Overview
The OPA145IDR, produced by Texas Instruments, is a high-precision, low-noise operational amplifier (op-amp) that is part of the OPAx145 family. This device is known for its excellent bandwidth and slew-rate-to-power ratio, making it an ideal choice for amplifying small signals from high-impedance sensors. The OPA145IDR features a rail-to-rail output swing, which allows it to interface seamlessly with modern single-supply precision analog-to-digital converters (ADCs) and digital-to-analog converters (DACs). Its low current noise and pico-ampere input bias current ensure high accuracy and reliability in various applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Gain Bandwidth Product | 5.5 | MHz |
| Slew Rate | 20 | V/μs |
| Supply Voltage (Dual Supply) | ±2.25 to ±18 | V |
| Supply Voltage (Single Supply) | 4.5 to 36 | V |
| Quiescent Current (per amplifier) | 445 to 475 | μA |
| Input Bias Current | ±2 to ±10 | pA |
| Input Voltage Noise (0.1 Hz to 10 Hz) | 320 | nVPP |
| Input Voltage Noise Density (at 1 kHz) | 7 | nV/√Hz |
| Common-Mode Voltage Range | (V–) – 0.1 to (V+) – 3.5 | V |
| Operating Temperature | –40 to 125 | °C |
| Output Short-Circuit Current | ±20 | mA |
Key Features
- High gain bandwidth product of 5.5 MHz and a slew rate of 20 V/μs, providing excellent bandwidth and slew-rate-to-power ratio.
- Low supply current of 445 to 475 μA, making it suitable for low-power applications.
- Pico-ampere input bias current and low current noise, ideal for amplifying small signals from high-impedance sensors.
- Rail-to-rail output swing, allowing for seamless interface with single-supply precision ADCs and DACs.
- Wide operating temperature range from –40°C to 125°C.
- High common-mode rejection ratio (CMRR) and power-supply rejection ratio (PSRR), ensuring minimal interference from power supply noise.
Applications
- Amplifying small signals from high-impedance sensors in industrial, medical, and scientific instruments.
- Interface with single-supply precision ADCs and DACs in data acquisition systems.
- Transimpedance amplifiers for photodiode and other current-sensing applications.
- Audio and video signal processing where low noise and high accuracy are required.
- Medical devices such as ECG and EEG amplifiers.
Q & A
- What is the gain bandwidth product of the OPA145IDR?
The gain bandwidth product of the OPA145IDR is 5.5 MHz.
- What is the slew rate of the OPA145IDR?
The slew rate of the OPA145IDR is 20 V/μs.
- What is the typical quiescent current of the OPA145IDR?
The typical quiescent current of the OPA145IDR is 445 to 475 μA.
- What is the input bias current of the OPA145IDR?
The input bias current of the OPA145IDR is ±2 to ±10 pA.
- What is the common-mode voltage range of the OPA145IDR?
The common-mode voltage range of the OPA145IDR is from (V–) – 0.1 to (V+) – 3.5 V.
- What are the typical operating temperatures for the OPA145IDR?
The OPA145IDR operates over a temperature range of –40°C to 125°C.
- What is the output short-circuit current of the OPA145IDR?
The output short-circuit current of the OPA145IDR is ±20 mA.
- What types of applications is the OPA145IDR suitable for?
The OPA145IDR is suitable for applications such as amplifying small signals from high-impedance sensors, interfacing with single-supply precision ADCs and DACs, and transimpedance amplifiers.
- What are the key features of the OPA145IDR that make it stand out?
The OPA145IDR stands out due to its high gain bandwidth product, low slew rate, low supply current, pico-ampere input bias current, and rail-to-rail output swing.
- How does the OPA145IDR handle noise and interference?
The OPA145IDR has high CMRR and PSRR, which help in minimizing interference from power supply noise and common-mode signals.
