Features
Enhanced PWM rejection optimized for systems subject to switching common-mode voltages
Excellent CMRR
– 130dB (min)
– 106dB AC CMRR at 50kHz
Wide common-mode voltage:
−6V to 72V
Accuracy:
–Gain error :0.1%,9ppm/℃ drift(max)
–Offset voltage:
±20uV,0.6uV/℃ drift (max)
Bandwidth: 1.1 MHz
Low Quiescent Current:
Available gains:
AWS72240A1:10V/V
AWS72240A2:20V/V
AWS72240A3:50V/V
AWS72240A4:100V/V
AWS72240A5:200V/V
Description
The AWS72240 is an ultra-precise, bidirectional current sense amplifier that can measure voltage drops across shunt resistors over a wide common-mode range from –6 to 72V, independent of the supply voltage. The high-precision current measurement is achieved through a combination of low offset voltage (±20µV, maximum), small gain error and a high DC CMRR . The AWS72240 is designed for high voltage, bidirectional measurements in switching systems that see large common-mode voltage transients at the device inputs. The enhanced PWM rejection circuitry inside the AWS72240 provides minimal signal disturbance at the output due to the common-mode voltage transitions at the input.
The AWS72240 operates from a single 2.7V to 5.5V supply, drawing 2.5mA of supply current. The AWS72240 is available in five gain options: 10V/V, 20V/V, 50V/V, 100V/V, and 200V/V. Multiple gain options allow for optimization between available shunt resistor values and wide output dynamic range requirements.
The AWS72240 is available in Green TSSOP-8L packages. It operates over an ambient temperature range of -40 °C to +125 °C.
