TDA7421 datasheet(1/38 Pages) STMICROELECTRONICS

Part #	TDA7421

Description	AM/FM TUNER FOR CAR RADIO AND Hi-Fi APPLICATIONS

PDF	38 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 38 page

FRONT-END FOR AM/FM RECEIVERS

UP-CONVERSION ARCHITECTURE FOR AM

HIGH SPEED PLL WITH INLOCK DETECTOR

FOR OPTIMIZED RDS APPLICATIONS

SINGLE FREQUENCY REFERENCE FOR AM/FM

AM/FM STATION DETECTOR

µP-CONTROLLED COMPENSATION OF EX-

TERNAL COMPONENTS SPREAD

ADJUSTABLE AUDIO MUTE

FULLY PROGRAMMABLE BY I

2C BUS

ADVANCED BICMOS TECHNOLOGY

GENERAL DESCRIPTION

The TDA7421 is a high performance tuner circuit

that integrates AM/FM sections, IF counter and

PLL synthesizer on a single chip.

Use of BICMOS technology allows the implemen-

tation of tuning functions with a minimum of exter-

nal components.

Value spread of external components can be fully

compensated by means of on-chip electrical ad-

justment controlled by external

µP.

The Automatic Gain Control (AGC) operates on

different sensitivities and bandwidths in order to

improve sensitivity and dynamic range. I

2C bus

allows to control selected functions of the tuner

(AGC and amplifiers gain, PLL and counters op-

eration modes).

June 1998

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FM AGC OUT

FM RF AGC IN

FM MIX IN +

AM MIX1 IN +

AM MIX1 IN -

FM MIX IN -

XTAL D

OSC GND

VCO E

RF GND

VCO B

FM BW TC

FM MUTE DRIVE

FM SMETER AM SMETER

FM DET ADJ

FM QUAD+

FM SD AM SD

FM IF AMP2 OUT

IF1 VCC

FM LIM IN +

IF1 GND

FM LIM IN -

D96AU546A

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FM QUAD-

IF2 VCC

AM REF

AM BPF

AM IF2 IN

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PLL VCC

FM RF ADJ

FM ANT ADJ

XTAL G

OSC VCC

AUDIO OUT

PINS CONNECTION

TQFP64

ORDERING NUMBER: TDA7421

TDA7421

AM/FM TUNER FOR CAR RADIO

AND Hi-Fi APPLICATIONS

®

1/38

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