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 µA 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.
|Common mode voltage (Max) (V)|
|Common mode voltage (Min) (V)|
|Input offset (+/-) (Max) (uV)|
|Input offset drift (+/-) (Typ) (uV/C)|
|Gain error (%)|
|Gain error drift (+/-) (Max) (ppm/°C)|
|CMRR (Min) (dB)|
|Supply Voltage (Max) (V)|
|Supply Voltage (Min) (V)|
|Iq (Max) (mA)|
|Number of channels (#)|
|Operating temperature range (C)|
|Package size: mm2:W x L (PKG)|
|-40 to 125|
|VSSOP | 8|
|8VSSOP: 15 mm2: 4.9 x 3 (VSSOP | 8)|