Overview
The INA126U/2K5, produced by Texas Instruments, is a precision instrumentation amplifier designed for accurate, low-noise, differential-signal acquisition. This device is part of the INAx126 family, which includes single-channel (INA126) and dual-channel (INA2126) versions. The INA126U/2K5 is specifically packaged in an 8-pin SOIC (D) package. It features a two-op-amp design that provides excellent performance with low quiescent current, making it suitable for portable instrumentation and data acquisition systems.
The amplifier offers a wide operating voltage range of ±1.35 V to ±18 V, low offset voltage, and low offset drift, ensuring high accuracy in various applications. The gain can be set from 5 V/V to 10,000 V/V using a single external resistor, providing flexibility in different measurement scenarios.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Quiescent Current (per channel) | - | 175 | 200 | μA |
| Supply Voltage Range | ±1.35 | - | ±18 | V |
| Offset Voltage | - | - | 250 | μV |
| Offset Voltage Drift | - | - | 3 | μV/°C |
| Input Bias Current | - | - | 25 | nA |
| Common-Mode Rejection Ratio (CMRR) | 80 | - | - | dB |
| Bandwidth (–3 dB) | - | - | 200 kHz (G = 5) | - |
| Temperature Range | -40 | - | 85 | °C |
| Input Noise Voltage | - | - | 35 | nV/√Hz |
| Input Noise Current | - | - | 160 | fA/√Hz |
Key Features
- Low Quiescent Current: 175 μA per channel, making it suitable for battery-powered and portable devices.
- Wide Supply Range: Operates from ±1.35 V to ±18 V, providing flexibility in various power supply configurations.
- Low Offset Voltage and Drift: Maximum offset voltage of 250 μV and offset drift of 3 μV/°C ensure high accuracy.
- Low Noise: Input-referred noise of 35 nV/√Hz and current noise of 160 fA/√Hz for precise signal acquisition.
- High Input Impedance: Approximately 10^9 Ω, allowing the signal source to have an unbalanced output impedance.
- Adjustable Gain: Gain can be set from 5 V/V to 10,000 V/V using a single external resistor.
- Multiple Package Options: Available in 8-pin PDIP, SOIC, and VSSOP packages.
- High Common-Mode Rejection Ratio (CMRR): Up to 94 dB, ensuring good rejection of common-mode signals.
Applications
- Level Transmitter: For precise measurement and transmission of level signals.
- Flow Transmitter: In flow measurement systems requiring high accuracy.
- Multiparameter Patient Monitor: For medical devices that need to monitor multiple physiological parameters.
- Mixed Module (AI, AO, DI, DO): In industrial automation and control systems.
- AC Charging (Pile) Station: For charging infrastructure requiring precise voltage and current measurements.
- Infusion Pump: In medical devices where accurate fluid flow control is critical.
- Electrocardiogram (ECG): For medical diagnostic equipment requiring low-noise signal acquisition.
Q & A
- What is the quiescent current of the INA126U/2K5?
The quiescent current of the INA126U/2K5 is 175 μA per channel, with a maximum of 200 μA.
- What is the supply voltage range of the INA126U/2K5?
The INA126U/2K5 operates from ±1.35 V to ±18 V.
- What is the maximum offset voltage of the INA126U/2K5?
The maximum offset voltage is 250 μV.
- How can the gain of the INA126U/2K5 be adjusted?
The gain can be set from 5 V/V to 10,000 V/V using a single external resistor.
- What is the input noise voltage of the INA126U/2K5?
The input-referred noise voltage is 35 nV/√Hz.
- What is the common-mode rejection ratio (CMRR) of the INA126U/2K5?
The CMRR is up to 94 dB.
- What are the package options for the INA126U/2K5?
The INA126U/2K5 is available in an 8-pin SOIC package, among other options like PDIP and VSSOP for the INA126 series.
- Can the INA126U/2K5 operate on a single power supply?
- What is the temperature range of the INA126U/2K5?
The INA126U/2K5 is specified for the –40°C to +85°C industrial temperature range.
- How does the INA126U/2K5 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.
