Overview
The INA128HD, produced by Texas Instruments, is a low-power, general-purpose instrumentation amplifier known for its excellent accuracy and versatility. This device is part of the INA128-HT series, which includes the INA128-HT and INA129-HT models. The INA128HD is designed with a three-operational-amplifier configuration and features current-feedback input circuitry, providing wide bandwidth even at high gain settings. It is laser trimmed for very low offset voltage and high common-mode rejection, making it ideal for a wide range of precision applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Offset Voltage (Vos) | 25 µV (Typical) | µV |
| Input Bias Current | 50 nA (Typical) | nA |
| Common Mode Rejection Ratio (CMRR) | 95 dB (Typical at G ≥ 100) | dB |
| Supply Voltage Range | ±2.25 V to ±18 V | V |
| Quiescent Current | 2 mA (Typical) | mA |
| Input Protection | Up to ±40 V | V |
| Output Current per Channel | 15 mA | mA |
| -3dB Bandwidth | 1.3 MHz | MHz |
| Package Type | 8-SOIC (0.154, 3.90mm Width) | |
| Operating Temperature Range | –55°C to 210°C | °C |
| RoHS Status | ROHS3 Compliant |
Key Features
- Low Offset Voltage: 25 µV Typical, ensuring high precision and accuracy.
- Low Input Bias Current: 50 nA Typical, minimizing errors in precision applications.
- High Common Mode Rejection Ratio (CMRR): 95 dB Typical at G ≥ 100, providing excellent noise rejection.
- Wide Supply Range: ±2.25 V to ±18 V, allowing flexibility in power supply design.
- Low Quiescent Current: 2 mA Typical, reducing power consumption.
- Inputs Protected to ±40 V, enhancing robustness against voltage spikes.
- Single External Resistor Sets Gain: From 1 to 10000, offering versatile gain settings.
- Current-Feedback Input Circuitry: Providing wide bandwidth even at high gain settings.
- Supports Extreme Temperature Applications: With a temperature range of –55°C to 210°C.
Applications
- Bridge Amplifiers: Suitable for strain gauge and bridge sensor applications.
- Thermocouple Amplifiers: Ideal for temperature measurement systems.
- RTD Sensor Amplifiers: Used in resistance temperature detector applications.
- Medical Instrumentation: Suitable for medical devices requiring high accuracy and low noise.
- Data Acquisition: Used in data acquisition systems for precise signal amplification.
Q & A
- What is the typical input offset voltage of the INA128HD?
The typical input offset voltage is 25 µV.
- What is the input bias current of the INA128HD?
The typical input bias current is 50 nA.
- What is the common mode rejection ratio (CMRR) of the INA128HD?
The CMRR is typically 95 dB at G ≥ 100.
- What is the supply voltage range for the INA128HD?
The supply voltage range is ±2.25 V to ±18 V.
- How much quiescent current does the INA128HD consume?
The quiescent current is typically 2 mA.
- What is the maximum input protection voltage for the INA128HD?
The inputs are protected up to ±40 V.
- What is the maximum output current per channel for the INA128HD?
The maximum output current per channel is 15 mA.
- What is the -3dB bandwidth of the INA128HD?
The -3dB bandwidth is 1.3 MHz.
- In what temperature range can the INA128HD operate?
The operating temperature range is –55°C to 210°C.
- Is the INA128HD RoHS compliant?
Yes, the INA128HD is ROHS3 compliant.
