Silicon Laboratories SI4734/35-B20 manual Broadcast Am/Fm/Sw/Lw Radio Receiver, Si4734/35-B20

Si4734/35-B20

BROADCAST AM/FM/SW/LW RADIO RECEIVER

Features

„ Worldwide FM band support	„ No manual alignment necessary
(64–108 MHz)	„ Adjustable channel filters
„ Worldwide AM band support	„ EN55020 complaint
(520–1710 kHz)	„ Programmable reference clock
„ SW band support (2.3–21.85 MHz)	„ Digital volume control
„ LW band support (153–279 KHz)	„ Adjustable soft mute control
„ Excellent real-world performance	„ RDS/RBDS processor (Si4735 only)

„Freq synthesizer with integrated VCO „ Optional digital audio out (Si4735 only)

„ Automatic frequency control (AFC)	„ 2-wire and 3-wire control interface
„ Automatic gain control (AGC)	„ 2.7 to 5.5 V supply voltage
„ Integrated LDO regulator	„ Wide range of ferrite loop sticks and air
„ Digital FM stereo decoder	loop antennas supported
„ Programmable de-emphasis	„ 3 x 3 x 0.55 mm 20-pin QFN package
„ Adaptive noise suppression	z Pb-free/RoHS compliant

„AM/FM/SW/LW digital tuning

Ordering Information:

See page 31.

Pin Assignments

Si4734/35-GM

(Top View)

Applications

„ Table and portable radios		„	Cellular handsets
„	Stereos	„	Modules
„	Mini/micro systems	„	Clock radios
„	CD/DVD players	„	Mini HiFi
„	Portable media players	„	Entertainment systems

„Boom boxes

Description

The Si4734/35 is the first digital CMOS AM/FM/SW/LW radio receiver IC that integrates the complete tuner function from antenna input to audio output.

Functional Block Diagram

NC

FMI

RFGND

AMI

RST

1

2

3

4

5

6

SEN

NC	GPO1		GPO2/INT
20	19	18

GND

PAD

7	8	9
SCLK	SDIO	RCLK

GPO3/DCLK	DFS
17	16
	15	DOUT
	14	LOUT
	13	ROUT
	12	GND
10	11	VDD
VIO

	FM / SW			Si4734/35
	ANT
	FMI	LNA		RDS	DIGITAL	DOUT
				(Si4735)
					AUDIO	DFS
		AGC		LOW-IF	(Si4735)	GPO/DCLK
AM / LW	AMI		ADC		DAC	ROUT
ANT		LNA		DSP
	RFGND
		AGC	ADC		DAC	LOUT
2.7 - 5.5 V	VDD			CONTROL
	GND	LDO	AFC			VIO
				INTERFACE
						1.5-3.6V
			RCLK	SEN SCLK	SDIO RST

Patents pending

Notes:

1.To ensure proper operation and receiver performance, follow the guidelines in “AN383: Antenna Selection and Universal Layout Guide.” Silicon Laboratories will evaluate schematics and layouts for qualified customers.

2.Place Si4734/35 as close as possible to antenna jack and keep the FMI and AMI traces as short as possible.

Rev. 1.0 4/08 Copyright © 2008 by Silicon Laboratories Si4734/35-B20