Overview
The INA225AIDGKR from Texas Instruments is a 36-V, programmable-gain, voltage-output, bidirectional current-shunt monitor. This device is designed to sense drops across current-sensing resistors at common-mode voltages ranging from 0 V to 36 V, independent of the supply voltage. It features a zero-drift architecture, ensuring high accuracy and precision in current measurements. The INA225AIDGKR operates from a single +2.7-V to +36-V power supply and is specified over an extended operating temperature range of –40°C to +125°C.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Common-mode input range | TA = –40°C to +125°C | 0 | 36 | V | |
| Offset voltage, RTI | VSENSE = 0 mV | ±75 | ±150 | μV | |
| Offset voltage drift | TA = –40°C to +125°C | 0.2 | 0.5 | μV/°C | |
| Gain accuracy, over temperature | |||||
| 25 V/V, 50 V/V | ±0.15% | ||||
| 100 V/V | ±0.2% | ||||
| 200 V/V | ±0.3% | ||||
| Gain drift | 10 ppm/°C | ||||
| Bandwidth (Gain = 25 V/V) | 250 kHz | ||||
| Quiescent current | VSENSE = 0 mV | 300 | 350 | μA | |
| Operating voltage range | TA = –40°C to +125°C | +2.7 | +36 | V | |
| Specified temperature range | –40 | +125 | °C | ||
| Package | MSOP-8 |
Key Features
- Programmable Gain: Four discrete gain levels (25 V/V, 50 V/V, 100 V/V, and 200 V/V) selectable using the gain-select terminals (GS0 and GS1).
- Wide Common-Mode Range: Operates from 0 V to 36 V, independent of the supply voltage.
- Zero-Drift Architecture: Ensures low offset voltage (±150 μV max) and low offset voltage drift (0.5 μV/°C max).
- High Bandwidth: Up to 250 kHz at a gain of 25 V/V.
- Low Quiescent Current: Maximum of 350 μA.
- Extended Operating Temperature Range: –40°C to +125°C.
- Bidirectional Current Sensing: Allows measurement of current flowing in both directions across a current-sensing resistor).
Applications
- Power Supplies: For accurate current monitoring and control.
- Motor Control: To measure and control motor currents precisely.
- Computers and Telecom Equipment: For power management and current sensing in various electronic systems.
- Power Management: In power conversion and distribution systems).
- Test and Measurement: For precise current measurements in test equipment).
Q & A
- What is the INA225AIDGKR used for?
The INA225AIDGKR is used as a current-shunt monitor to sense drops across current-sensing resistors, allowing for precise measurement of current in various applications.
- What are the programmable gain levels of the INA225AIDGKR?
The device offers four programmable gain levels: 25 V/V, 50 V/V, 100 V/V, and 200 V/V, selected using the GS0 and GS1 terminals.
- What is the common-mode input range of the INA225AIDGKR?
The common-mode input range is from 0 V to 36 V.
- What is the maximum offset voltage of the INA225AIDGKR?
The maximum offset voltage is ±150 μV.
- What is the bandwidth of the INA225AIDGKR at a gain of 25 V/V?
The bandwidth is up to 250 kHz at a gain of 25 V/V.
- What is the quiescent current of the INA225AIDGKR?
The maximum quiescent current is 350 μA.
- What is the operating voltage range of the INA225AIDGKR?
The operating voltage range is from +2.7 V to +36 V.
- What is the specified temperature range of the INA225AIDGKR?
The specified temperature range is from –40°C to +125°C.
- In what package is the INA225AIDGKR available?
The device is available in an MSOP-8 package.
- What are some typical applications of the INA225AIDGKR?
Typical applications include power supplies, motor control, computers, telecom equipment, power management, and test and measurement.
