SKYWORKS-SILICON-LABS-SI4685-A10-GM

Si4685-A10  

Single-Chip, AM/FM/DAB/DAB+ Radio Receiver  

Description  

Features  

The Si4685 single-chip digital receiver is one member of a  

family of 100% CMOS digital radio broadcast receiver ICs  

from Silicon Labs. The Si468x family offers a complete and  

cost-effective digital radio solution integrating the RF tuner,  

baseband and audio processing on a single die. The high  

level of integration provides significant customer benefits  

compared to traditional digital radio solutions, including a  

reduction in system implementation complexity, validation  

and testing, and improved reliability and manufacturability.  

–

Worldwide FM band support (76–108 MHz)  

–

Worldwide AM band support (520–1710 kHz)  

–

Advanced RDS/RBDS decoder  

–

DAB, DAB+ Band III support (168–240 MHz)  

–

Supports WorldDMB Receiver Profiles 1 and 2  

–

Integrated OFDM channel demodulator  

–

Integrated de-interleaving SRAM  

–

I

2

S digital audio out with ASRC  

–

Integrated 97 dB stereo audio DAC  

–

Concurrent I

2

S/L-R stereo audio out  

–

Full range of signal quality metrics  

–

Fully-integrated VCO / PLL / synthesizer  

The Si4685 offers VHF Band III (168-240 MHz) reception  

capability and is fully compliant with ETSI EN 300 401 and  

ETSI TS 102 563. The Si4685 supports DAB and DAB+ via  

an integrated source decoder that supports both MPEG  

Audio Layer 2 (DAB) and HE-AAC V2 (DAB+). The Si4685  

supports data services such as Dynamic Labels, Intellitext,  

Electronic Program Guide (EPG), Slideshow and  

Journaline® with the appropriate external decoders.  

–

SPI and I

2

C host control interfaces  

–

QFN 48-pin, 7x7x0.85 mm  

Applications  

–

Clock and tabletop radios  

–

Stereo boomboxes  

–

Mini/micro systems  

–

Docking stations  

The Si4685 additionally supports worldwide AM/FM radio  

reception and incorporates a fully integrated decoder for  

the European Radio Data System (RDS) and the North  

American Radio Broadcast Data System (RDBS) including  

all required symbol decoding, block synchronization, error  

detection, and error correction functions.  

.  

Si4685-A10  

AGC  

LOOPP  

LOOPN  

ADC  

LNA  

DAC  

DAC  

LOUT  

ROUT  

DSP  

RDS  

RFREF  

LNA  

ADC  

VHFI  

AGC  

DCLK  

DFS  

I2S  

DOUT  

VHFSW  

VHF SW  

SCLK  

SSB  

MISO  

MOSI  

CLK  

Gen  

FLASH  

Interface  

LDOs  

Control  

Digital Radio Receiver  

Copyright © 2014 by Silicon Laboratories  

8.11.2014  

Si4685-A10  

Single-Chip, AM/FM/DAB/DAB+ Radio Receiver  

Selected Electrical Specifications  

Parameter  

Ambient

T

e

mperature  

Analog Supply Voltage  

Interface Supply Voltage  

Core Digital Supply Voltage  

Memory Supply Voltage  

Analog FM  

Symbol  

Test Conditions  

Min  

–40  

Typ  

25  

Max  

85  

Units  

°C  

V

T

A

V

1.71  

1.62  

1.62  

1.62  

1.8  

1.8  

1.8  

1.8  

2.0  

3.6  

2.0  

2.0  

A

V

V

IO  

V

V

CORE  

V

V

MEM  

Input Frequency  

F

F

F

76  

—

—

—

108  

60  

MHz  

rf  

rf  

rf  

Seek/Tune Time  

ms/ch  

Analog AM  

Input Frequency  

520  

—

—

—

1710  

60  

kHz  

Seek/Tune Time  

ms/ch  

DAB/DAB+  

Input Frequency  

168  

—

—

240  

—

MHz  

ms  

Ensemble Acquisition Time  

For a valid channel, after power-up RF  

level = –47 dBm  

710  

Si4685-A10-GM  

Dimension  

Min  

0.80  

0.00  

0.18  

Nom  

Max  

A

A1  

b

0.85  

0.02  

0.90  

0.05  

0.30  

0.25  

D

7.00 BSC  

5.30  

D2  

e

5.20  

5.40  

0.50 BSC  

7.00 BSC  

5.30  

E

E2  

L

5.20  

0.30  

5.40  

0.50  

0.40  

aaa  

bbb  

ddd  

eee  

0.15  

0.10  

0.05  

0.08  

Notes:  

1.

All dimensions are shown in millimeters (mm) unless otherwise noted.  

2.

Dimensioning and tolerancing per ASME Y14.5M-1994.  

3.

This drawing conforms to JEDEC Outline MO-220, Variation VKKD-4.  

4.

Recommended card reflow profile is per the JEDEC/IPC J-STD-020 specification for Small Body Components.  

Digital Radio Receiver  

Copyright © 2014 by Silicon Laboratories  

8.11.2014  

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

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

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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  

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

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