Overview
The OPA227UA, produced by Texas Instruments, is a high-precision, low-noise operational amplifier. It is part of the OPAx227 series, which combines low noise and wide bandwidth with high precision, making it an excellent choice for applications requiring both AC and precision DC performance. The OPA227UA is unity-gain stable, featuring a high slew rate of 2.3 V/μs and a wide bandwidth of 8 MHz. This op-amp is designed to replace industry-standard OP27 and OP37 with substantial improvements across various parameters. It is available in single, dual, and quad versions, and comes in DIP-8 and SO-8 packages, making it suitable for space-saving and cost-effective designs.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Input Offset Voltage (VOS) | TA = +25°C, VS = ±5 V to ±15 V | ±5 | ±75 | ±100 | µV |
| Input Offset Voltage Drift (dVOS/dT) | TA = –40°C to +85°C | ±0.1 | - | - | µV/°C |
| Common-Mode Rejection Ratio (CMRR) | (V–) + 2 V < VCM < (V+) – 2 V | 120 | 138 | - | dB |
| Open-Loop Gain (AOL) | (V–) + 2 V < VO < (V+) – 2 V, RL = 10 kΩ | 132 | 160 | - | dB |
| Slew Rate (SR) | - | - | 2.3 | - | V/μs |
| Bandwidth (GBW) | - | - | 8 | - | MHz |
| Quiescent Current (IQ) | IO = 0 A, TA = –40°C to +85°C | ±3.7 | ±3.8 | ±4.2 | mA |
| Supply Range | - | - | ±2.5 V to ±18 V | - | - |
Key Features
- Low noise: 3 nV/√Hz
- Wide bandwidth: 8 MHz
- High slew rate: 2.3 V/μs
- High common-mode rejection ratio (CMRR): 138 dB
- High open-loop gain: 160 dB
- Low input bias current: 10 nA maximum
- Low offset voltage: 75 µV maximum
- Wide supply range: ±2.5 V to ±18 V
- Low quiescent current: ±3.8 mA per amplifier
- Available in single, dual, and quad versions
- Pin-for-pin replacements for industry-standard OP27 and OP37
Applications
- Data acquisition (DAQ)
- Condition monitoring sensors
- Spectrum analyzers
- Professional audio amplifiers (rack mount)
- Industrial AC-DC applications
- Portable applications requiring high precision
Q & A
- What is the input offset voltage of the OPA227UA?
The input offset voltage of the OPA227UA is typically ±75 µV, with a maximum of ±100 µV at TA = +25°C, VS = ±5 V to ±15 V.
- What is the common-mode rejection ratio (CMRR) of the OPA227UA?
The CMRR of the OPA227UA is 138 dB.
- What is the slew rate of the OPA227UA?
The slew rate of the OPA227UA is 2.3 V/μs.
- What is the bandwidth of the OPA227UA?
The bandwidth of the OPA227UA is 8 MHz.
- What is the quiescent current of the OPA227UA?
The quiescent current of the OPA227UA is typically ±3.8 mA per amplifier.
- What are the available package types for the OPA227UA?
The OPA227UA is available in DIP-8 and SO-8 packages.
- What are some typical applications of the OPA227UA?
Typical applications include data acquisition (DAQ), condition monitoring sensors, spectrum analyzers, professional audio amplifiers, and industrial AC-DC applications.
- Can the OPA227UA replace other industry-standard op-amps?
Yes, the OPA227UA is a pin-for-pin replacement for industry-standard OP27 and OP37 with substantial improvements.
- What is the supply range of the OPA227UA?
The supply range of the OPA227UA is ±2.5 V to ±18 V.
- Is the OPA227UA suitable for portable applications?
Yes, the OPA227UA is suitable for portable applications due to its low quiescent current and high precision.
