Overview
The INA118U/2K5G4 is a precision, low-power instrumentation amplifier produced by Texas Instruments. This device is designed for general-purpose instrumentation applications and offers excellent accuracy and versatility. The INA118 features a three op-amp design, which provides wide bandwidth even at high gain settings. It is particularly suited for applications requiring low offset voltage, low drift, and high common-mode rejection ratio (CMRR). The amplifier operates with a wide supply range of ±2.25 V to ±18 V and has a low quiescent current of 350 µA, making it an excellent choice for battery-operated systems.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Input Offset Voltage (RTI) | ±10 | ±50 | ±500 | µV |
| Input Bias Current | 5 | nA | ||
| Common-Mode Rejection Ratio (CMRR) | 110 | dB | ||
| Input Protection | ±40 | V | ||
| Supply Voltage Range | ±2.25 | ±18 | V | |
| Quiescent Current | 350 | µA | ||
| Bandwidth (G = 100) | 70 | kHz | ||
| Operating Temperature Range | –40 | +85 | °C | |
| Package Types | PDIP (8), SOIC (8) |
Key Features
- Low offset voltage: 50 µV maximum
- Low drift: 0.5 µV/°C maximum
- Low input bias current: 5 nA maximum
- High CMRR: 110 dB minimum at G = 1000
- Inputs protected to ±40 V
- Wide supply range: ±2.25 V to ±18 V
- Low quiescent current: 350 µA
- Single external resistor sets gain from 1 to 10,000
- Available in 8-pin plastic DIP and SO-8 surface-mount packages
Applications
- Pressure transmitters
- Temperature transmitters
- Weigh scales
- Electrocardiograms (ECG)
- Analog input modules
- Data acquisition (DAQ) systems
Q & A
- What is the maximum input offset voltage of the INA118U/2K5G4?
The maximum input offset voltage is 50 µV.
- What is the common-mode rejection ratio (CMRR) of the INA118U/2K5G4?
The CMRR is 110 dB minimum at G = 1000.
- What is the input bias current of the INA118U/2K5G4?
The input bias current is 5 nA maximum.
- What is the quiescent current of the INA118U/2K5G4?
The quiescent current is 350 µA.
- What is the operating temperature range of the INA118U/2K5G4?
The operating temperature range is –40°C to +85°C.
- What types of packages are available for the INA118U/2K5G4?
The device is available in 8-pin plastic DIP and SO-8 surface-mount packages.
- How is the gain of the INA118U/2K5G4 set?
The gain can be set using a single external resistor, allowing gains from 1 to 10,000.
- What are some common applications of the INA118U/2K5G4?
Common applications include pressure transmitters, temperature transmitters, weigh scales, ECG, analog input modules, and DAQ systems.
- What is the bandwidth of the INA118U/2K5G4 at a gain of 100?
The bandwidth at a gain of 100 is 70 kHz.
- Is the INA118U/2K5G4 suitable for battery-operated systems?
Yes, it is suitable due to its low quiescent current of 350 µA.
