May 2006
Rev 1
1/75
75
TDA7540B
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
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 I
2
C-Bus controlled
Description
The TDA7540 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.
Order codes
TQFP80
Part number
Temp range,
C
Package
Packing
TDA7540B
-40 to 85
TQFP80
Tube
www.st.com
Contents
TDA7540B
2/75
Contents
1
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2
Pins description and connection diagrams . . . . . . . . . . . . . . . . . . . . . . 5
2.1
TQFP80 pins connection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2.1
Globals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2.2
FM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2.3
AM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.2.4
Stereodecoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.2.5
PLL section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.1
FM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.1.1
Mixer1, AGC and 1.IF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.1.2
Mixer2, limiter and demodulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.1.3
Quality detection and ISS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.1.4
Soft mute control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.2
AM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.3
Stereodecoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.3.1
Decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.3.2
Functional description of the noise blanker . . . . . . . . . . . . . . . . . . . . . . 29
4.3.3
Functional description of the multipath-detector . . . . . . . . . . . . . . . . . . 30
4.3.4
Quality detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.3.5
AFS control and stereo decoder mute . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.4
PLL and if counter section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4.4.1
PLL frequency synthesizer block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4.4.2
IF counter block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4.5
I
2
C-Bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
TDA7540B
Contents
3/75
4.5.1
Data transition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.5.2
Start condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.5.3
Stop condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.5.4
Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.5.5
Data transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.5.6
Device addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.5.7
Write operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.5.8
Read operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5
Software specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
5.1
Address organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
5.2
Control register function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
5.2.1
Data Byte Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
6
Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
7
Part List (Application and measurment circuit) . . . . . . . . . . . . . . . . . . 70
8
Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
9
Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
10
Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
11
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
TDA7540B
Pins description and connection diagrams
5/75
2
Pins description and connection diagrams
2.1
TQFP80 pins connection diagram
Figure 2.
TQFP80 pins connection (top view)
2.2 Pin
description
1
2
3
5
6
4
7
8
9
10
31
11
32 33 34 35 36
75 74 73 72
70
71
69 68 67 66 65
55
54
53
51
50
52
60
59
58
56
57
AMRFAGCOUT
AMMIX1REF
AMMIX1IN
TEST1
MIX1 OUT1
DEVTC
FMMIX1IN2
GNDRF
FMMIX1IN1
AMPINDR
FMPINDR
XTALG
ISSTC1
ISSTC2
XTALD
SDA
SSTOP
SCL
FSTC
GNDVCC3
LPOUT
VCC3
IF1AMP1IN
IF1REF
IF1AMP1OUT
VCCIF1
AMREFDEMC
IF1AMP2IN
AMDETC
IF1AMP2OUT
AMRFAGCTC
FMM1X2REF
FMM1X2IN
AMIF2REF
AMIF2BPF
MPXOUT
VCCSTEREO
MPXIN
AFS
VREF1
RXIN0AMIF2IN
MPXW
FMREFDEMC
GNDDEM
D05AU1618
26 27 28 29 30
76
GNDIF1
77
IF1AGCIN
78
AMAGC2TC
79
TEST2
80
MIX1OUT2
GNDVCO
FSU
ADJCH
AMST/MP
INLOCK
21 22 23 24 25
49
48
46
45
47
MUTETC
MPTC
QUALYOUT
FSWO
GNDSTEREO
12
13
14
15
16
FMAGCTC
S1
ISSSTATUS
TV1
TV2
64 63 62 61
VCC2
AMMIX2OUT1
AMMIX2OUT2
GNDVCC2
37 38 39 40
VREF2
LPAM
LPFM
LPHC
44
42
41
43
VCC1
R
GNDVCC1
L
17
18
19
20
VCCVCO
VCOE
VCOB
S2
Table 1.
Pin description
Pin No.
Pin Name
Function
1
MIX1OUT1
Mixer Tank 10.7MHz
2
TEST1
Testing I/O Pin
3
DEVTC
Deviation Detector Time Constant
4
AMMIX1IN
AM Mixer1 Input
5
AMMIX1REF
AM Mixer1 Reference
6
AMRFAGCOUT
Output AM RF AGC
7
AMPINDR
AM PIN Diode Driver Output
8
FMPINDR
FM PIN Diode Driver Output
9
FMMIX1IN1
FM Mixer1 Input1
10
GNDRF
RF Ground
11
FMMIX1IN2
FM Mixer1 Input2
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