Overview
The INA148UA/2K5 is a precision, low-power, unity-gain difference amplifier produced by Texas Instruments. It is designed with a high common-mode input voltage range and features a monolithic precision bipolar op amp with a thin-film resistor network. The on-chip resistors are laser trimmed to ensure accurate 1V/V differential gain and high common-mode rejection. This amplifier operates on single or dual supplies and is available in a small SO-8 surface-mount package, specified for the –40°C to +85°C extended industrial temperature range.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Input Offset Voltage (VOS) | VS = ±15V, VCM = 0V | ±1 | ±5 | - | mV |
| Drift ∆VOS/∆T | At TA = –40°C to +85°C | - | ±10 | - | µV/°C |
| Common-Mode Voltage Range | VS = +5V | - | +75V | - | V |
| Common-Mode Voltage Range | VS = ±15V | - | ±200V | - | V |
| Differential Gain | - | - | 1V/V | - | - |
| Quiescent Current | VIN = 0, IO = 0 | - | 260µA | 300µA | µA |
| Supply Range (Single) | - | 2.7V | - | 36V | V |
| Supply Range (Dual) | - | ±1.35V | - | ±18V | V |
| Gain Error | - | - | 0.075% | - | % |
| Nonlinearity | - | - | 0.002% | - | % |
| Common-Mode Rejection Ratio (CMRR) | - | - | 86dB | - | dB |
| Operating Temperature Range | - | -40°C | - | 85°C | °C |
| Package | - | - | SO-8 | - | - |
Key Features
- Low Nonlinearity: 0.002% maximum, ensuring high accuracy in signal amplification.
- High Common-Mode Voltage Range: Up to +75V at VS = +5V and ±200V at VS = ±15V.
- Fixed Differential Gain: 1V/V, maintained by the on-chip laser-trimmed resistor network.
- Low Quiescent Current: 260µA, making it suitable for low-power applications.
- Wide Supply Range: Single supply from 2.7V to 36V and dual supplies from ±1.35V to ±18V.
- Low Gain Error: 0.075% maximum, contributing to high gain accuracy.
- High Common-Mode Rejection Ratio (CMRR): 86dB, ensuring minimal interference from common-mode signals.
- Compact SO-8 Package: Suitable for surface-mount applications and specified for the –40°C to +85°C extended industrial temperature range).
Applications
- Current Shunt Measurements: Ideal for measuring current in high-side shunt configurations due to its high common-mode voltage range.
- Differential Sensor Amplifiers: Used in applications requiring the amplification of differential signals from sensors).
- Line Receivers: Suitable for receiving and amplifying differential signals over long cables or in noisy environments).
- Battery Powered Systems: Low power consumption makes it suitable for battery-powered devices).
- Automotive Instrumentation: High common-mode voltage range and robust performance make it ideal for automotive applications).
- Stacked Cell Monitors: Used in monitoring and balancing stacked battery cells due to its ability to handle high common-mode voltages).
Q & A
- What is the common-mode voltage range of the INA148UA/2K5?
The INA148UA/2K5 has a common-mode voltage range of up to +75V at VS = +5V and ±200V at VS = ±15V).
- What is the differential gain of the INA148UA/2K5?
The differential gain is fixed at 1V/V, maintained by the on-chip laser-trimmed resistor network).
- What is the quiescent current of the INA148UA/2K5?
The quiescent current is 260µA, making it suitable for low-power applications).
- What is the supply voltage range for the INA148UA/2K5?
The INA148UA/2K5 can operate on single supplies from 2.7V to 36V and dual supplies from ±1.35V to ±18V).
- What is the common-mode rejection ratio (CMRR) of the INA148UA/2K5?
The CMRR is 86dB, ensuring minimal interference from common-mode signals).
- In what package is the INA148UA/2K5 available?
The INA148UA/2K5 is available in a small SO-8 surface-mount package).
- What are some typical applications of the INA148UA/2K5?
Typical applications include current shunt measurements, differential sensor amplifiers, line receivers, battery-powered systems, automotive instrumentation, and stacked cell monitors).
- How does the INA148UA/2K5 handle high input voltages?
The INA148UA/2K5 features a precision laser-trimmed thin-film resistor network with a 20:1 input voltage divider ratio, reducing high input voltages to within the linear operating range of the internal op amp).
- What is the operating temperature range of the INA148UA/2K5?
The operating temperature range is –40°C to +85°C).
- Can the INA148UA/2K5 be used in automotive applications?
Yes, the high common-mode voltage range and robust performance make it ideal for automotive applications).
