Overview
The OPA277PAG4, part of the OPAx277 series from Texas Instruments, is a high-precision operational amplifier designed to replace industry-standard op-amps like the OP-177. These devices offer improved noise performance, a wider output voltage swing, and are twice as fast with half the quiescent current compared to their predecessors. The OPA277PAG4 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 |
|---|---|---|---|---|---|
| Input Offset Voltage (VOS) | TA = 25°C, VS = 10 V to 30 V | ±10 | ±20 | µV | |
| Input Offset Voltage Drift (dVOS/dT) | TA = –40°C to +85°C | ±0.1 | ±0.15 | µV/°C | |
| Common-Mode Rejection Ratio (CMRR) | VCM = (V–) + 2 V to (V+) – 2 V | 130 | 140 | dB | |
| Power-Supply Rejection Ratio (PSRR) | VCM = (V–) + 2 V to (V+) – 2 V | 130 | 140 | dB | |
| Bias Current | TA = 25°C | 1 | nA | ||
| Quiescent Current | TA = 25°C | 800 | µA/amplifier | ||
| Supply Voltage Range | ±2 V | ±18 V | |||
| Unity-Gain Bandwidth | 1 | MHz |
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 only)
Applications
- Analog input modules
- Weigh scales
- Temperature transmitters
- Pressure transmitters
- Data acquisition (DAQ) systems
- Lab and field instrumentation
- Battery testing
- High-voltage industrial applications
Q & A
- What is the typical input offset voltage of the OPA277PAG4?
The typical input offset voltage is ±20 μV. - What is the input offset voltage drift of the OPA277PAG4?
The input offset voltage drift is ±0.1 μV/°C. - What is the common-mode rejection ratio (CMRR) of the OPA277PAG4?
The CMRR is 140 dB. - What is the power-supply rejection ratio (PSRR) of the OPA277PAG4?
The PSRR is 130 dB. - What is the bias current of the OPA277PAG4?
The bias current is 1 nA maximum. - What is the quiescent current of the OPA277PAG4?
The quiescent current is 800 μA per amplifier. - What is the supply voltage range of the OPA277PAG4?
The supply voltage range is ±2 V to ±18 V. - Is the OPA277PAG4 unity-gain stable?
Yes, the OPA277PAG4 is unity-gain stable and free from phase inversion and overload problems. - Does the OPA277PAG4 have external trim pins for offset voltage adjustment?
Yes, the OPA277 (single version) has external trim pins for offset voltage adjustment. - What are some typical applications of the OPA277PAG4?
Typical applications include analog input modules, weigh scales, temperature transmitters, pressure transmitters, DAQ systems, lab and field instrumentation, and battery testing).
