Overview
The INA212AIDCKR, part of the INA21x series from Texas Instruments, is a high-precision, zero-drift current-sensing amplifier. This device is designed to accurately measure voltages developed across current-sensing resistors in both low-side and high-side configurations. It features a wide common-mode range of –0.3 V to 26 V, making it suitable for measuring current on input voltage rails up to 26 V while being powered from supply voltages as low as 2.7 V.
The zero-drift topology of the INA212AIDCKR ensures high-precision measurements with a maximum input offset voltage of ±35 μV and a temperature drift of 0.5 μV/°C over the full temperature range of –40°C to +125°C. This makes it ideal for applications requiring accurate current sensing over a wide dynamic range.
Key Specifications
| Parameter | Test Conditions | Min | Max | Unit | |
|---|---|---|---|---|---|
| Common-mode input range | TA = –40°C to +125°C | –0.3 | 26 | V | |
| Offset voltage, RTI | VSENSE = 0 mV | ±0.55 | ±35 | µV | |
| dVOS/dT | RTI vs temperature, VSENSE = 0 mV, TA = –40°C to +125°C | 0.1 | 0.5 | µV/°C | |
| Gain | 1000 | V/V | |||
| Gain error | VSENSE = –5 mV to 5 mV, TA = –40°C to +125°C (Version C) | ±0.02% | ±0.5% | % | |
| Bandwidth | CLOAD = 10 pF | 4 | kHz | ||
| Slew rate | 0.4 | V/µs | |||
| Operating voltage range | TA = –40°C to +125°C | 2.7 | 26 | V | |
| Quiescent current | VSENSE = 0 mV | 65 | 100 | µA | |
| Temperature range | Specified range | –40 | 125 | °C |
Key Features
- Wide Common-Mode Range: –0.3 V to 26 V, allowing for current measurement on high-voltage rails while being powered from lower supply voltages.
- High Precision: Maximum input offset voltage of ±35 μV and a temperature drift of 0.5 μV/°C.
- Low Gain Error: ±0.5% maximum gain error over temperature for Version C.
- High Common-Mode Rejection Ratio (CMRR): Up to 140 dB, ensuring minimal interference from common-mode signals.
- Low Quiescent Current: Maximum of 100 μA, making it power-efficient.
- Compact Packaging: Available in SC70 and Thin UQFN packages.
Applications
- Notebook Computers: For precise current sensing in power management systems.
- Cell Phones: To monitor and manage battery charging and discharging currents.
- Telecom Equipment: For accurate current measurement in high-reliability applications.
- Power Management: In various power supply and battery management systems.
- Battery Chargers: To ensure accurate and efficient charging processes.
Q & A
- What is the common-mode input range of the INA212AIDCKR?
The common-mode input range is –0.3 V to 26 V.
- What is the maximum input offset voltage of the INA212AIDCKR?
The maximum input offset voltage is ±35 μV.
- What is the gain of the INA212AIDCKR?
The gain of the INA212AIDCKR is 1000 V/V.
- What is the typical bandwidth of the INA212AIDCKR?
The typical bandwidth is 4 kHz with a 10 pF load capacitance.
- What is the operating voltage range of the INA212AIDCKR?
The operating voltage range is 2.7 V to 26 V.
- What is the maximum quiescent current of the INA212AIDCKR?
The maximum quiescent current is 100 μA.
- What are the typical applications of the INA212AIDCKR?
Typical applications include notebook computers, cell phones, telecom equipment, power management, and battery chargers.
- What is the temperature range of the INA212AIDCKR?
The specified temperature range is –40°C to +125°C.
- What is the slew rate of the INA212AIDCKR?
The slew rate is 0.4 V/µs.
- What packaging options are available for the INA212AIDCKR?
The device is available in SC70 and Thin UQFN packages.
