Overview
The INA121UA is a FET-input, low power instrumentation amplifier produced by Texas Instruments. It is renowned for its excellent accuracy and versatile three-op amp design, making it ideal for a variety of general purpose applications. The amplifier's small size and low power consumption allow it to be used in battery-operated and single 5V systems, enhancing its utility in diverse electronic designs.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 8-pin SOIC (D), 8-pin DIP |
| Operating Temperature Range | -40°C to +85°C |
| Supply Voltage Range | ±2.25V to ±18V (4.5V to 36V) |
| Quiescent Current | ±450µA |
| Input Offset Voltage | ±200µV |
| Input Offset Drift | ±2µV/°C |
| Input Noise | 20nV/sqrt(Hz) at f = 1kHz (G = 100) |
| Common Mode Rejection Ratio (CMRR) | 106dB at G = 100 |
| Nonlinearity Error | 0.001% max |
| Input Protection | Up to ±40V |
Key Features
- Low Bias Current: ±4pA, allowing use with high impedance sources.
- Low Quiescent Current: ±450µA, suitable for battery-operated systems.
- Low Input Offset Voltage: ±200µV, and low offset drift of ±2µV/°C.
- Low Input Noise: 20nV/sqrt(Hz) at f = 1kHz (G = 100).
- High Common Mode Rejection Ratio (CMRR): 106dB at G = 100.
- Wide Supply Range: ±2.25V to ±18V, enabling use in various power supply configurations.
- Low Nonlinearity Error: 0.001% max.
- Input Protection: Up to ±40V without damage.
- Gain Adjustable: From 1V to 10,000V/V with a single external resistor.
- Package Options: 8-pin plastic DIP and SO-8 surface mount.
Applications
The INA121UA is suitable for a wide range of general purpose applications, including but not limited to:
- Medical devices requiring high accuracy and low noise.
- Industrial control systems where precision and reliability are crucial.
- Automotive systems that need robust and low-power amplification.
- Test and measurement equipment where high CMRR and low offset voltage are essential.
- Battery-operated devices that require low power consumption.
Q & A
- What is the input bias current of the INA121UA?
The input bias current of the INA121UA is ±4pA. - What is the quiescent current of the INA121UA?
The quiescent current of the INA121UA is ±450µA. - What is the input offset voltage of the INA121UA?
The input offset voltage of the INA121UA is ±200µV. - What is the common mode rejection ratio (CMRR) of the INA121UA?
The CMRR of the INA121UA is 106dB at G = 100. - What is the supply voltage range for the INA121UA?
The supply voltage range for the INA121UA is ±2.25V to ±18V (4.5V to 36V). - How can the gain be adjusted in the INA121UA?
The gain can be adjusted from 1V to 10,000V/V with a single external resistor. - What are the package options for the INA121UA?
The package options include 8-pin plastic DIP and SO-8 surface mount. - What is the operating temperature range for the INA121UA?
The operating temperature range for the INA121UA is -40°C to +85°C. - Does the INA121UA have input protection?
Yes, the INA121UA has internal input protection that can withstand up to ±40V without damage. - What are some typical applications for the INA121UA?
The INA121UA is used in medical devices, industrial control systems, automotive systems, test and measurement equipment, and battery-operated devices.
