Overview
The OPA2277MDTEP is a high-precision, low-noise operational amplifier produced by Texas Instruments. It replaces the industry standard OP-177 and offers significant improvements in noise performance, output voltage swing, and speed. The OPA2277 operates from a wide supply range of ±2 to ±18 volts, maintaining high performance across various supply voltages. It is stable in unity gain and provides excellent dynamic behavior over a wide range of load conditions. This operational amplifier is particularly noted for its ultra-low offset voltage, low bias current, high common-mode rejection, and high power-supply rejection, making it suitable for demanding applications in defense, aerospace, and medical fields.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Input Offset Voltage (VOS) | TJ = –55°C to 125°C | ±20 | ±65 | ±150 | µV |
| Input Offset Voltage Drift (dVOS/dT) | TJ = –55°C to 125°C | ±0.15 | µV/°C | ||
| Open-Loop Gain | 134 | dB | |||
| Common-Mode Rejection Ratio (CMRR) | 140 | dB | |||
| Power Supply Rejection Ratio (PSRR) | VS = ±2 V to ±18 V | ±1 | µV/V | ||
| Input Bias Current (IB) | TJ = –55°C to 125°C | ±0.5 | ±2.8 | ±7 | nA |
| Quiescent Current (IQ) | IO = 0 A, TJ = –55°C to 125°C | ±790 | ±825 | ±900 | µA |
| Operating Temperature Range | –55 | 125 | °C | ||
| Storage Temperature Range | –55 | 125 | °C |
Key Features
- Ultra-Low Offset Voltage: 10 µV, with a drift of ±0.1 µV/°C.
- High Open-Loop Gain: 134 dB, ensuring high precision in amplification.
- High Common-Mode Rejection Ratio (CMRR): 140 dB, providing excellent rejection of common-mode signals.
- High Power Supply Rejection Ratio (PSRR): 130 dB, minimizing the impact of power supply variations.
- Low Bias Current: Maximum of 1 nA, reducing the impact on input signals.
- Wide Supply Range: Operates from ±2 to ±18 volts, with specifications ensured over the ±5 to ±15 volts range.
- Low Quiescent Current: 800 µA per amplifier, making it efficient for battery-powered applications.
- Stable in Unity Gain: Free from phase inversion and overload problems, with excellent dynamic behavior.
- Independent Circuitry: Lowest crosstalk and freedom from interaction, even when overdriven or overloaded.
Applications
- Transducer Amplifier: Ideal for amplifying signals from transducers in various measurement systems.
- Bridge Amplifier: Suitable for bridge configurations such as strain gage and load cell applications.
- Temperature Measurements: Used in precision temperature measurement circuits.
- Precision Integrator: Can be used in integrator circuits requiring high precision and low noise.
- Battery-Powered Instruments: Efficient for use in battery-powered devices due to its low quiescent current.
- Test Equipment: Utilized in various test and measurement equipment requiring high precision and stability.
Q & A
- What is the input offset voltage of the OPA2277?
The input offset voltage of the OPA2277 is ±20 µV, with a drift of ±0.15 µV/°C.
- What is the open-loop gain of the OPA2277?
The open-loop gain of the OPA2277 is 134 dB.
- What is the common-mode rejection ratio (CMRR) of the OPA2277?
The CMRR of the OPA2277 is 140 dB.
- What is the power supply rejection ratio (PSRR) of the OPA2277?
The PSRR of the OPA2277 is 130 dB.
- What is the input bias current of the OPA2277?
The input bias current of the OPA2277 is a maximum of 1 nA.
- What is the operating temperature range of the OPA2277?
The operating temperature range of the OPA2277 is –55°C to 125°C.
- What is the storage temperature range of the OPA2277?
The storage temperature range of the OPA2277 is –55°C to 125°C.
- Is the OPA2277 stable in unity gain?
Yes, the OPA2277 is stable in unity gain and free from phase inversion and overload problems.
- What are some typical applications of the OPA2277?
The OPA2277 is used in transducer amplifiers, bridge amplifiers, temperature measurements, precision integrators, battery-powered instruments, and test equipment.
- Does the OPA2277 require external bias current cancellation?
No, the OPA2277 does not require external bias current cancellation due to its internal compensation circuitry.
