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V A L U A T I O N
B
O A R D
T
E S T
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R O C E D U R E
1. Introduction
The purpose of this document is to describe the test procedures used in Silicon Laboratories for the Si470x/1x/2x/
3x/4x evaluation boards (EVB). It is also intended to enable customers to exactly replicate Silicon Laboratories’ test
environment so that variances in customers’ and Silicon Laboratories’ measured results can be accurately
compared. This document covers AM, FM, and weather band tests for the Si470x/1x/2x/3x/4x receivers and FM
tests for Si471x/2x transmitters. The pass/fail criteria for each test are provided in the respective data sheets.
The Si470x/1x/2x/3x/4x evaluation boards and software provide a platform to program, test, and operate the
Si470x/1x/2x/3x/4x devices. The system consists of two boards: a baseboard and an RF daughter card. The
baseboard provides all necessary support functions, including a USB-based programming interface, digital/analog
audio input and output connection points, optional external clock input, and the RF reference clock source. In
addition, the baseboard provides an S/PDIF transceiver for converting analog audio input/output to I2S and a
codec for converting analog audio input/output to I2S digital input/output. The RF daughter card changes for each
device. For devices with receive functionality (Si470x/2x/3x), it contains the tuner, connection points for RF input,
and audio amplifier. For devices with transmit functionality, it contains the transmitter, connection points for RF
measurement, a trace antenna, and a connection for an external loop antenna. Refer to the individual-EVB User’s
Guides for detailed explanations of the EVB hardware and software.
Table 1 summarizes the functionality of each device in the family.
Table 1. Product Family Function
General
Part
FM
FM
AM
Number Description Transmit Receiver Receiver
Si4700
Si4701
Si4702
Si4703
Si4704
Si4705
Si4706
Si4707
FM Receiver
FM Receiver
w/ RDS
FM Receiver
FM Receiver
w/ RDS
FM Receiver
FM Receiver
w/ RDS
RDS Only
Receiver
WB
Receiver w/
SAME
FM Receiver
FM Receiver
w/ RDS
SW/LW
Receiver
WB
RDS
Receiver
RPS SAME
Digital
Input or
Output
Si4708
Si4709
1/08
Copyright © 2008 by Silicon Laboratories
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Table 1. Product Family Function
General
Part
FM
FM
AM
Number Description Transmit Receiver Receiver
Si4710
Si4711
FM Trans-
mitter
FM Trans-
mitter w/
RDS
FM Trans-
mitter w/
RPS
FM Trans-
mitter w/
RDS & RPS
FM Trans-
ceiver
FM Trans-
ceiver w/
RDS
AM / FM
Receiver
AM / FM
Receiver w/
RDS
AM / SW /
LW / FM
Receiver
AM / SW /
LW/ FM
Receiver w/
RDS
AM / FM /
WB
Receiver
AM / FM /
WB
Receiver w/
RDS
FM / WB
Receiver
FM / WB
Receiver w/
RDS
SW/LW
Receiver
WB
RDS
Receiver
RPS SAME
Digital
Input or
Output
Si4712
Si4713
Si4720
Si4721
Si4730
Si4731
Si4734
Si4735
Si4736
Si4737
Si4738
Si4739
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Table 1. Product Family Function
General
Part
FM
FM
AM
Number Description Transmit Receiver Receiver
Si4740
Si4741
AM / FM
Receiver
AM / FM
Receiver w/
RDS
AM / FM/
LW/ SW
Receiver
AM / FM/
LW/ SW
Receiver w/
RDS
RDS Only
Receiver
SW/LW
Receiver
WB
RDS
Receiver
RPS SAME
Digital
Input or
Output
Si4742
Si4743
Si4749
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T
ABLE
OF
C
ONTENTS
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
2. FM Tuner Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
2.1. FM Tuner Testing Measurement Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
2.2. FM Tuner Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.3. FM Test Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3. AM/Shortwave/Longwave Tuner Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
3.1. AM Tuner Testing Measurement Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.2. AM/Shortwave/Longwave Tuner Testing Procedures . . . . . . . . . . . . . . . . . . . . . . . . 32
4. Weather Band Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
4.1. Weather Band Test Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5. FM Transmitter Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
5.1. FM Transmit Testing Measurement Considerations . . . . . . . . . . . . . . . . . . . . . . . . . 49
5.2. FM Transmit Testing Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
6. Digital Audio Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
6.1. Digital Audio Output for AM and FM Receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
6.2. Digital Audio Input for FM Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Appendix A—Pre-emphasis and De-emphasis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
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