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SA1021

FM RADIO RECEIVER FOR PORTABLE SYSTEM

Silan Microelectronics 

SA1021

FM RADIO RECEIVER FOR PORTABLE SYSTEM

DESCRIPTION

The SA1021 integrated radio receiver circuit is for portable radios,

stereo as well as mono, where a minimum of periphery is important in

terms of small dimensions and low cost. It is fully compatible for

applications using the low-voltage micro tuning system (MTS). The IC

has a frequency locked loop (FLL) system with an intermediate

frequency of 76kHz. The selectivity is obtained by active RC filters.

The only function to be tuned is the resonant frequency of the

oscillator.Interstation noise as well as noise from receiving weak

SOP-16-225-1.27

signals is reduced by a correlation mute system.

Special precautions have been taken to meet local oscillator

radiation requirements. Because of the low intermediate frequency,

low pass filtering of the MUX signal is required to avoid noise when

receiving stereo. 50kHz roll-off compensation, needed because of the

ORDERING INFORMATION

low pass characteristic of the FLL, is performed by the integrated LF

amplifier. For mono application this amplifier can be used to directly

drive an earphone. The field-strength detector enables field-strength

dependent channel separation control.

Part No.

SA1021

* Mixer

Package

SOP-16-225-1.27

FEATURES

* RF input stage

* Local oscillator

* Frequency detector

* MTS compatible

* IF amplifier/limiter

* Mute circuit

* Loop amplifier

* LF amplifier for mono earphone

amplifier or MUX filter

* Internal reference circuit

* Field-strength dependent channel separation control facility.

BLOCK DIAGRAM

12 13

11

10

78

RF

OSC

5

AF

MIX

AMP

Buffer

IF Filter

VCO

MUTE

AMP

CLIM

6

Demodulation IF limiter

STAB

14 16

15

21

3

Fig.1 Block diagram

4

9

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

Http: www.silan.com.cn

REV:2.0 2004.07.31

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