Overview
The INA333, produced by Texas Instruments, is a low-power, zero-drift, precision instrumentation amplifier. This device is designed to offer excellent accuracy and is ideal for a wide range of portable applications due to its versatile three-operational-amplifier design, small size, and low power consumption. The INA333 is particularly suited for battery-operated systems, operating with power supplies as low as 1.8 V (±0.9 V) and a quiescent current of only 50 µA.
Key Specifications
| Specification | Value | Unit |
|---|---|---|
| Input Offset Voltage | 25 µV (G ≥ 100) | µV |
| Offset Voltage Drift | 0.1 µV/°C (G ≥ 100) | µV/°C |
| Common-Mode Rejection Ratio (CMRR) | 100 dB (G ≥ 10) | dB |
| Input Bias Current | 200 pA (Maximum) | pA |
| Noise Density | 50 nV/√Hz (G ≥ 100) | nV/√Hz |
| Supply Voltage Range | 1.8 V to 5.5 V | V |
| Quiescent Current | 50 µA | µA |
| Operating Temperature Range | –40°C to +125°C | °C |
| Package Types | 8-pin VSSOP, 8-pin WSON |
Key Features
- High Common-Mode Rejection Ratio: The INA333 has a CMRR of 100 dB at G ≥ 10, enabling it to effectively reject common-mode signals.
- Low Input Offset Voltage and Drift: The device features an input offset voltage of 25 µV and an offset voltage drift of 0.1 µV/°C, making it suitable for applications requiring high accuracy.
- Low Input Bias Current: With a maximum input bias current of 200 pA, it is suitable for use with high output impedance signal sources.
- Wide Supply Voltage Range: The INA333 can operate within a supply voltage range of 1.8 V to 5.5 V, making it suitable for battery-powered applications.
- Rail-to-Rail Output: The device can swing its output voltage from the negative supply rail to the positive supply rail, which is beneficial in applications where the output voltage needs to be near the supply voltage rails.
- Low Quiescent Current: The INA333 has a low quiescent current of 50 µA, which is ideal for battery-operated systems where power consumption is critical.
- Adjustable Gain: A single external resistor can set any gain from 1 to 1000 using the industry-standard gain equation: G = 1 + (100 kΩ / RG).
Applications
- Sensor Amplification: The INA333 is ideal for amplifying small signals from sensors due to its high accuracy and low noise characteristics.
- Medical Instruments: Its precision and low power consumption make it suitable for medical devices that require accurate signal amplification.
- Industrial Process Control: The device is used in industrial applications for precise signal amplification and common-mode rejection.
- Audio Amplification: The INA333 can be used in audio applications where high fidelity and low noise are required.
- Portable and Battery-Operated Systems: Its low power consumption and wide supply voltage range make it ideal for portable and battery-operated systems.
Q & A
- What is the input offset voltage of the INA333?
The input offset voltage of the INA333 is typically 25 µV for gains greater than or equal to 100.
- What is the common-mode rejection ratio (CMRR) of the INA333?
The CMRR of the INA333 is 100 dB for gains greater than or equal to 10.
- What is the quiescent current of the INA333?
The quiescent current of the INA333 is 50 µA.
- What is the operating temperature range of the INA333?
The INA333 operates over a temperature range of –40°C to +125°C.
- How is the gain of the INA333 adjusted?
The gain of the INA333 can be adjusted using a single external resistor with the gain equation: G = 1 + (100 kΩ / RG).
- What are the package types available for the INA333?
The INA333 is available in 8-pin VSSOP and 8-pin WSON surface-mount packages.
- What is the noise density of the INA333?
The noise density of the INA333 is 50 nV/√Hz for gains greater than or equal to 100.
- Is the INA333 suitable for battery-operated systems?
Yes, the INA333 is highly suitable for battery-operated systems due to its low power consumption and wide supply voltage range.
- What are some common applications of the INA333?
The INA333 is commonly used in sensor amplification, medical instruments, industrial process control, audio amplification, and other portable and battery-operated systems.
- Does the INA333 have rail-to-rail output capability?
Yes, the INA333 has rail-to-rail output capability, allowing the output voltage to swing from the negative supply rail to the positive supply rail.
