Silicon Laboratories Si4311-DB User manual

Rev. 0.3 9/09 Copyright © 2009 by Silicon Laboratories Si4311-DB
Si4311-DB
Si4311 DEMO BOARD USER’SGUIDE
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

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

Si4311-DB
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

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Rev. 0.3 9
NOTES:

Si4311-DB
10 Rev. 0.3
CONTACT INFORMATION
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