Overview
The INA126PA, produced by Texas Instruments, is a precision instrumentation amplifier designed for accurate and low-noise differential signal acquisition. This MicroPower instrumentation amplifier features a two-op-amp design, offering excellent performance with very low quiescent current of 175 μA per channel. It is suitable for a wide range of applications, including portable instrumentation and data acquisition systems, due to its wide operating voltage range of ±1.35 V to ±18 V and low offset voltage of 250 μV maximum.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Quiescent Current per Channel | IO = 0 | - | 175 | 200 | μA |
| Supply Voltage Range | - | ±1.35 | - | ±18 | V |
| Offset Voltage | RTI | - | 250 | 500 | μV |
| Offset Voltage Drift | TA = –40°C to +85°C | - | 3 | 5 | μV/°C |
| Noise Voltage | f = 1 kHz | - | 35 | - | nV/√Hz |
| Input Bias Current | - | - | 25 | - | nA |
| Input Impedance | - | 109 || 4 | - | - | Ω || pF |
| Bandwidth, –3 dB | G = 5 | - | 200 | - | kHz |
| Slew Rate | VO = ±10 V, G = 5 | - | 0.4 | - | V/μs |
| Temperature Range | - | -40 | - | 85 | °C |
Key Features
- Low quiescent current: 175 μA per channel, making it suitable for battery-powered devices.
- Wide supply range: ±1.35 V to ±18 V, allowing for flexibility in power supply configurations.
- Low offset voltage: 250 μV maximum, and low offset voltage drift of 3 μV/°C maximum, ensuring high accuracy.
- Low noise: 35 nV/√Hz at 1 kHz, which is crucial for precise signal acquisition.
- Low input bias current: 25 nA maximum, contributing to minimal input signal distortion.
- High input impedance: Approximately 10^9 Ω, ideal for high-impedance sources.
- Adjustable gain: From 5 V/V to 10000 V/V using a single external resistor.
- Multiple package options: Available in 8-pin PDIP, SOIC, and VSSOP for single-channel versions, and 16-pin PDIP, SOIC, and SSOP for dual-channel versions.
Applications
- Level transmitter and flow transmitter systems, where precise measurement of differential signals is required.
- Multiparameter patient monitors, where low noise and high accuracy are critical.
- Mixed modules involving analog input/output, digital input/output (AI, AO, DI, DO).
- AC charging stations, where stable and accurate signal processing is necessary.
- Infusion pumps and electrocardiogram (ECG) devices, requiring high precision and low noise.
Q & A
- What is the quiescent current of the INA126PA? The quiescent current is 175 μA per channel.
- What is the operating voltage range of the INA126PA? The operating voltage range is ±1.35 V to ±18 V.
- What is the maximum offset voltage of the INA126PA? The maximum offset voltage is 250 μV.
- How does the gain of the INA126PA get adjusted? The gain can be adjusted from 5 V/V to 10000 V/V using a single external resistor.
- What are the package options available for the INA126PA? It is available in 8-pin PDIP, SOIC, and VSSOP packages.
- What is the input impedance of the INA126PA? The input impedance is approximately 10^9 Ω.
- What is the slew rate of the INA126PA? The slew rate is 0.4 V/μs for a gain of 5.
- What are some common applications of the INA126PA? Common applications include level transmitters, flow transmitters, multiparameter patient monitors, and infusion pumps).
- What is the temperature range for the INA126PA? The operating temperature range is –40°C to +85°C).
- How does the INA126PA handle high-impedance power supplies? It may require decoupling capacitors close to the device pins to handle noisy or high-impedance power supplies).
