The MAX9922/MAX9923 ultra-precision, high-side current-sense amplifiers feature an ultra-low offset voltage (VOS) of 20µV (max) and laser-trimmed gain accuracy of better than ±0.1%. This combination of low VOS and high gain accuracy allows precise current measurements even at very small sense voltages.
The MAX9922/MAX9923 are capable of both unidirectional and bidirectional operation. For unidirectional operation, connect REF to GND. For bidirectional operation, connect REF to VDD/2.
The MAX9922 has an adjustable gain, which is set with two external resistors. The MAX9923T/MAX9923H/MAX9923F use an internal laser-trimmed resistor to provide a fixed gain of 25V/V, 100V/V, and 250V/V, respectively. All devices operate from a +2.85V to +5.5V single supply, independent of the input common-mode voltage. They draw only 700µA operating supply current and less than 1µA in shutdown.
A +1.9V to +28V current-sense, input common-mode voltage range makes the MAX9922/MAX9923 ideal for current monitoring in applications in which high accuracy, a large common-mode measurement range, and a minimum full-scale VSENSE voltage are critical.
Key Features
20µV (max) VOS Allows VSENSE of
10mV Full Scale for Low-Power Dissipation in
RSENSE
100mV Full Scale for Wide Dynamic Range (5000:1)
±0.25% (max) Full-Scale Gain Accuracy
Bidirectional or Unidirectional ISENSE
Multiple Gains Available
Adjustable (MAX9922)
+25V/V (MAX9923T)
+100V/V (MAX9923H)
+250V/V (MAX9923F)
+1.9V to +28V Input Common-Mode Voltage Independent of VDD
