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The industry's 'first sample-and-infinite-hold voltage reference'?

Posted: 06 Jul 2005 ?? ?Print Version ?Bookmark and Share

Keywords:dallas semiconductor? ds4303? voltage reference?

Designed for closed-loop calibration systemsDallas Semiconductor has rolled out what it touts as the world's first sample-and-infinite-hold voltage reference. According to the press release, the DS4303 replaces a standard voltage reference plus discrete resistor or potentiometer in embedded systems requiring voltage adjustment during factory calibration. Since it is electrically programmable, the product can be used to automate the calibration process, which contributes to improved quality, increased assembly throughput, and lower production costs, said the company.

Designed for use in closed-loop calibration systems, the DS4303 samples a user-applied input voltage and then "locks in" this voltage at its output which, in turn, sets the parameter being calibrated. The system output must then be measured for accuracy and, if necessary, the input voltage can be adjusted and resampled to improve system output accuracy. This procedure can be repeated as many times as necessary.

The DS4303's output can be set to within 300mV of the supply rails with 1mV accuracy when used in a closed-loop calibration system. Once the desired voltage has been locked into the device, the digitized value is permanently stored in on-board nonvolatile memory that will retain the data even when powered down.

The new voltage reference has a 2.4V to 3.6V supply range and a -40C to 85C operating temperature range. A related future product, the DS4305, will provide the same functionality as the new DS4303, but over a 4V to 5.5V supply range with 1.5mV accuracy. Available in a 5-pin SOT23 package, the DS4303 is priced at 35 cents in 10,000-unit quantities.

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