News Release from: Xicor
Edited by the Electronicstalk Editorial Team on 3 June 2003
Programmable capacitor chip tunes circuits onboard
The X90100 digitally programmable capacitor can be used to tune the frequency response of electronic systems up to 400MHz.
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New from Xicor, the X90100 digitally programmable capacitor can be used to tune the frequency response of electronic systems up to 400MHz. The X90100 can be set to 1 of 32 discrete capacitor steps ranging from 7.5 to 14.5pF in 0.20pF increments. Once the desired capacitor value is selected via an up/down interface it is stored in the on-chip EEPROM.
The chip also has an integrated power-on-recall circuit that will restore the preset capacitor position from nonvolatile memory during power up thus eliminating the need of microcontroller initialisation.
This reduces the cost of components and manufacturing.
The X90100 can be used in a variety of resonant tuning circuits where the programmable capacitive element provides a means for post-manufacturing trimming.
Using the X90100 along with common capacitors allow oscillator and filter designs to be achieved with Q-values greater than 50.
The device is targeted at the communications, industrial and consumer markets in applications such as sensors, RF transceivers and various other tuning applications from DC to 400MHz.
Xicor's focus is to reduce the cost of manufacturing post-trim by providing a stand-alone solution that does not require a resident microcontroller onboard to select a desired capacitor value.
These devices allow for a 'set-and-forget' approach by offering a nonvolatile in-circuit-programmable capacitive element that only requires a three-pin interface.
The excellent linearity and power-up recall of the capacitor setting are powerful features allowing exact and permanent circuit adjustment.
Production samples are available in 8-lead MSOPs.
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