E-TDA7421N 查看數據表（PDF） - STMicroelectronics

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E-TDA7421N

AM/FM tuner for car radio and Hi-Fi applications

STMicroelectronics 

TDA7421N

AM/FM tuner for car radio and Hi-Fi applications

Not For New Design

Features

■ High performance front-end IC for AM/FM

receivers

■ Fully integrated high-speed PLL for optimized

RDS applications

■ FM MPX/AM audio output, 450 kHz 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

■ i2c bus programmable

Description

The TDA7421N is a high-performance tuner

circuit which integrates AM and FM sections, PLL

frequency synthesizer and IF counter on a single

chip.

Use of BiCMOS technology allows the

implementation of tuning functions with a

minimum of external components.Value spread of

external components can be fully compensated

by means of on-chip electrical adjustment

controlled by external microprocessor.

LQFP64

The FM quality detection circuit, in conjunction

with the digital IF counter, enables the stop-

station function in “seek” mode and MPX mute

during reception. The combination of

programmable level detector and IF counter

allows reliable AM stop-station performance.

The Automatic Gain Control (AGC) operates on

different signal bandwidths in order to optimize

sensitivity and dynamic range.

I2C-bus controls functions such as AGC, amplifier

gains, PLL and counter settings.

Table 1.

Device summary

Order code

Package

TDA7421N

E-TDA7421N(1)

LQFP64

LQFP64

1. In ECOPACK® package see Section 8: Package information on page 45.

Packing

Tray

Tray

January 2009

Rev 2

This is information on a product still in production but not recommended for new designs.

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