Document
STW81102
Multi-band RF frequency synthesizer with integrated VCOs
Feature summary
■ Integer-N Frequency Synthesizer www.DataSheet4U.com ■ 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) – 1000 - 1162.5 MHz (Internal divider by 4)
■ ■ ■ ■
VFQFPN28
Applications
■ ■
Excellent integrated phase noise Fast lock time: 150µs Dual modulus programmable prescaler (16/17 or 19/20) 2 programmable counters to achieve a feedback division ratio from 256 to 65551 (prescaler 16/17) and from 361 to 77836 (prescaler 19/20). Programmable reference frequency divider (10 bits) Phase frequency comparator and charge pump Programmable charge pump current Digital Lock Detector Dual Digital Bus Interface: SPI and I2C bus with 3 bit programmable address (1100A2A1A0) 3.3V Power Supply Power down mode (HW and SW) Small size exposed pad VFQFPN28 package 5x5x1.0mm Process: BICMOS 0.35µm SiGe
2.5G and 3G Cellular Infrastructure Equipment CATV Equipment ■ Instrumentation and Test Equipment ■ Other Wireless Communication Systems
Description
The STMicroelectronics STW81102 is an integrated RF synthesizer with voltage controlled oscillators (VCOs). Showing high performance, high integration, low power, and multi-band performances, STW81102 is a low cost one chip alternative to discrete PLL and VCOs solutions. STW81102 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 centerfrequency calibration over 32 sub-bands) and multiple output options (direct output, divided by 2 or divided by 4) allows to cover from 750MHz to 905MHz and 1000MHz to 1162.5MHz, from 1500MHz to 1810MHz and 2000MHz to 2325MHz, from 3000MHz to 3620MHz and 4000MHz to 4650MHz bands. The STW81102 is designed with STMicroelectronics advanced 0.35µm SiGe process.
■ ■ ■ ■ ■ ■ ■ ■ ■
Order codes
Part number STW81102AT STW81102ATR Temp range, °C -40 to 85 -40 to 85 Package VFQFPN28 VFQFPN28 Packing Tray Tape & Reel
June 2006
Rev 2
1/43
www.st.com 1
Contents
STW81102
Contents
1 Block diagram and pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1 1.2 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2
www.DataSheet4U.com
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1 2.2 2.3 2.4 2.5 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Digital logic levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Phase noise specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3 4
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.1 Circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.1.1 4.1.2 4.1.3 4.1.4 4.1.5 4.1.6 4.1.7 4.1.8 Reference input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Reference divider . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Prescaler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 A and B counters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Phase frequency detector (PFD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Lock detect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Charge pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Voltage controlled oscillators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
VCO Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 VCO Frequency Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 VCO Voltage Amplitude Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
5
I2C bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.1 General features . . . . . . . . . . . . . . .