Multi-band RF frequency synthesizer with integrated VCOs

The STMicroelectronics STW81103 is an integrated RF synthesizer with voltage controlled oscillators (VCOs). Showing high performance, high integration, low power, and multi-band performances, STW81103 is a low cost one chip alternative to discrete PLL and VCOs solutions.

STW81103 includes an Integer-N frequency synthesizer and two fully integrated VCOs featuring low phase noise performance and a noise floor of -155dBc/Hz. The combination of wide frequency range VCOs (thanks to center frequency calibration over 32 sub-bands) and multiple output options (direct output, divided by 2 or divided by 4) allows to cover the 625MHz-762.5MHz, the 1087.5MHz-1525MHz, the 2175MHz-3050MHz and the 4350MHz-5000MHz bands.

The STW81103 is designed with STMicroelectronics advanced 0.35µm SiGe process.

Key Features

  • Digital lock detector
  • Programmable charge pump current
  • 3.3V power supply
  • Dual digital bus interface: SPI and I2 C bus (fast mode) with 3 bit programmable address (1100A2 A1 A0 )
  • Small size exposed pad VFQFPN28 package 5mm x 5mm x 1.0mm
  • Power down mode (hardware and software)
  • Process: BICMOS 0.35µm SiGe
  • Programmable reference frequency divider (10 bits)
  • 2 programmable counters to achieve a feedback division ratio from 256 to 65551 (prescaler 16/17) and from 361 to 77836 (prescaler 19/20).
  • Integer-N frequency synthesizer
  • Excellent integrated phase noise
  • Dual differential integrated VCOs with automatic center frequency calibration:2500 - 3050 MHz (direct output)4350 - 5000 MHz (direct output)1250 - 1525 MHz (internal divider by 2)2175 - 2500 MHz (internal divider by 2)625 - 762.5 MHz (internal divider by 4)1087.5 - 1250 MHz (internal divider by 4)
  • Dual modulus programmable prescaler (16/17 or 19/20)
  • Phase frequency comparator and charge pump
  • Fast lock time: 150µs



Description Version Size
DS5385 DS5385: Multi-band RF frequency synthesizer with integrated VCOs 3.2 1 MB
Description Version Size
AN2452 AN2452: STW8110x evaluation board and graphical user interface 3.2 1 MB
AN2491 AN2491: STW8110x hardware component layer API guide 1.2 148 KB
AN2455 AN2455: STWPLLSim phase noise and settling time simulator for STW8110x 2.2 1 MB


Description Version Size
Integrated multi-band RF synthesizers 1.0 1 MB


型号 Package Packing Type Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
STW81103AT VFQFPN2 28 5x5x1.0 Tray Active - - NEC EAR99 PHILIPPINES MORE INFO No availability reported, please contact our Sales office
STW81103ATR VFQFPN2 28 5x5x1.0 Tape And Reel Active - - NEC EAR99 PHILIPPINES MORE INFO No availability reported, please contact our Sales office

(*) 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


型号 Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
STW81103AT ActiveVFQFPN2 28 5x5x1.0IndustrialEcopack2 (**) 0 0
STW81103ATR ActiveVFQFPN2 28 5x5x1.0IndustrialEcopack1 (*) 0 0

(**) 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.