SILABS SI4311-DB

S i 4 3 11 - D B
S i 4 3 11 D EMO B OAR D U SER ’ S G UIDE
1. Overview
The Silicon Laboratories Si4311-DEMO board provides a complete FSK radio design with numerous selectable
features that demonstrate the capabilities of the Silicon Laboratories Si4311 FSK receiver. The Si4311-DEMO
board can be configured to receive FSK data from an SMA connector or wirelessly with an onboard printed circuit
board (PCB) antenna. The demodulated output data from the Si4311-DEMO board can be measured via an SMA
connector and/or observed with an LED and/or heard with an audio buzzer. The system is powered by a 9 V
battery or an external 3.3 V power supply.
2. Features

Single chip FSK receiver
 Selectable 315/433.92 MHz carrier frequency
 Selectable data rate, frequency deviation
3. Description
Figures 1 and 2 show the physical layout of the board with key components indicated.
Figure 1. Si4311 DEMO Board Top Side
Rev. 0.3 9/09
Copyright © 2009 by Silicon Laboratories
Si4311-DB
Si4 311 - DB
Figure 2. Si4311 DEMO Board Bottom Side with 9 V Battery
Power Supply Connector
J1: Jumper to select external 3.3 V supply. This is a solderable jumper and should be shorted when used.
J7: External 3.3 V supply connector: +3.3 V with the jumper on the right side and GND on the left side.
J3: 9 V battery supply connector: Power on with the jumper on the right side and power off with the jumper on the
left side.
J8: Jumper used to measure Si4311 current consumption.

Jumper connected (shorted) is normal operation.
 Jumper connected with an ammeter in series to measure current.
D3: Power-on indicator. LED lights up when powered on.
RF Input
J4: SMA connector for an external RF input. Ensure inductor L3 is open to remove the PCB antenna when using
the SMA input.
Demodulated Data Output
J5: SMA connector for demodulated data output.
External Clock Driver
J9/J17: These solder jumpers should be shorted when an external clock driver is used.
J10: External clock connection point.
Automatic Frequency Centering (AFC)
J11: Jumper used to select AFC function.


Logic High (left side connection) to enable AFC.
Logic Low (right side connection) to disable AFC.
Carrier Frequency Selection
J12: Jumper used to select 315 or 433.92 MHz carrier frequency.

Logic High (left side connection) for 315 MHz.
 Logic Low (right side connection) for 433.92 MHz.
2
Rev. 0.3
Si4311-DB
Bit Time Selection
J13/J14: Two jumpers used for bit time selection.
Table 1. Bit Time Selection
J13
J14
Bit Time [µs]
0
0
1000
0
1
500
1
0
200
1
1
100
Frequency Deviation Selection
J15/J16: Two jumpers used for frequency deviation selection.
Table 2. Frequency Deviation Selection
J13
J14
Frequency Deviation [kHz]
0
0
30
0
1
50
1
0
70
1
1
90
Key Components
U4: Si4311 single chip FSK receiver.
X1: 16 MHz crystal.
D1: LED lights up when data output present.
B2: Audio buzzer sounds when data output is present.
Rev. 0.3
3
Si4 311 - DB
4. Schematic
Figure 3. Si4311-DEMO Schematic
4
Rev. 0.3
Si4311-DB
5. PCB Layout
Figure 4. Si4311 PCB Top Layer
Figure 5. Si4311 PCB Bottom Layer
Rev. 0.3
5
Si4 311 - DB
Figure 6. Si4311 PCB Top Silkscreen
Figure 7. Si4311 PCB Bottom Silkscreen
6
Rev. 0.3
Si4311-DB
6. Bill of Materials
Reference
Qty
Package
Value
B1
1
AA_BATTERY
9.0 V
B2
1
BUZZER2
C1,C7
2
CMS0402
22 nF
C2
1
CMS0603
15 pF
C3,C4
2
CMS0603
NC
C5,C9
2
CMS0402
1 µF
C6
1
CMS0402
NC
C8
1
CMS0402
0.1 µF
C10
1
CMS0402
10 nF
C11
1
CMS0603
2.2 µF
C13
1
CMS0402
220 pF
C14
1
CMS0603
TBD
D1,D3
2
CMS0805
LED
D2
1
CMS0805
IN4148
J3
1
DIP SWITCH
J4,J5
2
SMA
J7
1
HEADER2
L1
1
CMS0402
33 nH
L2
1
CMS0402
TBD
L3
1
CMS0402
0R/NC
Q1
1
SOT23
9013
R1
1
CMS0603
0R
R2
1
CMS0402
20 k
R3,R6
2
CMS0402
1 k
R4
1
CMS0402
330R
R5
1
CMS0402
10 k
R7
1
CMS0402
0R
R8
1
CMS0402
39R
R9
1
CMS0603
NC
U1
1
SOT-23-5
LP2985
U2
1
SC33
SAW filter
U3
1
ANT
U4
1
MLP20-3MM
Si4311
X1
1
XTAL_32X25
16 MHz
Rev. 0.3
7
Si4 311 - DB
7. Receiving Data Status
8. References

8
Si4311 Data Sheet
Rev. 0.3
Si4311-DB
NOTES:
Rev. 0.3
9
Si4 311 - DB
CONTACT INFORMATION
Silicon Laboratories Inc.
400 West Cesar Chavez
Austin, TX 78701
Tel: 1+(512) 416-8500
Fax: 1+(512) 416-9669
Toll Free: 1+(877) 444-3032
Please visit the Silicon Labs Technical Support web page:
https://www.silabs.com/support/pages/contacttechnicalsupport.aspx
and register to submit a technical support request.
The information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice.
Silicon Laboratories assumes no responsibility for errors and omissions, and disclaims responsibility for any consequences resulting from
the use of information included herein. Additionally, Silicon Laboratories assumes no responsibility for the functioning of undescribed features
or parameters. Silicon Laboratories reserves the right to make changes without further notice. Silicon Laboratories makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Silicon Laboratories assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. Silicon Laboratories products are not designed, intended, or authorized for use in applications intended to
support or sustain life, or for any other application in which the failure of the Silicon Laboratories product could create a situation where personal injury or death may occur. Should Buyer purchase or use Silicon Laboratories products for any such unintended or unauthorized application, Buyer shall indemnify and hold Silicon Laboratories harmless against all claims and damages.
Silicon Laboratories and Silicon Labs are trademarks of Silicon Laboratories Inc.
Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders.
10
Rev. 0.3
Mouser Electronics
Related Product Links
634-4311-DK1 - Silicon Laboratories 4311-DK1