Si47xx-EVB
Si47XX EVALUATION BOARD USER’S GUIDE
1. Introduction
Thank you for purchasing the Silicon Laboratories, Inc. Si47xx Evaluation Board (EVB). The EVB and associated
software have been designed to speed up the overall development process. We look forward to working with you,
and have posted support articles, answers to frequently asked questions, and application notes at
www.mysilabs.com. Table 1 describes all of the available products and features in the Si47xx family.
Table 1. Product Family Function
Part Number General Description
Si4700 FM Receiver
Si4701 FM Receiver with RDS
Si4702 FM Receiver
Si4703 FM Receiver with RDS
Si4704 FM Receiver
Si4705 FM Receiver with RDS
Si4706 High Performance RDS Receiver
Si4707 WB Receiver with SAME
Si4710 FM Transmitter
Si4711 FM Transmitter with RDS
Si4712 FM Transmitter with RPS
Si4713 FM Transmitter with RDS & RPS
Si4720 FM Transceiver
Si4721 FM Transceiver with RDS
Si4730 AM/FM Receiver
Si4731 AM/FM Receiver with RDS
Si4734 AM/SW/LW/FM Receiver
Si4735 AM/SW/LW/FM Receiver with RDS
Si4736 AM/FM/WB Receiver
Si4737 AM/FM/WB Receiver with RDS
Si4738 FM/WB Receiver
Si4739 FM/WB Receiver with RDS
Si4740 AM/FM Receiver
Si4741 AM/FM Receiver with RDS
Si4742 AM/LW/FM/WB Receiver
Si4743 AM/LW/FM/WB Receiver with RDS
Si4749 High-Performance RDS Receiver
RDS
FM Receiver
FM Transmitter
333
3333
3 333
3 3333
33 333
33 33333
AM Receiver
3
33
3
33
33
33 33
3333
33
33 3 3
333
333 3 3
33 3
33 33 3
33
333 3
33 3
33 3 3 3
33
33
LW
LW
WB Receiver
SW/LW Receiver
33
33
33 3 3
RPS
SAME
Digital Input
Digital Output
Package Size (mm)
AEC-Q100 Qualified
High Performance RDS
33
Embedded FM antenna
4x4
4x4
3x3
3x3
3x3
3x3
3x3
3x3
3x3
3x3
3x3
3x3
3x3
3x3
3x3
3x3
3x3
3x3
3x3
3x3
3x3
3x3
4x4
4x4
4x4
4x4
4x4
Rev. 0.4 3/08 Copyright © 2008 by Silicon Laboratories Si47xx-EVB
Si4706, Si4707, and Si474x are under non-disclosure agreement (NDA). Refer to Si4706/07/4x-EVB User’s Guide for information on these parts.
Si47xx-EVB
TABLE OF CONTENTS
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
2. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.1. Si47xx Baseboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.2. Si47xx Daughtercards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
3. Recommended Hardware Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
3.1. Hardware Setup for FM Transmitter Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
3.2. Hardware Setup for FM or Weather Band Receiver Test . . . . . . . . . . . . . . . . . . . . .27
3.3. Hardware Setup for AM Receiver Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
4. Getting Started—Software Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
5. FM Transmitter GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
5.1. Configuring the Si47xx as an FM Transmitter Using Analog Audio Input . . . . . . . . .30
5.2. Configuring the Si47xx as an FM Transmitter Using Digital Audio with Analog Audio
Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
5.3. Configuring the Si47xx as an FM Transmitter Using Digital Audio with SPDIF Digital
Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
5.4. FM Transmitter Main Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
5.5. FM Transmitter Settings (Analog Mode) Property Window . . . . . . . . . . . . . . . . . . . .35
5.6. FM Transmitter Settings (Digital Mode) Property Window . . . . . . . . . . . . . . . . . . . .37
5.7. CODEC Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
5.8. SPDIF Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
5.9. FM Transmitter Receive Power Scan Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
5.10. FM Transmitter Radio Data Service (RDS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
5.11. FM Transmitter Register Map Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
6. FM Receiver GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
6.1. Configuring the Si47xx as an FM Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
6.2. FM Receiver Main Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
6.3. FM Receiver Settings Property Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
6.4. CODEC and SPDIF Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
6.5. FM Receiver RDS Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
6.6. FM Receiver RDS Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
6.7. FM UI Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
6.8. FM Receiver RSSI/SNR Graph Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
6.9. FM Receiver Register Map Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
7. Weather Band GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
7.1. Configuring the Si4736/37/38/39 as Weather Band Receiver . . . . . . . . . . . . . . . . . .65
7.2. Weather Band Main Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
7.3. Weather Band Settings Property Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
7.4. Weather Band Receiver RSSI/SNR Graph Window . . . . . . . . . . . . . . . . . . . . . . . . .68
7.5. Weather Band Receiver Register Map Window . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
2 Rev. 0.4
Si47xx-EVB
8. AM Receiver GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
8.1. AM Receiver Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
8.2. AM Receiver Main Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
8.3. AM Receiver Property Settings Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72
8.4. AM Receiver RSSI/SNR Graph Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
8.5. AM Receiver Register Map Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76
9. Using the EVB with a 9 V Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
10. Debugging Guidelines for Si47xx EVB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78
11. Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
12. Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87
12.1. Si47xx-EVB Baseboard Rev 1.4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87
12.2. Si471x/2x-EVB Daughtercard Rev 1.4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94
12.3. Si473x-EVB Daughtercard Rev. 1.4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96
12.4. Antenna Card Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .98
13. Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100
13.1. Si47xx-EVB Baseboard Rev 1.4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100
13.2. Si471x/2x-EVB Daughtercard Rev 1.4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .103
13.3. Si473x-EVB Daughtercard Rev 1.4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .106
13.4. Antenna Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .109
Documentation Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .115
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .116
Rev. 0.4 3
Si47xx-EVB
This user's guide contains information related to only the Si47xx EVBs itemized in Table 2. Table 2 serves as a
quick reference guide for the sections of interest for your EVB. Sections 1, 4, 9, and 10 of the document apply to all
EVBs.
Table 2. Quick Reference Guide
Part Description Recommended
GUI Bill of Materials Schematics Layout
HW Setup
Si4704/05
Si4710/11/
12/13
Si4720/21
Si4730/31
Si4734/35
Sections 2.1.,
2.2.1.
Sections 2.1.,
2.2.1.
Sections 2.1.,
2.2.1.
Sections 2.1.,
2.2.2., 2.2.3.,
2.2.4., 2.2.5.
Sections 2.1.,
2.2.2., 2.2.3.,
2.2.4., 2.2.5.
Section 3.2. Section 6. Section 11. Tables
24 and 25
Section 3.1. Section 5. Section 11. Tables
24 and 25
Sections 3.1.
and 3.2.
Sections 3.2.
and 3.3.
Sections 3.2.
and 3.3.
Sections 5.
and 6.
Sections 6.
and 8.
Sections 6.
and 8.
Section 11. Tables
24 and 25
Section 11. Tables
24, 26, 27, 28, 29
Section 11. Tables
24, 26, 30
Sections 12.1.,
12.2.
Sections 12.1.,
12.2.
Sections 12.1.,
12.2.
Sections 12.1.,
12.2.,12.3.,
12.4.1., 12.4.2.
Sections 12.1.,
12.3., 12.4.1.,
12.4.3.
Sections
13.1., 13.2.
Sections
13.1., 13.2.
Sections
13.1., 13.2.
Sections
13.1., 13.2.
Sections
13.1., 13.3.,
13.4.1.,
13.4.3.
Si4736/37
Sections 2.1.,
2.2.2., 2.2.3.,
2.2.4., 2.2.5.
Sections 3.2.
and 3.3.
Sections 6.,
7., and 8.
Section 11. Tables
24, 26, 30
Sections 12.1.,
12.3., 12.4.3.
Sections
13.1., 13.3.,
13.4.1.,
13.4.3.
Si4738/39
Sections 2.1.,
2.2.2., 2.2.3.,
2.2.4., 2.2.5.
Sections 3.2.
and 3.3.
Sections 6.,
and 7.
Section 11. Tables
24, 26, 30
Sections 12.1.,
12.3., 12.4.3.
Sections
13.1., 13.3.,
13.4.1.,
13.4.3.
*Note: Si4706, Si4707, and Si474x are under non-disclosure agreement (NDA). Refer to Si4706/07/4x-EVB User’s Guide for
information on these parts.
There are four different EVB kits within the Si47xx family. Each kit ships with a unique set of components
depending on the Si47xx product.
The Si470x EVB kit ships with the following items:
Si470x FM Receiver customer welcome and evaluation letter
Si47xx Baseboard revision 1.3 or later
Si471x/2x Daughterboard revision 1.2 or later with Si4705
EVB Characterization Report
USB cable
RCA cable
Adapters - BNC plug to RCA jack
9 V battery
Headphones
Si470x CD including:
Data sheet
Development application GUI rev 2.5.4 or later
FM receiver firmware rev 1.0 or later
User's guide
4 Rev. 0.4
Quick start guide
The Si471x EVB kit ships with the following items:
Si471x FM Transmitter customer welcome and evaluation letter
Si47xx Baseboard revision 1.3 or later
Si471x/2x Daughterboard revision 1.2 or later with Si471x
EVB Characterization Report
USB cable
RCA cable
Adapters—BNC plug to RCA jack
9 V battery
Si471x CD including:
Data sheet
Development application GUI rev 2.5.4 or later
FM transmitter firmware rev 1.0 or later
User's guide
Quick start guide
Si47xx-EVB
Rev. 0.4 5
Si47xx-EVB
The Si472x EVB kit ships with the following items:
Si472x FM Transceiver customer welcome and evaluation letter
Si47xx Baseboard revision 1.3 or later
Si471x/2x Daughterboard revision 1.2 or later with Si472x
EVB Characterization Report
USB cable
RCA cable
Adapters - BNC plug to RCA jack
9 V battery
Headphones
Si472x CD including:
Data sheet
Development application GUI rev 2.5.4 or later
FM transmitter firmware rev 2.0 or later
FM receiver firmware rev 1.0 or later
User's guide
Quick start guide
The Si473x EVB kit ships with the following items:
Si473x AM/FM Receiver customer welcome and evaluation letter
Si47xx Baseboard revision 1.3 or later
Si473x Daughterboard revision 1.2 or later
SL4X30MW100T Ferrite Antenna Board revision 1.1 (Si4731 only)
SL5X7X100MW70T Ferrite Antenna Board revision 1.1 (Si4731 only)
SL9X5X4MW7F Airloop Antenna Board revision 1.1 (Si4731 only)
AM/FM/SW Antenna Board revision 1.3 (Si4735 only)
AM/FM/WB Antenna Board revision 1.3 (Si4737/39 only)
USB cable
RCA cable
Adapters - BNC plug to RCA jack
9 V battery
Headphones
Loop antenna (Si4731 only)
Whip antenna (Si4735/7 only)
Si473x CD including:
Data sheet
Development application GUI rev 2.8.6 or later
AM receive firmware revision 1.0 or later
FM receiver firmware revision 1.0 or later
Weather band receiver firmwar e revision 0.A or later (Si4737/39 only)
User's guide
Quick start guide
6 Rev. 0.4
Si47xx-EVB
2. Description
Si47xx EVB consists of a baseboard, a daughtercard with the Si47xx part pre-mounted, and, if applicable, an
antenna card. The baseboard is common and shared among all Si47xx EVBs. The following sections refer to both
the images in the figures and the silkscreen on the Si47xx EVB. Please refer to both when using this guide.
2.1. Si47xx Baseboard
J6
J27
J30
J52
J57
X1
J54
J75
J79 SW1 J78
U22 D1
J74 PB1
Figure 1. Baseboard Connectors, Jumpers, and Devices
Baseboard power connectors/devices:
J79 USB connector (using USB power)
J78 External power connector
J77 Battery connector
J76 Terminal block (TB) power connector
SW1 Switch to select between USB power or Ext power
J61 Jumper: Baseboard power select (3.3 V or TB)
J68 Jumper: Si47xx VIO power select (3.3 V or adjustable voltage via R73 or TB)
J69 Jumper: Si47xx VDD power select (3.3 V or adjustable voltage via R74 or TB)
J61
J68
J69
J76
J77
Rev. 0.4 7
Si47xx-EVB
Baseboard audio I/O connectors:
J6 RCA output
J30 Line output
Baseboard clock connectors/devices:
X1 32.768 kHz crystal oscillator
J52 Solder bump: select internal RCLK from oscillator
J54 Ext RCLK SMA connector input
J57 Jumper: Enable or Disable Int RCLK
Baseboard MCU connectors/devices:
U22 C8051F342 MCU
J79 USB connector to communicate with the MCU
J74 JTAG connector for the MCU
PB1 Push button to reset the MCU
D1 LED to confirm power supply to the MCU
Baseboard to daughterboard connectors:
J27 Si47xx daughtercard connector
J75 Expansion card connector (reserved)
2.1.1. Power Supply Network
J79
USB
J78
EXT
J77
BATT
SW1
1.25–3.9 V
LDO
+3.3 V
(U17)
LDO
(R73)
LDO
1.25–7 V
(R74)
Jumper
J69
Jumper
ADJ
Jumper
J68
+3.3 V
TB
Gnd
Terminal
Block (TB)
J61
ADJ
Vdd
J76
+3.3 V
TB
Vio
Vmcu
+3.3 V
Vm
TB
VIO
VDD
Daughterboard
Si47xx
11
10
VIO
VDD
8 Rev. 0.4
Figure 2. Power Supply Block Diagram
Si47xx-EVB
The Si47xx EVB can be powered using one of the following power supply options:
1. USB power supply via J79
2. External dc (Ext DC) power supply via power jack J78 or battery via J77
3. Three separate power supplies (Vdd, Vio, Vmcu) via terminal block J76
The EVB has three supply rails: Vdd, Vio, and Vmcu. Vdd and Vio are routed directly to the daughterboard to
power the Vdd and Vio pins on the Si47xx chip, while Vmcu is used to power the baseboard.
The external dc power supply and battery should not be connected simultaneously. Refer to Section 9. "Using the
EVB with a 9 V Battery‚" on page 77 for more information.
USB Power Supply & EXT DC Power Supply
Switch SW1 is used to select between the USB power supply and Ext dc power supply.
The USB power supply or the Ext dc power supply can be configured in one of the following two modes:
1. Fixed +3.3 V
2. Adjustable Vdd and Vio
Fixed +3.3V
Only one LDO is used in this mode which outputs a +3.3 V supply to all three rails (Vdd, Vio, and Vmcu). The
jumpers need to be set according to Figure 3 to use the EVB in this configuration. This is the default configuration
on the EVB.
Vio Vdd Vmcu
ADJ
+3.3V
TB
ADJ
J69J68
+3.3V
TB
TB
J61
+3.3V
Figure 3. Default Fixed +3.3 V Jumpers Setting
Terminal Block Power Supply
If the terminal block supplies are used, then jumpers J61, J68, and J69 need to be set according to Figure 4. The
user then needs to connect three different power supp lies for Vdd, Vio, and Vmcu.
Vio Vdd Vmcu
+3.3V
ADJ
TB
J68 J61
ADJ
J69
+3.3V
TB
TB
+3.3V
Figure 4. Terminal Block Jumpers Setting
Rev. 0.4 9
Si47xx-EVB
2.1.2. Microcontroller
TC_BCLK
(reserved for digital Rx )
Jumper
J41
Daughterboard
S_GPO3/DCLK
SD_GPO1
RST~
GPO1
19 18 17
Si47xx
5
6 7 8
SEN~
SCLK
GPO3/
GPO2
SDIO
DCLK
PB1
Reset
J79
USB
JTAG
J74
MCU
C8051F342
MD_GPIO3
MS_GPIO2
MD_GPIO1
Jumper
J65
MD_GP4
MS_RSTB
MS_SENB
MS_SCLK
MS_SDIO
Figure 5. MCU Block Diagram
The Si47xx EVB uses a Silicon Laboratories' C8051F342 microcontroller to control the Si47xx and to provide USB
connectivity from the host PC (via connector J79). The LED D1 illuminates to confirm that power is being properly
supplied to the C8051F342 and firmware has loaded. Push-button PB1 manually reset s the C8051F342. Th e JTAG
connector J74 is used to program the C8051F342 at production time, and is not required thereafter.
10 Rev. 0.4
Si47xx-EVB
2.1.3. Reference Clock
Daughterboard
Jumper
J57
DIS_INT_RCLK
The Si47xx accepts a 32.768 kHz reference clock at the RCLK pin. On the EVB, this clock is provided by a
precision crystal oscillator. The user has the option of not using the onboard oscillator and bringing in the reference
clock from an external source through SMA connector J54.
When the user chooses to provide an external RCLK, jumper J52 has to be set accordingly. The user has the
option to turn off the onboard crystal oscillator by installing jumper J57.
2.1.4. Audio I/O
X1
32.768 kHz
INT RClk
Jumper
INT_RCLK
J52
EXT_RCLK
J54
EXT
RClk
Figure 6. Reference Clock Block Diagram
Si47xx
9
RCLK
EVB In (TX only) 47xx Audio2 47xx Audio1 EVB Out (RX only)
TX: Analog/Digital In TX: Analog In TX: Digital In RX: Analog/Digital Out
J7
RCA In
J19
Line In
(white)
J19
SPDIF In
(white)
Jumper
J5&J13
CODEC IN
LINE
IN
S/PDIF IN
SPDIF
IN
DOUT
DOUT
0
1
Digital Input
Select
To_TX
RX: Digital Out RX: Analog Out
Audio2
Select
1
0
AUDIO2
16
LIN/ DFS2
15
RIN/ DOUT
AUDIO1
LOUT/ DFS1
ROUT/ DIN
14
13
Si47xx
Jumper
J45
AUDIO2
From_RX
(Daughterboard)
To_TX
0
1
AUDIO1
Jumper
J44
Audio1
Select
From_RX
CODEC OUT
LINE
DIN
OUT
S/PDIF OUT
SPDIF
DIN
OUT
RCA Out
0
1
Line Out
(black)
SPDIF Out
(black)
Note: Jumper J44 and J45 are automatically configured in EVB Rev 1.3.
Figure 7. Audio I/O Block Diagram
J6
J30
J30
Rev. 0.4 11
Si47xx-EVB
The EVB supports three different kinds of configurations for the FM transmitter:
Analog In to Analog In
Analog In to Digital In
Digital In to Digital In
Analog In to Analog In: This configuration provides a way for the user to evaluate the analog audio input for FM
transmission.
The input to the EVB is an analog audio provided via the RCA input connector J7 or LINE In connector J19 (white).
Jumpers J5 and J13 are set to RCA input by default. The user has to change this jumper accordingly if LINE In is
being used. Then the analog audio inpu t is routed directly through a switch to the Si47xx Rin/Lin inputs pin 15 and
16 (Audio2).
Analog In to Digital In: This configuration provides a way for the user to evaluate the Si4 7xx digit al audio input for
FM transmission using an analog audio input.
The input to the EVB is an analog audio provided via the RCA input connector J7 or LINE In connector J19 (white).
Jumpers J5 and J13 are set to RCA input by default. The user has to change this jumper accordingly if LINE In is
being used. Then the analog audio input is converted by CODEC U10 to a serial audio digital data before it is
routed to the Si47xx digital audio input DIO and DFS pin 13 and 14 (Audio1). The DCLK input is routed to the
GPO3/DCLK pin 17. Make sure that jumper J41 is set to DCLK to ensure proper operation.
Digital In to Digital In: This configuration provides a way for the user to evaluate the Si47xx digital audio input for
FM transmission using S/PDIF digital audio commonly found in sound cards.
The input to the EVB is a digital S/PDIF data provided via the S/PDIF In connector J19 (white). The digital S/PDIF
input is converted by S/PDIF Translator U9 to a serial audio digital data before it is routed to the Si47xx digital
audio input DIO and DFS pin 13 and 14 (Audio1). The DCLK input is routed to the GPO3/DCLK pin 17. Make sure
that jumper J41 is set to DCLK to ensure proper operation.
The EVB supports analog and digital mode for receiver operation:
Analog Out to Analog Out: This configuration provides a way for the user to evaluate the analog audio output for
receiver operation. The output of the Si47xx is routed to RCA output connector J6 and Line output connector J30.
Digital Out to Digital and Analog Out: This configuration provides a way for the user to evaluate the digital audio
output for FM and AM receive using either S/PDIF digital audio or analog audio through the onboard CODEC. The
Si47xx digital audio out is routed through the S/PDIF translator µ9 to S/PDIF output connector J30 and routed
through the CODEC to RCA output connector J6 and line output connector J30.
Digital and Analog Out: This configuration provides a way for the user to evalua te the analog audio out an d digital
audio using S/PDIF digital audio for FM and AM. The analog output of the Si47xx is routed to RCA output
connector J6 and line output connector J30 and the digital audio out is routed through the S/PDIF translator to S/
PDIF output connector J30.
12 Rev. 0.4
Si47xx-EVB
IMPORTANT: Jumper Settings
Because of the many possibilities available to configure the EVB, ensure that these four jumpers are set
accordingly:
1. J41: GPO3/DCLK setting
2. J44: TX/RX setting for Audio1 I/O (automatically set by the GUI for baseboard 1.3 and later)
3. J45: TX/RX setting for Audio2 I/O (automatically set by the GUI for baseboard 1.3 and later)
4. J5, J13: Analog Audio Source, RCA or Line In
J41: GPO3/DCLK Setting
Upper—DCLK digital audio clock
Lower—GPO3 digital control signal
For configuring the Si47xx digital audio input, make sure that the jumper is set in the Upper position so that the
DCLK signal will be routed to the Si47xx.
J44: TX/RX Setting for Audio1 I/O (automatically set by the GUI for baseboard 1.3 and later)
Upper—Audio1 is set to FM transmit (pin 13 and 14 will be the digital audio input).
Lower—Audio1 is set for FM receive (pin 13 and 14 will be analog/digital audio output).
J45: TX/RX Setting for Audio2 I/O (automatically set by the GUI for baseboard 1.3 and later)
Upper—Audio2 is set to FM transmit (pin 15 and 16 will be the analog/digital audio input).
Lower—Audio2 is set for FM receive (pin 15 and 16 will be the digital audio output).
J5, J13: Analog Audio Source, RCA or Line In
Upper—RCA inputs are used for analog audio source.
Lower—Line inputs are used for analog audio source.
Rev. 0.4 13
Si47xx-EVB
2.2. Si47xx Daughtercards
2.2.1. Si471x/2x Daughtercard
Figure 8. Si471x/2x Daughterboard Connectors and Devices
Daughterboard Connectors and Components:
U1 Si472x FM Transceiver or Si470x FM Receiver or Si471x FM Transmitter
L2 Tuning Inductor
R2 0 Ω resistor to connect FM TX output to 10 cm trace built-in antenna
C8 2 pF capacitor to connect FM TX output to J1 SMA connector
R4 50 Ω termination resistor
J1 SMA connector for FM transmitter output
J2 Header for putting external antenna for FM transmitter
J28 SMA connector for FM receiver input
J29 Headphone jack for FM receiver
14 Rev. 0.4
Si47xx-EVB
Figure 9. Fully Assembled Si471x/2x EVB
Si470x/1x/2x EVBs use Si471x/2x daughtercard with different population options depending on the individual
Si470x/1x/2x part. Please refer to individual Bill of Materials for each board.
2.2.1.1. FM Transmitter
The Si471x/2x (U1) and its bypass capacitors and tuning inductor (L2) are located on the daughtercard. The FM
transmit output can be configured in three different ways:
Built-in antenna
External antenna
RF output
Built-In Antenna
The built-in PCB trace antenna is pre-configured as the default antenna.
External Antenna
To use an external antenna, remove resistor R2. Put the external antenna in the J2 header connector.
RF Output
The FM RF output will be available through the SMA connector J1.
Refer to “AN383: Antenna Selection and Universal Layout Guidelines” for a more complete study of the antenna
interface for the Si471x/2x as an FM transmitter.
Table 3 provides the attenuation factors across the FM band when measuring the output at J1 with a 50 Ω load.
Table 3. FM Band Attenuation Factors
Frequency (MHz) Attenuation (dB)
76 32.13
88 30.91
98 30.00
108 29.20
Rev. 0.4 15
Si47xx-EVB
2.2.1.2. FM Receiver
As an FM receiver, the FM input can be configured in three ways:
Built-in antenna
Headphone antenna
RF input
Built-In Antenna
The built-in PCB trace antenna is available by default.
Headphone Antenna
To use a headphone antenna, connect the headphone to the headphone jack J29 that is on the daughtercard. The
daughtercard also includes a headphone amplifier, which enables the user to listen to the audio output via the
headphone connected to J2 9.
RF Input
To evaluat e t he per form ance of the Si4 70x /2x as an F M receiver, connect the FM generator to the SMA connector
J28. The RF input is connected in parallel with the headphone antenna. To disconnect the RF input to eliminate
possible sources of interference, remove C9.
2.2.2. Si473x Daughtercard
Figure 10. Si473x Daughterboard Connectors and Devices
16 Rev. 0.4
Daughterboard connectors and components:
J1 SMA connector for AM test circuit
J2 Header for antenna interface connection
J24 Headphone jack
J26 SMA connector for FM test circuit
L4 270 nH inductor for FM input
U1 Si473x AM/FM/SW Weather Band Receiver chip
C2 Vdd bypass capacitor
C3 FM test circuit ac coupling capacitor
C8 AM input ac coupling capacitor
C12 FM input ac coupling capacitor
C13 AM test circuit ac coupling capacitor
Si47xx-EVB
Figure 11. Fully Assembled Si473x-EVB (no antenna cards)
Rev. 0.4 17
Si47xx-EVB
Figure 12. Fully Assembled Si473x-EVB with Ferrite Antenna Card
The daughtercard implements the Si473x AM/FM receive solution. The AM interface allows the user the option to
choose between a ferrite loop stick antenna and an airloop antenna. The user can also configure the
daughterboard to use the AM test circuit for Si473x AM character ization. Th e FM interface allows th e user to att ach
a headphone for the antenna interface or use the FM test circuit input for Si473x FM characterization. Individual
SW and weather band antenna cards provide the option of using a whip antenna for reception.
2.2.3. Si473x AM/FM/SW Weather Band Receiver Chip
The Si473x (U1) along with its bypass capacitor is located on the daughterboard. The front-end circuit of the
daughterboard includes antenna interfaces and test circuits for AM and FM reception followed by ac coupling
capacitors going into the AM and FM inputs of the Si473x.
18 Rev. 0.4
2.2.4. Antenna Interfaces
2.2.4.1. AM Antenna Interface
Si47xx-EVB
Figure 13. Antenna Board Options—SL4X30MW100T Ferrite, SL5X7X100MW70T Ferrite, and
SL9X5X4MWTF Airloop
The user has the flexibility of choosing one of the two available antenna options. The user can either decide to use
the airloop antenna or the ferrite loop stick antenna.
Rev. 0.4 19
Si47xx-EVB
2.2.4.1.1. Ferrite Loop Stick Antenna
A ferrite loop stick antenna can be used with the Si473x by connecting the ferrite antenna board as shown in
Figure 14.
J24
Head
Phone
Jack/FM
Antenna
FM Input
Buffers
C12
C3
L4
C13
C8
Daughterboard
2
FM Input
3
RFGND
4
AM Input
Analog
Audio Out
LOUT
ROUT
Si473x
Digital*
Audio Out
GPO3/DCLK
DFS
DOUT
U1
*Note: Si4731/5/7/9 only
with FW 2.0 or higher
14
13
17
16
15
Ferrite Loop
Stick Antenna
Board
J2
J26
SMA IN
SMA IN
FM
Test
Circuit
J1
AM
Test
Circuit
Figure 14. Ferrite Loop Stick Antenna Interface for AM Reception on the Si473x Daughterboard
The Si473x accepts a wide range of ferrite loop sticks from 180 to 600 µH with no manual alignment necessary. To
test a specific ferrite loop stick, install the individual ferrite antenna board.
20 Rev. 0.4
Si47xx-EVB
2.2.4.1.2. Airloop Antenna
An airloop antenna can be used by connecting the airloop antenna board as shown in Figure 15.
J24
Head
Phone
Jack/FM
Antenna
FM Input
Buffers
C12
C3
L4
C13
C8
Daughterboard
2
FM Input
3
RFGND
4
AM Input
Analog
Audio Out
LOUT
ROUT
Si473x
Digital*
Audio Out
GPO3/DCLK
DFS
DOUT
U1
*Note: Si4731/5/7/9 only
with FW 2.0 or higher
14
13
17
16
15
Airloop
Antenna
Airloop Antenna
Board
J2
J26
SMA IN
SMA IN
FM
Test
Circuit
J1
AM
Test
Circuit
Figure 15. Airloop Antenna Interface for AM Reception on the Si473x Daughterboard
The airloop antenna board has a transformer, U1. The purpose of the transformer is to gain up the inductance from
the airloop for proper operation. Using a 1:5 turn ratio inductor, the inductance is increased by 25 times and easily
supports all typical AM airloop antennas, which generally vary between 10 and 20 µH.
Rev. 0.4 21
Si47xx-EVB
2.2.4.2. FM Antenna Interface
J24
Head
Phone
Jack/FM
Antenna
Buffers
FM Input
C12
C3
L4
C13
C8
Daughterboard
2
FM Input
3
RFGND
4
AM Input
Analog
Audio Out
LOUT
ROUT
Si473x
Digital*
Audio Out
GPO3/DCLK
DFS
DOUT
U1
*Note: Si4731/5/7/9 only
with FW 2.0 or higher
14
13
17
16
15
J2
J26
SMA IN
SMA IN
FM
Test
Circuit
J1
AM
Test
Circuit
Figure 16. Headphone Antenna Interface for FM Rece ption on the Si473x Daughterboard
The FM input on the Si473x is a single-ended input and uses the headphone jack with headphones connected to
provide an antenna for FM reception. Please refer to "A N3 83 : Ante nn a Sele ction a nd Un iversa l Layo ut Gu ide lines"
for more information.
22 Rev. 0.4
2.2.4.3. SW and Weather Band Antenna Interface
Figure 17. SW/WB Antenna Card (SW population option shown)
Si47xx-EVB
Figure 18. Fully Assembled Si473x-EVB with SW/WB Antenna Card
The BNC connector, J2, will be used to connect a whip antenna for shortwave, FM, and weather band reception.
For SW reception, switch S1 must be in the SW position . The ferrite bar is used for AM reception, and the switch
S1 must be in the AM position for AM reception.
When using the WB Antenna Card, WB reception is through the whip antenna. For a better listening experience,
plug the headphones to J30 rather than J24.
Note: LW no t supported with SW/WB Antenna Card.
Rev. 0.4 23
Si47xx-EVB
2.2.5. Test Circuit Interfaces
2.2.5.1. AM/LW/SW Test Circuit Interface
J24
Head
Phone
Jack/FM
Antenna
FM Input
Buffers
C12
C3
L4
C13
C8
Daughterboard
2
FM Input
3
RFGND
4
AM Input
Analog
Audio Out
LOUT
ROUT
Si473x
Digital*
Audio Out
GPO3/DCLK
DFS
DOUT
U1
*Note: Si4731/5/7/9 only
with FW 2.0 or higher
14
13
17
16
15
J2
J26
SMA IN
SMA IN
FM
Test
Circuit
J1
AM
Test
Circuit
Figure 19. Test Circuit Interface for the Si473x Daughterboard
The antenna cards must be disconnected during AM test ing with J1. For best sensitivity measurem ents, disconnect
C8 to eliminate possible noise sources.
24 Rev. 0.4
2.2.5.2. FM/Weather Band Test Circuit Interface
J24
Head
Phone
Jack/FM
Antenna
FM Input
Si47xx-EVB
Buffers
C12
C3
L4
C13
C8
Daughterboard
2
FM Input
3
RFGND
4
AM Input
Analog
Audio Out
LOUT
ROUT
Si473x
Digital*
Audio Out
GPO3/DCLK
DFS
DOUT
U1
*Note: Si4731 only with
FW 2.0 or higher
14
13
17
16
15
J2
J26
SMA IN
SMA IN
FM
Test
Circuit
J1
AM
Test
Circuit
Figure 20. FM Test Circuit on the Si473x Daughterboard
The user does not need to do anything to setup the FM test circuit other than to make sure that the headphone is
disconnected. The test circuit is connected in parallel with the headphone antenna. To eliminate possible sources
of interference, remove C12.
Rev. 0.4 25
Si47xx-EVB
3. Recommended Hardware Setup
The Si47xx-EVB can be configured for FM transmit, FM receive, weather band receiver, or AM/SW receive. The
following is a description of how to correctly configure the device for either mode of operation.
3.1. Hardware Setup for FM Transmitter Test
Analyzer
SMA Cable
FM OUT RCA IN
RF
J1
Si471x/2x
Daughterboard
Si47xx
Baseboard
FM IN
J28
J6
RCA OUT
Jumpers
Setting
DCLK
GPIO3
Note: J44 and J45 are
automatically configured in
EVB Rev1.3 and later
J41
TX
RX
J44 J45
USB
EXT pwr
Generator
TX
RX
SW1
Analog
Audio
RCA Cable
J7
J19
J30
J76
S/PDIF
Audio
Generator
Terminal
Block (TB)
J79
USB pwr
J78
EXT Jack
USB Cable
PC
w/ USB
port
Figure 21. Hardware Setup for FM Transmitter Test
1. Connect the USB cable from PC to the EVB USB connector J79. The USB connection will serve as a dual purpose:
supplying the power to the EVB and controlling the EVB.
2. Connect an analog audio generator to the RCA input connector J7 using an RCA cable or connect an SPDIF digital audio
generator to connector J19 using an SPDIF cable.
3. Connect an RF analyzer from the FM output SMA connector J1 using an SMA cable.
26 Rev. 0.4
3.2. Hardware Setup for FM or Weather Band Receiver Test
Si47xx-EVB
RF
Generator
SMA Cable
FM IN
Si47xx
Daughterboard
Si47xx
Baseboard
J28 or J26
RCA Cable
GPIO3
Audio
Analyzer
J6
RCA OUT
Jumpers
Setting
DCLK
Note: J44 and J45 are
automatically configured in
EVB Rev1.3 and later
J41
TX
RX
J44 J45
USB
EXT pwr
TX
RX
SW1
RCA IN
J7
Optical
Cable
J19
S/PDIF
OUT
J30
J76
Terminal
Block (TB)
J79
USB pwr
J78
EXT Jack
USB Cable
PC
w/ USB
port
Figure 22. Hardware Setup for FM/Weather Band Receiver Test
1. Connect the USB cable from PC to the EVB USB connector J79. The USB connection will serve as a dual purpose,
supplying the power to the EVB and controlling the EVB.
2. Connect an audio analyzer from the RCA output connector J6 using an RCA cable.
3. Connect an RF generator to the FM input SMA connector J28 or J26 using an SMA cable.
4. Connect an audio analyzer to the S/PDIF output connector, J30, using an optical cable.
5.
To avoid possible sources of interference, please remove C9 or C12 (depending on the daughtercard). This wi ll
disconnect the headphone circuit from the test circuit.
Rev. 0.4 27
Si47xx-EVB
3.3. Hardware Setup for AM Receiver Test
Audio
Analyzer
RCA Cable
RF
Generator
SMA Cable
J1
Daughterboard
F M IN
J24
Si473x
Si47xx
Baseboard
J28 or J26
RCA OUT
DCLK
GPIO3
automatically configured in
J79
USB Cable
J6
Jump ers
Se ttin g
TX
RX
J44 J45
J41
Note: J44 and J45 are
EVB Rev1.3 and later
USB
EXT pwr
USB pwr
TX
RX
SW1
RCA IN
EXT Jack
J7
Optical
Cable
J19
S/PDIF
OUT
J30
J76
Terminal
Block (TB)
J78
PC
w/ USB
port
Figure 23. Hardware Setup for AM Reception
1. Connect the USB cable from PC to the EVB USB connector, J79. The USB connection will not only allow controlling of the
EVB, but will also provide power to the EVB.
2. Connect either the ferrite antenna or the airloop antenna board. The user also has the option of using the AM test input for
characterization by connecting the AM test input connector J1 to an RF generator source.
3. Connect an audio analyzer to the RCA output (connector J6) using an RCA cable for the analog audio output.
4. Connect an audio analyzer to the S/PDIF output (connector J30) using an optical cable.
5. Or, connect the headphone output to J24 on the daughtercard.
28 Rev. 0.4
Si47xx-EVB
4. Getting Started—Software Installation
The Si47xx Windows GUI (graphical user interface) software is designed for use with the Si47xx evaluation board
(EVB). The GUI software revision number is available under Help
The GUI software development program uses a host machine USB port to communicate with the Si47xx EVB and
is tested for use with Windows XP and Windows 2000.
To install, insert the Silicon Laboratories Si47xx CD into the host machine CD drive and launch Windows Explorer.
Open the CD to explore the contents in a window like the one shown in Figure 24.
→About.
Figure 24. Installation and Setup Screen
Important: Open and read the Readme.doc file at this point. It may contain information that is not captured here,
and which could be very important to the functionality of the EVB or software.
Run the Setup.Exe and follow the instructions on the screen.
Note: If you get this Error message: "This setup requires the .NET Framework version 2.0," then you should install the .NET
Framework that is provided on the CD and re-run the setup. The GUI requires version 2.0; however, multiple versions
such as 1.1, 2.0, and 3.0 can be installed simultaneously.
After installation is finished, an Si47XXGui icon will appear on your desktop. Launch the software by clicking this
icon on the desktop as shown in Figure 2 5.
Figure 25. Launching the GUI
Rev. 0.4 29
Si47xx-EVB
5. FM Transmitter GUI
The first Si47xx window is the Initialization window as shown in Figure 26.
Select the FM transmitter function.
As an FM transmitter, there are three audio input settings available:
Analog Input
Analog to Digital Input
Digital Input
5.1. Configuring the Si47xx as an FM Transmitter Using Analog Audio Input
This mode configures the Si47xx to receive analog audio input at pin 15 and 16 (LIN and RIN). The user has the
ability to provide analog audio from RCA In connector (J7) or Line In (J19). Set jumpers J5 and J13 accordingly.
Figure 26 shows the configuration setting for analog audio input. Select the device, busmode, firmware revision,
and initial part settings and then click Initialize. A new window displaying "Initializing FM Transmitter" will appear.
Figure 26. Configuring the Si47xx to Transmit Analog Input
30 Rev. 0.4
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