Overview
The INA326EA/2K5G4, produced by Texas Instruments, is a high-performance, low-cost, precision instrumentation amplifier. It features rail-to-rail input and output capabilities, making it suitable for a wide range of applications from general-purpose to high-accuracy measurements. The INA326 is known for its excellent long-term stability, very low 1/f noise, and minimal offset voltage and drift, ensuring reliable performance over its operational life.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Supply Voltage | +2.7 | +5.5 | V | ||
| Input Offset Voltage, RTI | VS = +5V, VCM = VS/2 | ±20 | ±100 | ±124 | µV |
| Input Offset Drift | ±0.1 | ±0.4 | µV/°C | ||
| Power Supply Rejection Ratio (PSRR) | VS = +2.7V to +5.5V, VCM = VS/2 | ±20 | ±3 | µV/V | |
| Input Impedance, Differential | 10^10 || 2 Ω || pF | ||||
| Input Impedance, Common-Mode | 10^10 || 14 Ω || pF | ||||
| Operating Temperature Range | –40°C | +125°C | °C | ||
| Quiescent Current | IO = 0, Diff VIN = 0V, VS = +5V | 2.4 | 3.4 | mA | |
| Bandwidth, –3dB | G = 1 to 1k | 1 kHz | |||
| Slew Rate | VS = +5V, All Gains, CL = 100pF | V/µs |
Key Features
- Precision Low Offset: Maximum offset voltage of 100 µV and low offset drift of 0.4 µV/°C.
- Rail-to-Rail Input and Output: Input voltage range extends beyond the positive and negative power-supply rails.
- High Common-Mode Rejection (CMR): Unique internal topology ensures excellent CMR without the need for accurately matched resistors.
- Low Noise: Internal auto-correction circuitry eliminates virtually all 1/f noise.
- Input Protection: Internal diodes protect the input circuitry from overvoltage conditions.
- Flexible Gain Setting: Gain is set by external resistors R1 and R2, allowing for a wide range of gain settings.
Applications
The INA326EA/2K5G4 is suitable for various applications, including:
- General-Purpose Instrumentation: Ideal for measuring signals in a variety of industrial and medical devices.
- High-Accuracy Measurements: Used in precision measurement instruments where low offset and drift are critical.
- Thermocouple Amplification: Can be used to amplify thermocouple signals with high accuracy and low noise.
- Analog-to-Digital Conversion Pre-amplification: Often used as a pre-amplifier stage before analog-to-digital converters to enhance signal quality.
Q & A
- What is the maximum supply voltage for the INA326EA/2K5G4?
The maximum supply voltage is +5.5V. - What is the typical input offset voltage of the INA326EA/2K5G4?
The typical input offset voltage is ±100 µV. - What is the operating temperature range of the INA326EA/2K5G4?
The operating temperature range is –40°C to +125°C. - How is the gain of the INA326EA/2K5G4 set?
The gain is set by external resistors R1 and R2 using the equation G = 2(R2/R1). - Does the INA326EA/2K5G4 have input protection?
Yes, the inputs are protected with internal diodes connected to the power-supply rails. - What is the quiescent current of the INA326EA/2K5G4?
The quiescent current is typically 3.4 mA at VS = +5V. - Can the INA326EA/2K5G4 operate with single-supply or dual-supply configurations?
Yes, it can operate in both single-supply and dual-supply configurations. - What is the bandwidth of the INA326EA/2K5G4?
The bandwidth is 1 kHz for gains from 1 to 1000. - How does the INA326EA/2K5G4 achieve high common-mode rejection?
It uses a unique internal topology that converts the input voltage to a current, providing high CMR without the need for accurately matched resistors. - Is the INA326EA/2K5G4 available in different packages?
Yes, it is available in an MSOP-8 package.
