Overview
The INA333AIDGKR, produced by Texas Instruments, is a low-power, precision instrumentation amplifier designed to offer excellent accuracy and versatility. This device is built on a zero-drift operational amplifier core, specifically the OPA333, 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. It is particularly suited for battery-operated systems with a quiescent current of only 50 µA.
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) |
| Common-Mode Rejection Ratio (CMRR) | 100 dB (Minimum), G ≥ 10 |
| Offset Voltage | 25 µV (Maximum), G ≥ 100 |
| Offset Voltage Drift | 0.1 µV/°C, G ≥ 100 |
| Noise Density | 50 nV/√Hz, G ≥ 100 |
| Package Types | 8-Pin VSSOP and 8-Pin WSON |
Key Features
- Low offset voltage: 25 µV (Maximum), G ≥ 100
- Low drift: 0.1 µV/°C, G ≥ 100
- Low noise: 50 nV/√Hz, G ≥ 100
- High common-mode rejection ratio (CMRR): 100 dB (Minimum), G ≥ 10
- Low input bias current: 200 pA (Maximum)
- RFI filtered inputs
- Single external resistor sets gain from 1 to 1000 using the industry-standard gain equation: G = 1 + (100 kΩ / RG)
- Autocalibration techniques for excellent precision over the extended industrial temperature range
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 and maximum supply voltage for the INA333?
The minimum supply voltage is 1.8 V, and the maximum supply voltage is 5.5 V.
- What is the quiescent current of the INA333?
The quiescent current is 50 µA.
- How is the gain of the INA333 set?
The gain is set by a single external resistor, RG, using the industry-standard gain equation: G = 1 + (100 kΩ / RG).
- What are the package options for the INA333?
The INA333 is available in 8-pin VSSOP and 8-pin WSON surface-mount packages.
- What is the operating temperature range of the INA333?
The operating temperature range is –40°C to +125°C.
- What is the common-mode rejection ratio (CMRR) of the INA333?
The CMRR is 100 dB (Minimum) for gains ≥ 10.
- What is the offset voltage and drift of the INA333?
The offset voltage is 25 µV (Maximum) and the offset voltage drift is 0.1 µV/°C for gains ≥ 100.
- Does the INA333 have RFI filtered inputs?
Yes, the INA333 has RFI filtered inputs.
- What are some common applications of the INA333?
Common applications include bridge amplifiers, ECG amplifiers, pressure sensors, medical instrumentation, portable instrumentation, weigh scales, thermocouple amplifiers, RTD sensor amplifiers, and data acquisition systems.
- How does the INA333 ensure precision over the extended industrial temperature range?
The INA333 uses autocalibration techniques to ensure excellent precision over the extended industrial temperature range.
