MAX9934TAUA+

The MAX9934TAUA+ is a high precision, low voltage, current-sense amplifier with current output and chip select for multiplexing in 8 pin µMAX package. It is ideal for both bidirectional (charge/discharge) and unidirectional current measurements in battery-powered portable and laptop devices. Its precision input specification allows the use of very small sense voltages (typically ±10mV full-scale) for minimally invasive current sensing. The output of the MAX9934 is a current proportional to input VSENSE and is available in 25μA/mV gain with gain accuracy better than 0.25% (max) at +25°C. A chip select (CS) allows multiplexing of several MAX9934 current outputs to a single microcontroller ADC channel. CS is compatible with 1.8V and 3.3V logic systems. When powered down (VCC = 0), RS+ and RS- draw less than 0.1nA (typ) leakage current to reduce battery load. The MAX9934 is robust and protected from input faults of up to ±6V input differential voltage between RS+ and RS-.

• Supply voltage range is 2.5V to 3.6V
• Operating temperature range from -40°C to 125°C
• Input offset voltage (VOS) is a low 10μV
• Input common mode voltage range from -0.1V to +5.5V
• 120μA (typ) quiescent current
• Current output allows ROUT selection for gain flexibility

Applications

Signal Processing, Portable Devices

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party