Overview
The INA141UA/2K5G4, produced by Texas Instruments, is a precision, low-power instrumentation amplifier designed for a wide range of applications requiring high accuracy and low noise. This device features a versatile three-op-amp design and is available in an 8-pin SOIC package. It operates over a temperature range of –40°C to +85°C and is known for its excellent accuracy, low offset voltage, and high common-mode rejection ratio (CMRR).
The INA141 is laser trimmed for very low offset voltage (50 µV maximum at G = 100 V/V) and drift (0.5 µV/°C maximum at G = 100 V/V), making it an excellent choice for applications such as temperature transmitters, medical instrumentation, data acquisition, and process analytics.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Supply Voltage (Dual Supply) | ±2.25 | ±18 | V | |
| Input Voltage | ±40 | V | ||
| Operating Temperature | –40 | 125 | °C | |
| Offset Voltage (G = 100 V/V) | 20 | 50 | µV | |
| Offset Voltage Drift (G = 100 V/V) | 0.2 | 0.5 | µV/°C | |
| Input Bias Current | 2 | 5 | nA | |
| Common-Mode Rejection Ratio (G = 100 V/V) | 117 | 125 | dB | |
| Bandwidth (G = 100 V/V) | 200 kHz | |||
| Quiescent Current | 750 | 800 | µA |
Key Features
- Low offset voltage: 50 µV maximum at G = 100 V/V
- Low drift: 0.5 µV/°C maximum at G = 100 V/V
- Accurate gain: ±0.05% at G = 10 V/V
- Low input bias current: 5 nA maximum
- High CMRR: 117 dB minimum at G = 100 V/V
- Inputs protected to ±40 V
- Wide supply range: ±2.25 V to ±18 V
- Low quiescent current: 750 µA
- Wide bandwidth: 200 kHz at G = 100 V/V
- Small 8-pin SOIC package
Applications
- Temperature transmitters
- Medical instrumentation
- Data acquisition (DAQ)
- Process analytics (pH, gas, concentration, force, and humidity)
- ECG amplifiers
- Bridge amplifiers
Q & A
- What is the typical offset voltage of the INA141 at a gain of 100 V/V?
The typical offset voltage is 20 µV at a gain of 100 V/V.
- What is the maximum input voltage that the INA141 can handle?
The INA141 can handle input voltages up to ±40 V.
- What is the common-mode rejection ratio (CMRR) of the INA141 at a gain of 100 V/V?
The CMRR is 117 dB minimum at a gain of 100 V/V.
- What is the quiescent current of the INA141?
The quiescent current is 750 µA.
- What is the bandwidth of the INA141 at a gain of 100 V/V?
The bandwidth is 200 kHz at a gain of 100 V/V.
- What is the operating temperature range of the INA141?
The operating temperature range is –40°C to +85°C.
- How is the gain set for the INA141?
The gain can be set to 10 V/V or 100 V/V without external resistors, and other gains can be achieved with external resistors, though this is not recommended due to internal resistor variations.
- What kind of input protection does the INA141 have?
The inputs are individually protected for voltages up to ±40 V, and the protection circuitry limits the input current to a safe value if overloaded.
- What is the slew rate of the INA141 at a gain of 10 V/V?
The slew rate is 2 V/µs at a gain of 10 V/V.
- What is the typical noise performance of the INA141?
The INA141 provides very low noise, with approximately 0.2 µVPP measured from 0.1 Hz to 10 Hz at a gain of 100 V/V.
