Overview
The INA114AU/1K is a precision instrumentation amplifier produced by Texas Instruments. It is designed for general-purpose instrumentation applications, offering high accuracy and versatility. The device features a three-op-amp design and is known for its low offset voltage, low drift, and high common-mode rejection ratio. The INA114AU/1K is laser trimmed for very low offset voltage and drift, making it an excellent choice for a wide range of applications. It can be configured for gains from 1 to 10,000 using a single external resistor, and it includes internal input protection that withstands up to ±40V without damage.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Offset Voltage | - | - | 50 µV | - |
| Offset Voltage Drift | - | - | 0.3 µV/°C | - |
| Input Bias Current | - | - | 2 nA | - |
| Common-Mode Rejection Ratio (CMRR) | 115 dB | - | - | - |
| Input Over-Voltage Protection | - | - | ±40 V | - |
| Supply Voltage Range | ±2.25 V | - | ±18 V | - |
| Gain Range | 1 | - | 10,000 | - |
| Bandwidth (–3dB) | - | - | 1 MHz (G=1), 100 kHz (G=10), 10 kHz (G=100), 1 kHz (G=1000) | - |
| Slew Rate | 0.3 V/µs | 0.6 V/µs | - | - |
| Settling Time (0.01%) | 18 µs (G=1), 20 µs (G=10), 120 µs (G=100), 1100 µs (G=1000) | - | - | - |
Key Features
- Low offset voltage: 50 µV maximum for high gains.
- Low drift: 0.3 µV/°C maximum for high gains.
- Low input bias current: 2 nA maximum.
- High common-mode rejection ratio: 115 dB minimum at G = 1000.
- Input over-voltage protection: ±40 V.
- Wide supply range: ±2.25 V to ±18 V.
- Configurable gain from 1 to 10,000 using a single external resistor.
- High input impedance: approximately 10^10 Ω.
- Low noise performance: approximately 0.4 µVPP from 0.1 Hz to 10 Hz.
Applications
- Surgical equipment.
- Actuators.
- Multifunction relays.
- Train control and management systems.
- Trackside signaling and control systems.
Q & A
- What is the maximum offset voltage of the INA114AU/1K?
The maximum offset voltage is 50 µV for high gains.
- How is the gain of the INA114AU/1K set?
The gain is set by connecting a single external resistor, RG, using the equation G = 1 + (50 kΩ / RG).
- What is the common-mode rejection ratio (CMRR) of the INA114AU/1K?
The CMRR is 115 dB minimum at G = 1000.
- What is the input over-voltage protection of the INA114AU/1K?
The input over-voltage protection is ±40 V.
- What is the supply voltage range of the INA114AU/1K?
The supply voltage range is ±2.25 V to ±18 V.
- What are the typical applications of the INA114AU/1K?
Typical applications include surgical equipment, actuators, multifunction relays, train control and management systems, and trackside signaling and control systems.
- What is the bandwidth of the INA114AU/1K at different gains?
The bandwidth is 1 MHz at G=1, 100 kHz at G=10, 10 kHz at G=100, and 1 kHz at G=1000.
- What is the slew rate of the INA114AU/1K?
The slew rate is 0.3 V/µs to 0.6 V/µs.
- How does the INA114AU/1K handle input bias current?
The INA114AU/1K has a high input impedance and requires a path for the input bias current, which is typically less than ±1 nA.
- What is the noise performance of the INA114AU/1K?
The noise performance is approximately 0.4 µVPP from 0.1 Hz to 10 Hz.
