The CSA240 device is a current-sense amplifier with enhanced PWM rejection that can sense drops
across shunt resistors over a wide common-mode
voltage range from –6V to 80V, independent of the
supply voltage. The enhanced PWM rejection
function suppresses large common-mode
transients (ΔV/Δt) in systems that use pulse width
modulation (PWM) signals, such as motor drives
and solenoid control systems. The negative
common-mode voltage allows the device to
operate below ground, accommodating the
flyback period of typical solenoid applications.
The features ensure the accurate current
measurements without large transients and
associated recovery ripple on the output voltage.
This device operates from a single 2.7V to 5.5V
power supply, drawing a typ of 1.4mA of supply
current. Four fixed gains are available: 20V/V,
50V/V and100V/V. The low offset of the zero-drift
architecture enables current sensing with
maximum drops across the shunt as low as 10mV
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, MSOP
and 8-pin SOIC packages. See Table 1 for the order
information.
1. FEATURES
• Enhanced PWM rejection
• Excellent CMRR:
160dB DC CMRR
105dB AC CMRR at 50kHz
• Wide common-mode range: –6V to 80V
• Accuracy:
Gain:
• Gain error: 0.25% (Typ)
• Gain drift: 6 ppm/°C (Typ)
Offset:
• Offset voltage: ±5μV (Typ)
• Offset drift: ±30nV/°C (Typ)
• Available gains:
CSA240L: 20V/V
CSA240M: 50V/V
CSA240N: 100V/V
• Quiescent current: 1.4mA (Typ)
2. APPLICATIONS
• Motor controls
• Solenoid and valve controls
• Power management
• Actuator controls
• Pressure regulators
• Telecom equipment
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