GENERAL DESCRIPTION
The LM3814/LM3815 Current Gauges provide easy to use precision current measurement with virtually zero insertion loss (typically 0.004Ω). A Delta Sigma analog to digital converter is incorporated to precisely measure the current and to provide a current averaging function. Current is averaged over 6 msec time periods in order to provide immunity to current spikes. The LM3814 and LM3815 are factory-set in two different current options. The sense range is −1A to +1A or −7A to +7A. The user specifies a particular part number to match the current range for a given application. The sampling interval for these parts is 6ms. If larger sampling interval is desired for better accuracy, please refer to the data sheets for the part numbers LM3812 and LM3813. Key Specifications n Ultra low insertion loss (typically 0.004Ω) n 2V to 5.25V supply range n ± 3.5% accuracy at room temperature (includes accuracy of the internal sense element) (LM3814-1.0, LM3815-1.0) n Low quiescent c...
National Semiconductor
