SI2200 Datasheet, PDF (1/30 Pages) Silicon Laboratories – RF SYNTHESIZER WITH INTEGRATED VCOS INTEGRATED VCOS

Si2200
RF SYNTHESIZER WITH INTEGRATED VCOS
FOR SATELLITE RADIO
Features
! Dual-band RF synthesizers
" RF1: 2300 to 2500 MHz
" RF2: 2025 to 2300 MHz
! IF synthesizer
" 62.5 to 1000 MHz
! Integrated VCOs, loop filters,
varactors, and resonators
Applications
! Satellite Radio
! Minimal external components
required
! Low phase noise
! 5 µA standby current
! 25.7 mA typical supply current
! 2.9 to 3.6 V operation
! 28-lead QFN
" Lead-Free and RoHS Compliant
Description
The Si2200 is a monolithic integrated circuit that performs both IF and RF
synthesis for wireless communications applications. The Si2200 includes
three VCOs, loop filters, reference and VCO dividers, and phase
detectors. Divider and powerdown settings are programmable through a
three-wire serial interface.
Functional Block Diagram
XIN
Reference
Amplifier
÷1/÷2
÷R_RF1
Phase
Detect
PWDN
Power
Down
Control
RF1
÷N_RF1
÷2
SDATA
SCLK
SEN
Serial
Interface
22-bit
Data
Register
÷R_RF2
Phase
Detect
RF2
÷N_RF2
÷2
AUXOUT
Test
Mux
÷R_IF
Phase
Detect
IF
÷N_IF
IFDIV
RFOUT
IFOUT
IFLA
IFLB
Ordering Information:
See page 28.
Pin Assignments
Si2200-GM
28 27 26 25 24 23 22
GND 1
21 GND
GND 2
20 IFLB
NC 3
GND 4
GND
19 IFLA
18 GND
NC 5
17 VDDD
GND 6
16 GND
GND 7
15 XIN
8 9 10 11 12 13 14
Patents pending
Rev. 1.0 5/05
Copyright © 2005 by Silicon Laboratories
Si2200