SI4708 datasheet(9/68 Pages) SILABS

部品番号	SI4708

部品情報	Si470X/1X/2X/3X/4X EVALUATION BOARD TEST PROCEDURE

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9 / 68 page

AN388

Rev. 0.2

9

Figure 3. Si474x FM Tuner Setup

2.1. FM Tuner Testing Measurement Considerations

Several issues must be considered to make accurate measurements.

First, the power combiner and cable losses must be calibrated and factored into each measurement. The loss for

the Mini-Circuit power combiner is approximately 6 dB.

Second, most signal generators display the voltage generated at the input of the device under test (DUT) assuming

an input resistance of 50

. For example, if the signal generator displays V

L = 1 µV (0 dBµV), the generator source

voltage VS is 2 µV (6 dBµV). The load voltage VL is generated from the source voltage VS by the voltage divider

created by the 50

 generator source resistance R

S and the 50  load resistance RL. This distinction is important

only for sensitivity, RDS sensitivity, and IP3, which are specified in µV electromotive force (EMF), where EMF

refers to the source voltage VS. Measurements such as AM suppression, selectivity, and spurious response are

relative and may be referenced using VS or VL. To summarize, the generator displays the voltage at the input of the

DUT. In the case of Si47xx FM tuner, input impedance is high; therefore, to convert the value displayed on the

signal generator to EMF, double the voltage (add 6 dB).

Si47xx

Base board

Si474x

AM/FM Receiver

Daughter board

R&S SML01 Generator 1

Audio

Analyzer

RXS

PC

with USB

port

RCA OUT

USB

J79

USB Cable

RCA Cable

EXT pwr

USB pwr

EXT Jack

SW1

J76

J78

J6

R&S SML01 Generator 2

Agilent

E3646A

Power Supply

1

2

3

4

CH

1

CH

2

Power Connector

1. VMCU

2. VIO

3. VDD

4. GND

Power

Combiner

Digital Audio IN.

J30

Line

SPDIF

OUT

J2

同様の部品番号 - SI4708

メーカー	部品番号	データシート	部品情報
Silicon Laboratories	SI4708	999Kb / 2P	EVALUATION BOARD QUICK-START GUIDE
	SI4708	3Mb / 302P	Si47XX PROGRAMMING GUIDE
	SI4708	1Mb / 14P	Si4708/09 PROGRAMMING GUIDE
	SI4708	1Mb / 8P	Si4708/09 ANTENNA, SCHEMATIC, LAYOUT, AND DESIGN GUIDELINES
	SI4708	997Kb / 3P	Broadcast FM Radio Tuner for Portable Applications

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