Si4136/Si4126
ISM RF S
YNTHESIZER
W
ITH
I
NTEGRATED
VCO
S
F
OR
W
IRELESS
C
OMMUNICATIONS
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
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
Ordering Information:
See page 29.
Pin Assignments
Applications
ISM and MMDS band
communications
Wireless LAN and WAN
Dual-band communications
SCLK
SDATA
GND
GND
NC
GND
NC
GND
GND
GND
RFOUT
Si4136-BT/GT
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
SEN
VDDI
IFOUT
GND
IFLB
IFLA
GND
VDDD
GND
XIN
PWDN
AUXOUT
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
Reference
Amplifier
Power
Down
Control
XIN
÷1/÷2
÷
R
RF1
Phase
Detect
RF1
VDDR
PWDN
÷
N
RF1
÷
R
RF2
Phase
Detect
÷
2
RFOUT
Si4136-BM/GM
SDATA
IFOUT
SCLK
VDDI
GND
SEN
GND
SDATA
SCLK
SEN
Serial
Interface
22-bit
Data
Register
RF2
28 27 26 25 24 23 22
GND
GND
÷
N
RF2
÷
R
IF
Phase
Detect
÷
2
IFDIV
IF
IFOUT
IFLA
IFLB
1
2
3
4
5
6
7
8
GND
21
20
19
GND
IFLB
IFLA
GND
VDDD
GND
XIN
AUXOUT
Test
Mux
NC
GND
NC
GND
GND
GND
18
17
16
15
÷
N
IF
9
GND
10 11 12 13 14
AUXOUT
RFOUT
PWDN
VDDR
GND
Patents pending
Rev. 1.4 1/06
Copyright © 2006 by Silicon Laboratories
Si4136/Si4126
SILABS [ SILICON LABORATORIES ]
