Overview
The INA148UAG4, produced by Texas Instruments, is a precision, low-power, unity-gain difference amplifier designed to handle high common-mode input voltage ranges. This component is part of the INA148 family and is known for its high accuracy and reliability. It features a monolithic precision bipolar op amp with a thin-film resistor network, which is laser-trimmed to ensure accurate differential gain and high common-mode rejection. The INA148UAG4 operates on single or dual supplies and is specified for an extended industrial temperature range of –40°C to +85°C.
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 | |
| Operating Temperature Range | –40°C | +85°C | |||
| Small Signal Bandwidth | 100 kHz | ||||
| Slew Rate | 1 V/µs | ||||
| Settling Time (0.1% and 0.01%) | VS = ±15V, 10V Step | 21 µs (0.1%) | 25 µs (0.01%) | µs | |
| Output Voltage Range | RL = 10kΩ | (V–) + 0.5 | (V+) – 1.5 | V | |
| Output Current (IO) | Short-Circuit Current Continuous to Common | ±13 mA | mA |
Key Features
- High Common-Mode Voltage Range: Up to ±200V at VS = ±15V and +75V at VS = +5V.
- Fixed Differential Gain: Precisely 1V/V.
- Low Quiescent Current: 260µA.
- 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 and 0.002% max respectively.
- High Common-Mode Rejection Ratio (CMRR): 86dB.
- Small SO-8 Surface-Mount Package: Suitable for compact designs.
- Extended Industrial Temperature Range: –40°C to +85°C.
- Versatile Design: Allows external voltages to be summed into the amplifier’s output via the Ref pin.
Applications
- Current Shunt Measurements: Ideal for high-accuracy current sensing.
- Differential Sensor Amplifiers: Suitable for amplifying signals from differential sensors.
- Line Receivers: Used in applications requiring high common-mode rejection.
- Battery Powered Systems: Low power consumption makes it suitable for battery-powered devices.
- Automotive Instrumentation: Qualified for high-reliability automotive applications.
- Stacked Cell Monitors: Useful in monitoring high-voltage battery stacks.
Q & A
- What is the maximum common-mode input voltage range of the INA148UAG4?
The INA148UAG4 can handle a common-mode input voltage range of up to ±200V at VS = ±15V and +75V at VS = +5V.
- What is the differential gain of the INA148UAG4?
The differential gain is precisely 1V/V.
- What is the quiescent current of the INA148UAG4?
The quiescent current is 260µA.
- What is the operating temperature range of the INA148UAG4?
The operating temperature range is –40°C to +85°C.
- Can the INA148UAG4 be used with single or dual supplies?
Yes, it can operate on both single and dual supplies.
- What is the typical small signal bandwidth of the INA148UAG4?
The typical small signal bandwidth is 100 kHz.
- How does the INA148UAG4 handle high input voltages?
The INA148UAG4 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 output of the INA148UAG4?
Yes, external voltages can be summed into the output via the Ref pin.
- What are some common applications of the INA148UAG4?
Common applications include current shunt measurements, differential sensor amplifiers, line receivers, battery-powered systems, automotive instrumentation, and stacked cell monitors.
- Is the INA148UAG4 suitable for high-reliability automotive applications?
Yes, it is qualified for high-reliability automotive applications (INA148-Q1).
