INA225AIDGK

Part: INA225AIDGK (INA225) — Texas Instruments

Type: Bidirectional, Zero-Drift, Programmable-Gain Current-Shunt Monitor (Voltage Output)

Description: 0–36 V common-mode, 2.7–36 V supply, programmable-gain (25/50/100/200 V/V) bidirectional current-sense amplifier with ±150 μV max offset and 350 μA max quiescent current in an MSOP-8 package.

Operating Conditions:

• Supply voltage: 2.7–36 V
• Operating temperature: -40 to +125 °C (specified range)
• Common-mode input range: 0 to 36 V
• Reference input range: 0 V to VS

Absolute Maximum Ratings:

• Max supply voltage: 40 V
• Analog inputs differential (VIN+ − VIN−): ±40 V
• Analog inputs common-mode: GND − 0.3 V to +40 V
• REF, GS0, GS1 inputs and output: GND − 0.3 V to VS + 0.3 V
• Max junction temperature: 150 °C
• Storage temperature: -65 to +150 °C
• ESD: HBM 4 kV, CDM 1 kV

Key Specs:

• Offset voltage (RTI, VSENSE = 0 mV): ±75 μV typ, ±150 μV max
• Offset drift: 0.2 μV/°C typ, 0.5 μV/°C max (-40 to +125 °C)
• Gain error (-40 to +125 °C): ±0.15% max (25, 50 V/V); ±0.2% max (100 V/V); ±0.3% max (200 V/V)
• Gain drift: 3 ppm/°C typ, 10 ppm/°C max (25, 50, 100 V/V); 5 ppm/°C typ, 15 ppm/°C max (200 V/V)
• CMR: 105 dB (VIN+ = 0 to 36 V, -40 to +125 °C)
• Bandwidth: 250 kHz (25 V/V), 200 kHz (50 V/V), 125 kHz (100 V/V), 70 kHz (200 V/V), CLOAD = 10 pF
• Slew rate: 0.4 V/μs; voltage noise density 50 nV/√Hz
• Quiescent current: 300 μA typ, 350 μA max at 25 °C; 375 μA max over temperature
• Input bias current: 72 μA typ, 85 μA max

Features:

• Wide common-mode range: 0 V to 36 V
• Pin-selectable gains via GS0 and GS1: 25, 50, 100, 200 V/V
• Zero-drift architecture
• Bidirectional sensing with external reference
• Full-scale shunt drop as low as 10 mV

Applications:

• Power supplies
• Motor control
• Computers
• Telecom equipment
• Power management
• Test and measurement

Package:

• MSOP-8 (DGK), 3.0 mm × 3.0 mm body

• Power Supplies
• Motor Control
• Computers
• Telecom Equipment
• Power Management
• Test and Measurement

1

The INA225 is a voltage-output, current-sense amplifier that senses drops across current-sensing resistors at common-mode voltages that can vary from 0 V to 36 V, independent of the supply voltage. The device is a bidirectional, current-shunt monitor that allows an external reference to be used to measure current flowing in both directions across a current-sensing resistor.

Four discrete gain levels are selectable using the two gain-select terminals (GS0 and GS1) to program gains of 25 V/V, 50 V/V, 100 V/V, and 200 V/V. The low-offset, zero-drift architecture and precision gain values enable current-sensing with maximum drops across the shunt as low as 10 mV of full-scale while maintaining very high accuracy measurements over the entire operating temperature range.

The device operates from a single +2.7-V to +36-V power supply, drawing a maximum of 350 μ A of supply current. The device is specified over the extended operating temperature range (-40°C to +125°C), and is offered in an MSOP-8 package.

At TA = +25°C, VSENSE = VIN+ - VIN, VS = +5 V, VIN+ = 12 V, and VREF = VS / 2, unless otherwise noted.

Over operating free-air temperature range, unless otherwise noted.

Over operating free-air temperature range, unless otherwise noted.

The INA225 measures the voltage developed across a current-sensing resistor when current passes through it. The ability to drive the reference terminal to adjust the functionality of the output signal offers multiple configurations discussed throughout this section.