Overview
The OPA277U/2K5G4 is a high-precision operational amplifier from Texas Instruments, part of the OPAx277 series. These devices are designed to replace industry-standard operational amplifiers like the OP-177, offering improved performance in terms of noise, output voltage swing, and speed, while reducing quiescent current. The OPA277U/2K5G4 is known for its ultra-low offset voltage and drift, low bias current, high common-mode rejection, and high power-supply rejection, making it suitable for a wide range of precision applications.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| OFFSET VOLTAGE (VOS) | TA = 25°C, VS = 10 V to 30 V, VCM = VOUT = VS / 2, and RL = 2 kΩ connected to VS / 2 | ±10 | ±20 | µV | |
| INPUT OFFSET VOLTAGE DRIFT (dVOS/dT) | TA = –40°C to +85°C | ±0.1 | ±0.15 | µV/°C | |
| POWER-SUPPLY REJECTION RATIO (PSRR) | VS = ±2 V to ±18 V | 130 | 140 | dB | |
| INPUT BIAS CURRENT (IB) | TA = 25°C, VS = 10 V to 30 V | ±0.5 | ±1 | nA | |
| COMMON-MODE VOLTAGE RANGE (VCM) | (V–) + 2 to (V+) – 2 | V | |||
| COMMON-MODE REJECTION RATIO (CMRR) | VCM = (V–) + 2 V to (V+) – 2 V | 130 | 140 | dB | |
| SUPPLY VOLTAGE RANGE | ±2 V to ±18 V | V | |||
| QUIESCENT CURRENT | Per amplifier | 800 | µA |
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: 140 dB
- High power-supply rejection: 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 and overload problems
- External trim pins for offset voltage adjustment (OPA277)
Applications
- Analog input modules
- Weigh scales
- Temperature transmitters
- Pressure transmitters
- Data acquisition (DAQ)
- Lab and field instrumentation
- Battery testing
- High-voltage industrial applications
Q & A
- What is the typical offset voltage of the OPA277U/2K5G4?
The typical offset voltage is ±20 μV.
- What is the input offset voltage drift of the OPA277U/2K5G4?
The input offset voltage drift is ±0.1 μV/°C.
- What is the power-supply rejection ratio (PSRR) of the OPA277U/2K5G4?
The PSRR is 130 dB to 140 dB.
- What is the input bias current of the OPA277U/2K5G4?
The input bias current is ±0.5 nA to ±1 nA.
- What is the common-mode rejection ratio (CMRR) of the OPA277U/2K5G4?
The CMRR is 130 dB to 140 dB.
- What is the supply voltage range for the OPA277U/2K5G4?
The supply voltage range is ±2 V to ±18 V.
- What is the quiescent current per amplifier for the OPA277U/2K5G4?
The quiescent current per amplifier is 800 μA.
- Is the OPA277U/2K5G4 unity-gain stable?
Yes, the OPA277U/2K5G4 is unity-gain stable and free from phase inversion and overload problems.
- What types of packages are available for the OPA277U/2K5G4?
The OPA277U/2K5G4 is available in SOIC, VSON, and PDIP packages.
- What are some typical applications for the OPA277U/2K5G4?
Typical applications include analog input modules, weigh scales, temperature transmitters, pressure transmitters, data acquisition (DAQ), lab and field instrumentation, and battery testing.
