Overview
The INA148-Q1 is a precision, low-power, unity-gain difference amplifier produced by Texas Instruments. It is designed to handle high common-mode input voltage ranges, making it suitable for various automotive and industrial applications. The device features a monolithic, precision, bipolar operational amplifier with a laser-trimmed, thin-film resistor network. This configuration ensures accurate differential gain and high common-mode rejection over a wide temperature range of –40°C to 125°C. The INA148-Q1 operates on single or dual supplies, with a wide supply range from 2.7 V to 36 V for single supply and ±1.35 V to ±18 V for dual supplies.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Common-Mode Voltage Range | ±200 V (at VS = ±15 V) | V |
| Differential Gain | 1 V/V | V/V |
| Quiescent Current | 260 µA | µA |
| Supply Range (Single) | 2.7 V to 36 V | V |
| Supply Range (Dual) | ±1.35 V to ±18 V | V |
| Gain Error | 0.075% (Maximum) | % |
| Nonlinearity | 0.002% (Maximum) | % |
| Common-Mode Rejection Ratio (CMRR) | 86 dB | dB |
| Package Type | 8-pin SOIC | - |
| Operating Temperature Range | –40°C to 125°C | °C |
| Input Impedance | Approximately 1 MΩ | Ω |
Key Features
- Qualified for Automotive Applications: AEC-Q100 Qualified with Device Temperature Grade 1: –40°C to 125°C.
- High Common-Mode Voltage: Up to ±200 V at VS = ±15 V.
- Fixed Differential Gain: 1 V/V.
- Low Quiescent Current: 260 µA.
- Wide Supply Range: Single supply from 2.7 V to 36 V and dual supplies from ±1.35 V to ±18 V.
- Low Gain Error and Nonlinearity: 0.075% and 0.002% maximum, respectively.
- High CMRR: 86 dB.
- Surface-Mount 8-pin SOIC Package.
- External voltages can be summed into the amplifier's output using the REF pin.
Applications
- HEV/EV and Powertrain: Suitable for battery management systems and other high-voltage applications.
- HEV Battery Management: Ideal for monitoring and managing battery voltages and currents.
- Automotive Instrumentation: Used in various automotive measurement and monitoring systems.
- Current-Shunt Measurements: Measures current through shunt resistors accurately.
- Differential Sensor Amplifiers: Amplifies differential signals from sensors.
- Line Receivers: Receives and amplifies signals over long lines.
- Battery-Powered Systems: Suitable for systems powered by batteries, especially in automotive and industrial contexts.
- Stacked-Cell Monitors: Monitors voltage in stacked cell configurations.
Q & A
- What is the common-mode voltage range of the INA148-Q1?
The INA148-Q1 has a common-mode voltage range of up to ±200 V at VS = ±15 V.
- What is the differential gain of the INA148-Q1?
The differential gain of the INA148-Q1 is fixed at 1 V/V.
- What is the quiescent current of the INA148-Q1?
The quiescent current of the INA148-Q1 is 260 µA.
- What is the supply range for the INA148-Q1?
The INA148-Q1 can operate on a single supply from 2.7 V to 36 V and on dual supplies from ±1.35 V to ±18 V.
- What is the CMRR of the INA148-Q1?
The common-mode rejection ratio (CMRR) of the INA148-Q1 is 86 dB.
- What package type is the INA148-Q1 available in?
The INA148-Q1 is available in an 8-pin SOIC package.
- What is the operating temperature range of the INA148-Q1?
The operating temperature range of the INA148-Q1 is –40°C to 125°C.
- How does the REF pin influence the INA148-Q1's operation?
The REF pin allows external voltages to be summed into the amplifier's output, making the differential amplifier highly versatile.
- What are some typical applications of the INA148-Q1?
The INA148-Q1 is used in HEV/EV and powertrain applications, battery management, automotive instrumentation, current-shunt measurements, differential sensor amplifiers, line receivers, battery-powered systems, and stacked-cell monitors.
- Why is it important to maintain balanced input source impedances for the INA148-Q1?
Maintaining balanced input source impedances is crucial to ensure good common-mode rejection. A mismatch can degrade the CMRR significantly.
