Tantalum caps eliminate piezo noise in mobile phones
TAC 0805 2.2µF 25V tantalum capacitors from AVX provide good filtering performance for backlighting control of small LCD displays in mobile phones.
Currently, a 1µF 0805 MLCC capacitor stabilises the output from the LED driver in all mobile phones, and is used for the 1 MHz PWM output to support the LEDs. It is the two secondary frequencies (140 Hz and 1.3 KHz), which occur when the LED goes on/off, that causes piezo noise on the ceramics. At these frequencies, the Multi Layer Chip Ceramics - particularly the higher CV parts - will be worse. However, at 140Hz, all will hum.
TAC 0805 devices have been especially developed for this application to operate at frequencies 1 MHz and below, guaranteeing the user reliable, noise-free operation.
The first models incorporating TAC tantalums are currently in pre-production with a major European cellular phone manufacturer.
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