Overview
The INA125UA is a low-power, high-accuracy instrumentation amplifier produced by Texas Instruments. It is designed to provide complete bridge excitation and precision differential-input amplification on a single integrated circuit. The device is laser-trimmed for low offset voltage, low offset drift, and high common-mode rejection, making it suitable for a variety of precision measurement applications. The INA125UA operates on single or dual supplies and features a precision voltage reference that is externally adjustable, allowing for use with various transducers.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Input Offset Voltage, RTI | Initial | ±50 | ±250 | ±500 | µV |
| Input Offset Voltage Drift | vs Temperature | ±0.25 | ±2 | ±5 | µV/°C |
| Input Bias Current | 10 | 20 | 50 | nA | |
| Common-Mode Rejection | G = 100 | 100 | 114 | 90 | dB |
| Bandwidth, –3dB | G = 4 | 150 | kHz | ||
| Slew Rate | G = 4, 10V Step | 0.2 | V/µs | ||
| Supply Voltage Range | Single Supply | 2.7 | 36 | V | |
| Supply Voltage Range | Dual Supply | ±1.35 | ±18 | V | |
| Quiescent Current | IO = IREF = 0mA | 460 | 525 | µA | |
| Sleep Current | VSLEEP ≤ 100mV | ±1 | ±25 | µA | |
| Operating Temperature Range | –40 | +85 | °C |
Key Features
- Low Quiescent Current: 460µA typical.
- Precision Voltage Reference: 1.24V, 2.5V, 5V, or 10V, with ±0.5% accuracy and ±35ppm/°C drift.
- Sleep Mode: Allows shutdown and duty cycle operation to save power.
- Low Offset Voltage and Drift: 250µV max and 2µV/°C max.
- High Common-Mode Rejection: 100dB min at G = 100.
- Low Noise: 38nV/√Hz at f = 1kHz.
- Input Protection: To ±40V.
- Wide Supply Range: Single supply from 2.7V to 36V and dual supply from ±1.35V to ±18V.
- Adjustable Gain: A single external resistor sets any gain from 4 to 10,000.
- Package Options: 16-pin plastic DIP and SO-16 surface-mount packages.
Applications
- Pressure and Temperature Bridge Amplifiers: Suitable for precision measurement in bridge configurations.
- Industrial Process Control: Used in various industrial control systems requiring high accuracy.
- Factory Automation: Ideal for automation systems that need reliable and precise signal amplification.
- Multi-Channel Data Acquisition: Applicable in data acquisition systems where multiple channels need to be amplified.
- Battery Operated Systems: Suitable due to its low power consumption and sleep mode feature.
- General Purpose Instrumentation: Can be used in a wide range of instrumentation applications requiring high accuracy and low noise.
Q & A
- What is the typical quiescent current of the INA125UA?
The typical quiescent current is 460µA.
- What are the available precision voltage reference values for the INA125UA?
The available precision voltage reference values are 1.24V, 2.5V, 5V, and 10V.
- What is the common-mode rejection ratio (CMRR) of the INA125UA at a gain of 100?
The CMRR at a gain of 100 is 100dB min.
- What is the operating temperature range of the INA125UA?
The operating temperature range is –40°C to +85°C.
- Can the INA125UA be used in battery-operated systems?
Yes, it is suitable for battery-operated systems due to its low power consumption and sleep mode feature.
- What are the package options available for the INA125UA?
The INA125UA is available in 16-pin plastic DIP and SO-16 surface-mount packages.
- How is the gain of the INA125UA adjusted?
The gain is adjusted using a single external resistor, allowing gains from 4 to 10,000.
- What is the input bias current of the INA125UA?
The input bias current is approximately 20nA max.
- Does the INA125UA have input protection?
Yes, it has input protection to ±40V.
- Is the INA125UA recommended for new designs?
No, the INA125UA is not recommended for new designs as it has been announced for discontinuation and is in the lifetime-buy period.
