SI4824-DEMO datasheet(11/20 Pages) ETC2

Part #	SI4824-DEMO

Description	BROADCAST MECHANICAL TUNING AM/FM/SW RADIO RECEIVER

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Si4820/24-A10

Rev. 1.0

11

4. Functional Description

Figure 2. Si4820/24-A10 Functional Block Diagram

4.1. Overview

The Si4820/24-A10 is the entry level mechanical-tuned

digital CMOS AM/FM/SW radio receiver IC that

integrates the complete receiver function from antenna

input to audio output. The Si4820/24-A10 extends

Silicon Laboratories multi-band tuner family, and further

increases the ease and attractiveness of design radio

reception to audio devices through small size and board

area, minimum component count, and superior, proven

performance. The Si4820/24-A10 is drop-in replaceable

to the existing Si4831/35 tuner, requires a simple

application circuit, and removes any requirements for

manually tuning components during the manufacturing

process. It is a very simple product to design,

manufacture, and support across multiple product lines.

Leveraging Silicon Laboratories' proven and patented

digital low intermediate frequency (low-IF) receiver

architecture, the Si4820/24-A10 delivers desired RF

performance and interference rejection in AM, FM, and

SW bands. The high integration and complete system

production test simplifies design-in, increases system

quality, and improves manufacturability.

4.2. FM Receiver

The Si4820/24-A10 integrates a low noise amplifier

(LNA) supporting the worldwide FM broadcast band (64

to 109 MHz).

Pre-emphasis and de-emphasis is a technique used by

FM broadcasters to improve the signal-to-noise ratio of

FM receivers by reducing the effects of high frequency

interference and noise. When the FM signal is

transmitted, a pre-emphasis filter is applied to

accentuate the high audio frequencies. All FM receivers

incorporate a de-emphasis filter which attenuates high

frequencies to restore a flat frequency response. Two

time constants are used in various regions. The de-

emphasis time constant can be chosen to be 50 or

75 µs.

Si4830/34

ADC

DSP

DAC

AOUT

AFC

Si4820/24

RFGND

LNA

AMI

AGC

REG

VDD1/2

2.0~3.6V

XTAL

OSC

FMI

0/90

AM

ANT

FM

ANT

CONTROL INTERFACE

TUNE1/2

BAND

XTALI

ADC

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