STW81101AT

STW81101 Multi-band RF frequency synthesizer with integrated VCOs Features Integer-N frequency synthesizer Dual differential integrated VCOs with automatic center frequency calibration: 3300 - 3900 MHz (direct output) 3800 - 4400 MHz (direct output) 1650 - 1950 MHz (internal divider by 2) 1900 - 2200 MHz (internal divider by 2) 825 - 975 MHz (internal divider by 4) Applications 950 - 1100 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 STW81101 is an (prescaler 19/20). integrated RF synthesizer with voltage controlled Programmable reference frequency divider oscillators (VCOs). Showing high performance, (10 bits) high integration, low power, and multi-band Phase frequency comparator and charge pump performances, STW81101 is a low-cost one-chip alternative to discrete PLL and VCO solutions. Programmable charge pump current The STW81101 includes an integer-N frequency Digital lock detector synthesizer and two fully integrated VCOs 2 Dual digital bus Interface: SPI and I C bus with featuring low phase-noise performance and a a 3-bit programmable address (1100A A A ) 2 1 0 noise floor of -155 dBc/Hz. The combination of 3.3 V power supply wide frequency range VCOs (using center- frequency calibration over 32 sub-bands) and Power down mode (hardware and software) multiple output options (direct output, divided by Small size exposed pad VFQFPN28 package 2, or divided by 4) allows coverage of the 5 x 5 x 1.0 mm 825 MHz-1100 MHz, 1650 MHz-2200 MHz and Process: BICMOS 0.35 m SiGe 3300 MHz-4400 MHz bands. The STW81101 is designed with STMicroelectronics advanced 0.35 m SiGe process. February 2008 Rev 4 1/53 www.st.com 1Contents STW81101 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