STW81102AT STMicroelectronics

STW81102 Multi-band RF frequency synthesizer with integrated VCOs Features Integer-N frequency synthesizer Dual differential integrated VCOs with automatic center frequency calibration: 3000 - 3620 MHz (direct output) 4000 - 4650 MHz (direct output) 1500 - 1810 MHz (internal divider by 2) 2000 - 2325 MHz (internal divider by 2) 750 - 905 MHz (internal divider by 4) Applications 1000 - 1162.5 MHz (internal divider by 4) 2.5G and 3G cellular infrastructure equipment Excellent integrated phase noise CATV equipment Fast lock time: 150 s Instrumentation and test equipment Dual modulus programmable prescaler (16/17 or 19/20) Other wireless communication systems 2 programmable counters to achieve a feedback division ratio from 256 to 65551 Description (prescaler 16/17) and from 361 to 77836 The STMicroelectronics STW81102 is an (prescaler 19/20). integrated RF synthesizer with voltage controlled Programmable reference frequency divider (10 oscillators (VCOs). Showing high performance, bits) high integration, low power, and multi-band Phase frequency comparator and charge pump performances, the STW81102 is a low-cost one- chip alternative to discrete PLL and VCOs Programmable charge pump current solutions. Digital lock detector 2 The STW81102 includes an Integer-N frequency Dual digital bus Interface: SPI and I C bus with synthesizer and two fully integrated VCOs 3 bit programmable address (1100A A A ) 2 1 0 featuring low phase noise performance and a 3.3V power supply noise floor of -155 dBc/Hz. Power down mode (HW and SW) The combination of wide frequency range VCOs Small size exposed pad VFQFPN28 package (using center-frequency calibration over 32 sub- 5x5x1.0mm bands) and multiple output options (direct output, divided by 2 or divided by 4) allows coverage from Process: BICMOS 0.35 m SiGe 750 MHz to 905 MHz and 1000MHz to 1162.5 MHz, from 1500MHz to 1810 MHz and 2000 MHz to 2325MHz, from 3000 MHz to 3620 MHz and 4000MHz to 4650 MHz bands. The STW81102 is designed with STMicroelectronics advanced 0.35m SiGe process. January 2008 Rev 5 1/53 www.st.com 1Contents STW81102 Contents 1 Block diagram and pin configuration . 6 1.1 Block diagram . 6 1.2 Pin configuration . 7 2 Electrical specifications 9 2.1 Absolute maximum ratings . 9 2.2 Operating conditions . 9 2.3 Digital logic levels . 10 2.4 Electrical specifications 10 2.5 Phase noise specification . 13 3 Typical performance characteristics . 15 4 General description . 18 5 Circuit description 19 5.1 Reference input stage . 19 5.2 Reference divider . 19 5.3 Prescaler . 19 5.4 A and B counters . 20 5.5 Phase frequency detector (PFD) . 21 5.6 Lock detect 21 5.7 Charge pump 21 5.8 Voltage controlled oscillators 23 5.8.1 VCO selection 23 5.8.2 VCO frequency calibration . 23 5.8.3 VCO voltage amplitude control . 24 5.9 Output stage . 25 5.9.1 Output Buffer control mode 25 5.10 External VCO Buffer . 26 2 6I C bus interface . 27 6.1 General features 27 2/53