Overview
The INA145UA/2K5, produced by Texas Instruments, is a precision, unity-gain difference amplifier. It consists of a precision op amp and an on-chip precision resistor network. This device is designed to provide high accuracy and stability, making it suitable for a variety of applications requiring differential signal amplification.
The INA145UA/2K5 is available in an SO-8 surface-mount package and is specified for the extended industrial temperature range of –40°C to +85°C. It offers programmable gain from 1V/V to 1000V/V, set by two external resistors, and features low quiescent current, a wide supply range, and high common-mode rejection ratio (CMRR).
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Offset Voltage (VOS) | - | - | ±0.5 mV | mV |
| Input Bias Current (IB) | - | - | ±50 nA | nA |
| Common-Mode Rejection Ratio (CMRR) | - | - | 86 dB | dB |
| Supply Voltage Range (Single Supply) | 4.5 | - | 36 | V |
| Supply Voltage Range (Dual Supplies) | ±2.25 | - | ±18 | V |
| Quiescent Current | 550 | 570 | 700 | µA |
| Operating Temperature Range | -40 | - | +85 | °C |
| Small Signal Bandwidth (G = 1) | - | - | 500 kHz | kHz |
| Slew Rate | - | - | 0.45 V/µs | V/µs |
Key Features
- Programmable Gain: The gain can be set from 1V/V to 1000V/V using two external resistors.
- Low Quiescent Current: The device operates with a quiescent current of 570 µA.
- Wide Supply Range: It supports single supply voltages from 4.5V to 36V and dual supplies from ±2.25V to ±18V.
- High Common-Mode Rejection Ratio (CMRR): Offers a CMRR of 86 dB.
- High Common-Mode Voltage Range: The input common-mode voltage range extends beyond the positive and negative rails.
- Low Gain Error: Features a low gain error of 0.01%.
- SO-8 Package: Available in an SO-8 surface-mount package.
Applications
- Current Shunt Measurements: Suitable for measuring current through shunt resistors.
- Sensor Amplifier: Can be used to amplify signals from various sensors.
- Differential Line Receiver: Ideal for receiving and amplifying differential signals.
- Battery Powered Systems: Suitable for use in battery-powered systems due to its low quiescent current.
Q & A
- What is the gain range of the INA145UA/2K5?
The gain can be set from 1V/V to 1000V/V using two external resistors.
- What is the typical quiescent current of the INA145UA/2K5?
The typical quiescent current is 570 µA.
- What is the operating temperature range of the INA145UA/2K5?
The operating temperature range is –40°C to +85°C.
- What is the common-mode rejection ratio (CMRR) of the INA145UA/2K5?
The CMRR is 86 dB.
- Can the INA145UA/2K5 be used with single or dual supplies?
Yes, it can be used with single supply voltages from 4.5V to 36V and dual supplies from ±2.25V to ±18V.
- What is the typical slew rate of the INA145UA/2K5?
The typical slew rate is 0.45 V/µs.
- How is the gain set on the INA145UA/2K5?
The gain is set using two external resistors, RG1 and RG2, according to the equation: G = 1 + RG2/RG1.
- What is the input impedance of the INA145UA/2K5?
The input impedance is approximately 40kΩ.
- Is the INA145UA/2K5 suitable for battery-powered systems?
Yes, it is suitable due to its low quiescent current.
- What package type is the INA145UA/2K5 available in?
It is available in an SO-8 surface-mount package.
