew Rate | 0.5 V/μs | - | - |
| Offset Voltage | 700 μV | - | - |
| Output Voltage High (RL = 100 kΩ to GND) | - | 4.90 V | 4.98 V |
| Output Voltage Low (RL = 100 kΩ to GND) | - | 0.02 V | 0.10 V |
| Common-Mode Rejection Ratio (CMRR) | - | 65 dB | 90 dB |
| Power Supply Rejection Ratio (PSRR) | - | 75 dB | 100 dB |
| Operating Temperature Range | - | -40°C | +125°C |
Key Features
- Single-Supply Operation: The OP491 can operate from a single supply of 2.7 V to 12 V and from ±5 V dual supplies.
- Rail-to-Rail Inputs and Outputs: The amplifier features rail-to-rail input and output stages, allowing the input voltage to safely extend 10 V beyond either supply without phase inversion or latch-up.
- Low Supply Current: Each amplifier consumes a low supply current of 300 μA.
- Wide Bandwidth: The OP491 has a bandwidth of 3 MHz and a slew rate of 0.5 V/μs.
- Low Offset Voltage: The amplifier has a low offset voltage of 700 μV.
- No Phase Reversal: The unique input stage prevents phase reversal even when the input voltage exceeds the supply voltage.
Applications
- Portable Telecommunications Equipment: Suitable for battery-powered devices due to its low power consumption.
- Power Supply Control and Protection: Used in power supply circuits for control and protection functions.
- Industrial Process Control: Ideal for industrial applications requiring precision and reliability.
- Remote Sensors: Used in remote sensing applications, including Hall effect, piezo electric, and resistive transducers.
- Low Voltage Strain Gage Amplifiers: Suitable for strain gage applications where low voltage operation is necessary.
- DAC Output Amplifiers: Used as output amplifiers for Digital-to-Analog Converters (DACs).
Q & A
- What is the supply voltage range for the OP491GS-REEL?
The OP491GS-REEL can operate from a single supply of 2.7 V to 12 V and from ±5 V dual supplies.
- What is the typical supply current per amplifier for the OP491GS-REEL?
The typical supply current per amplifier is 300 μA.
- What is the bandwidth of the OP491GS-REEL?
The bandwidth of the OP491GS-REEL is 3 MHz.
- Does the OP491GS-REEL have rail-to-rail input and output capabilities?
Yes, the OP491GS-REEL features rail-to-rail inputs and outputs.
- What is the slew rate of the OP491GS-REEL?
The slew rate of the OP491GS-REEL is 0.5 V/μs.
- What are some common applications for the OP491GS-REEL?
Common applications include portable telecommunications equipment, power supply control and protection, industrial process control, remote sensors, and low voltage strain gage amplifiers.
- What is the operating temperature range for the OP491GS-REEL?
The operating temperature range is from -40°C to +125°C.
- What packages are available for the OP491GS-REEL?
The OP491GS-REEL is available in 14-lead PDIP, narrow 14-lead SOIC, and 14-lead TSSOP packages.
- Does the OP491GS-REEL have any special input stage features?
Yes, the OP491GS-REEL has a unique input stage that allows the input voltage to safely extend 10 V beyond either supply without phase inversion or latch-up.
- What is the common-mode rejection ratio (CMRR) of the OP491GS-REEL?
The CMRR is typically between 65 dB and 90 dB.
