Overview
The INA125PA, produced by Texas Instruments, is a low-power, high-accuracy instrumentation amplifier with a precision voltage reference. This device provides complete bridge excitation and precision differential-input amplification on a single integrated circuit. It is designed for applications requiring high precision and low power consumption, making it suitable for a variety of industrial and general-purpose instrumentation uses.
Key Specifications
| Parameter | Conditions | Min | Max | Units | |
|---|---|---|---|---|---|
| Offset Voltage, RTI | Initial | ±50 | ±250 | ±500 | µV |
| Offset Voltage Drift vs Temperature | ±0.25 | ±2 | ±5 | µV/°C | |
| Input Bias Current | 20 | nA | |||
| Common-Mode Rejection Ratio (CMRR) | G = 100 | 100 | 114 | 90 | dB |
| Bandwidth, –3dB | G = 100 | 4.5 | kHz | ||
| Slew Rate | G = 4, 10V Step | 0.2 | V/µs | ||
| Supply Voltage Range | Single Supply | 2.7 | 36 | V | |
| Dual Supply | ±1.35 | ±18 | V | ||
| Quiescent Current | 460 | 525 | µA | ||
| Sleep Current | VSLEEP ≤ 100mV | ±1 | ±25 | µA |
Key Features
- Low Quiescent Current: 460µA, making it suitable for battery-operated systems.
- Precision Voltage Reference: Externally adjustable with pin-selectable voltages of 2.5V, 5V, or 10V.
- Sleep Mode: Allows shutdown and duty cycle operation to save power.
- Low Offset Voltage: Maximum of 250µV and low offset drift of 2µV/°C.
- Low Input Bias Current: Maximum of 20nA.
- High Common-Mode Rejection Ratio (CMRR): Minimum of 100dB 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: Set by a single external resistor, allowing gains from 4 to 10,000.
Applications
- Pressure and Temperature Bridge Amplifiers: Suitable for precision measurement in bridge configurations.
- Industrial Process Control: Used in various industrial automation and control systems.
- Factory Automation: Ideal for precise signal amplification in automated factory environments.
- Multi-Channel Data Acquisition: Applicable in systems requiring multiple channels of precise signal amplification.
- Battery Operated Systems: Low power consumption makes it suitable for battery-powered devices.
- General Purpose Instrumentation: Versatile enough for a wide range of general-purpose instrumentation applications.
Q & A
- What is the typical quiescent current of the INA125PA?
The typical quiescent current is 460µA.
- What are the available precision voltage reference options for the INA125PA?
The precision voltage reference is externally adjustable with pin-selectable voltages of 2.5V, 5V, or 10V.
- How is the gain of the INA125PA adjusted?
The gain is set by connecting a single external resistor, RG, between pins 8 and 9, allowing gains from 4 to 10,000.
- What is the maximum offset voltage of the INA125PA?
The maximum offset voltage is 250µV.
- What is the common-mode rejection ratio (CMRR) of the INA125PA at a gain of 100?
The CMRR is a minimum of 100dB at G = 100.
- What is the input protection range of the INA125PA?
The input protection range is to ±40V.
- What are the package options for the INA125PA?
The INA125PA is available in 16-pin plastic DIP and SO-16 surface-mount packages.
- What is the operating temperature range of the INA125PA?
The operating temperature range is –40°C to +85°C.
- Does the INA125PA have a sleep mode?
Yes, the INA125PA has a sleep mode that allows shutdown and duty cycle operation to save power.
- What is the typical slew rate of the INA125PA at a gain of 4 with a 10V step?
The typical slew rate is 0.2 V/µs at G = 4 with a 10V step.
