Overview
The OPA277U/2K5 is a high-precision operational amplifier produced by Texas Instruments. This device is part of the OPAx277 series, which replaces the industry standard OP-177. The OPA277U/2K5 offers improved noise performance, a wider output voltage swing, and is twice as fast as its predecessor while consuming half the quiescent current. It is known for its ultra-low offset voltage and drift, low bias current, and high common-mode rejection ratio, making it suitable for a wide range of precision applications.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Input Offset Voltage (VOS) | ±10 | ±20 | ±50 | µV |
| Input Offset Voltage Drift (dVOS/dT) | ±0.1 | ±0.15 | ±0.5 | µV/°C |
| Open-Loop Gain | - | 134 | - | dB |
| Common-Mode Rejection Ratio (CMRR) | 130 | 140 | - | dB |
| Power-Supply Rejection Ratio (PSRR) | 130 | - | - | dB |
| Bias Current | - | 1 | - | nA |
| Supply Voltage Range | ±2 V | - | ±18 V | V |
| Quiescent Current | - | 800 | - | µA/amplifier |
| Package | - | 8-SOIC | - | - |
Key Features
- Ultra-low offset voltage: 10 µV
- Ultra-low drift: ±0.1 µV/°C
- High open-loop gain: 134 dB
- High common-mode rejection ratio: 140 dB
- High power-supply rejection ratio: 130 dB
- Low bias current: 1 nA maximum
- Wide supply range: ±2 V to ±18 V
- Low quiescent current: 800 µA/amplifier
- Single, dual, and quad versions available
- Unity-gain stable and free from phase inversion
- External trim pins for special applications (single version)
Applications
- Analog input modules
- Weigh scales
- Temperature transmitters
- Pressure transmitters
- Data acquisition (DAQ) systems
- Lab and field instrumentation
- Battery test equipment
Q & A
- What is the input offset voltage of the OPA277U/2K5?
The input offset voltage is typically ±20 µV, with a maximum of ±50 µV for some versions.
- What is the input offset voltage drift of the OPA277U/2K5?
The input offset voltage drift is typically ±0.1 µV/°C, with a maximum of ±0.5 µV/°C for some versions.
- What is the open-loop gain of the OPA277U/2K5?
The open-loop gain is 134 dB.
- What is the common-mode rejection ratio (CMRR) of the OPA277U/2K5?
The CMRR is typically 140 dB.
- What is the power-supply rejection ratio (PSRR) of the OPA277U/2K5?
The PSRR is 130 dB.
- What is the bias current of the OPA277U/2K5?
The bias current is a maximum of 1 nA.
- What is the supply voltage range of the OPA277U/2K5?
The supply voltage range is ±2 V to ±18 V.
- What is the quiescent current of the OPA277U/2K5?
The quiescent current is 800 µA per amplifier.
- Is the OPA277U/2K5 unity-gain stable?
Yes, the OPA277U/2K5 is unity-gain stable and free from phase inversion.
- What are some common applications of the OPA277U/2K5?
Common applications include analog input modules, weigh scales, temperature transmitters, pressure transmitters, data acquisition systems, lab and field instrumentation, and battery test equipment).
