Overview
The INA114APG4, produced by Texas Instruments, is a low-cost, general-purpose instrumentation amplifier known for its excellent accuracy and versatility. This device features a three-op-amp design and is available in 8-pin plastic DIP and 16-pin SOIC packages. It operates over a wide supply range of ±2.25V to ±18V, making it suitable for various applications, including battery-operated and single 5V supply systems. The INA114 is laser trimmed for very low offset voltage, drift, and high common-mode rejection, ensuring high precision in measurement and signal amplification tasks.
Key Specifications
| Parameter | Min | Max | Units | |
|---|---|---|---|---|
| Input Offset Voltage (Vos) | - | - | 50 µV (max for high gains) | µV |
| Input Offset Voltage Drift | - | - | 0.3 µV/°C (max for high gains) | µV/°C |
| Input Bias Current | - | - | 2 nA (max) | nA |
| Common-Mode Rejection Ratio (CMRR) | 115 dB (min at G = 1000) | - | - | dB |
| Input Over-Voltage Protection | - | - | ±40 V | V |
| Supply Voltage Range | ±2.25 V | - | ±18 V | V |
| Bandwidth (–3dB) | - | - | 1 MHz (G = 1), 100 kHz (G = 10), 10 kHz (G = 100), 1 kHz (G = 1000) | Hz |
| Slew Rate | - | 0.3 V/µs (G = 10) | 0.6 V/µs (G = 10) | V/µs |
| Settling Time (0.01%) | - | - | 18 µs (G = 1), 20 µs (G = 10), 120 µs (G = 100), 1100 µs (G = 1000) | µs |
Key Features
- Low Offset Voltage: Maximum of 50 µV for high gains.
- Low Drift: Maximum of 0.3 µV/°C for high gains.
- Low Input Bias Current: Maximum of 2 nA.
- High Common-Mode Rejection: Minimum of 115 dB at G = 1000.
- Input Over-Voltage Protection: Up to ±40 V without damage.
- Wide Supply Range: Operates with supplies from ±2.25 V to ±18 V.
- Adjustable Gain: Gain can be set from 1 to 10,000 using a single external resistor.
- Low Quiescent Current: Maximum of 3 mA.
- High Input Impedance: Approximately 10^10 Ω.
Applications
- Surgical Equipment: For precise signal amplification in medical devices.
- Actuator Control: In industrial automation and control systems.
- Multifunction Relay: For various signal processing tasks in relays.
- Train Control and Management: In rail transportation systems.
- Trackside Signaling and Control: For reliable signal processing in rail infrastructure.
- Bridge Amplifier: For strain gauge and bridge sensor applications.
- Thermocouple Amplifier: For temperature measurement.
- RTD Sensor Amplifier: For resistance temperature detector applications.
- Medical Instrumentation: For various medical diagnostic and monitoring devices.
- Data Acquisition: In data acquisition systems requiring high precision amplification.
Q & A
- What is the maximum input offset voltage of the INA114APG4?
The maximum input offset voltage is 50 µV for high gains.
- How does the gain of the INA114APG4 get set?
The gain is set by connecting a single external resistor, RG, according to the equation G = 1 + 50 kΩ / RG.
- What is the common-mode rejection ratio (CMRR) of the INA114APG4?
The CMRR is a minimum of 115 dB at a gain of 1000.
- What is the input over-voltage protection of the INA114APG4?
The INA114APG4 has input over-voltage protection up to ±40 V without damage.
- What is the operating temperature range of the INA114APG4?
The operating temperature range is from –40°C to +85°C.
- What are the typical applications of the INA114APG4?
Typical applications include surgical equipment, actuator control, multifunction relays, train control and management, trackside signaling, bridge amplifiers, thermocouple amplifiers, RTD sensor amplifiers, medical instrumentation, and data acquisition.
- What is the maximum quiescent current of the INA114APG4?
The maximum quiescent current is 3 mA.
- How does the INA114APG4 protect against input bias current?
The device requires a path for the input bias current, which is typically less than ±1 nA, to ensure proper operation.
- What is the bandwidth of the INA114APG4 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.
- How does the output sense feedback connection work in the SOIC package?
In the SOIC package, the output sense feedback connection (pin 12) must be connected to the output terminal (pin 11) for proper operation.
