SI4705-D60-GMR - Silicon Labs

ADC

Si4704/05

DSP

DAC

DAC ROUT

LOUT

AFC

DIGITAL INTERFACE

(Si4705)

GPO

RFGND LNA

FMI

AGC

PGA

RCLK

REG

VDD

2.7–5.5 V

Headphone

Cable

XTAL

OSC

LPI

32.768 kHz

0/90

DOUT

DCLK

DFS

VIO

SCLK

SDIO

CONTROL

INTERFACE

SEN

RSSI

RST

RDS

(Si4705)

Si4704/05

Enhanced Broadcast FM Radio Receiver for Portable Applications

Description

The Si4704/05 enhanced FM receiver is the most

advanced portable solution available today offering

embedded antenna support, digital audio out, worldwide

FM band support, and highly flexible, mature, and proven

FM functionality in a simple API. The Si4704/05

incorporates Silicon Labs' tuned-resonance antenna

technology for crystal clear FM reception in wire-free

device enclosures. Silabs' internationally patented tuned-

resonance technology allows embedded FM antennas

such as PCB traces, loops, stubs, or other devices to

perform exceptionally well, enabling devices with

integrated Bluetooth to receive FM transmissions without

an external FM antenna, and transmit the FM content to

Bluetooth-enabled headsets. This is the best, most cost-

effective solution to enable wire-free FM reception.

The Si4705 also offers digital audio out for FM recording.

Content recorded over the Si4705 can be shared with

friends or played at a later time in MP3 format. The content

can also be tagged with RDS information, allowing song

name and artist labels to be displayed as is done with MP3

meta data. Using the digital audio out, the Si4705 can also

reduce total system power consumption by avoiding

unnecessary ADC/DAC conversions between the FM

receiver and the host processor.

The Si4704/05 truly supports worldwide FM bands, starting

at 64 MHz for Eastern European countries and extending

all the way to 108 MHz for the re st of th e w o rl d. The device

supports channel spacing down to 10 kHz, and includes

advanced, proven seek functionality. All the Silicon Labs

proven FM receiver expertise is incorporated in the Si4704/

05, gained through thousands of designs with almost every

OEM and ODM in the world and over 100 million devices

shipped.

The Si4704/05 leverage Silicon Labs' internationally

patented and proven digital low-IF architecture, offering

proven functionality in a simple and mature API. The

device is offered in a highly reliable, ultra-small

3 x 3 x 0.55 mm 20-pin QFN and is layout compatible with

the full suite of Silicon Labs broadcast offerings including

FM transmit, AM/FM/SW receive, weather band receive

and SAME decode, and unparalleled RDS data receivers.

The complete solution, including a minimal BOM, requires

less than 15 mm2 board area, or less than half that of other

competing solutions. The Si4705 incorporates Silicon Labs'

proven and widely adopted RDS processor, including

worldwide compliance, all symbol decoding, error

detection, error correction, and other RDS functions. The

Si4705 RDS functionality is unmatched in the industry for

performance, on-chip processi ng, and worldwide adoption.

Features

-Worldwide FM band support (64~108 MHz)

-Supports integrated antenna

-Digital low-IF receiver

-Excellent real-world performance

-Frequency synthesizer with integrated VCO

-Seek tuning

-Automatic frequency control (AFC)

-Automatic gain control (AGC)

-Integrated LDO regulator

-Minimal BOM

-Adjustable seek parameters

-Adjustable mono/stereo blend

-Adjustable soft mute

-RDS/RBDS decoder(Si4705 only)

-Optional digital audio output (Si4705 only)

-Programmable de-emphasis(50/75us)

-Programmable reference clock input

-Signal quality measurement

-3 x 3 x 0.55 mm 20-pin Pb-free QFN package

Applications

-Cellular handsets

-MP3 players

-Portable media players

-Personal computers

-Portable navigation devices

-Consumer electronics

Silicon Laboratories and Silicon Labs are trademarks of Silicon Laboratories Inc.

Other products or brandnames mentioned herein are trademarks or registered trademar ks of their respective holders

Si4704/05

Enhanced Broadcast FM Radio Receiver for Portable Applications

Selected Electrical Specifications

Parameter Symbol Test Condition Min Typ Max Unit

Input Frequency fRF 64 —108 MHz

Sensitivity (76–108 MHz) (S+N)/N = 26 dB —1.1 —µV EMF

Input IP3 |f2 – f1| > 1 MHz; f0 = 2 x f1 – f2

AGC disabled —105 —dBµV EMF

Adjacent Channel Selectivity ±200 kHz —50 —dB

Alternate Channel Selectivity ±400 kHz —70 —dB

RCLK Frequency —32.768 —kHz

RCLK Frequency Tolerance –100 —100 ppm

Audio Output Voltage 72 80 90 mVrms

Audio Mono S/N 55 63 —dB

Audio THD —0.1 0.5 %

Supply Voltage VD, VA 2.7 —5.5 V

Interface Supply Voltage VIO 1.5 —3.6 V

Ambient Temperature TA–20 25 85 C

Supply Current IAD —19.2 —mA

Powerdown Current IPD —10 12 µA

Seek/Tune Time — — 80 ms/channel

SCLK Frequency fCLK 3-wire operation — — 2.5 MHz

fSCL 2-wire operation — — 400 kHz

Powerup Time From powerdown — — 110 ms

Pin Assignments

GND

PAD

17181920

67 8 9

GPO2/INT

VIO

DOUT

LOUT

ROUT

GNDRST

LPI

RCLK

SDIO

VDD

FMI

RFGND

GPO3/DCLK

GPO1

DFS

SCLK

SEN

Package Information

Symbol Millimeters Symbol Millimeters

Min Nom Max Min Nom Max

A 0.50 0.55 0.60 f 2.53 BSC

A1 0.00 0.02 0.05 L 0.35 0.40 0.45

b 0.18 0.25 0.30 L1 0.00 — 0.10

c 0.27 0.32 0.37 aaa — — 0.10

D 3.00 BSC bbb — — 0.10

D2 1.60 1.70 1.80 ccc — — 0.08

e 0.50 BSC ddd — — 0.10

E 3.00 BSC eee — — 0.10

E2 1.60 1.70 1.80

Notes:

1. All dimensions are shown in millimeters unless otherwise noted.

2. Dimensioning and tolerancing per ANSI Y14.5M-1994.

Disclaimer

Silicon Laboratories intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers

using or intending to use the Silicon Laboratories products. Characterization data, available modules and peripherals, memory sizes and memory addresses refer to each specific

device, and "Typical" parameters provided can and do vary in different applications. Application examples described herein are for illustrative purposes only. Silicon Laboratories

reserves the right to make changes without further notice and limitation to product information, specifications, and descriptions herein, and does not give warranties as to the accuracy

or completeness of the included information. Silicon Laboratories shall have no liability for the consequences of use of the information supplied herein. This document does not imply

or express copyright licenses granted hereunder to design or fabricate any integrated circuits. The products must not be used within any Life Support System without the specific

written consent of Silicon Laboratories. A "Life Support System" is any product or system intended to support or sustain life and/or health, which, if it fails, can be reasonably expected

to result in significant personal injury or death. Silicon Laboratories products are generally not intended for military applications. Silicon Laboratories products shall under no

circumstances be used in weapons of mass destruction including (but not limited to) nuclear, biological or chemical weapons, or missiles capable of delivering such weapons.

Trademark Information

Silicon Laboratories Inc., Silicon Laboratories, Silicon Labs, SiLabs and the Silicon Labs logo, CMEMS®, EFM, EFM32, EFR, Energy Micro, Energy Micro logo and combinations

thereof, "the world’s most energy friendly microcontrollers", Ember®, EZLink®, EZMac®, EZRadio®, EZRadioPRO®, DSPLL®, ISOmodem ®, Precision32®, ProSLIC®, SiPHY®,

USBXpress® and others are trademarks or registered trademarks of Silicon Laboratories Inc. ARM, CORTEX, Cortex-M3 and THUMB are trademarks or registered trademarks of

ARM Holdings. Keil is a registered trademark of ARM Limited. All other products or brand names mentioned herein are trademarks of their respective holders.

http://www.silabs.com

Silicon Laboratories Inc.

400 West Cesar Chavez

Austin, TX 78701

USA

Smart.

Connected.

Energy-Friendly

Products

www.silabs.com/products Quality

www.silabs.com/quality Support and Community

community.silabs.com