Rev. 0.3 9/09 Copyright © 2009 by Silicon Labo ratories Si4311-DB
Si4311-DB
Si4311 DEMO BOARD USER’S GUIDE
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 indi cated.
Figure 1. Si4311 DEMO Board Top Side
Si4311-DB
2 Rev. 0.3
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.
Si4311-DB
Rev. 0.3 3
Bit Time Selection
J13/J14: Two jumpers used for bit time selection.
Frequency Deviation Selection
J15/J16: Two jumpers used for frequency deviation selection.
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.
Table 1. Bit Time Selection
J13 J14 Bit Time [µs]
0 0 1000
01 500
10 200
11 100
Table 2. Frequency Deviation Selection
J13 J14 Frequency Deviation [kHz]
00 30
01 50
10 70
11 90
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4 Rev. 0.3
4. Schematic
Figure 3. Si4311-DEMO Schematic
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Rev. 0.3 5
5. PCB Layout
Figure 4. Si4311 PCB Top Layer
Figure 5. Si4311 PCB Bottom Layer
Si4311-DB
6 Rev. 0.3
Figure 6. Si4311 PCB Top Silkscreen
Figure 7 . Si4311 PCB Bottom Silkscreen
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Rev. 0.3 7
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
Si4311-DB
8 Rev. 0.3
7. Receiving Data Status
8. References
Si4311 Data Sheet
Si4311-DB
Rev. 0.3 9
NOTES:
Si4311-DB
10 Rev. 0.3
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.
Silicon Laboratories and Silicon Labs are trademarks of Silicon Laboratories Inc.
Other products or brandnames mentioned herein are trademarks or registered trademar ks of their respective holders.
The information in this document is believed to be accurate in all respects at the time of publication but is subject to change with out 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, rep-
resentation 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 conse-
quential 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 per-
sonal injury or death may occur. Should Buyer purchase or use Silicon Laboratories products for any such unintended or unauthorized ap-
plication, Buyer shall indemnify and hold Silicon Laboratories harmless against all claims and damages.
