Overview
The INA121UAE4, produced by Texas Instruments, is a FET-input, low power instrumentation amplifier designed to offer excellent accuracy and versatility. This amplifier is ideal for a variety of general-purpose applications due to its small size and three-op amp design. It operates on power supplies as low as ±2.25V (+4.5V), making it suitable for battery-operated and single 5V systems. The INA121UAE4 features low quiescent current of ±450µA, low input offset voltage, and high common-mode rejection, making it a reliable choice for precision instrumentation.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Input Offset Voltage, RTI | ±200 | ±200 | ±500 | µV |
| Input Offset Drift | ±2 | ±2 | ±5 | µV/°C |
| Input Noise | 20 | nV/√Hz at f = 1kHz (G = 100) | ||
| Common-Mode Rejection | 106 | dB at G = 100 | ||
| Supply Voltage Range | ±2.25 | ±18 | V | |
| Quiescent Current | ±450 | ±525 | µA | |
| Operating Temperature Range | –40 | +85 | °C | |
| Input Bias Current | ±4 | pA | ||
| Input Protection | ±40 | V |
Key Features
- Low Quiescent Current: ±450µA, making it suitable for battery-operated systems.
- Low Input Offset Voltage: ±200µV, ensuring high accuracy.
- Low Input Offset Drift: ±2µV/°C, providing stable performance over temperature changes.
- Low Input Noise: 20nV/√Hz at f = 1kHz (G = 100), ideal for precise signal amplification.
- High Common-Mode Rejection: 106dB at G = 100, reducing common-mode noise effectively.
- Wide Supply Range: Operates from ±2.25V to ±18V, accommodating various power supply configurations.
- Low Nonlinearity Error: 0.001% max, ensuring high linearity in signal amplification.
- Input Protection: Can withstand up to ±40V without damage.
- Flexible Gain Setting: Gain can be set from 1V to 10,000V/V with a single external resistor.
- Compact Packaging: Available in 8-pin plastic DIP and SO-8 surface mount packages.
Applications
- Medical Equipment: Suitable for ECG, EEG, and other medical signal amplification due to its high accuracy and low noise.
- Industrial Automation: Used in sensor signal conditioning and data acquisition systems.
- Aerospace and Defense: Ideal for applications requiring high precision and reliability.
- Test and Measurement: Employed in various test equipment and measurement instruments.
- Automotive Systems: Used in automotive sensor systems and control units.
Q & A
- What is the minimum supply voltage for the INA121UAE4?
The minimum supply voltage is ±2.25V (+4.5V).
- What is the quiescent current of the INA121UAE4?
The quiescent current is ±450µA.
- What is the input offset voltage of the INA121UAE4?
The input offset voltage is ±200µV.
- How is the gain set for the INA121UAE4?
The gain can be set from 1V to 10,000V/V with a single external resistor connected between pins 1 and 8.
- What is the common-mode rejection ratio (CMRR) of the INA121UAE4?
The CMRR is 106dB at G = 100.
- What is the input bias current of the INA121UAE4?
The input bias current is ±4pA.
- What is the operating temperature range for the INA121UAE4?
The operating temperature range is –40°C to +85°C.
- What kind of input protection does the INA121UAE4 have?
The INA121UAE4 can withstand up to ±40V without damage.
- In what packages is the INA121UAE4 available?
The INA121UAE4 is available in 8-pin plastic DIP and SO-8 surface mount packages.
- How does the INA121UAE4 handle high impedance sources?
The INA121UAE4’s FET input circuitry provides low input bias current and high speed, making it suitable for use with high impedance sources.
