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.
ORDER NUMBER | PACKAGE | BODY SIZE |
---|---|---|
INA225AIDGK | MSOP (8) | 3,0 mm x 3,0 mm |
Changes from * Revision (February 2014) to A Revision
TERMINAL | I/O | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
IN+ | 1 | Analog input | Connect to supply side of shunt resistor. |
GND | 2 | Analog | Ground |
VS | 3 | Analog | Power supply, 2.7 V to 36 V |
OUT | 4 | Analog output | Output voltage |
GS0 | 5 | Digital input | Gain select. Connect to VS or GND. Table 3 lists terminal settings and the corresponding gain value. |
GS1 | 6 | Digital input | Gain select. Connect to VS or GND. Table 3 lists terminal settings and the corresponding gain value. |
REF | 7 | Analog input | Reference voltage, 0 V to VS |
IN– | 8 | Analog input | Connect to load side of shunt resistor. |