Overview
The INA125 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 amplifier is notable for its low offset voltage, low offset drift, and high common-mode rejection ratio, making it suitable for a variety of precision measurement applications. It operates on either single or dual supplies and features a precision voltage reference that is externally adjustable.
Key Specifications
| Parameter | Value |
|---|---|
| Quiescent Current | 460 µA |
| Precision Voltage Reference | 1.24V, 2.5V, 5V, or 10V |
| Offset Voltage | 250 µV max |
| Offset Drift | 2 µV/°C max |
| Input Bias Current | 20 nA max |
| Common-Mode Rejection Ratio (CMRR) | 100 dB min |
| Noise | 38 nV/√Hz at f = 1 kHz |
| Input Protection | ±40V |
| Supply Range (Single Supply) | 2.7V to 36V |
| Supply Range (Dual Supply) | ±1.35V to ±18V |
| Operating Temperature Range | -40°C to 85°C |
| Package Options | 16-pin DIP, SO-16 SOIC |
Key Features
- Low quiescent current: 460 µA
- Precision voltage reference: 1.24V, 2.5V, 5V, or 10V
- Sleep mode for power saving
- Low offset voltage: 250 µV max
- Low offset drift: 2 µV/°C max
- High CMRR: 100 dB min
- Low noise: 38 nV/√Hz at f = 1 kHz
- Input protection to ±40V
- Wide supply range: Single supply (2.7V to 36V), Dual supply (±1.35V to ±18V)
- Adjustable gain with a single external resistor (from 4 to 10,000)
Applications
- Bridge transducer circuits
- Strain gauge amplifiers
- Thermocouple amplifiers
- Medical instrumentation
- Industrial process control
- Test and measurement equipment
Q & A
- What is the quiescent current of the INA125?
The quiescent current of the INA125 is 460 µA. - What are the available precision voltage reference options for the INA125?
The INA125 offers precision voltage references of 1.24V, 2.5V, 5V, or 10V. - What is the maximum offset voltage of the INA125?
The maximum offset voltage of the INA125 is 250 µV. - Can the INA125 operate on both single and dual supplies?
Yes, the INA125 can operate on either single supplies (2.7V to 36V) or dual supplies (±1.35V to ±18V). - What is the common-mode rejection ratio (CMRR) of the INA125?
The CMRR of the INA125 is 100 dB min. - How is the gain of the INA125 adjusted?
The gain of the INA125 can be adjusted using a single external resistor, allowing gains from 4 to 10,000. - Does the INA125 have input protection?
Yes, the INA125 has input protection up to ±40V. - What are the package options for the INA125?
The INA125 is available in 16-pin DIP and SO-16 SOIC packages. - What is the operating temperature range of the INA125?
The operating temperature range of the INA125 is -40°C to 85°C. - Does the INA125 have a sleep mode?
Yes, the INA125 has a sleep mode to save power.
