Silicon Laboratories Si47xx-EVB Series User manual

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
Si47XX EVALUATION BOARD USER’SGUIDE
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
FM Transmitter
FM Receiver
AM Receiver
SW/LW Receiver
WB Receiver
RDS
High Performance RDS
RPS
SAME
Digital Input
Digital Output
Embedded FM antenna
AEC-Q100 Qualified
Package Size (mm)
Si4700 FM Receiver 34x4
Si4701 FM Receiver with RDS 33 4x4
Si4702 FM Receiver 33x3
Si4703 FM Receiver with RDS 33 3x3
Si4704 FM Receiver 33 3x3
Si4705 FM Receiver with RDS 33 33 3x3
Si4706 High Performance RDS Receiver 3333 3x3
Si4707 WB Receiver with SAME 33 3x3
Si4710 FM Transmitter 333 3x3
Si4711 FM Transmitter with RDS 3333 3x3
Si4712 FM Transmitter with RPS 3 333 3x3
Si4713 FM Transmitter with RDS & RPS 3 3333 3x3
Si4720 FM Transceiver 33 333 3x3
Si4721 FM Transceiver with RDS 33 33333 3x3
Si4730 AM/FM Receiver 33 3x3
Si4731 AM/FM Receiver with RDS 33 3 3 3x3
Si4734 AM/SW/LW/FM Receiver 333 3x3
Si4735 AM/SW/LW/FM Receiver with RDS 333 3 3 3x3
Si4736 AM/FM/WB Receiver 33 3 3x3
Si4737 AM/FM/WB Receiver with RDS 33 33 3 3x3
Si4738 FM/WB Receiver 33 3x3
Si4739 FM/WB Receiver with RDS 333 33x3
Si4740 AM/FM Receiver 33 3 4x4
Si4741 AM/FM Receiver with RDS 33 3 3 3 4x4
Si4742 AM/LW/FM/WB Receiver 33LW 33
4x4
Si4743 AM/LW/FM/WB Receiver with RDS 33LW 33 3 3 4x4
Si4749 High-Performance RDS Receiver 33 4x4

Si47xx-EVB
2 Rev. 0.4
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

Si47xx-EVB
Rev. 0.4 3
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

Si47xx-EVB
4 Rev. 0.4
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.
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
Table 2. Quick Reference Guide
Part Description Recommended
HW Setup GUI Bill of Materials Schematics Layout
Si4704/05 Sections 2.1.,
2.2.1. Section 3.2. Section 6. Section 11. Tables 24 and 25 Sections 12.1., 12.2. Sections 13.1., 13.2.
Si4710/11/
12/13 Sections 2.1.,
2.2.1. Section 3.1. Section 5. Section 11. Tables 24 and 25 Sections 12.1., 12.2. Sections 13.1., 13.2.
Si4720/21 Sections 2.1.,
2.2.1. Sections 3.1. and 3.2. Sections 5. and 6. Section 11. Tables 24 and 25 Sections 12.1., 12.2. Sections 13.1., 13.2.
Si4730/31 Sections 2.1.,
2.2.2., 2.2.3.,
2.2.4., 2.2.5.
Sections 3.2.
and 3.3. Sections 6. and 8. Section 11. Tables 24, 26, 27, 28, 29 Sections 12.1., 12.2.,12.3.,
12.4.1., 12.4.2.
Sections
13.1., 13.2.
Si4734/35 Sections 2.1.,
2.2.2., 2.2.3.,
2.2.4., 2.2.5.
Sections 3.2.
and 3.3. Sections 6. and 8. Section 11. Tables 24, 26, 30 Sections 12.1., 12.3., 12.4.1.,
12.4.3.
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.

Si47xx-EVB
Rev. 0.4 5
 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
6 Rev. 0.4
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 firmware revision 0.A or later (Si4737/39 only)
 User's guide
 Quick start guide

Si47xx-EVB
Rev. 0.4 7
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
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)
J79 SW1 J78
J76
J74 PB1
J69
J68
J61
J30
J6
J52
X1
J54
J57
J27
J75
U22 D1 J77

Si47xx-EVB
8 Rev. 0.4
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
Figure 2. Power Supply Block Diagram
SW1
J78
EXT
LDO
1.25–3.9 V
(R73)
LDO
1.25–7 V
(R74)
Jumper
J68
Jumper
J69
Daughterboard
Si47xx
VIO
10 11 VDD
ADJ
TB +3.3 V
LDO
+3.3 V
(U17)
J79
USB
J76
Terminal
Block (TB)
Gnd
Vdd
Vio
Vm
ADJ
+3.3 V
TB
+3.3 V
TB
Vmcu
Jumper
J61
VIO
VDD
J77
BATT

Si47xx-EVB
Rev. 0.4 9
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.
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 supplies for Vdd, Vio, and Vmcu.
Figure 4. Terminal Block Jumpers Setting
J69J68 J61
ADJ
+3.3V
TB
ADJ
+3.3V
TB
+3.3V
TB
Vio Vdd Vmcu
ADJ
+3.3V
TB
+3.3V
TB
ADJ
+3.3V
TB
J69
J68 J61
Vio Vdd Vmcu

Si47xx-EVB
10 Rev. 0.4
2.1.2. Microcontroller
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 resets the C8051F342. The JTAG
connector J74 is used to program the C8051F342 at production time, and is not required thereafter.
MCU
C8051F342
Si47xx
SEN~
6 7 8
5
19 18 17
SCLK
SDIO
GPO1 GPO2
GPO3/
DCLK
RST~
MS_SENB
MS_RSTB
MS_SCLK
MS_SDIO
S_GPO3/DCLK
MS_GPIO2 SD_GPO1
Daughterboard
MD_GPIO3
TC_BCLK
(reserved for digital Rx ) Jumper
J41
MD_GPIO1
MD_GP4
J74
JTAG
PB1
Reset
J79
USB Jumper
J65

Si47xx-EVB
Rev. 0.4 11
2.1.3. Reference Clock
Figure 6. Reference Clock Block Diagram
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
Figure 7. Audio I/O Block Diagram
Daughterboard
Si47xx
RCLK
9
X1
32.768 kHz
INT RClk
Jumper
J52
J54
EXT
RClk
Jumper
J57
DIS_INT_RCLK
INT_RCLK
EXT_RCLK
Note: Jumper J44 and J45 are automatically configured in EVB Rev 1.3.
Jumper
J5&J13
EVB In (TX only) 47xx Audio2 47xx Audio1 EVB Out (RX only)
1
0
0
1
CODEC OUT
DIN LINE
OUT
CODEC IN
LINE
IN DOUT
S/PDIF IN
SPDIF
IN DOUT
S/PDIF OUT
DIN SPDIF
OUT
0
1
0
1
Jumper
J45
TX: Analog/Digital In TX: Analog In TX: Digital In RX: Analog/Digital Out
RX: Digital Out RX: Analog Out
AUDIO2
To_TX
From_RX
AUDIO1
From_RX
To_TX Jumper
J44
RCA In
Line In
(white)
SPDIF In
(white)
RCA Out
Line Out
(black)
SPDIF Out
(black)
Si47xx
(Daughterboard)
LIN/ DFS2
RIN/ DOUT LOUT/ DFS1
ROUT/ DIN 14
13
AUDIO1
AUDIO2
15
16
J7
J19
J19
J6
J30
J30
Audio2
Select Audio1 Select
Digital Input
Select

Si47xx-EVB
12 Rev. 0.4
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 input 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 Si47xx digital 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 evaluate the analog audio out and 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.

Si47xx-EVB
Rev. 0.4 13
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.

Si47xx-EVB
14 Rev. 0.4
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 Ωresistor 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 Ωtermination 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

Si47xx-EVB
Rev. 0.4 15
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 Ωload.
Table 3. FM Band Attenuation Factors
Frequency (MHz) Attenuation (dB)
76 32.13
88 30.91
98 30.00
108 29.20

Si47xx-EVB
16 Rev. 0.4
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 J29.
RF Input
To evaluate the performance of the Si470x/2x as an FM 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

Si47xx-EVB
Rev. 0.4 17
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
Figure 11. Fully Assembled Si473x-EVB (no antenna cards)

Si47xx-EVB
18 Rev. 0.4
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 characterization. The FM interface allows the user to attach
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.

Si47xx-EVB
Rev. 0.4 19
2.2.4. Antenna Interfaces
2.2.4.1. AM Antenna Interface
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.

Si47xx-EVB
20 Rev. 0.4
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.
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.
Si473x
AM Input
RFGND
LOUT
ROUT
Analog
Audio Out
SMA IN AM
Test
Circuit
Daughterboard
J1
Head
Phone
Jack/FM
Antenna
14
13
Buffers
J24
SMA IN FM
Test
Circuit
J26
FM Input
L4
FM Input
2
3
4
C12
C3
C13
U1
J2
Ferrite Loop
Stick Antenna
Board
C8 DFS
DOUT 16
15
GPO3/DCLK 17
Digital*
Audio Out
*Note: Si4731/5/7/9 only
with FW 2.0 or higher