Overview
The INA126UA is a precision instrumentation amplifier produced by Texas Instruments. It is part of the INAx126 family, which includes single-channel (INA126) and dual-channel (INA2126) versions. This amplifier is designed for accurate, low-noise, differential-signal acquisition and is particularly suited for portable instrumentation and data acquisition systems due to its low power consumption and wide operating voltage range.
The INA126UA features a two-operational-amplifier design that reduces power consumption while maintaining excellent performance. It operates with a quiescent current of 175 μA per channel and can be powered from supplies as low as ±1.35 V to ±18 V. The device is specified for an industrial temperature range of –40°C to +85°C, making it versatile for various applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Quiescent Current | - | 175 | - | μA/channel |
| Supply Voltage Range | ±1.35 | - | ±18 | V |
| Offset Voltage | - | - | 250 | μV |
| Offset Voltage Drift | - | - | 3 | μV/°C |
| Voltage Noise | - | - | 35 | nV/√Hz |
| Input Bias Current | - | - | 25 | nA |
| Common-Mode Rejection Ratio (CMRR) | 80 | - | 94 | dB |
| Gain Range | 5 | - | 10000 | V/V |
| Temperature Range | -40 | - | 85 | °C |
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 design.
- Low offset voltage: 250 μV maximum, and low offset voltage drift: 3 μV/°C maximum, ensuring high accuracy.
- Low noise: 35 nV/√Hz, which is crucial for precise signal acquisition.
- Low input bias current: 25 nA maximum, reducing the impact on the input signal.
- High common-mode rejection ratio (CMRR): up to 94 dB, ensuring effective rejection of common-mode signals.
- Gain can be set from 5 to 10,000 with a single external resistor.
- Multiple package options: SOIC (D), PDIP (P), and VSSOP (DGK) for the single-channel version.
Applications
- Level transmitter and flow transmitter systems.
- Multiparameter patient monitors and other 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 quiescent current of the INA126UA?
The quiescent current of the INA126UA is 175 μA per channel.
- What is the operating voltage range of the INA126UA?
The INA126UA operates from ±1.35 V to ±18 V.
- What is the maximum offset voltage of the INA126UA?
The maximum offset voltage is 250 μV.
- How is the gain of the INA126UA set?
The gain can be set from 5 to 10,000 using a single external resistor.
- What is the common-mode rejection ratio (CMRR) of the INA126UA?
The CMRR is up to 94 dB.
- What are the package options for the INA126UA?
The package options include SOIC (D), PDIP (P), and VSSOP (DGK).
- Can the INA126UA be used in single-supply configurations?
- What is the temperature range for the INA126UA?
The temperature range is –40°C to +85°C.
- How does the INA126UA handle input bias current?
The input bias current is typically –10 nA, and a path must be provided for this current to ensure proper operation.
- What are some typical applications of the INA126UA?
Typical applications include level transmitters, flow transmitters, multiparameter patient monitors, and biomedical instrumentation like ECGs.
