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Adjust voltage during factory calibration with a sample-and-infinite-hold voltage reference

Dallas — Dallas Semiconductor announced what it claims is the world's first
nonvolatile sample-and-infinite-hold voltage reference for systems requiring voltage adjustment during factory calibration.

The voltage reference (DS4303) replaces a standard voltage reference plus a discrete resistor or potentiometer in embedded systems requiring voltage adjustment during factory calibration.

Because it is electrically programmable, the DS4303 can
be used to automate the calibration process, which contributes to
improved quality, increased assembly throughput, and lower production
costs, the company said. Its inexpensive price and 5-pin SOT23 package make the voltage reference suitable for a wide variety of applications.

The device is intended for use in closed-loop calibration systems. It
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 300 mV of the
supply rails with ±1mV accuracy when used in a closed-loop
calibration system. Once the desired voltage has been locked into the
DS4303, the digitized value is permanently stored in on-board
nonvolatile memory that will retain the data even when powered down.

The DS4303 has a 2.4-V to 3.6-V supply range and a -40°C
to +85°C operating temperature range. A related future
product, the DS4305, will provide the same functionality as the new
DS4303, but over a 4-V to 5.5-V supply range with ±1.5 mV accuracy.

Pricing is 35 cents each in 10,000-piece quantities. Click here for the DS4303 data sheet.

Dallas Semiconductor , 1-800-998-8800, www.DallasSemiconductor.com.

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