SI4701-B15-GM - Silicon Labs

VIO

CONTROLLER

ADC

Si4700/01

DSP

FILTER

DEMOD

MPX

AUDIO

SCLK

SDIO

CONTROL

INTERFACE

SEN

DAC

DAC ROUT

LOUT

0 / 90 LOW-IF

RSSI

TUNE

GPIO

AMPLIFIER

GPIO

RDS

(Si4701) RST

FMIN

FMIP

AFC

AGC

PGA

RCLK

REG

32.768 kHz

2.7 - 5.5 V

Headphone

Cable

Si4700/01

Broadcast FM Radio Tuner for Portable Applications

Description

The Si4700 is the industry's first FM radio tuner IC to

leverage digital integration and 100% CMOS process

technology, resulting in a completely integrated solution

that requires only one external supply bypass capacitor

and less than 20 mm2 of board space. Offering unmatched

integration, the Si4700 allows FM radio reception to be

added to a variety of portable devices where board space,

performance, low power consumption, and ease of use are

essential.

Leveraging Silicon Laboratories' proven Aero® digital low

intermediate frequency (low-IF) receiver architecture and

frequency synthesizer technology, the Si4700 delivers

superior RF performance and interference rejection. Digital

signal processing is utilized to provide optimum sound

quality with varying reception conditions.

The high integration and complete system production test

simplifies design-in, increases quality, and improves

manufacturing. The Si4700 also uses a streamlined

programming model, which further reduces product

development time. Power management is also simplified

with an integrated regulator allowing direct connection to a

2.7 to 5.5 V battery.

The Si4701 incorporates a digital processor for the

European Radio Data System (RDS) and the US Radio

Broadcast Data System (RBDS) including all required

symbol decoding, block synchronization, error detection,

and error correction functions. Using this feature, the

Si4701 enables data such as station identification and

song name to be displayed to the user.

Features

-Worldwide FM band support (76–108 MHz)

-Digital low-IF receiver

-Frequency synthesizer with integrated VCO

-Seek tuning

-Automatic frequency control (AFC)

-Automatic gain control (AGC)

-Excellent overload immunity

-Signal strength measurement

-Programmable de-emphasis (50/75 µs)

-Adaptive noise suppression

-Volume control

-Line-level analog output

-32.768 kHz reference clock

-RDS/RBDS processor (Si4701 only)

-2-wire and 3-wire control interface

-2.7 to 5.5 V supply voltage

-Integrated LDO regulator allows direct connection

to battery

-4x4 mm 24-pin QFN package

-Lead-free/RoHS compliant

Applications

-Cellular handsets

-MP3 players

-PDAs, Notebook PCs

-Portable radios

-USB FM radio

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

Si4700/01

Broadcast FM Radio Tuner for Portable Applications

Parameter Symbol Test Condition Min Typ Max Unit

Input Frequency fRF 76 —108 MHz

Sensitivity (S+N)/N = 26 dB —2.5 3.5 µV EMF

RDS Sensitivity ∆f = 2 kHz, RDS BLER = 5% —15 —µV EMF

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

AGC disabled

—108 —dBµV

Adjacent Channel Selectivity ±200 kHz 35 50 —dB

Alternate Channel Selectivity ±400 kHz 60 70 —dB

RCLK Frequency —32.768 —kHz

RCLK Frequency Tolerance –200 —200 ppm

Audio Output Voltage 72 80 90 mVrms

Audio Band Limits 0 to –3 dB 30 —15k Hz

Audio S/N 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 —17.6 —mA

Powerdown Current IPD — 4 20 µA

Seek Time — — 60 ms/channel

SCLK Frequency fCLK 3-wire operation 0 — 2.5 MHz

fSCL 2-wire operation 0 — 400 kHz

Powerup Time From powerdown — — 110 ms

Selected Electrical Specifications

Pin Assignments

GND

PAD

21222324

78910

RCLK

GND

LOUT

ROUT

GND

FMIN

SDIO

SCLK

GND

FMIP

RFGND

GPIO1

GND

GPIO2

GND

VIO GPIO3

SEN

RST

Package Information

Symbol Millimeters Symbol Millimeters

Min Nom Max Min Nom Max

A 0.80 0.85 0.90 L 0.30 0.40 0.50

A1 0.00 0.02 0.05 L1 0.03 0.05 0.08

b 0.18 0.25 0.30 aaa — — 0.10

D, E 4.00 BSC bbb — — 0.10

D2, E2 2.20 2.30 2.40 ccc — — 0.08

e 0.50 BSC ddd — — 0.10