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STMicroelectronics Electronic Components Datasheet

TDA7540N Datasheet

AM/FM car radio tuner IC

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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
September 2013
Rev 2
1/76
www.st.com
1


STMicroelectronics Electronic Components Datasheet

TDA7540N Datasheet

AM/FM car radio tuner IC

No Preview Available !

Contents
Contents
TDA7540N
1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2 Pins description and connection diagrams . . . . . . . . . . . . . . . . . . . . . . 8
2.1 LQFP80 pins connection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3.1 Globals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3.2 FM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.3.3 AM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.3.4 Stereodecoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.3.5 PLL Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.1 FM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.1.1
4.1.2
4.1.3
4.1.4
Mixer1, AGC and 1.IF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Mixer2, limiter and demodulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Quality detection and ISS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Soft mute control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.2 AM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.3 Stereodecoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.3.1
4.3.2
4.3.3
Decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Functional description of the noise blanker . . . . . . . . . . . . . . . . . . . . . . 32
Functional description of the multipath-detector . . . . . . . . . . . . . . . . . . 33
4.3.4
4.3.5
Quality detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
AFS control and stereo decoder mute . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.4 PLL and IF counter section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.4.1 PLL frequency synthesizer block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.4.2 IF counter block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.5 I2C-Bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
2/76


Part Number TDA7540N
Description AM/FM car radio tuner IC
Maker STMicroelectronics
Total Page 30 Pages
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