Overview
The INA126EA/2K5 from Texas Instruments is a precision instrumentation amplifier designed for accurate, low-noise, differential-signal acquisition. This device is part of the INAx126 family, which features a two-op-amp design that provides excellent performance with low quiescent current. The INA126EA/2K5 is particularly suited for portable instrumentation and data acquisition systems due to its wide operating voltage range and low power consumption.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Quiescent Current (per channel) | 175 μA (typ), 200 μA (max) | μA |
| Supply Voltage Range | ±1.35 V to ±18 V | V |
| Offset Voltage | 250 μV (max) | μV |
| Offset Voltage Drift | 3 μV/°C (max) | μV/°C |
| Noise Voltage | 35 nV/√Hz at 1 kHz | nV/√Hz |
| Input Bias Current | 25 nA (max) | nA |
| Temperature Range | –40°C to +85°C | °C |
| Gain Range | 5 V/V to 10000 V/V | V/V |
| Bandwidth (–3 dB) | 200 kHz at G = 5 | kHz |
| Common-Mode Rejection Ratio (CMRR) | 83 dB (min) at G = 5 | dB |
| Package | MSOP-8 |
Key Features
- Low quiescent current: 175 μA/channel, making it suitable for battery-powered devices.
- Wide supply range: ±1.35 V to ±18 V, allowing for flexibility in power supply configurations.
- Low offset voltage and drift: 250 μV maximum and 3 μV/°C maximum, respectively, ensuring high accuracy.
- Low noise: 35 nV/√Hz at 1 kHz, ideal for noise-sensitive applications.
- High input impedance: Approximately 10^9 Ω, suitable for high-impedance sources.
- Adjustable gain: Gain can be set from 5 V/V to 10000 V/V with a single external resistor.
- Multiple package options: Available in MSOP-8 and other packages for different application needs.
Applications
- Level transmitter and flow transmitter systems.
- Multiparameter patient monitors and medical devices.
- Mixed modules (AI, AO, DI, DO) in industrial automation.
- AC charging stations and infusion pumps.
- Electrocardiogram (ECG) and other biomedical instrumentation.
Q & A
- What is the typical quiescent current of the INA126EA/2K5?
The typical quiescent current is 175 μA per channel.
- What is the operating voltage range of the INA126EA/2K5?
The device operates within a supply voltage range of ±1.35 V to ±18 V.
- What is the maximum offset voltage of the INA126EA/2K5?
The maximum offset voltage is 250 μV.
- How is the gain of the INA126EA/2K5 adjusted?
The gain can be adjusted from 5 V/V to 10000 V/V using a single external resistor.
- What is the common-mode rejection ratio (CMRR) of the INA126EA/2K5?
The CMRR is at least 83 dB at a gain of 5.
- What are the package options for the INA126EA/2K5?
The device is available in MSOP-8 and other packages.
- What is the temperature range for the INA126EA/2K5?
The device operates over a temperature range of –40°C to +85°C.
- How does the INA126EA/2K5 handle input bias current?
The device requires a path for the input bias current, which is typically –10 nA, to prevent input amplifiers from saturating.
- What are some common applications of the INA126EA/2K5?
Common applications include level transmitters, flow transmitters, multiparameter patient monitors, and biomedical instrumentation.
- Can the INA126EA/2K5 be used in single-supply configurations?
Yes, the device can be used on single power supplies from 2.7 V to 36 V by using the output REF pin to level shift the internal output voltage.
