High-Precision Instrumentation Amplifier for Low-Power Applications
"(《世界人权宣言》) INA333 is a high-performance, low-power instrumentation amplifier designed by 德州仪器（TI） to deliver precision signal amplification in compact, power-sensitive systems. Engineered with a focus on low offset voltage, low noise, and high common-mode rejection, this device is ideal for applications requiring accurate, low-level signal measurement. With its rail-to-rail output and wide supply range, it offers exceptional versatility across a broad spectrum of industrial and medical applications.
Technical Overview of the INA333 Instrumentation Amplifier
This instrumentation amplifier is built using a three-op-amp architecture and features a single external resistor to set the gain, allowing for flexible design integration. The device operates on a single or dual supply and is optimized for low power consumption without compromising performance. Its small footprint and high precision make it a preferred choice for designers working on space-constrained and battery-operated systems.
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主要功能
- Low offset voltage: 25 µV (max)
- Low offset drift: 0.1 µV/°C (typ)
- Low input bias current: 200 pA (max)
- Low noise: 50 nV/√Hz at 1 kHz
- High CMRR: 100 dB (min) at G ≥ 10
- Rail-to-rail output
- Wide supply range: 1.8 V to 5.5 V
- Gain set with a single external resistor: 1 to 10,000
- Low quiescent current: 50 µA (typ)
- Small package: SC70-8 and MSOP-8
技术规格
| 参数 | 价值 |
|---|---|
| 输入偏置电压（最大值） | 25 µV |
| Input Offset Drift (Typ) | 0.1 µV/°C |
| Input Bias Current (Max) | 200 pA |
| Noise Density at 1 kHz | 50 nV/√Hz |
| Common-Mode Rejection Ratio (CMRR) | 100 dB (min) at G ≥ 10 |
| Gain Range | 1 to 10,000 (set by external resistor) |
| 电源电压范围 | 1.8 V 至 5.5 V |
| 静态电流 | 50 µA (typ) |
| 输出类型 | Rail-to-Rail |
| 套餐选项 | SC70-8, MSOP-8 |
Why Choose This Instrumentation Amplifier Over Conventional Alternatives?
Compared to typical instrumentation amplifiers, this device offers a unique combination of 超低功耗, 高精度和 compact packaging. Many standard amplifiers in the market either consume more power or require larger board space, making them less suitable for portable or battery-powered applications. The INA333 stands out with its 50 µA typical quiescent current, enabling longer battery life in wearable and remote sensing devices.
Its low offset voltage and drift ensure accurate signal amplification over time and temperature, which is critical in medical instrumentation and industrial monitoring systems. The high CMRR minimizes the impact of common-mode noise, improving signal integrity in electrically noisy environments. Additionally, the ability to set gain with a single resistor simplifies design and reduces BOM complexity.
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According to industry experts and design engineers, the INA333 is a go-to solution for applications where precision and power efficiency are paramount. Its performance has been validated in numerous real-world designs, earning it a reputation for reliability and accuracy.
Typical Applications of the INA333
- Medical Instrumentation: ECG, EEG, and blood pressure monitors
- Industrial Process Control: Sensor signal conditioning, strain gauges
- Portable Devices: Battery-powered measurement systems
- Weigh Scales: Load cell signal amplification
- 数据采集系统: High-precision analog front ends
About Texas Instruments (TI)
德州仪器 is a globally recognized leader in analog and embedded processing semiconductor solutions. With decades of innovation and a commitment to quality, TI provides reliable components that power everything from industrial automation to medical electronics. The company’s focus on precision analog technology is evident in products like the INA333, which exemplify TI’s dedication to performance, efficiency, and design flexibility.
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常见问题（FAQ）
1. What makes this instrumentation amplifier suitable for medical applications?
The device offers low offset voltage, low noise, and high CMRR, which are essential for accurately amplifying small bio-signals in medical devices like ECG and EEG monitors. Its low power consumption also supports battery-operated medical equipment.
2. Can this amplifier operate with a single supply voltage?
Yes, it supports a wide supply range from 1.8 V to 5.5 V, making it compatible with both single and dual supply systems. This flexibility simplifies integration into various circuit designs.
3. How is the gain of the amplifier configured?
The gain is set using a single external resistor, allowing designers to easily adjust the amplification factor from 1 to 10,000. This simplifies circuit design and reduces component count.
4. What package options are available for space-constrained designs?
The amplifier is available in