Overview
The INA333, produced by Texas Instruments, is a low-power, precision instrumentation amplifier designed to offer excellent accuracy and versatility. This device is based on the zero-drift OPA333 operational amplifier core and integrates laser-trimmed resistors to ensure high common-mode rejection and low gain error. The INA333 is ideal for a wide range of portable applications due to its small size, low power consumption, and ability to operate with power supplies as low as 1.8 V.
Key Specifications
| Parameter | Value |
|---|---|
| Supply Range | 1.8 V to 5.5 V |
| Input Voltage | (V–) +0.1 V to (V+) –0.1 V |
| Output Range | (V–) +0.05 V to (V+) –0.05 V |
| Quiescent Current | 50 µA |
| Operating Temperature | –40°C to +125°C |
| Input Bias Current | 200 pA (Maximum) |
| Offset Voltage | 25 µV (Maximum), G ≥ 100 |
| Offset Voltage Drift | 0.1 µV/°C, G ≥ 100 |
| Noise Density | 50 nV/√Hz, G ≥ 100 |
| Common-Mode Rejection Ratio (CMRR) | 100 dB (Minimum), G ≥ 10 |
| Package Types | 8-Pin VSSOP and 8-Pin WSON |
Key Features
- Low-power consumption with a quiescent current of 50 µA.
- Zero-drift chopper circuitry for excellent DC specifications.
- High common-mode rejection ratio (CMRR) of 100 dB at G ≥ 10.
- Low offset voltage of 25 µV (Maximum) and low offset voltage drift of 0.1 µV/°C at G ≥ 100.
- Low noise density of 50 nV/√Hz at G ≥ 100.
- RFI filtered inputs for improved noise immunity.
- Gain adjustable from 1 to 1000 using a single external resistor.
- Small size with 8-pin VSSOP and WSON surface-mount packages.
Applications
- Bridge Amplifiers
- ECG Amplifiers
- Pressure Sensors
- Medical Instrumentation
- Portable Instrumentation
- Weigh Scales
- Thermocouple Amplifiers
- RTD Sensor Amplifiers
- Data Acquisition Systems
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 power supply voltage for the INA333?
The maximum power supply voltage for the INA333 is 5.5 V.
- 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 operating temperature range of the INA333 is –40°C to +125°C.
- How is the gain of the INA333 set?
The gain of the INA333 is set by a single external resistor, RG, using the 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 common-mode rejection ratio (CMRR) of the INA333?
The CMRR of the INA333 is 100 dB (Minimum) at G ≥ 10.
- What is the noise density of the INA333?
The noise density of the INA333 is 50 nV/√Hz at G ≥ 100.
- What are some typical applications of the INA333?
Typical applications include 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 has RFI filtered inputs for improved noise immunity.
