Sigma-delta ADC enables extreme accuracy
The AD7400 and AD7401 provide the ideal isolated sigma-delta solution, featuring 12bit linearity and sample rates up to 20Msample/s
They are popular choices for current monitoring, which is used to operate myriad motor control applications. In lifts, pumps, and fans, for example, motor speed is controlled by varying the input signal. The integration of ADI's exclusive iCoupler isolation technology allows for isolated, high-speed datarates with low power.
The ADC inputs are optimised for monitoring current through shunt resistors, while protecting the digital communication lines with a 3.75kV reinforced isolation barrier.
The converter operates from a 5V power supply and accepts a +/-200mV signal range, making it suitable for direct connection to current shunts.
The convertor's offset drift is 5uV/C, half that of competing solutions.
Two versions are available: the AD7400 features an internal clock to minimise external components, and the AD7401 uses an external clock to synchronise multiple convertors.
The AD7400 and AD7401 are available in 16-lead SOIC packages and are priced at $4.00 in 1000-piece quantities.
The product is sampling now with full production expected in late 2004.
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