TDA7421

Features:

*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
*P-CONTROLLED COMPENSATION OF EXTERNAL COMPONENTS SPREAD
*ADJUSTABLE AUDIO MUTE
*FULLY PROGRAMMABLE BY I ² C BUS
*ADVANCED BICMOS TECHNOLOGY


Pinout




Specifications

Symbol	Parameter	Value	Unit
Tamb	Operating Temperature Range	-40 to 85	°C
Tstg	Storage Temperature Range	-55 to +150	°C
VCC	Analog Supply Voltages (PLL, RF, IF1, IF2, OSC)	10.2	V
VDD	Digital Supply Voltage	5.5	V

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 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 P.
The Automatic Gain Control (AGC) operates on different sensitivities and bandwidths in order to improve sensitivity and dynamic range. TDA7421 I ² C bus allows to control selected functions of the tuner (AGC and amplifiers gain, PLL and counters operation modes).