MAX9923HEUB+

The MAX9923HEUB+ is an ultra precision high side current sense amplifier in 10 pin µMAX package. This device has ultra low offset voltage (VOS) of 20μV maximum. The combination of low VOS and high gain accuracy allows precise current measurements even at very small sense voltages. The MAX9923 is capable of both unidirectional and bidirectional operation. For unidirectional operation connect REF to GND and for bidirectional operation connect REF to VDD/2. The 1.9V to 28V current sense input common mode voltage range makes the MAX9923 ideal for current monitoring in applications where high accuracy, large common mode measurement range and minimum full scale VSENSE voltage is critical. This current sense amplifier uses spread spectrum auto-zeroing technique that constantly measures and cancels input offset voltage by eliminating drift over time, temperature and effect of 1/f noise. This in conjunction with indirect current feedback technique achieves less than 20μV offset voltage.

• Supply voltage range from 2.85V to 5.5V
• Internal laser trimmed resistor for fixed gain of 100V/V
• Operating temperature range from -40°C to 85°C
• Supply current of 700μA at VDD = 3V and 1μA maximum shutdown current
• Input bias current of 1pA
• Input common mode rejection (CMRR) of 140dB
• -3dB small signal bandwidth of 50KHz
• Slew rate of 0.4V/μs at CLOAD = 100pF
• Power supply rejection ratio (PSRR) of 99dB at 2.85V ≤ VDD ≤ 5.5V
• Gain accuracy of ±0.24% at TA = +25°C and gain nonlinearity of ±0.06%

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Sensing & Instrumentation, Signal Processing, Consumer Electronics, Portable Devices

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