Overview
The INA333AIDGKTG4, produced by Texas Instruments, is a low-power, precision instrumentation amplifier designed for high accuracy and versatility. This device is built on the precision zero-drift OPA333 operational amplifier core and integrates laser-trimmed resistors to ensure excellent common-mode rejection. The INA333 is ideal for a wide range of portable applications due to its small size, low power consumption, and high precision. It operates with power supplies as low as 1.8 V and has a quiescent current of only 50 µA, making it suitable for battery-operated systems. The device is available in both 8-pin VSSOP and WSON surface-mount packages and is specified over the temperature range of –40°C to +125°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Low Offset Voltage | 25 µV (Maximum), G ≥ 100 | µV |
| Low Drift | 0.1 µV/°C, G ≥ 100 | µV/°C |
| Low Noise | 50 nV/√Hz, G ≥ 100 | nV/√Hz |
| High CMRR | 100 dB (Minimum), G ≥ 10 | dB |
| Low Input Bias Current | 200 pA (Maximum) | pA |
| Supply Range | 1.8 V to 5.5 V | V |
| Input Voltage | (V–) +0.1 V to (V+) –0.1 V | V |
| Output Range | (V–) +0.05 V to (V+) –0.05 V | V |
| Low Quiescent Current | 50 µA | µA |
| Operating Temperature | –40°C to +125°C | °C |
| Package Options | 8-Pin VSSOP, 8-Pin WSON |
Key Features
- Low Power Consumption: The INA333 operates with a quiescent current of only 50 µA, making it ideal for battery-operated systems.
- High Precision: Offers very low offset voltage (25 µV, G ≥ 100) and excellent offset voltage drift (0.1 µV/°C, G ≥ 100).
- High CMRR: Provides high common-mode rejection of 100 dB at G ≥ 10.
- Low Noise: Exceptionally low noise density of 50 nV/√Hz that extends down to DC.
- RFI Filtered Inputs: Includes RFI filtered inputs for improved signal integrity.
- Adjustable Gain: A single external resistor sets any gain from 1 to 1000 using an industry-standard gain equation.
- Compact Packaging: Available in both 8-pin VSSOP and WSON surface-mount packages.
Applications
- Bridge Amplifiers: Suitable for amplifying differential signals from bridge configurations.
- ECG Amplifiers: Used in electrocardiogram applications requiring high precision and low noise.
- Pressure Sensors: Ideal for amplifying signals from pressure sensors in various industrial and medical applications.
- Medical Instrumentation: Used in medical devices that require high accuracy and low power consumption.
- Portable Instrumentation: Perfect for portable measurement instruments due to its low power and compact size.
- Weigh Scales: Used in weight measurement systems that require precise signal amplification.
- Thermocouple Amplifiers: Suitable for amplifying signals from thermocouples in temperature measurement applications.
- RTD Sensor Amplifiers: Used for amplifying signals from Resistance Temperature Detectors (RTDs).
- Data Acquisition: Used in data acquisition systems that require high precision and low noise amplification.
Q & A
- What is the minimum power supply voltage for the INA333?
The minimum power supply voltage for the INA333 is 1.8 V.
- What is the maximum gain that can be set using the INA333?
The INA333 allows gain settings from 1 to 1000 using a single external resistor.
- What is the typical quiescent current of the INA333?
The typical quiescent current of the INA333 is 50 µA.
- What are the package options available for the INA333?
The INA333 is available in both 8-pin VSSOP and 8-pin WSON surface-mount packages.
- What is the operating temperature range of the INA333?
The INA333 operates over a temperature range of –40°C to +125°C.
- What is the common-mode rejection ratio (CMRR) of the INA333?
The INA333 has a CMRR of 100 dB at G ≥ 10.
- How does the INA333 handle noise?
The INA333 offers exceptionally low noise density of 50 nV/√Hz that extends down to DC.
- What are some typical applications of the INA333?
The INA333 is used in bridge amplifiers, ECG amplifiers, pressure sensors, medical instrumentation, portable instrumentation, weigh scales, thermocouple amplifiers, RTD sensor amplifiers, and data acquisition systems.
- Does the INA333 have RFI filtered inputs?
Yes, the INA333 includes RFI filtered inputs for improved signal integrity.
- How is the gain of the INA333 set?
The gain of the INA333 is set using a single external resistor with an industry-standard gain equation: G = 1 + (100 kΩ / RG).
