tda7421n STMicroelectronics, tda7421n Datasheet

tda7421n

Manufacturer Part Number

tda7421n

Description

Am/fm Tuner For Car Radio And Hi-fi Applications

Manufacturer

STMicroelectronics

Datasheet

1.TDA7421N.pdf (38 pages)

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DESCRIPTION

The TDA7421N is a high-performance tuner circuit

which integrates AM and FM sections, PLL frequency

sinthesizer and IF counter on a single chip.

Use of BICMOS technology allows the implementa-

tion of tuning functions with a minimum of external

components.Value spread of external components

can be fully compensated by means of on-chip elec-

PIN CONNECTIONS

August 2000

This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

HIGH PERFORMANCE FRONT-END IC FOR

AM/FM RECEIVERS

FULLY INTEGRATED HIGH-SPEED PLL FOR

OPTIMIZED RDS APPLICATIONS

FM MPX/AM AUDIO OUTPUT, 450kHz AM IF

OUTPUT FOR STEREO AM APPLICATIONS

AM DOUBLE CONVERSION ARCHITECTURE

AM/FM STATION DETECTOR AND DIGITAL

IF-COUNTER

SINGLE FREQUENCY REFERENCE FOR

BOTH AM AND FM

FULL ELECTRICAL ADJUSTMENT

AM/FM TUNER FOR CAR RADIO AND HI-FI APPLICATIONS

C-BUS PROGRAMMABLE

FM RF AGC IN

AM MIX1 IN +

FM AGC OUT

AM MIX1 IN -

FM ANT ADJ

FM MIX IN +

FM MIX IN -

FM RF ADJ

OSC GND

OSC VCC

PLL VCC

RF GND

XTAL D

XTAL G

VCO B

VCO E

17 18 19 20 21

59 58 57 56

22 23 24 25 26

trical adjustment controlled by external P.

The FM quality detection circuit, in conjunction with

the digital IF counter, enables the stop-station func-

tion in “seek” mode and MPX mute during reception.

The combination of programmable level detector and

IF counter allows reliable AM stop-station perfor-

mance.

The Automatic Gain Control (AGC) operates on dif-

ferent signal bandwidths in order to optimize sensitiv-

ity and dynamic range.

gains, PLL and counter settings.

53 52 51 50 49

28 29 30 31 32

C-bus controls functions such as AGC, amplifier

ORDERING NUMBER: TDA7421N

D98AU909

FM IF AMP2 OUT

IF1 VCC

FM LIM IN +

FM LIM IN -

IF1 GND

FM BW TC

FM MUTE DRIVE

FM SMETER AM SMETER

FM DET ADJ

FM SD AM SD

AUDIO OUT

FM QUAD+

FM QUAD-

IF2 VCC

AM IF2 IN

AM REF

AM BPF

TQFP64

TDA7421N

PRELIMINARY DATA

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