TDA7540N

Manufacturer Part NumberTDA7540N
DescriptionIC TUNER AM/FM CAR RADIO 80-LQFP
ManufacturerSTMicroelectronics
TDA7540N datasheet
 


Specifications of TDA7540N

Frequency10.7MHzModulation Or ProtocolAM, FM
ApplicationsAutomotive AudioCurrent - Receiving12mA
Data InterfacePCB, Surface MountAntenna ConnectorPCB, Surface Mount
Voltage - Supply7.7 V ~ 9 VOperating Temperature-40°C ~ 85°C
Package / Case80-LQFPLead Free Status / RoHS StatusLead free / RoHS Compliant
Features-Sensitivity-
Memory Size-Data Rate - Maximum-
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AM/FM car radio tuner IC with stereo decoder and
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
TDA7540N
TDA7540NTR
November 2007
intelligent selectivity system (ISS)
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
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.
Temp range, °C
Package
-40 to 85°C
LQFP80 (14x14x1.4mm)
-40 to 85°C
LQFP80 (14x14x1.4mm)
Rev 1
TDA7540N
LQFP80
2
C-Bus controlled
Packing
Tube
Tape and reel
1/76
www.st.com
1

TDA7540N Summary of contents

  • Page 1

    ... Fully electronic alignment ■ All functions I 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 ...

  • Page 2

    ... PLL Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Mixer1, AGC and 1. Mixer2, limiter and demodulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Quality detection and ISS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Soft mute control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Functional description of the noise blanker . . . . . . . . . . . . . . . . . . . . . . 32 Functional description of the multipath-detector . . . . . . . . . . . . . . . . . . 33 Quality detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 AFS control and stereo decoder mute . . . . . . . . . . . . . . . . . . . . . . . . . . 34 PLL frequency synthesizer block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 IF counter block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 TDA7540N ...

  • Page 3

    ... TDA7540N 5 Software specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 5.1 Address organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 5.2 Control register function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 5.2.1 6 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 7 Part list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 8 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 9 Application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 10 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 11 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 Data byte specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Contents 3/76 ...

  • Page 4

    ... Addr 26 stereodecoder Table 39. Addr 27 stereodecoder Table 40. Addr 28 stereodecoder Table 41. Addr 29 stereodecoder Table 42. Addr 30 stereodecoder Table 43. Addr 31 stereodecoder Table 44. Addr 32 stereodecoder Table 45. Addr 33 test tuner control Table 46. Addr 34 test tuner control Table 47. Addr 35 test tuner control Table 48. Addr 36 test tuner control 4/76 TDA7540N ...

  • Page 5

    ... TDA7540N Table 49. Addr 37 test tuner control Table 50. Addr 38 test stereodecoder control Table 51. Addr39 test FM demodulator spike blanker and stereo decoder . . . . . . . . . . . . . . . . . . . . 63 Table 52. Block diagram quality detection principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 Table 53. Functional mode quality detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 Table 54. Part list (application- and measurment circuit Table 55. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 ...

  • Page 6

    ... Block diagram AM part . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 Figure 13. Block diagram AM IF noise blanker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 Figure 14. Block diagram stereodecoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 Figure 15. Block diagram audio noise blanker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 Figure 16. Block diagram multipath detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 Figure 17. Block diagram AFS function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 Figure 18. Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 Figure 19. LQFP80 (14x14x1.40mm) mechanical data and package dimensions 6/76 PEAK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TDA7540N ...

  • Page 7

    ... TDA7540N 1 Block diagram Figure 1. Block circuit diagram Block diagram 7/76 ...

  • Page 8

    ... Deviation detector time constant AM mixer1 input AM mixer1 reference Output AM RF AGC AM pin diode driver output FM pin diode driver output FM mixer1 input1 VREF1 59 AMIF2IN 58 MPXW 57 GNDDEM 56 FMREFDEMC 55 AMIF2REF 54 AMIF2BPF 53 MPXOUT 52 AFS 51 VCCSTEREO 50 MPXIN 49 MUTETC 48 MPTC 47 GNDSTEREO 46 QUALYOUT 45 FSWO 44 VCC1 GNDVCC1 D06AU1653 Function TDA7540N ...

  • Page 9

    ... TDA7540N Table 2. Pin description (continued) Pin # Pin name 10 GNDRF 11 FMMIX1IN2 ISSSTATUS 15 16 FMAGCTC 17 18 VCOB 19 VCOE 20 VCCVCO 21 GNDVCO 22 23 ADJCH 24 AMST/MP 25 STEREO 26 XTALG 27 ISSTC1 28 ISSTC2 29 XTALD 30 SSTOP FSTC 34 GNDVCC3 35 LPOUT 36 VCC3 37 VREF2 38 LPAM 39 LPFM 40 LPHC 41 GNDVCC1 VCC1 45 FSWO 46 Qualyout Pins description and connection diagrams ...

  • Page 10

    ... AM RF AGC time constant IF1 amplifier2 output AM detector capacitor AM demodulator reference IF1 amplifier2 input IF1 supply IF1 amplifier1 output IF1 amplifier reference IF1 amplifier1 input IF1 ground IF1 AGC input AM AGC2 time constant Testing I/O pin Mixer tank 10.7MHz TDA7540N Function ...

  • Page 11

    ... TDA7540N 3 Electrical specifications 3.1 Absolute maximum ratings Table 3. Absolute maximum ratings Symbol V Supply voltage S T Ambient temperature amb T Storage temperature stg 3.2 Thermal data Table 4. Thermal data Symbol R Thermal resistance junction to ambient th(j-amb) 3.3 Electrical characteristics 3.3.1 Globals Table 5. Globals electrical characteristics (T = 25° ...

  • Page 12

    ... CCST CCVCO = 1kHz 10.25MHz, in application circuit, unless MOD Xtal Test conditions 2.5V 16 KAGC = off 0mV 9-11 KAGC = off 0mV 9-11 KAGC = max 0mV 9-11 RMS, Δf =300KHz IF TDA7540N = CCMIX1 CCMIX2 CCIF1 Min. Typ. Max 8.5 7 8.5 5 6.5 12 13.5 4.8 5 5.2 2 ...

  • Page 13

    ... TDA7540N Table 6. FM section electrical characteristics (continued 25°C, V amb CC1 f = 98MHz, dev= 40kHz otherwise specified). Symbol Parameter V Startpoint KAGC 22 Δ Control range KAGC R Input resistance IN C Input capacitance IN AGC time constant output V Max. AGC output voltage 16 V Min. AGC output voltage ...

  • Page 14

    ... Dev.= 75kHz DEM, MENA=1 DEM, MENA=1 Dev.= 40kHz,V = 10mV 65 Dev.= 75kHz S-meter, unweighted fieldstrength V = 20dBµ 80dBµV, SMSL = 0 65 SMSL = 0 SMSL = 1 SL, SMSL=1 TDA7540N = CCMIX1 CCMIX2 CCIF1 Min. Typ. Max. 260 330 400 260 330 400 105 126 260 ...

  • Page 15

    ... TDA7540N Table 6. FM section electrical characteristics (continued 25°C, V amb CC1 f = 98MHz, dev= 40kHz otherwise specified). Symbol Parameter G Gain minimum min G Gain maximum max f -3dB frequency highpass HP f Centre frequency BP f Attenuation 20dB -20dB V Output voltage low 23 V Output voltage high 23 R Output resistance ...

  • Page 16

    ... TISS, ISSCTL = 1 TISS, ISSCTL = 1 TISS, ISSCTL = 0 TISS, ISSCTL = 0 ISSCTL = 0 ISSCTL = 1 ISS filter switch threshold ISSCTL = 0 ISSCTL = 0 ISSCTL = 0 ISSCTL = 0 TDEV TDEV TDEV TDEV DWTH DWTH DTH DTH TDA7540N = CCMIX1 CCMIX2 CCIF1 Min. Typ. Max. 0 0.24 0.3 0.36 0.2 0.25 0.3 0.76 0.95 1 ...

  • Page 17

    ... TDA7540N Table 6. FM section electrical characteristics (continued 25°C, V amb CC1 f = 98MHz, dev= 40kHz otherwise specified). Symbol Parameter Softmute V Upper startpoint ANT V lower startpoint ANT a Min. softmute depth SMmin a Max. softmute depth SMmax Mute depth threshold for ISS a SMTHISS filter on V Internal AC mute threshold ...

  • Page 18

    ... MOD Xtal Test conditions V = 60dBµV, m=off INRF WAGC WAGC DAGC seek seek/seek off differential differential differential referred to diff. mixer input IF1T IF1T IF1T referred to diff. mixer input TDA7540N = CCMIX1 CCMIX2 CCIF1 Min. Typ. Max. 190 97 109 96.5 109 100 120 30 3 ...

  • Page 19

    ... TDA7540N Table 7. AM section electrical characteristics (continued 25°C, V amb CC1 f = 98MHz otherwise specified). Symbol Parameter A Max. gain ΔA Gain control range C Min. cap step min C Max. cap max C 62-63 IF noise blanking t Min. blanking time bl t Max. blanking time bl V Min internal threshold ...

  • Page 20

    ... V >> V LEVEL HCH DEEMP = 0, DESFT = 1 V << V LEVEL HCL DEEMP= 1, DESFT = 1 V << V LEVEL HCL DEEMP = 0, DESFT = 1 AMCF DEEMP = 0, DESFT = 1 AMCF TDA7540N = CCMIX1 CCMIX2 CCIF1 = 10.25MHz, in application Xtal Min. Typ. Max. 3.1 3.3 3.5 25 2.2 2.4 2.6 0.6 0.8 1.0 ...

  • Page 21

    ... TDA7540N Table 8. Stereodecoder electrical characteristics (continued 25°C, V amb CC1 V = 500mV MPX rms circuit, unless otherwise specified). Symbol Parameter VSBL Min. voltage for mono min VSBL Max. voltage for mono max VSBL Step resolution step VHCH Min. voltage for no highcut min VHCH Max ...

  • Page 22

    ... NBRR=11, NBSMP=0, MPPC=0 Signal PEAK in testmode, V =1V, NBSMP=0, MPTC MPPC=1, NBRR=01 Signal PEAK in testmode, V =1V,, NBSMP=1, MPTC MPPC=0, NBRR=01 Signal PEAK in testmode, V =1V,, NBSMP=1, MPTC MPPC=1A, NBRR=01 TDA7540N = CCMIX1 CCMIX2 CCIF1 = 10.25MHz, in application Xtal Min. Typ. Max. 0.5 0.8 1.0 1.6 1.9 2 ...

  • Page 23

    ... TDA7540N Table 8. Stereodecoder electrical characteristics (continued 25°C, V amb CC1 V = 500mV MPX rms circuit, unless otherwise specified). Symbol Parameter G AM delay filter attenuation AMdelay Multipath detector Center frequency of multipath- f CMP bandpass G Min. band pass gain BPMP G Max. band pass gain BPMP G Min. rectifier gain ...

  • Page 24

    ... Min. Trig. T hreshold 0 PEAK [ 2.0 1.5 1.0 0.8 20 32.5 45 MONO STEREO ≈ 3V NOISE ATC_SB OFF (11) noisy signal 1200 mV (00) 950 mV (01) 700 mV (10) 450 mV (11) Noise Controlled Trig. Threshold V 1.5 V Peak Detector off DEVIATION [KHz] 75 2.0V (00) 1.6V (01) 1.4V (10) 0.8V good signal TDA7540N E' ...

  • Page 25

    ... TDA7540N 3.3.5 PLL Section Table 9. PLL electrical characteristics (T = 25°C, V amb CC1 f = 98MHz, dev. = 40kHz otherwise specified). Symbol Parameter Output of tuning voltages (TV1,TV2) V Output voltage OUT R Output impedance OUT R Output impedance OUT Xtal reference oscillator f Reference frequency LO C Min. cap step ...

  • Page 26

    ... Switching outputs S1, S2 (Open emitter SMODE=0) V Output voltage low V Output voltage high I Output current, sink 26/ CC2 CC3 CCST CCVCO = 1kHz 10.25MHz, in application circuit, unless MOD Xtal Test conditions 0.5V 0μ 1mA TDA7540N = CCMIX1 CCMIX2 CCIF1 Min. Typ. Max. V CC1 -0.5 0.5 7 0.1 0 CC1 7 = 8.5V, Unit V μ ...

  • Page 27

    ... TDA7540N 4 Functional description 4.1 FM section 4.1.1 Mixer1, AGC and 1.IF FM quadrature I/Q-mixer converts IF1 of 10.7MHz. The mixer provides inherent image rejection and wide dynamic range with low noise and large input signal performance. The mixer1 tank can be adjusted by software (IF1T). For accurate image rejection the ...

  • Page 28

    ... MPX output with the same time constant for softmute. This value is compared with comparator5 thresholds (ACM). For present strong adjacent channel the MPX signal is additional attenuated (ACMD). 28/76 Table 52. TDA7540N 2 C Bus. This level 2 C Bus ...

  • Page 29

    ... Stereodecoder 4.3.1 Decoder The stereo decoder-part of the TDA7540N (see to demodulate the MPX-signal like pilot tone-dependent MONO/STEREO-switching as well as "stereoblend" and "highcut". Adaptations like programmable input gain, roll-off compensation, selectable deemphasis time constant and a programmable field strength input allow easy adaption to different applications. ...

  • Page 30

    ... V available. The status of the detector output can be checked by reading the status byte of the 2 TDA7540N via I Field strength control The field strength input is used to control the highcut- and the stereoblend-function. In addition the signal can be also used to control the noise blanker thresholds and as input for the multipath detector ...

  • Page 31

    ... TDA7540N Stereoblend control The stereoblend control block converts the internal LEVEL-voltage into a demodulator compatible analog signal, which is used to control the channel separation between 0dB and the maximum separation. Internally this control range has a fixed upper limit, which is the internal reference voltage ...

  • Page 32

    ... To avoid this wrong behavior, which causes noise in the output signal, the noise blanker offers a deviation-dependent threshold adjustment. By rectifying the MPX signal a further signal representing the actual deviation is obtained 32/76 μ μ s and 38 s (programmable). The block diagram of the noise 15. (Figure 4) TDA7540N (Figure 3) (Figure 5) ...

  • Page 33

    ... MPCC. 4.3.4 Quality detector The TDA7540N offers a quality detector output, which gives a voltage representing the FM- reception conditions. To calculate this voltage the MPX-noise and the multipath-detector output are summed according to the following formula: =infinite and V =2 ...

  • Page 34

    ... AD-converter for RDS applications. 4.3.5 AFS control and stereo decoder mute The TDA7540N is supplied with several functionality to support AF-checks using the stereo decoder. The additional pin (AFS) is implemented in order to speed up the stereo decoder AF-functions compared to IIC controlling. ...

  • Page 35

    ... TDA7540N Frequency generation for phase comparison The RF signals applies a two modulus counter (32/33) pre-scaler, which is controlled bit A-divider. The 5-bit register (PC0 to PC4) controls this divider. In parallel the output of the prescaler connects to an 11-bit B-divider. The 11-bit PC register (PC5 to PC15) controls this ...

  • Page 36

    ... The measurement time per cycle is adjustable by setting the registers IFS. Adjust of the frequency value The center frequency of the discrimination window is adjustable by the control registers CF. 36/76 =160 μ s) and in AM mode 1kHz (t TIM mode conversion mode IF AM mode ERR + t ERR + t ERR - t ERR TDA7540N =1ms). This is TIM ...

  • Page 37

    ... The most significant 6 bits of the slave address are the device type identifier. The TDA7540N device type is fixed as "110001". The next significant bit is used to address a particular device of the previous defined type connected to the bus. ...

  • Page 38

    ... After each word receipt the TDA7540N will answer with an "acknowledge". Read operation If the master sends a slave address word with the R/W bit set to "1", the TDA7540N will transit one 8-bit data word. This data word includes the following informations: bit0 (ISS filter ON OFF) ...

  • Page 39

    ... TDA7540N 5 Software specification The interface protocol comprises: - start condition (S) - chip address byte - subaddress byte - sequence of data (N bytes + Acknowledge) - stop condition (P) The pagermode is only working up to byte 31. After byte need to send again the chip address followed by the subaddress 32 and the databytes starting from 39! 5 ...

  • Page 40

    ... OUT27 OUT26 OUT25 --- MUXST3 MUXST2 MUXST1 MUXST0 PCM --- SBSH Charge pump high current Adjacent channel filter select Adjacent channel filter gain Threshold for startpoint adjacent channel mute Adjacent channel mute depth TDA7540N IFAGC1 IFAGC0 RFAGC1 WAGC3 WAGC2 WAGC1 DEM3 DEM2 DEM1 ...

  • Page 41

    ... TDA7540N Table 11. Control register function (continued) Register Name ACNTH ACWTH AFSM AFSON AINBD AINBT AINT AMAF AMD AMCF AMIN AMNBD AMON AMSEEK AMST APPM B BWCTL CASF CF CLKSEP CTLOFF CURRH DAGC DEEMP DEM DESFT DEVM DNB DTH DWTH EW F100K FMSEEK HCON Adjacent channel narrow band threshold ...

  • Page 42

    ... Multipath influence on peak discharge current Multipath detector rectifier gain Multipath threshold Mono/Stereo switch automatically Test multiplexer output stereodecoder Noise blanker noise controlled threshold Noise blanker deviation controlled threshold Field strength controlled noise blanker AM noise blanker fixed threshold Noise blanker low threshold TDA7540N Function ...

  • Page 43

    ... TDA7540N Table 11. Control register function (continued) Register Name NBON NBPC NBRR NBSMP NBT ODCUR ODSW OUT PC PCM PDH PH PTH QDC QNG RC RFAGC RFKAGC ROC S SBA SBC SBSH SBT SBTO SBW SI SL SMODE SMCTH SMD SMO SMSL SMTH SSTH Noise blanker enable ...

  • Page 44

    ... Tuning voltage offset for prestage Tuning voltage offset for prestage (weather band mode) VCO divider Stereodecoder VCO mode Enable Stereo Decoder VCO Start level high cut Stop level high cut AM wide band AGC Xtal frequency adjust Xtal amplitude limitation TDA7540N Function ...

  • Page 45

    ... TDA7540N Table 12. Subaddress MSB 5.2.1 Data byte specification Table 13. Addr 0 Charge Pump Control MSB LSB Charge pump control - - - - STD9 - - - - FMDEMSB Page mode “OFF” Page mode enable LSB High current = 0mA High current = 0.5mA High current = 1mA High current = 1.5mA - - - ...

  • Page 46

    ... LSB = LSB = LSB = 252 LSB = 253 LSB = 254 LSB = 255 LSB MSB = MSB = 256 MSB = 512 - - - - MSB = 64768 MSB = 65024 MSB = 65280 MSB = 65536 LSB Tuning Voltage Offset = TVO = 25mV TVO = 50mV - - - - TVO = 3175mV -TVO +TVO TDA7540N Function Function Function ...

  • Page 47

    ... TDA7540N Table 17. Addr 5 IF counter control 1 MSB Table 18. Addr 6 IF counter control 2 MSB LSB 20.48ms (FM)128ms (AM ) Sample 10.24ms (FM)64ms (AM ) Sample 5.12ms (FM)32ms (AM ) Sample 2.56ms (FM)16ms (AM ) Sample 1.28ms (FM)8ms (AM ) Sample 640µs (FM)4ms (AM ) Sample 320µs (FM)2ms (AM) Sample 160µs (FM)1ms (AM ) Sample ...

  • Page 48

    ... TV is tracking with PLL TV is independing on PLL Disable local mode Enable local mode (PIN diode current = 0.5mA) LSB ISS filter control “ON” recommended 1 ISS filter control “OFF” 0 Switch ISS filter “OFF” 1 Switch ISS filter “ON” TDA7540N Function Function Function ...

  • Page 49

    ... TDA7540N Table 20. Addr 8 quality ISS filter (continued) MSB Table 21. Addr 9 quality detection adjacent channel MSB LSB Switch “OFF” ISS filter 120kHz 1 Switch “ON” ISS filter 80kHz Switch “OFF” ISS filter 30KHz for weatherband Switch “ON” ISS filter 30KHz for weatherband discharge current1µ ...

  • Page 50

    ... DEV threshold for ISS filter “OFF” ratio 1.5 DEV threshold for ISS filter “OFF” ratio 1.4 DEV threshold for ISS filter “OFF” ratio 1.3 DEV threshold for ISS filter “OFF” ratio 1 TDA7540N Function Function , discharge current 1µA , discharge current 2µ ...

  • Page 51

    ... TDA7540N Table 23. Addr 11 quality deviation detection MSB Table 24. Addr 12 softmute control 1 MSB Table 25. Addr 13 softmute control 2 MSB LSB Disable ISS filter to fixed bandwith (ISS80) in automatic control Enable ISS filter to fixed bandwith (ISS80) in automatic control LSB Startpoint mute 0 in application about 3dBµV antenna level ...

  • Page 52

    ... RFAGC threshold RFAGC threshold V 0 IFAGC threshold V 1 IFAGC threshold V 0 IFAGC threshold V 1 IFAGC threshold V TDA7540N Function Function Function = 85(77 ANT)dBµV 9-11TH = 90(82 ANT)dBµV 9-11TH = 94(86 ANT)dBµV 9-11TH = 96(88 ANT)dBµV 9-11TH = 86(60 ANT)dBµV 77TH = 92(66 ANT)dBµ ...

  • Page 53

    ... TDA7540N Table 27. Addr 15 FM AGC MSB Table 28. Addr 16 AM AGC MSB LSB KAGC threshold 80dBµV KAGC threshold 82dBµV KAGC threshold 84dBµV KAGC threshold 86dBµV KAGC threshold 88dBµV KAGC threshold 90dBµV KAGC threshold 92dBµV Keying AGC “OFF” ...

  • Page 54

    ... DAGC V = 94dBµ 71TH DAGC V = 96dBµ 71TH LSB 0mV +8.5mV +17mV - - - - +263.5mV 0mV -8.5mV -17mV - - - - -263.5mV Spike cancelation ”OFF” Threshold for spike cancelation 750mV Threshold for spike cancelation 270mV Threshold for spike cancelation 520mV recommended TDA7540N Function Function ...

  • Page 55

    ... TDA7540N Table 30. Addr 18 S-meter slider MSB Addr 20 Tank Adjust Table 31. Addr 19 IF GAIN/XTAL adjust MSB LSB meter slider offset SL=0dB meter offset SL=1dB meter offset SL=2dB - - - - meter offset SL=15dB S meter offset -SL S meter offset +SL S Meter slope 1V/decade S meter slope 1.5V/decade Overdeviation correction current max=45µ ...

  • Page 56

    ... LSB degree degree degree - - - - degree degree degree - - - - +8degree Softmute reference offset OFF Softmute reference offset -50mV Softmute reference offset -100mV Softmute reference offset -150mV TDA7540N Function Function ...

  • Page 57

    ... TDA7540N Table 34. Addr noise blanker MSB Table 35. Addr 23 switch control MSB LSB Not valid AINBT 12.5mV AINBT 25mV - - - - AINBT 187.5mV AINBD “ON” AINBD 4.0V AINBD 3.2V AINBD “OFF” AINT 8µs AINT 11µs AINT 14µs AINT 17µs LSB LOW output voltage ...

  • Page 58

    ... Forced MONO, must be set MONO/STEREO switch automatically Noise blanker peak charge current low Noise blanker peak charge current high Pilot threshold high Pilot threshold low Deemphasis 50µs Deemphasis 75µs Stereodecoder ingain = 3.75dB Stereodecoder ingain = 2.5dB Stereodecoder ingain = 1.25dB Stereodecoder ingain = 0dB TDA7540N Function Function ...

  • Page 59

    ... TDA7540N Table 38. Addr 26 stereodecoder 3 MSB Table 39. Addr 27 stereodecoder 4 MSB LSB Audio noise blanker low threshold 280mV Audio noise blanker low threshold 261mV Audio noise blanker low threshold 242mV Audio noise blanker low threshold 223mV Audio noise blanker low threshold 204mV Audio noise blanker low threshold 185mV ...

  • Page 60

    ... Quality detector coefficient a=1.05 Multipath influence on peak discharge OFF Multipath influence on peak discharge ON (-1V/ms) (MPF = 0!!) LSB Noise rectifier discharge resistor = infinite 0 1 Noise rectifier discharge resistor =56K 1 0 Noise rectifier discharge resistor =33K 1 1 Noise rectifier discharge resistor =18K TDA7540N Function Function Function ...

  • Page 61

    ... TDA7540N Table 41. Addr 29 stereodecoder 6 (continued) MSB Table 42. Addr 30 stereodecoder 7 MSB LSB Multipath detector band pass gain =6dB 1 Multipath detector band pass gain =12dB 0 Multipath detector band pass gain =9dB 1 Multipath detector band pass gain =10.5dB Multipath detector internal influence ON Multipath detector internal influence OFF Multipath detector charge current =0.8µ ...

  • Page 62

    ... AM audio delay for noise blanking “ON”(has to be set if AMNB is used !!) LSB Deemphasis shift (25/37.5µs) 1 Deemphasis no shift (50/75µs) AM corner frequency = 3.18kHz AM corner frequency = 3.10kHz AM corner frequency = 3.02kHz AM corner frequency = 1.12kHz AM corner frequency = 1.06kHz TDA7540N Function Function th1 th2 Function ...

  • Page 63

    ... TDA7540N Table 45. Addr 33 test tuner control 1 MSB Table 46. Addr 34 test tuner control 2 MSB Table 47. Addr 35 test tuner control 3 MSB Table 48. Addr 36 test tuner control 4 MSB Table 49. Addr 37 test tuner control 5 MSB Table 50. Addr 38 test stereodecoder control MSB Table 51. Addr39 test FM demodulator spike blanker and stereo decoder ...

  • Page 64

    ... Appendix 6 Appendix Figure 8. Block diagram I/Q mixer Figure 9. Block diagram VCO 64/76 TDA7540N ...

  • Page 65

    ... TDA7540N Figure 10. Block diagram keying AGC Figure 11. Block diagram ISS function Appendix 65/76 ...

  • Page 66

    ... TDA7540N High Adjacent channel present Adjacent channel higher as ac Fieldstrength lower as softmute threshold Deviation higher as threshold DWTH Deviation higher as threshold DTH*DWTH ISS filter on by logic ISS filter 80kHz (narrow) Mode2 Function inton int80 wide 0 0 wide 0 0 wide 0 0 narrow 1 1 wide ...

  • Page 67

    ... TDA7540N Figure 12. Block diagram AM part Appendix 67/76 ...

  • Page 68

    ... Appendix Figure 13. Block diagram AM IF noise blanker Figure 14. Block diagram stereodecoder 68/76 TDA7540N ...

  • Page 69

    ... TDA7540N Figure 15. Block diagram audio noise blanker Figure 16. Block diagram multipath detection Appendix 69/76 ...

  • Page 70

    ... Appendix Figure 17. Block diagram AFS function 70/76 TDA7540N ...

  • Page 71

    ... TDA7540N 7 Part list Table 54. Part list (application- and measurment circuit) Item L2, CF1,CF2 CF3 CF4 D1 D2, Description TOKO 5KM 396INS-A543EK TOKO MC152 E558HNA-100092 TOKO 7PSG P826RC-5134N TOKO PGL 5PGLC-5103N TOKO FSLM 2520-150 15uH TOKO FSLM 2520-680 68uH SIEMENS SIMID03 B82432 1mH TOKO LLQ 2012-220 TOKO LLQ 2012-680 muRata SFE10 ...

  • Page 72

    ... Application circuit 8 Application circuit Figure 18. Application circuit 72/76 TDA7540N ...

  • Page 73

    ... TDA7540N 9 Application notes Following items are important to get highest performance of TDA7540N in application order to avoid leakage current from PLL loop filter input to ground a guardring is recommended around loop filter PIN’s with PLL reference (VREF2) voltage potential. 2. Distance between Xtal and VCO input PIN 18 should be far as possible and Xtal package should get a shield versus ground ...

  • Page 74

    ... TDA7540N OUTLINE AND MECHANICAL DATA LQFP80 (14x14x1.40mm) Low profile Quad Flat Package 0062342 D ...

  • Page 75

    ... TDA7540N 11 Revision history Table 55. Document revision history Date 12-Nov-2007 Revision 1 Initial release. Revision history Changes 75/76 ...

  • Page 76

    ... Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America 76/76 Please Read Carefully: © 2007 STMicroelectronics - All rights reserved STMicroelectronics group of companies www.st.com TDA7540N ...