Overview
The INA118U is a precision, low-power instrumentation amplifier produced by Texas Instruments. It is designed for excellent accuracy and versatility, making it suitable for a wide range of applications. The device features a three op-amp design and is available in small packages, including 8-pin plastic DIP and SO-8 surface-mount packages. It operates over a temperature range of –40°C to +85°C and is ideal for battery-operated systems due to its low quiescent current of 350 µA and wide supply range of ±2.25 V to ±18 V.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Input Offset Voltage (RTI) | ±10 | ±50 | ±500 | µV |
| Input Offset Voltage Drift | ±0.2 | ±2 | ±20 | µV/°C |
| Input Bias Current | ±1 | ±5 | ±10 | nA |
| Common-Mode Rejection Ratio (CMRR) | 80 | 90 | 125 | dB |
| Quiescent Current | 350 | µA | ||
| Supply Voltage Range | ±2.25 | ±18 | V | |
| Safe Input Voltage | ±40 | V | ||
| Operating Temperature Range | –40 | +85 | °C |
Key Features
- Low offset voltage: 50 µV maximum
- Low drift: 0.5 µV/°C maximum
- Low input bias current: 5 nA maximum
- High common-mode rejection ratio (CMRR): up to 110 dB at G = 1000
- Inputs protected up to ±40 V
- Wide supply range: ±2.25 V to ±18 V
- Low quiescent current: 350 µA
- Available in 8-pin plastic DIP and SO-8 surface-mount packages
- Single external resistor sets any gain from 1 to 10000
Applications
The INA118U is suitable for a variety of applications due to its precision, low power consumption, and versatility. Some common applications include:
- Battery-operated systems: Due to its low quiescent current, it is ideal for battery-powered devices
- Medical devices: For precise signal amplification in medical equipment
- Industrial automation: For accurate signal conditioning in industrial control systems
- Test and measurement equipment: For precise amplification of small signals
- Aerospace and defense: For reliable and accurate signal processing in harsh environments
Q & A
- What is the maximum input offset voltage of the INA118U?
The maximum input offset voltage of the INA118U is 50 µV
- What is the input bias current of the INA118U?
The input bias current of the INA118U is 5 nA maximum
- What is the common-mode rejection ratio (CMRR) of the INA118U?
The CMRR of the INA118U can be up to 110 dB at G = 1000
- What is the safe input voltage range for the INA118U?
The safe input voltage range for the INA118U is up to ±40 V
- What is the operating temperature range of the INA118U?
The operating temperature range of the INA118U is –40°C to +85°C
- What are the available packages for the INA118U?
The INA118U is available in 8-pin plastic DIP and SO-8 surface-mount packages
- How is the gain set for the INA118U?
The gain for the INA118U can be set using a single external resistor, allowing gains from 1 to 10000
- What is the quiescent current of the INA118U?
The quiescent current of the INA118U is 350 µA
- Is the INA118U suitable for battery-operated systems?
Yes, the INA118U is suitable for battery-operated systems due to its low quiescent current
- Are there any newer versions of the INA118U available?
Yes, a newer version of this device is the INA818, which offers improved specifications such as lower input stage offset voltage and noise
