ST Life.augmented


Antenna Tuning Circuit
  • active Active

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.

pdf Please read
Errata Sheet
pdf Download

Key Features

  • 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

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DS7059: High voltage BST capacitance controller
4.0 281 KB

Application Notes

Description Version Size
AN4440: RFFE HVDAC control
1.0 1,547 KB

Technical Notes & Articles

Description Version Size
TN1173: Packing information for IPAD™, protection, rectifiers, thyristors and AC Switches
3.1 333 KB

Sample & Buy

Part Number Marketing StatusPackagePacking TypeOperating Temperature (min) Operating Temperature (max) Order From STUnit Price (US$)*
@ 1000
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STHVDAC-303C6NRNDWLCSP 36Tape And Reel-.7No availability reported, please contact our Sales officeEcopack2PDF
STHVDAC-303F6ActiveWLCSP 36Tape And Reel-.966Distributor reported inventory date: 2016-02-29
Distributor NameRegionStockMin. order
STHVDAC-303IC6NRNDWLCSP 36Tape And Reel-.7No availability reported, please contact our Sales officeEcopack2PDF

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.