SI4711-B30-GM【PDF 19/40 页】IC TX FM RADIO 76-108MHZ 20UQFN

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Si4710/11-B30

Rev. 1.1

5. Functional Description

5.1. Overview

Figure 13. Functional Block Diagram

The Si4710/11 is the first 100% CMOS FM radio

transmitter with integrated receive functionality to

measure received signal strength. The device leverages

Silicon Labs highly successful and proven Si4700/01

FM receiver patent family and offers unmatched

integration and performance, allowing FM transmit to be

added to any portable device with a single chip. The

Si4710/11 offers industry-leading size, performance, low

power consumption, flexibility, and ease of use.

The Si4710/11s digital integration reduces the required

external components of traditional offerings, resulting in

a solution requiring only an external inductor and

bypass capacitor, and PCB space of approximately

15 mm

. This increases the device reliability and

simplifies the design and manufacturing for companies

adopting this technology.

The Si4710/11 performs FM modulation in the digital

domain to achieve high fidelity, optimal performance

versus power consumption, and flexibility of design. The

onboard DSP provides modulation adjustment and

audio dynamic range control for optimum sound quality.

The Si4711 supports the European Radio Data System

(RDS) and the US Radio Broadcast Data System

(RBDS) including all the symbol encoding, block

synchronization, and error correction functions. Using

this feature, the Si4711 enables data such as artist

name and song title to be transmitted to an RDS/RBDS

receiver.

The transmit output (TXO) connects directly to the

transmit antenna with only one external inductor to

provide harmonic filtering. The output is programmable

over a 10 dB voltage range in 1 dB steps. The TXO

output pin can also be configured for loop antenna

support. Users are responsible for complying with local

regulations on RF transmission (FCC, ETSI, ARIB,

etc.).

The digital audio interface operates in slave mode and

supports a variety of MSB-first audio data formats

including I

S and left-justified modes. The interface has

three pins: digital data input (DIN), digital frame

synchronization input (DFS), and a digital bit

synchronization input clock (DCLK). The Si4710/11

supports a number of industry-standard sampling rates

including 32, 40, 44.1, and 48 kHz. The digital audio

interface enables low-power operation by eliminating

the need for redundant DACs and ADCs on the audio

baseband processor.

The Si4710/11 includes a low-noise stereo line input

ADC

Si4710/11

DSP

DAC

CONTROL

INTERFACE

GPO

RDS (Si4711)

LDO

VDD

GND

LIN

RIN

TXO

AFC

120 nH

RFGND

2.75.5 V

22 nF

DFS

DIN

DIGITAL

AUDIO

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