Overview
The OPA228UA is a high-precision, low-noise operational amplifier produced by Texas Instruments. It is part of the OPAx228 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 OPA228UA is optimized for closed-loop gains of 5 or greater and offers higher speed with a slew rate of 10 V/µs and a bandwidth of 33 MHz. This operational amplifier is suitable for professional audio equipment and portable applications due to its low quiescent current and cost-effectiveness. It is also a pin-for-pin replacement for industry-standard OP27 and OP37 with substantial improvements.
Key Specifications
| Parameter | Typical Value | Unit |
|---|---|---|
| Input Offset Voltage (VOS) | ±75 µV | µV |
| Input Bias Current | 10 nA | nA |
| Common-Mode Rejection Ratio (CMRR) | 138 dB | dB |
| Open-Loop Gain (AOL) | 160 dB | dB |
| Bandwidth | 33 MHz | MHz |
| Slew Rate | 10 V/µs | V/µs |
| Settling Time (to 0.1%) | 5 µs | µs |
| Quiescent Current per Amplifier | ±3.8 mA | mA |
| Supply Voltage Range | ±2.5 V to ±18 V | V |
| Operating Temperature Range | –40°C to +85°C | °C |
| Package Type | SOIC (D), 8 pins |
Key Features
- Low noise: 3 nV/√Hz
- Wide bandwidth: 33 MHz
- High slew rate: 10 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
- Available in single, dual, and quad versions
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 typical input offset voltage of the OPA228UA?
The typical input offset voltage is ±75 µV.
- What is the slew rate of the OPA228UA?
The slew rate is 10 V/µs.
- What is the bandwidth of the OPA228UA?
The bandwidth is 33 MHz.
- What is the common-mode rejection ratio (CMRR) of the OPA228UA?
The CMRR is 138 dB.
- What is the operating temperature range of the OPA228UA?
The operating temperature range is –40°C to +85°C.
- What are the available package types for the OPA228UA?
The OPA228UA is available in SOIC (D) packages with 8 pins.
- What are some typical applications of the OPA228UA?
Typical applications include data acquisition, condition monitoring sensors, spectrum analyzers, professional audio amplifiers, and industrial AC-DC applications.
- Is the OPA228UA suitable for professional audio equipment?
Yes, it is an excellent choice for professional audio equipment due to its high precision and low noise characteristics.
- Can the OPA228UA be used in portable applications?
Yes, it is suitable for portable applications requiring high precision due to its low quiescent current and cost-effectiveness.
- Is the OPA228UA a pin-for-pin replacement for other operational amplifiers?
Yes, it is a pin-for-pin replacement for industry-standard OP27 and OP37 with substantial improvements.
