Overview
The OPA2228U/2K5 is a dual, high-precision, low-noise operational amplifier produced by Texas Instruments. This component is part of the OPAx227 and OPAx228 series, which are known for their excellent ac and precision dc performance. The OPA2228 is particularly optimized for closed-loop gains of 5 or greater, offering high slew rates and wide bandwidth, making it an excellent choice for various applications requiring high precision and low noise.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Input Offset Voltage (VOS) | TA = +25°C | ±5 | ±75 | ±200 | µV |
| Input Bias Current | TA = +25°C | - | 10 | - | nA |
| Bandwidth | - | - | 33 MHz (OPA228) | - | MHz |
| Slew Rate | - | - | 10 V/µs (OPA228) | - | V/µs |
| Settling Time | - | - | 5 µs | - | µs |
| Common Mode Rejection Ratio (CMRR) | - | - | 138 dB | - | dB |
| Open-Loop Gain | - | - | 160 dB | - | dB |
| Supply Voltage Range | - | ±2.5 V | - | ±18 V | V |
| Operating Temperature Range | - | -40°C | - | 85°C | °C |
| Package | - | - | SOIC (D) 8-pin | - | - |
Key Features
- Low Noise: 3 nV/√Hz, making it suitable for high-precision applications.
- Wide Bandwidth: OPA228: 33 MHz, 10 V/µs; OPA227: 8 MHz, 2.3 V/µs.
- Settling Time: 5 µs, which is a significant improvement over older models like the OP-27.
- High CMRR: 138 dB, ensuring minimal common-mode noise.
- High Open-Loop Gain: 160 dB, providing high accuracy in amplification.
- Low Input Bias Current: 10 nA maximum, reducing the impact of input bias on the signal.
- Low Offset Voltage: 75 µV maximum, ensuring minimal offset in the output signal.
- Wide Supply Range: ±2.5 V to ±18 V, allowing flexibility in power supply configurations.
- Single, Dual, and Quad Versions: Available in various configurations to suit different application needs.
Applications
- Data Acquisition (DAQ): Ideal for high-precision data acquisition systems.
- Condition Monitoring Sensors: Suitable for sensors that require high accuracy and low noise.
- Spectrum Analyzers: Used in spectrum analysis due to its high bandwidth and low noise characteristics.
- Professional Audio Equipment: Excellent choice for professional audio amplifiers, especially rack-mounted systems.
- Industrial AC-DC Applications: Suitable for various industrial applications requiring high precision and reliability.
- Portable Applications: Low quiescent current and low cost make it an excellent choice for portable devices requiring high precision.
Q & A
- What is the typical noise level of the OPA2228U/2K5?
The typical noise level is 3 nV/√Hz.
- What are the bandwidth and slew rate of the OPA228 series?
The bandwidth is 33 MHz, and the slew rate is 10 V/µs.
- What is the settling time of the OPA2228U/2K5?
The settling time is 5 µs.
- What is the common mode rejection ratio (CMRR) of the OPA2228U/2K5?
The CMRR is 138 dB.
- What is the open-loop gain of the OPA2228U/2K5?
The open-loop gain is 160 dB.
- What is the input bias current of the OPA2228U/2K5?
The input bias current is 10 nA maximum.
- What is the operating temperature range of the OPA2228U/2K5?
The operating temperature range is –40°C to +85°C.
- What package types are available for the OPA2228U/2K5?
The OPA2228U/2K5 is available in SOIC (D) 8-pin packages.
- Can the OPA2228U/2K5 be used in professional audio equipment?
Yes, it is an excellent choice for professional audio equipment due to its high precision and low noise characteristics.
- Are there single, dual, and quad versions of the OPA2228U/2K5 available?
Yes, the OPAx227 and OPAx228 series are available in single, dual, and quad versions.
