Overview
The OPA277UA is a precision operational amplifier from Texas Instruments, part of the OPAx277 series. These devices are designed to replace industry-standard op-amps like the OP-177, offering improved noise performance, a wider output voltage swing, and twice the speed with half the quiescent current. The OPA277UA is known for its ultra-low offset voltage and drift, low bias current, high common-mode rejection, and high power-supply rejection. It operates from a wide supply range of ±2 V to ±18 V, making it versatile for various real-world applications.
Key Specifications
| Parameter | Typical Value | Maximum Value | Unit |
|---|---|---|---|
| Input Offset Voltage (VOS) | ±10 µV | ±20 µV | µV |
| Input Offset Voltage Drift (dVOS/dT) | ±0.1 µV/°C | ±0.15 µV/°C | µV/°C |
| Open-Loop Gain | 134 dB | dB | |
| Common-Mode Rejection Ratio (CMRR) | 140 dB | dB | |
| Power-Supply Rejection Ratio (PSRR) | 130 dB | dB | |
| Input Bias Current (IB) | ±0.5 nA | ±1 nA | nA |
| Quiescent Current | 800 µA/amplifier | µA | |
| Operating Temperature Range | -40°C to 85°C | °C | |
| Package Type | SOIC (D), 8 pins |
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
- Replaces OP-07, OP-77, and OP-177
- Unity-gain stable and free from phase inversion and overload problems
- Completely independent circuitry in dual and quad versions for minimal crosstalk
Applications
- Analog input modules
- Weigh scales
- Temperature transmitters
- Pressure transmitters
- Data acquisition (DAQ) systems
- Lab and field instrumentation
- Battery testing
Q & A
- What is the typical input offset voltage of the OPA277UA?
The typical input offset voltage is ±10 µV.
- What is the operating temperature range of the OPA277UA?
The operating temperature range is -40°C to 85°C.
- What is the common-mode rejection ratio (CMRR) of the OPA277UA?
The CMRR is 140 dB.
- What is the power-supply rejection ratio (PSRR) of the OPA277UA?
The PSRR is 130 dB.
- What is the quiescent current of the OPA277UA?
The quiescent current is 800 µA per amplifier.
- Does the OPA277UA have external trim pins for offset voltage adjustment?
Yes, the single version (OPA277) provides external trim pins for special applications.
- Is the OPA277UA unity-gain stable?
Yes, the OPA277UA is unity-gain stable and free from phase inversion and overload problems.
- What are the package options for the OPA277UA?
The OPA277UA is available in SOIC (D) with 8 pins).
- Can the OPA277UA operate with different supply voltages?
Yes, it operates from ±2 V to ±18 V with excellent performance across the supply range).
- What are some common applications of the OPA277UA?
Common applications include analog input modules, weigh scales, temperature transmitters, pressure transmitters, data acquisition systems, lab and field instrumentation, and battery testing).
