The ST BST capacitance controller STHVDAC-303 is a high voltage digital to analog converter (DAC), specifically designed to control and meet the wide tuning bias voltage requirement of the BST tunable capacitances. It provides 3 independent high voltage outputs, thus having the capability to control 3 different capacitances in parallel. It is fully controlled through a 3-wire serial interface. BST capacitances are tunable capacitances intended for use in mobile phone application, and dedicated to RF tunable applications. These tunable capacitances are controlled through a bias voltage ranging from 0 to 30 V. The implementation of BST tunable capacitance in mobile phones enables significant improvement in terms of radiated performance, making the performance almost insensitive to the external environment.
Dedicated ASIC to control BST tunable capacitances
Operation compliant with cellular systems requirements
Integrated boost converter with 3 programmable outputs (from 0 to 30 V)
Low power consumption
3-wire serial interface (30 or 32 bit SPI)
Available in WLCSP for stand-alone or SiP module integration
RF tunable passive implementation in mobile phones to optimize the radiated performances