TDA7540N Datasheet, PDF (1/76 Pages) STMicroelectronics – AM/FM car radio tuner IC with stereo decoder and intelligent selectivity system (ISS)

TDA7540N
AM/FM car radio tuner IC with stereo decoder and
intelligent selectivity system (ISS)
Features
FM-part
■ RF AGC generation by RF and IF detection
■ I/Q mixer for 1st FM IF 10.7MHz with image
rejection
■ Mixer for 2nd IF 450kHz
■ Internal 450KHz bandpass filter with bandwidth
control by ISS
■ Fully integrated FM-demodulator with spike
cancellation
AM-part
■ Wide and narrow AGC generation
■ Mixer for 1st IF 10.7MHz, AM upconversion
■ Mixer for 2nd IF 450kHz, AM downconversion
■ Integrated AM-demodulator
■ AM IF- and audio noise blanking
Stereodecoder
■ PLL with adjustment free, fully integrated VCO
■ Automatic pilot dependent mono/stereo
switching
■ Programmable ROLL-OFF compensation
■ High cut and stereo blend-characteristics
programmable
■ Dedicated RDS-mute
■ Internal noise blanker with several threshold
controls
Table 1. Device summary
Order code
Temp range, °C
TDA7540N
TDA7540NTR
-40 to 85°C
-40 to 85°C
LQFP80
Additional features
■ VCO for world tuning range
■ High performance fast PLL for RDS-System
■ IF counter for FM and AM with search stop
signal
■ Quality detector for level, deviation, adjacent
channel and multipath
■ ISS (intelligent selectivity system) for
cancellation of adjacent channel and noise
influences
■ Adjacent channel mute
■ Fully electronic alignment
■ All functions I²C-Bus controlled
Description
The TDA7540N is a high performance tuner
circuit for AM/FM car radio. It contains mixer, IF
amplifier, demodulator for AM and FM,
stereodecoder, quality detection, ISS filter and
PLL synthesizer with IF counter on a single chip.
Use of BICMOS technology allows the
implementation of several tuning functions and a
minimum of external components.
Package
LQFP80 (14x14x1.4mm)
LQFP80 (14x14x1.4mm)
Packing
Tube
Tape and reel
November 2007
Rev 1
1/76
www.st.com
1