Overview
The INA126EA/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 INA126EA/250 is particularly noted for its low power consumption, wide operating voltage range, and high accuracy, making it an excellent choice for portable instrumentation and data acquisition systems.
The two-op-amp design of the INA126EA/250 provides excellent performance with a low quiescent current of 175 μA per channel. The device operates over a wide supply range of ±1.35 V to ±18 V and features low offset voltage and drift, as well as low noise and input bias current. These characteristics, combined with a high input impedance and excellent common-mode rejection, make the INA126EA/250 highly 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 |
| Noise Voltage | - | - | 35 | nV/√Hz |
| Input Bias Current | - | - | 25 | nA |
| Temperature Range | -40 | - | 85 | °C |
| Gain Range | 5 | - | 10000 | V/V |
| Common-Mode Rejection Ratio (CMRR) | 74 | - | 94 | dB |
| Bandwidth (–3 dB) | - | - | 200 kHz (G = 5) | - |
Key Features
- Low Power Consumption: Quiescent current of 175 μA per channel.
- Wide Supply Range: Operates from ±1.35 V to ±18 V.
- Low Offset Voltage and Drift: Maximum offset voltage of 250 μV and drift of 3 μV/°C.
- Low Noise: Voltage noise of 35 nV/√Hz.
- High Input Impedance: Approximately 10^9 Ω.
- Excellent Common-Mode Rejection: CMRR up to 94 dB.
- Adjustable Gain: Gain can be set from 5 V/V to 10000 V/V with a single external resistor.
- Multiple Package Options: Available in PDIP, SOIC, and VSSOP packages.
Applications
- Level Transmitter: For precise measurement and transmission of signal levels.
- Flow Transmitter: In systems requiring accurate flow rate measurements.
- Multiparameter Patient Monitor: For medical devices needing multiple parameter monitoring.
- Mixed Module (AI, AO, DI, DO): In industrial automation and control systems.
- AC Charging (Pile) Station: For charging infrastructure requiring precise voltage and current monitoring.
- Infusion Pump: In medical devices where precise fluid flow control is necessary.
- Electrocardiogram (ECG): For medical diagnostic equipment.
Q & A
- What is the quiescent current of the INA126EA/250?
The quiescent current of the INA126EA/250 is 175 μA per channel.
- What is the operating voltage range of the INA126EA/250?
The INA126EA/250 operates over a supply range of ±1.35 V to ±18 V.
- What is the maximum offset voltage of the INA126EA/250?
The maximum offset voltage is 250 μV.
- How is the gain of the INA126EA/250 adjusted?
The gain can be set from 5 V/V to 10000 V/V with a single external resistor.
- What is the common-mode rejection ratio (CMRR) of the INA126EA/250?
The CMRR is up to 94 dB.
- What are the package options available for the INA126EA/250?
The device is available in PDIP, SOIC, and VSSOP packages.
- What is the temperature range for the INA126EA/250?
The device operates over a temperature range of –40°C to +85°C.
- How does the INA126EA/250 handle input bias current?
The device requires a path for the input bias current, which can be provided using resistors to ensure proper operation.
- Can the INA126EA/250 be used in single-supply configurations?
Yes, the INA126EA/250 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.
- What are some typical applications of the INA126EA/250?
Typical applications include level transmitters, flow transmitters, multiparameter patient monitors, mixed modules (AI, AO, DI, DO), AC charging stations, infusion pumps, and electrocardiograms (ECG).
