SI4126 Datasheet, PDF (1/34 Pages) Silicon Laboratories – ISM RF SYNTHESIZER WITH INTEGRATED VCOS FOR WIRELESS COMMUNICATIONS

Si4136/Si4126
ISM RF SYNTHESIZER WITH INTEGRATED VCOS
FOR WIRELESS COMMUNICATIONS
Features
Dual-band RF synthesizers
RF1: 2300 MHz to 2500 MHz
RF2: 2025 MHz to 2300 MHz
IF synthesizer
62.5 MHz to 1000 MHz
Integrated VCOs, loop filters,
varactors, and resonators
Applications
ISM and MMDS band
communications
Wireless LAN and WAN
Minimal external components
required
Low phase noise
5 µA standby current
25.7 mA typical supply current
2.7 V to 3.6 V operation
Packages: 24-pin TSSOP,
28-lead QFN
Lead-free/RoHS-compliant options
available
Dual-band communications
Description
The Si4136 is a monolithic integrated circuit that performs both IF and RF
synthesis for wireless communications applications. The Si4136 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
÷N_RF1
RF1
÷2
SDATA
SCLK
SEN
Serial
Interface
22-bit
Data
Register
÷R_RF2
Phase
Detect
÷N_RF2
RF2
÷2
AUXOUT
Test
Mux
÷R_IF
Phase
Detect
IF
÷N_IF
IFDIV
RFOUT
IFOUT
IFLA
IFLB
Ordering Information:
See page 29.
Pin Assignments
Si4136-BT/GT
SCLK 1
SDATA
2
GND 3
GND 4
NC 5
GND 6
NC 7
GND 8
GND 9
GND 10
RFOUT 11
VDDR 12
24 SEN
23 VDDI
22 IFOUT
21 GND
20 IFLB
19 IFLA
18 GND
17 VDDD
16 GND
15 XIN
14 PWDN
13
AUXOUT
Si4136-BM/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
Rev. 1.4 1/06
Patents pending
Copyright © 2006 by Silicon Laboratories
Si4136/Si4126