Overview
The INA148UA/2K5G4 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 industrial and automotive applications. The amplifier features a monolithic precision bipolar op amp with a thin-film resistor network that is laser-trimmed for accurate differential gain and high common-mode rejection. It 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 | ||
| Power Supply Range | Dual Supplies | ±1.35V | ±18V | ||
| Quiescent Current | VIN = 0, IO = 0 | ±260 | ±300 | µA | |
| Temperature Range | Specified | –40°C | +85°C | ||
| Small Signal Bandwidth | 100 kHz | ||||
| Slew Rate | 1 V/µs | ||||
| Output Voltage Range | RL = 10kΩ | (V–) + 0.5 | (V+) – 1.5 | ||
| Output Current | Short-Circuit Current Continuous to Common | ±13 | mA |
Key Features
- High Common-Mode Voltage Range: Up to ±200V at VS = ±15V.
- Fixed Differential Gain: 1V/V, achieved through a laser-trimmed thin-film 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 and Nonlinearity: 0.075% max gain error and 0.002% max nonlinearity.
- High Common-Mode Rejection Ratio (CMRR): 86dB.
- Compact Package: Available in an SO-8 surface-mount package.
- Versatile Design: Allows external voltages to be summed into the amplifier’s output via the Ref pin.
Applications
- Current Shunt Measurements: Suitable for high-accuracy current measurements in various applications.
- Differential Sensor Amplifiers: Ideal for amplifying differential signals from sensors).
- Line Receivers: Used in line receiver applications requiring high common-mode rejection).
- Battery Powered Systems: Low power consumption makes it suitable for battery-powered systems).
- Automotive Instrumentation: High common-mode voltage range and robust performance make it suitable for automotive applications).
- Stacked Cell Monitors: Can be used to monitor voltages in stacked cell configurations).
Q & A
- What is the common-mode voltage range of the INA148UA/2K5G4?
The INA148UA/2K5G4 has a common-mode voltage range of up to ±200V at VS = ±15V.
- What is the differential gain of the INA148UA/2K5G4?
The differential gain is fixed at 1V/V, achieved through a laser-trimmed thin-film resistor network).
- What is the quiescent current of the INA148UA/2K5G4?
The quiescent current is 260µA).
- What is the operating temperature range of the INA148UA/2K5G4?
The specified operating temperature range is –40°C to +85°C).
- What package type is the INA148UA/2K5G4 available in?
The INA148UA/2K5G4 is available in an SO-8 surface-mount package).
- Can the INA148UA/2K5G4 be used in battery-powered systems?
Yes, its low power consumption makes it suitable for battery-powered systems).
- How does the INA148UA/2K5G4 handle high input voltages?
The INA148UA/2K5G4 features a 20:1 input voltage divider ratio that reduces high input voltages to within the linear operating range of the internal op amp).
- Can external voltages be summed into the amplifier’s output?
Yes, external voltages can be summed into the amplifier’s output via the Ref pin).
- What is the common-mode rejection ratio (CMRR) of the INA148UA/2K5G4?
The CMRR is 86dB).
- What are some typical applications of the INA148UA/2K5G4?
Typical applications include current shunt measurements, differential sensor amplifiers, line receivers, battery-powered systems, automotive instrumentation, and stacked cell monitors).
