Overview
The INA125UA/2K5 is a low-power, high-accuracy instrumentation amplifier produced by Texas Instruments. It integrates a precision voltage reference and provides complete bridge excitation and differential-input amplification on a single integrated circuit. The device is designed for low quiescent current, low offset voltage, and high common-mode rejection, making it suitable for a variety of precision measurement applications.
The INA125UA/2K5 operates on single or dual supplies, with a wide supply range from 2.7V to 36V for single supply and ±1.35V to ±18V for dual supply. It features a sleep mode for power saving and is available in 16-pin plastic DIP and SO-16 surface-mount packages.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Offset Voltage, RTI | Initial | ±50 | ±250 | ±500 | µV |
| Offset Voltage Drift | vs Temperature | ±0.25 | ±2 | ±5 | µV/°C |
| Input Bias Current | Max | - | 20 | - | nA |
| Common-Mode Rejection | G = 100 | 100 | 114 | 90 | dB |
| Bandwidth, –3dB | G = 100 | 4.5 | - | - | kHz |
| Slew Rate | G = 4, 10V Step | 0.2 | - | - | V/µs |
| Quiescent Current | Positive | 460 | 525 | - | µA |
| Operating Temperature Range | - | -40 | - | +85 | °C |
Key Features
- Low quiescent current: 460µA
- Precision voltage reference: 1.24V, 2.5V, 5V, or 10V
- Sleep mode for power saving
- Low offset voltage: 250µV max
- Low offset drift: 2µV/°C max
- Low input bias current: 20nA max
- High common-mode rejection: 100dB min
- Low noise: 38nV/√Hz at f = 1kHz
- Input protection to ±40V
- Wide supply range: Single supply 2.7V to 36V, dual supply ±1.35V to ±18V
- Available in 16-pin DIP and SO-16 SOIC packages
Applications
- Pressure and temperature bridge amplifiers
- Industrial process control
- Factory automation
- Multi-channel data acquisition
- Battery-operated systems
- General-purpose instrumentation
Q & A
- What is the typical quiescent current of the INA125UA/2K5?
The typical quiescent current is 460µA for the positive supply and -280µA for the negative supply.
- What are the available precision voltage reference values for the INA125UA/2K5?
The precision voltage reference values are 1.24V, 2.5V, 5V, or 10V.
- What is the common-mode rejection ratio (CMRR) of the INA125UA/2K5?
The CMRR is 100dB minimum at a gain of 100.
- What is the input bias current of the INA125UA/2K5?
The input bias current is 20nA maximum.
- What are the operating temperature ranges for the INA125UA/2K5?
The specified operating temperature range is -40°C to +85°C, and the storage range is -55°C to +125°C.
- Can the INA125UA/2K5 be used in battery-operated systems?
- What types of packages are available for the INA125UA/2K5?
The INA125UA/2K5 is available in 16-pin plastic DIP and SO-16 surface-mount packages.
- How does the sleep mode function in the INA125UA/2K5?
The sleep mode allows the device to be shut down to save power, with a sleep current of ±1µA to ±25µA when VSLEEP ≤ 100mV.
- What is the bandwidth of the INA125UA/2K5 at different gains?
The bandwidth is 150kHz at G = 4, 45kHz at G = 10, 4.5kHz at G = 100, and 0.9kHz at G = 500.
- Is the INA125UA/2K5 suitable for industrial process control applications?
