The INA240 device is a voltage-output, current-sense amplifier with enhanced PWM rejection that can sense drops across shunt resistors over a wide common-mode voltage range from –4 V to 80 V, independent of the supply voltage. The negative common-mode voltage allows the device to operate below ground, accommodating the flyback period of typical solenoid applications. Enhanced PWM rejection provides high levels of suppression for large common-mode transients (ΔV/Δt) in systems that use pulse width modulation (PWM) signals (such as motor drives and solenoid control systems). This feature allows for accurate current measurements without large transients and associated recovery ripple on the output voltage.
This device operates from a single 2.7-V to 5.5-V power supply, drawing a maximum of 2.4 mA of supply current. Four fixed gains are available: 20 V/V, 50 V/V, 100 V/V, and 200 V/V. The low offset of the zero-drift architecture enables current sensing with maximum drops across the shunt as low as 10-mV full-scale. All versions are specified over the extended operating temperature range (–40°C to +125°C), and are offered in an 8-pin TSSOP and 8-pin SOIC packages.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
INA240 | TSSOP (8) | 3.00 mm × 4.40 mm |
SOIC (8) | 4.90 mm × 3.91 mm |
Changes from Revision B (October 2017) to Revision C (December 2021)
Changes from Revision A (October 2016) to Revision B (October 2017)
Changes from Revision * (July 2016) to Revision A (October 2016)
PRODUCT | GAIN (V/V) |
---|---|
INA240A1 | 20 |
INA240A2 | 50 |
INA240A3 | 100 |
INA240A4 | 200 |
PIN | I/O | DESCRIPTION | ||
---|---|---|---|---|
NAME | PW (TSSOP) | D (SOIC) |
||
GND | 4 | 2 | Analog | Ground |
IN– | 3 | 1 | Analog input | Connect to load side of shunt resistor |
IN+ | 2 | 8 | Analog input | Connect to supply side of shunt resistor |
NC | 1 | 4 | — | Reserved. Connect to ground or leave floating |
OUT | 8 | 5 | Analog output | Output voltage |
REF1 | 7 | 7 | Analog input | Reference 1 voltage. Connect to 0 V to VS; see the Section 8.4.1 section for connection options |
REF2 | 6 | 3 | Analog input | Reference 2 voltage. Connect to 0 V to VS; see the Section 8.4.1 section for connection options |
VS | 5 | 6 | — | Power supply, 2.7 V to 5.5 V |