Overview
The INA2126E/250, 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 both single-channel (INA126) and dual-channel (INA2126) versions. The INA2126E/250 is specifically packaged in a 16-pin SSOP (DBQ) package, making it suitable for a variety of applications requiring high precision and low power consumption.
The two-op-amp design of the INA2126E/250 provides excellent performance with low quiescent current, making it an ideal choice for portable instrumentation and data acquisition systems. The device operates over a wide supply voltage range of ±1.35 V to ±18 V and is specified for the –40°C to +85°C industrial temperature range.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (Dual Supply) | - | - | ±18 | V |
| Supply Voltage (Single Supply) | - | - | 36 | V |
| Quiescent Current per Channel | - | - | 175 | μA |
| Offset Voltage | - | - | 250 | μV |
| Offset Voltage Drift | - | - | 3 | μV/°C |
| Voltage Noise at 1 kHz | - | - | 35 | nV/√Hz |
| Input Bias Current | - | - | 25 | nA |
| Common-Mode Rejection Ratio (CMRR) | 80 | - | 94 | dB |
| Gain Range | 5 | - | 10000 | V/V |
| Bandwidth at G = 5 | - | - | 200 | kHz |
| Slew Rate | - | - | 1.5 | V/μs |
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, allowing flexibility in system design.
- Low offset voltage and drift: Maximum offset voltage of 250 μV and drift of 3 μV/°C ensure high accuracy.
- Low noise: Voltage noise of 35 nV/√Hz at 1 kHz and current noise of 160 fA/√Hz at 1 kHz.
- High input impedance: Approximately 10^9 Ω, which is beneficial for high-impedance sources.
- Adjustable gain: Gain can be set from 5 V/V to 10000 V/V using a single external resistor.
- Multiple package options: Available in PDIP, SOIC, and SSOP packages to suit different design needs.
Applications
- Level transmitter and flow transmitter systems.
- Multiparameter patient monitors and medical equipment.
- Mixed modules (AI, AO, DI, DO) in industrial automation.
- AC charging stations and electric vehicle charging systems.
- Infusion pumps and other medical devices requiring precise signal amplification.
- Electrocardiogram (ECG) and other biomedical signal acquisition systems.
Q & A
- What is the typical quiescent current of the INA2126E/250?
The typical quiescent current is 175 μA per channel.
- What is the operating temperature range of the INA2126E/250?
The device operates over a temperature range of –40°C to +85°C.
- What is the maximum offset voltage of the INA2126E/250?
The maximum offset voltage is 250 μV.
- How can the gain of the INA2126E/250 be 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 INA2126E/250?
The CMRR is typically 80 dB to 94 dB.
- What are the package options available for the INA2126?
The INA2126 is available in PDIP, SOIC, and SSOP packages.
- What is the input impedance of the INA2126E/250?
The input impedance is approximately 10^9 Ω.
- How does the INA2126E/250 handle input bias current?
The device requires a path for the input bias current; high input impedance means this current changes very little with varying input voltage.
- What is the bandwidth of the INA2126E/250 at a gain of 5?
The bandwidth at a gain of 5 is 200 kHz.
- What are some typical applications of the INA2126E/250?
Typical applications include level transmitters, flow transmitters, multiparameter patient monitors, and infusion pumps.
