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TDA7512
AM/FM CAR RADIO TUNER IC WITH INTELLIGENT SELECTIVITY SYSTEM (ISS)
PRELIMINARY DATA
FM-PART s RF AGC GENERATION BY RF AND IF DETECTION s I/Q MIXER FOR 1ST FM IF 10.7MHz WITH IMAGE REJECTION s 2 PROGRAMMABLE IF-GAIN STAGES nd s MIXER FOR 2 IF 450KHz s INTERNAL 450KHz BANDPASS FILTER WITH THREE BANDWIDTHS CONTROLLED BY ISS
s
FULLY INTEGRATED FM-DEMODULATOR WITH NOISE CANCELLATION
TQFP64 ORDERING NUMBER: TDA7512
AM-PART s WIDE AND NARROW AGC GENERATION s PREAMPLIFIER AND MIXER FOR 1ST IF 10.7MHz, AM UPCONVERSION nd s MIXER FOR 2 IF 450KHz s INTEGRATED AM-DEMODULATOR s OUTPUT FOR AM-STEREO-DECODER ADDITIONAL FEATURES s VCO FOR WORLD TUNING RANGE s HIGH PERFORMANCE FAST PLL FOR RDSSYSTEM s IF COUNTER FOR FM AND AM WITH SEARCH STOP SIGNAL s QUALITY DETECTOR FOR LEVEL, DEVIATION, ADJACENT CHANNEL AND MULTIPATH s QUALITY DETECTION INFORMATIONS AS ANALOG SIGNALS EXTERNAL AVAILABLE
s
s s s s
ISS (INTELLIGENT SELECTIVITY SYSTEM) FOR CANCELLATION OF ADJACENT CHANNEL AND NOISE INFLUENCES ADJACENT CHANNEL MUTE FULLY ELECTRONIC ALIGNMENT ALL FUNCTIONS I2C-BUS CONTROLLED ISS FILTER STATUS INFORMATION I2C-BUS READABLE
DESCRIPTION The TDA7512 is a high performance tuner circuit for AM/FM car radio. It contains mixer, IF amplifier, demodulator for AM and FM, 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.
September 2003
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
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BLOCK DIAGRAM
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PIN CONNECTION (Top view)
AMMIX2OUT1 AMMIX2OUT2 AMRFAGCTC FMAMP1OUT FMAMP2OUT FMIF1AGCIN AMIF1IN/ISS
FMAMP1IN
FMAMP2IN
MIX1OUT1
MIX1OUT2
FMIF1REF
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 AMMIX1IN2 AMMIX1IN1 AMRFAGCIN AMRFAGCOUT AMPINDR FMPINDR FMMIX1IN1 GNDRF FMMIX1IN2 FMAGCTC TV1 TV2 ADJCH FSU ISSTC VCCVCO 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 XTALD GNDVCC3 SSTOP SDA SCL VCC3 LPOUT VREF2 LPAM LPFM GNDVCO DEVTC XTALG VCOB VCOE LPHC 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 VREF1 GNDDEM FMMIX2IN1 FMMIX2IN2 REFDEMC FM/AM AMIF2IN MUTETC AMDETC AMAGC2TC AMIFBPF AMIFREF MPX/AFAM VCC1 FSW AMST/MP GNDVCC1
GNDVCC2
TQFP64
GNDIF1
VCCIF1
PIN DESCRIPTION
N
1 2 3 4 5 6 7 8 9 10 11 12 13
Pin Name
AMMIX1IN2 AMMIX1IN1 AMRFAGCIN AMRFAGCOUT AMPINDR FMPINDR FMMIX1IN1 GNDRF FMMIX1IN2 FMAGCTC TV1 TV2 ADJCH AM Input2 Mixer1 AM Input1 Mixer1 Input AM RF AGC Output AM RF AGC AM PIN Diode Driver Output FM PIN Diode Driver Output FM Input1 Mixer1 RF Ground FM Input2 Mixer1 FM AGC Time Constant Tuning Voltage Preselection1 Tuning Voltage Preselection2 Ident. Adjacent Channel Output
Function
VCC2
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PIN DESCRIPTION (continued)
N
14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45
Pin Name
FSU ISSTC VCCVCO GNDVCO VCOB VCOE DEVTC XTALG XTALD GNDVCC3 SSTOP SDA SCL VCC3 LPOUT VREF2 LPAM LPFM LPHC GNDVCC1 AMST/MP FSW VCC1 MPX/AFAM AMIFREF AMIFBPF AMAGC2TC AMDETC MUTETC AMIF2IN REFDEMC FM/AM FMMIX2IN2 Unweighted Fieldstrength Output Time Constant for ISS Filter Switch VCO Supply VCO Ground VCO Input Base VCO Output Emitter Deviation Detector Time Constant Xtal Oscillator to MOS Gate Xtal Oscillator to MOS Drain VCC3 Ground Search Stop Output I2C-Bus Data I2C-Bus Clock Supply Tuning Voltage Op Amp Output to PLL Loop Filters Voltage Reference for PLL Op Amp Op Amp Input to PLL Loop Filters AM Op Amp Input to PLL Loop Filters FM High Current PLL Loop Filter Input Digital Ground AM Stereo Out / Ident. Multipath Output Weighted Fieldstrength Output Digital Supply MPX Output / AM AF Output Reference Voltage AM IF Amp AM IF Filter AM AGC2 Time Constant AM Detector Capacitor Softmute Time Constant Input AM IF2 Demodulator Reference FM/AM FM IF1 MIX2 Input1
Function
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PIN DESCRIPTION (continued)
N
46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
Pin Name
FMMIX2IN1 GNDDEM VREF1 GNDVCC2 FMAMP2OUT VCC2 FMAMP2IN FMIF1REF FMAMP1OUT AMMIX2OUT2 AMMIX2OUT1 FMAMP1IN AMIF1IN/ISS GNDIF1 FMIF1AGCIN VCCIF1 AMRFAGCTC MIX1OUT2 MIX1OUT1 FM IF1 MIX2 Input2 Ground FM Demodulator Reference 5V Analog Ground FM IF1 Amplifier2 Output Analog Supply FM IF1 Amplifier2 Input FM IF1 Amplifier Reference FM IF1 Amplifier1 Output AM Tank 450kHz AM Tank 450kHz FM IF1 Amplifier1 Input AM IF1 Input/ISS filter status FM IF1 Ground FM IF1 AGC Input IF1 Supply AM RF AGC Time Constant MIX Tank 10.7MHz MIX Tank 10.7MHz
Function
THERMAL DATA Table 1.
Symbol Rth(j-a) Parameter Thermal resistance junction to ambient Value 68 max. Unit C/W
ABSOLUTE MAXIMUM RATINGS Table 2.
Symbol VS Tamb Tstg Supply Voltage Ambient Temperature Storage Temperature Parameter Value 10.5 -40 to 85 -55 to +150 Unit V C C
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Table 3. ELECTRICAL CHARACTERISTICS Tamb = +25C, VCC1 = VCC2 = VCC3 = VCCVCO = VCCMIX1 = VCCIF1=8.5V, fRF = 98MHz, dev. = 40kHz, fMOD = 1kHz, fIF1 = 10.7MHz, fIF2 = 450KHz, fXtal = 10.25MHz, in application circuit, unless otherwise specified.
Symbol Supply VCC1 VCC2 VCC3 VCCVCO VCCMIX1 VCCMIX2 VCCIF1 ICC1 ICC1 ICC2 ICC2 ICC3 ICCVCO ICCMIX1 ICCMIX1 ICCMIX2 ICCIF1 Digital supply voltage Analog supply voltage Analog tuning voltage VCO supply voltage MIX1 supply voltage MIX2 supply voltage IF1 supply voltage Supply current Supply current Supply current Supply current Supply current Supply current Supply current Supply current Supply current Supply current FM ON AM ON AM ON FM ON AM ON FM ON / VCO:3 AM ON 7.5 7.5 7.5 7.5 7.5 7.5 7.5 8.5 8.5 8.5 8.5 8.5 8.5 8.5 7.5 10 70 70 2 9 8 7 7 6 10 10 10 10 10 10 10 V V V V V V V mA mA mA mA mA mA mA mA mA mA Parameter Test Condition Min. Typ. Max. Unit
Reference Voltages VREF1 VREF2 Internal reference voltage Internal reference voltage IREF1 = 0mA IREF2 = 0mA 5 2.5 V V
Wide Band RF AGC V7-9 V7-9 Lower threshold start Upper threshold start V10 = 2.5V V10 = 2.5V 85 96 dBV dBV
Narrow Band IF & Keying AGC V60 V60 Lower threshold start Upper threshold start KAGC = off, V7-9 = 0mVRMS KAGC = off, V7-9 = 0mVRMS 86 98 dBV dBV
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Table 3. ELECTRICAL CHARACTERISTICS (continued) Tamb = +25C, VCC1 = VCC2 = VCC3 = VCCVCO = VCCMIX1 = VCCIF1=8.5V, fRF = 98MHz, dev. = 40kHz, fMOD = 1kHz, fIF1 = 10.7MHz, fIF2 = 450KHz, fXtal = 10.25MHz, in application circuit, unless otherwise specified.
Symbol V60 Parameter Lower threshold start with KAGC Test Condition Min. Typ. 98 Max. Unit dBV
fIF=300KHz fIF=300KHz V35= +0.4V
KAGC = max, V7-9 = 0mVRMS,
V35
Startpoint KAGC
KAGC = max, V7-9 = 0mVRMS,
3.6
V
fIF1 generate FSW level at V35
RIN CIN
Control range KAGC Input resistance Input capacitance
16 10 2.5
dB k pF
AGC Time Constant Output V10 V10 I10 I10 Max. AGC output voltage V7-9 = 0mVRMS V7-9 = 50mVRMS V7-9 = 0mVRMS,V10 = 2.5V V7-9 = 50mVRMS,V10 = 2.5V -12.5 1.25 VREF1 +VBE 0.5 V
Min. AGC output voltage Min. AGC charge current Max. AGC discharge current
V
A
mA
AGC PIN Diode Driver Output I6 I6 AGC OUT, current min. AGC OUT, current max. V7-9 = 0mVRMS, V6 = 2.5V V7-9 = 50 mVRMS, V6 = 2.5V 50 -20
A
mA
I/Q Mixer1 (10.7MHz) RIN CIN ROUT V7,9 gm F CP1dB IIP3 IQG IQP IRR IRR Input resistance Input capacitance Output resistance Input dc bias Conversion transconductance Noise figure 1dB compression point 3rd order intermodulation I/Q gain adjust I/Q phase adjust Image rejection ratio Image rejection ratio G PH ratio wanted/image with gain and phase adjust -1 -7 30 40 40 46 400 generator resistance referred to diff. mixer input differential differential differential 100 3.2 17 3 100 122 +1 +8 10 4 k pF k V mS dB dBV dBV % DEG dB dB
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Table 3. ELECTRICAL CHARACTERISTICS (continued) Tamb = +25C, VCC1 = VCC2 = VCC3 = VCCVCO = VCCMIX1 = VCCIF1=8.5V, fRF = 98MHz, dev. = 40kHz, fMOD = 1kHz, fIF1 = 10.7MHz, fIF2 = 450KHz, fXtal = 10.25MHz, in application circuit, unless otherwise specified.
Symbol Parameter Test Condition Min. Typ. Max. Unit
IF1 Amplifier1 +2 (10.7MHz) Gmin Gmax RIN ROUT CP1dB IIP3 Min. gain Max. gain Input resistance Output resistance 1dB compression point 3rd order Intermodulation referred to 330 input referred to 330 input IFG IFG 18 26 330 330 105 126 dB dB

dBV dBV
Mixer2 (450kHz) RIN V46 V48 G Input impedance Max. input voltage Limiting sensitivity Mixer gain S/N = 20dB 330 900 25 18
mVRM
S
V
dB
Limiter 1 (450kHz) GLimiter Gain 80 dB
Demodulator, Audio Output THD VMPX ROUT |V|min |V|max S/N Quality Detection S-meter, Unweighted Fieldstrength V46 V14 V14 Min. input voltage MIX2 Fieldstrength output Fieldstrength output voltage per decade voltage per decade V46 = 0VRMS V46 = 1VRMS SMSL = 0 SMSL = 1 10 0.1 4.9 1 1.5 MPX output signal Output resistance DC offset fine adjust DC offset fine adjust DEM, MENA=1 DEM, MENA=1 Dev.= 40kHz,V46 = 10mVRMS Dev.= 75kHz, V46 = 10mVRMS Dev.= 75kHz 500 50 8.5 264 76 0.1 % mVRM
S
mV mV dB
V
V V V V
V14 V14
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Table 3. ELECTRICAL CHARACTERISTICS (continued) Tamb = +25C, VCC1 = VCC2 = VCC3 = VCCVCO = VCCMIX1 = VCCIF1=8.5V, fRF = 98MHz, dev. = 40kHz, fMOD = 1kHz, fIF1 = 10.7MHz, fIF2 = 450KHz, fXtal = 10.25MHz, in application circuit, unless otherwise specified.
Symbol Parameter S-meter offset Output resistance Temp coeff. Test Condition SL, SMSL=1 Min. -15 200 0 Typ. Max. 15 Unit dB
V14
ROUT TK
ppm/K
S-meter, Weighted Fieldstrength V35 V35 ROUT Fieldstrength output Fieldstrength output Output resistance V46 = 0VRMS V46 = 1VRMS 2.5 4.9 12 V V k
Adjacent Channel Gain Gmin Gmax Gain minimum Gain maximum ACG=0 ACG=1 32 38 dB dB
Adjacent Channel Filter fHP fBP f-20dB -3dB frequency highpass Centre frequency Attenuation 20dB ACF=0 ACF=1 100 100 70 kHz kHz kHz
Adjacent Channel Output V13 V13 ROUT Output voltage low Output voltage high Output resistance 0.1 4.9 4 V V k
Multipath Channel Gain Gmin Gmax Gain minimum Gain maximum MPG=0 MPG=1 12 23 dB dB
Multipath Bandpass Filter fLower fUpper Q Centre frequency low Centre frequency up Quality factor MPF=0 MPF=1 5 19 31 10 kHz kHz
Multipath Output V34 V34 ROUT Output voltage low Output voltage high Output resistance 0.1 4.9 2.5 V V k
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Table 3. ELECTRICAL CHARACTERISTICS (continued) Tamb = +25C, VCC1 = VCC2 = VCC3 = VCCVCO = VCCMIX1 = VCCIF1=8.5V, fRF = 98MHz, dev. = 40kHz, fMOD = 1kHz, fIF1 = 10.7MHz, fIF2 = 450KHz, fXtal = 10.25MHz, in application circuit, unless otherwise specified.
Symbol Parameter Test Condition Min. Typ. Max. Unit
ISS (intelligent Selectivity System) Filter 450kHz fcentre BW 3dB BW 20dB BW 3dB BW 20dB BW 3dB BW 20dB Centre frequency Bandwidth, -3dB Bandwidth, -20dB Bandwidth, -3dB Bandwidth, -20dB Bandwidth weather band -20dB weather band fREF_intern = 450kHz ISS80 = 1 ISS80 = 1 ISS80 = 0 ISS80 = 0 ISS30 = 1 ISS30 = 1 450 80 150 120 250 30 80 kHz kHz kHz kHz kHz kHz kHz
Adjacent Channel ISS Filter Threshold VNTH VNTH VWTH VWTH Internal low threshold Internal high threshold Internal low threshold Internal high threshold ACNTH ACNTH ACWTH ACWTH 0 0.3 0.25 0.95 V V V V
Multipath Threshold VTHMP VTHMP Internal low threshold Internal high threshold MPTH MPTH 0.50 1.25 V V
ISS Filter Time Constant I15 I15 I15 I15 I15 I15 V15 Charge current low mid Charge current high mid Charge current low narrow Charge current high narrow Discharge current low Discharge current high Low voltage TISS, ISSCTL = 1 TISS, ISSCTL = 1 TISS, ISSCTL = 1 TISS, ISSCTL = 1 TISS, ISSCTL = 0 TISS, ISSCTL = 0 ISSCTL = 0 -74 -60 -124 -110 1 15 0.1
A A A A A A
V
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Table 3. ELECTRICAL CHARACTERISTICS (continued) Tamb = +25C, VCC1 = VCC2 = VCC3 = VCCVCO = VCCMIX1 = VCCIF1=8.5V, fRF = 98MHz, dev. = 40kHz, fMOD = 1kHz, fIF1 = 10.7MHz, fIF2 = 450KHz, fXtal = 10.25MHz, in application circuit, unless otherwise specified.
Symbol V15 Parameter High voltage Test Condition ISSCTL = 1 Min. Typ. 4.9 Max. Unit V
ISS Filter Switch Threshold V15 V15 V15 V15 I20 I20 I20 I20 DEVWTH DEVWTH RATIOmi
n
Threshold ISS on Threshold ISS off Threshold ISS narrow on Threshold ISS narrow off Charge current low Charge current high Discharge current low Discharge current high Internal low threshold Internal high threshold Referred to threshold Referred to threshold
ISSCTL = 0 ISSCTL = 0 ISSCTL = 0 ISSCTL = 0 TDEV TDEV TDEV TDEV DWTH DWTH DTH DTH
3 1 4 2 -20 -34 6 20 30 75 1 1.5
V V V V
A A A A
kHz kHz
RATIOm
ax
Softmute VANT VANT aSMmin aSMmax aSMTHIS
S
Upper startpoint lower startpoint Min. softmute depth Max. softmute depth Mute depth threshold for ISS filter on Internal AC mute threshold AC mute depth Charge current Discharge current
SMTH, SMD, SLOPE = 0 SMTH, SMD, SLOPE = 0 SMD, SLOPE = 0, SMTHUpper SMD, SLOPE = 0, SMTHUpper SMCTH ACM ACMD 0.2 60 4
10 3 18 36 2 340 10 -47.5 2.5
dBV dBV dB dB dB mV dB
VACTH aSMAC I42 I42
A A
S/N Over All S/N VANT_min = 60dBV, dev.= 40kHz,LP=15KHz deemphasis t = 50s 66 dB
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Table 4. ELECTRICAL CHARACTERISTICS Tamb = +25C, VCC1 = VCC2 = VCC3 = VCCVCO = VCCMIX1 = VCCMIX2 = 8.5V, fRF = 1MHz, fMOD = 400Hz at 30% AMfIF1 = 10.7MHz, fIF2 = 450kHz, fxtal = 10.25MHz, in application circuit, (unless otherwise noted, VINRF antenna input).
Symbol Global VANT min VANT us Max. sensitivity Usable sensitivity IF2 AGC Range Signal to Noise Ratio IF rejection Ref.: VINRF = 60dBV, (S+N)/N = 20 dB Ref.: VINRF = 60dBV, Ref.: VINRF = 60ddBV Ref: VINRF = 60dBV, IF1 = 10.7MHz IF2 = 450kHz Ref.: VINRF = 60dBV, VAF = -3 dB VINRF = 60dBV, m = 0.8 m = 0.3 VINRF = 120 dbV, m = 0.8 m = 0.3 VINRF = 60dBV VINRF = 60dB, m=off WAGC WAGC DAGC seek seek/seek off 30 56 50 60 19 26 dBV dBV dB dB Parameter Test Condition Min. Typ. Max. Unit
VANT
(S+N)/N aIF
100 100 3.6
dB dB kHz
fAF
Frequency response
THD
Total Harmonic Distortion
0.5 0.3 1.0 0.3 220 190 90 109 90 109 74 96 160 30
%
V37 V34 V3 V58 V58 |I40max| CCR
Output level Output level Min. RF AGC threshold Max. RF AGC threshold Min. IF AGC threshold Max. IF AGC threshold Min. DAGC threshold Max. DAGC threshold AGC2 charge current Charge current ratio
mVRM
S
mVRM
S
dBV dBV dBV dBV dBV dBV
A
AGC Voltage Driver Output V4 V4 | I4 | Max. AGC output voltage Min. AGC output voltage AGC current 100 3.5 0.5 V V
A
AGC PIN Diode Driver Output I5 AGC driver current -2 mA
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Table 4. ELECTRICAL CHARACTERISTICS (continued) Tamb = +25C, VCC1 = VCC2 = VCC3 = VCCVCO = VCCMIX1 = VCCMIX2 = 8.5V, fRF = 1MHz, fMOD = 400Hz at 30% AMfIF1 = 10.7MHz, fIF2 = 450kHz, fxtal = 10.25MHz, in application circuit, (unless otherwise noted, VINRF antenna input).
Symbol Parameter Test Condition Min. Typ. Max. Unit
AM Mixer1 (10.7MHz) RIN CIN ROUT CP1dB IIP3 F A Cmin Cmax C31-64 AM Mixer2 (450kHz) R58 C58 CP1dB IIP3 F A Input resistance Input capacitance 1dB compression point 3rd order intermodulation Noise figure Max. gain Gain control range Min. cap step Max. cap IF2T IF2T IF2T Mixer2 tank output referred to diff. mixer input 10 2.5 120 132 12 34 20 1.6 24 2 k pF dBV dBV dB dB dB pF pF pF Input resistance Input capacitance Output impedance 1dB compression point 3rd order intermodulation Noise figure Gain Min. capacitance step Max. capacitance IF1T IF1T IF1T differential differential differential referred to diff. mixer input 100 115 132 8 26 0.55 8.25 2 1.2 4 k pF k dBV dBV dB dB pF pF pF
A
Cmin Cmax C55-56
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Table 5. ADDITIONAL PARAMETERS
Symbol Parameter Test Condition Min. Typ. Max. Unit
Output of Tuning Voltages (TV1,TV2) VOUT ROUT Output voltage Output impedance TVO 0.5 20 VCC30.5 V k
Xtal Reference Oscillator fLO CStep Cmax Reference frequency Min. cap step Max. cap Deviation versus VCC2 Deviation versus temp CLoad = 15pF XTAL XTAL 10.25 0.75 23.25 1.5 0.2 MHz pF pF ppm/V ppm/K
f/f f/f
VCC2 = 1V
-40C < T < +85C
I2C-Bus interface fSCL VIL VIH IIN VO Clock frequency Input low voltage Input high voltage Input current Output acknowledge voltage IO = 1.6mA 3 -5 5 0.4 400 1 kHz V V
A
V
Loop Filter Input/Output -IIN IIN VOL VOH IOUT IOUT Input leakage current Input leakage current Output voltage Low Output voltage High Output current, sink Output current, source VIN = GND, PDOUT = Tristate VIN = VREF1 PDOUT = Tristate IOUT = -0.2mA IOUT = 0.2mA VOUT = 1V to VCC3-1V VOUT = 1V to VCC3-1V -10 VCC30.5 -0.1 -0.1 0.05 VCC30.05 10 0.1 0.1 0.5
A A
V V mA mA
Voltage Controlled Oscillator (VCO) fVCOmin fVCOmax C/N Minimum VCO frequency Maximum VCO frequency Carrier to Noise fVCO= 200MHz, f=1KHz, B=1Hz, closed loop 80 50 260 MHz MHz dBc
SSTOP Output (Open Collector) V24 V24 -I24 I24 Output voltage low Output voltage high Output leakage current Output current, sink V24 = 5V V24 = 0.5V-5V -0.1 I24 = -200A 0.2 0.5 5 0.1 1 V V
A
mA
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1. 1.1 1.2 Functional Description FM Section Mixer1, AGC and 1.IF
FM quadrature I/Q-mixer converts FM RF to 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 gain- and phase-error generated as well in mixer as VCO stage can be compensated by software (G,PH) It is capable of tuning the US FM, US weather, Europe FM, Japan FM and East Europe FM bands - US FM = 87.9 to 107.9 MHz - US weather = 162.4 to 162.55 MHz - Europe FM = 87.5 to 108 MHz - Japan FM = 76 to 91 MHz - East Europe FM = 65.8 to 74 MHz The AGC operates on different sensitivities and bandwidths in order to improve the input sensitivity and dynamic range. AGC thresholds are programmable by software (RFAGC,IFAGC,KAGC). The output signal is a controlled current for double pin diode attenuator. Two 10.7MHz programmable amplifiers (IFG1, IFG2) correct the IF ceramic insertion loss and the costumer level plan application. 1.3 Mixer2, Limiter and Demodulator
In this 2. mixer stage the first 10.7MHz IF is converted into the second 450kHz IF. A multi-stage limiter generates signals for the complete integrated demodulator without external tank. MPX output DC offset versus noise DC level is correctable by software (DEM). 1.4 1.4.1 Quality Detection and ISS Fieldstrength
Parallel to mixer2 input a 10.7MHz limiter generates a signal for digital IF counter and a fieldstrength output signal. This internal unweighted fieldstrength is used for keying AGC, adjacent channel and multipath detection and is available at PIN14 (FSU) after +6dB buffer stage. The behaviour of this output signal can be corrected for DC offset (SL) and slope (SMSL). The internal generated unweighted fieldstrength is filtered at PIN35 and used for softmute function and generation of ISS filter switching signal for weak input level (sm). 1.4.2 Adjacent Channel Detector
The input of the adjacent channel detector is AC coupled from internal unweighted fieldstrength. A programmable highpass or bandpass (ACF) and amplifier (ACG) as well as rectifier determines the influences. This voltage is compared with adjustable comparator1 thresholds (ACWTH, ACNTH). The output signal of this comparator generates a DC level at PIN15 by programmable time constant. Time control (TISS) for a present adjacent channel is made by charge and discharge current after comparator1 in an external capacitance. The charge current is fixed and the discharge current is controlled by I2C Bus. This level produces digital signals (ac, ac+) in an additional comparator4. The adjacent channel information is available as analog output signal after rectifier and +8dB output buffer. 1.4.3 Multipath Detector
The input of the multipath detector is AC coupled from internal unweighted fieldstrength. A programmable bandpass (MPF) and amplifier (MPG) as well as rectifier determines the influences. This voltage is compared with an adjustable comparator2 thresholds (MPTH). The output signal of this comparator2 is used for the "Milano" effect. In this case the adjacent channel detection is switched off. The "Milano" effect is selectable by I2C Bus (MPOFF). The multipath information is available as analog output signal after rectifier and +8dB output buffer.
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1.4.4 450kHz IF Narrow Bandpass Filter (ISS filter)
The device gets an additional second IF narrow bandpass filter for suppression of noise and adjacent channel signal influences. This narrow filter has three switchable bandwidthes, narrow range of 80kHz, mid range of 120kHz and 30KHz for weather band information. Without ISS filter the IF bandwidth (wide range) is defined only by ceramic filter chain. The filter is switched in after mixer2 before 450kHz limiter stage. The centre frequency is matching to the demodulator center frequency. 1.4.5 Deviation Detector
In order to avoid distortion in audio output signal the narrow ISS filter is switched OFF for present overdeviation. Hence the demodulator output signal is detected. A lowpass filtering and peak rectifier generates a signal that is defined by software controlled current (TDEV) in an external capacitance. This value is compared with a programmable comparator3 thresholds (DWTH, DTH) and generates two digital signals (dev, dev+). For weak signal condition deviation threshold is proportinal to FSU. 1.4.6 ISS Switch Logic
All digital signals coming from adjacent channel detector, deviation detector and softmute are acting via switching matrix on ISS filter switch. The IF bandpass switch mode is controlled by software (ISSON, ISS30, ISS80, CTLOFF). The switch ON of the IF bandpass is also available by external manipulation of the voltage at PIN15. Two application modes are available (APPM). The conditions are described in table 34. 1.5 Soft Mute Control The external fieldstrength signal at PIN 35 is the reference for mute control. The startpoint and mute depth are programmable (SMTH, SMD) in a wide range. The time constant is defined by external capacitance. Additional adjacent channel mute function is supported. A highpass filter with -3dB threshold frequency of 100kHz, amplifier and peak rectifier generates an adjacent noise signal from 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). 1.6 AM Section
The up/down conversion is combined with gain control circuit sensing three input signals, narrow band information at PIN 39, upconversion signal (IFAGC) at PIN 58 and wide band information (RFAGC) at PIN 3.This gain control gives two output signals. The first one is a current for pin diode attenuator and the second one is a voltage for preamplifier. Time constant of RF- and IF-AGC is defined by internal 100k resistor and external capacitor at PIN 62. The intervention points for AGC (DAGC,WAGC) are programmable by software. In order to avoid a misbehaviour of AGC intervention point it is important to know that the DAGC threshold has to be lower than WAGC threshold ! The oscillator frequency for upconcersion-mixer1 is generated by dividing the FM VCO frequency after VCO (VCOD) and AM predivider(AMD). It is possible to put in a separate narrow bandpass filter before mixer2 at PIN 58. In this case input P58 needs the DC-operation point from PIN 53 via resistance matched with filter impedance. Additional it is possible to use second 10,7MHz ceramic filter by internal switch between mixer2 input and PIN 52. This feature increases 900KHz attenuation. In mixer2 the IF1 is downconverted into the IF2 450kHz. After filtering by ceramic filter a 450kHz amplifier is included with an additional gain control of IF2 below DAGC threshold. Time constant is defined by capacitance at PIN 40 Mixer1 and mixer2 tanks are software controlled adjustable (IF1T, IF2T). The demodulator is a peak detector to generate the audio output signal. A separate output is available for AMIF stereo (AMST).
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1.7 1.7.1 PLL and IF Counter Section PLL Frequency Synthesizer Block
This part contains a frequency synthesizer and a loop filter for the radio tuning system. Only one VCO is required to build a complete PLL system for FM world tuning and AM upconversion. For auto search stop operation an IF counter system is available. The counter works in a two stages configuration. The first stage is a swallow counter with a two modulus (32/33) precounter. The second stage is an 11-bit programmable counter. The circuit receives the scaling factors for the programmable counters and the values of the reference frequencies via an I2C-Bus interface.The reference frequency is generated by an adjustable internal (XTAL) oscillator followed by the reference divider. The main reference and step-frequencies are free selectable (RC, PC). Output signals of the phase detector are switching the programmable current sources. The loop filter integrates their currents to a DC voltage. The values of the current sources are programmable by 6 bits also received via the I2C Bus (A, B, CURRH, LPF). To minimize the noise induced by the digital part of the system, a special guard configuration is implemented. The loop gain can be set for different conditions by setting the current values of the chargepump generator. 1.7.2 Frequency Generation for Phase Comparison
The RF signals applies a two modulus counter (32/33) pre-scaler, which is controlled by a 5-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 Bdivider. The 11-bit PC register (PC5 to PC15) controls this divider Dividing range: fVCO = [33 x A + (B + 1 - A) x 32] x fREF fVCO = (32 x B + A + 32) x fREF Important: For correct operation: A 32; B A 1.7.3 Three State Phase Comparator The phase comparator generates a phase error signal according to phase difference between fSYN and fREF. This phase error signal drives the charge pump current generator. 1.7.4 Charge Pump Current Generator
This system generators signed pulses of current. The phase error signal decides the duration and polarity of those pulses. The current absolute values are programmable by A register for high current and B register for low current. 1.7.5 Inlock Detector
Switching the chargepump in low current mode can be done either via software or automatically by the inlock detector, by setting bit LDENA to "1". After reaching a phase difference about lower than 40nsec the chargepump is forced in low current mode. A new PLL divider alternation by I2C-Bus will switch the chargepump in the high current mode. 1.7.6 Low Noise CMOS Op-amp
An internal voltage divider at pin VREF2 connects the positive input of the low noise op-amp. The charge pump output connects the negative input. This internal amplifier in cooperation with external components can provide an active filter. The negative input is switchable to three input pins, to increase the flexibility in application. This feature allows two separate active filters for different applications. While the high current mode is activated LPHC output is switched on. 1.7.7 IF Counter Block
The aim of IF counter is to measure the intermediate frequency of the tuner for AM and FM mode. The input signal for FM and AM upconversion is the same 10.7MHz IF level after limiter. AM 450KHz signal is coming from
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narrow filtered IF2 before demodulation. A switch controlled by IF counter mode (IFCM) is chosing the input signal for IF counter. The grade of integration is adjustable by eight different measuring cycle times. The tolerance of the accepted count value is adjustable, to reach an optimum compromise for search speed and precision of the evaluation. 1.7.8 The IF-Counter Mode
The IF counter works in 3 modes controlled by IFCM register. 1.7.9 Sampling Timer
A sampling timer generates the gate signal for the main counter. The basically sampling time are in FM mode 6.25kHz (tTIM=160s) and in AM mode 1kHz (tTIM=1ms). This is followed by an asynchronous divider to generate several sampling times. 1.7.10 Intermediate Frequency Main Counter This counter is a 11 - 21-bit synchronous autoreload down counter. Five bits (CF) are programmable to have the possibility for an adjust to the centre frequency of the IF-filter. The counter length is automatic adjusted to the chosen sampling time and the counter mode (FM, AM-UPC, AM). At the start the counter will be loaded with a defined value which is an equivalent to the divider value (tSample x fIF). If a correct frequency is applied to the IF counter frequency input at the end of the sampling time the main counter is changing its state from 0h to 1FFFFFh. This is detected by a control logic and an external search stop output is changing from LOW to HIGH. The frequency range inside which a successful count result is adjustable by the EW bits. tCNT = (CF + 1696+1) / fIF tCNT = (CF + 10688+1) / fIF tCNT = (CF + 488+1) / fIF Counter result succeeded: tTIM tCNT - tERR tTIM tCNT + tERR Counter result failed: tTIM > tCNT + tERR tTIM < tCNT - tERR tTIM = IF timer cycle time (sampling time) tCNT = IF counter cycle time tERR = discrimination window (controlled by the EW registers) The IF counter is only started by inlock information from the PLL part. It is enabled by software (IFENA). 1.7.11 Adjustment of the Measurement Sequence Time The precision of the measurements is adjustable by controlling the discrimination window. This is adjustable by programming the control registers EW. The measurement time per cycle is adjustable by setting the registers IFS. 1.7.12 Adjust of the Frequency Value The center frequency of the discrimination window is adjustable by the control registers CF. FM mode AM up conversion mode AM mode
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1.8 I2C-Bus Interface
The TDA7512 supports the I2C-Bus protocol. This protocol defines any device that sends data onto the bus as a transmitter, and the receiving device as the receiver. The device that controls the transfer is a master and device being controlled is the slave. The master will always initiate data transfer and provide the clock to transmit or receive operations. 1.8.1 Data Transition
Data transition on the SDA line must only occur when the clock SCL is LOW. SDA transitions while SCL is HIGH will be interpreted as START or STOP condition. 1.8.2 Start Condition
A start condition is defined by a HIGH to LOW transition of the SDA line while SCL is at a stable HIGH level. This "START" condition must precede any command and initiate a data transfer onto the bus. The device continuously monitors the SDA and SCL lines for a valid START and will not response to any command if this condition has not been met. 1.8.3 Stop Condition
A STOP condition is defined by a LOW to HIGH transition of the SDA while the SCL line is at a stable HIGH level. This condition terminates the communication between the devices and forces the bus-interface of the device into the initial condition. 1.8.4 Acknowledge
Indicates a successful data transfer. The transmitter will release the bus after sending 8 bits of data. During the 9th clock cycle the receiver will pull the SDA line to LOW level to indicate it receive the eight bits of data. 1.8.5 Data Transfer
During data transfer the device samples the SDA line on the leading edge of the SCL clock. Therefore, for proper device operation the SDA line must be stable during the SCL LOW to HIGH transition. 1.8.6 Device Addressing
To start the communication between two devices, the bus master must initiate a start instruction sequence, followed by an eight bit word corresponding to the address of the device it is addressing. The most significant 6 bits of the slave address are the device type identifier. The TDA7512 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. The state of the hardwired PIN 41 defines the state of this address bit. So up to two devices could be connected on the same bus. When PIN 41 is connected to VCC2 the address bit "1" is selected. In this case the AM part doesn't work. Otherwise the address bit "0" is selected (FM and AM is working). Therefor a double FM tuner concept is possible. The last bit of the start instruction defines the type of operation to be performed: - When set to "1", a read operation is selected - When set to "0", a write operation is selected The TDA7512 connected to the bus will compare their own hardwired address with the slave address being transmitted, after detecting a START condition. After this comparison, the TDA7512 will generate an "acknowledge" on the SDA line and will do either a read or a write operation according to the state of R/W bit. 1.8.7 Write Operation
Following a START condition the master sends a slave address word with the R/W bit set to "0". The device will generate an "acknowledge" after this first transmission and will wait for a second word (the word address field). This 8-bit address field provides an access to any of the 32 internal addresses. Upon receipt of the word address the TDA7512 slave device will respond with an "acknowledge". At this time, all the following words transmitted
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to the TDA7512 will be considered as Data. The internal address will be automatically incremented. After each word receipt the TDA7512 will answer with an "acknowledge". 1.8.8 Read Operation
If the master sends a slave address word with the R/W bit set to "1", the TDA7512 will transit one 8-bit data word. This data word includes the following informations: bit0 (ISS filter, 1 = ON, 0 = OFF) bit1 (ISS filter bandwidth, 1 = 80kHz, 0 = 120kHz) bit2 (MPOUT,1 = multipath present, 0 = no multipath) bit3 (1 = PLL is locked in , 0 = PLL is locked out). bit4 (fieldstrength indicator, 1 = lower as softmute threshold, 0 = higher as softmute threshold) bit5 (adjacent channel indicator, 1 = adjacent channel present, 0 = no adjacent channel) bit6 (deviation indicator, 1 = strong overdeviation present, 0 = no strong overdeviation) bit7 (deviation indicator, 1 = overdeviation present, 0 = no overdeviation)
2.
Software Specification
The interface protocol comprises: - start condition (S) - chip address byte - subaddress byte - sequence of data (N bytes + Acknowledge) - stop condition (P)
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2.1 ADDRESS ORGANIZATION Address Organization
Addr 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 7 LDENA PC7 PC15 TV1O7 TV2O7 LM EW2 TISS2 ACNTH1 MPAC BWCTL MENA F100K LPF DAGC3 DNB1 ODSW XTAL4 IF1T3 ODCUR OUT7 6 CURRH PC6 PC14 TV1O6 TV2O6 CASF EW1 TISS1 ACNTH0 APPM2 DTH1 SMD3 ACM3 AMON KAGC2 DAGC2 DNB0 AMIN XTAL3 IF1T2 ISSIN OUT6 TINACM 5 B1 PC5 PC13 TV1O5 TV2O5 IFCM1 EW0 TISS0 ACWTH2 APPM1 DTH0 SMD2 ACM2 RC2 KAGC1 DAGC1 DEM5 SMSL XTAL2 IF1T1 G1 TOUT OUT5 TINMP 4 B0 PC4 PC12 TV1O4 TV2O4 IFCM0 CF4 TVWB ACWTH1 MPTH1 DWTH1 SMD1 ACM1 RC1 KAGC0 DAGC0 DEM4 SL4 XTAL1 IF1T0 G0 TIN OUT4 TINAC OUT16 3 A3 PC3 PC11 TV1O3 TV2O3 IFENA CF3 AMD1 ISS30 ACWTH0 MPTH0 DWTH0 SMD0 ACM0 RC0 IFAGC1 WAGC3 DEM3 SL3 XTAL0 IF2T3 PH3 CLKSEP OUT3 OUT11 OUT15 2 A2 PC2 PC10 TV1O2 TV2O2 IFS2 CF2 AMD0 ISS80 ACG MPG TDEV2 SMTH2 ACMD1 VCOD2 IFAGC0 WAGC2 DEM2 SL2 IFG11 IF2T2 PH2 TEST3 OUT2 OUT10 OUT14 1 A1 PC1 PC9 TV1O1 TV2O1 IFS1 CF1 AMST ISSON ACF MPF TDEV1 SMTH1 ACMD0 VCOD1 RFAGC1 WAGC1 DEM1 SL1 IFG10 IF2T1 PH1 TEST2 OUT1 OUT9 OUT13 0 A0 PC0 PC8 TV1O0 TV2O0 IFS0 CF0 AMSEEK CTLOFF MPOFF TDEV0 SMTH0 SMCTH VCOD0 RFAGC0 WAGC0 DEM0 SL0 IFG2 IF2T0 PH0 TEST1 OUT0 OUT8 OUT12
Table 6.
Function CHARGEPUMP PLL COUNTER TV1 TV2 IFC CTRL 1 IFC CTRL 2 AM CTL QUALITYISS QUALITY AC QUALITY MP QUALITYDEV MUTE1 MUTE2 VCO/PLLREF FMAGC AMAGC DEM ADJ LEVEL IF1/XTAL TANK ADJ I/Q ADJ TESTCTRL1 TESTCTRL2 TESTCTRL3 TESTCTRL4
2.2
Control Register Function
Table 7.
Register Name A ACF ACG ACM ACMD ACNTH ACWTH AMD AMIN AMON AMSEEK Charge pump high current Adjacent channel filter select Adjacent channel filter gain Threshold for startpoint adjacent channel mute Adjacent channel mute depth Adjacent channel narrow band threshold Adjacent channel wide band threshold AM prescaler AM IF1 input select AM-FM switch Set short time constant of AGC in AM seek mode Function
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Table 7. (continued)
Register Name AMST APPM B BWCTL CASF CF CLKSEP CTLOFF CURRH DAGC DEM DNB DTH DWTH EW F100K G IF1T IF2T IFAGC IFCM IFENA IFG IFS ISSIN ISSON ISS30 ISS80 KAGC LDENA LM LPF MENA MPAC MPF MPG MPOFF MPTH ODCUR ODSW OUT PC PH AM stereo select Application mode quality detection Charge pump low current ISS filter fixed bandwith (ISS80) in automatic control Check alternative station frequency Center frequency IF counter Clock separation (only for testing) Switch off automatic control of ISS filter Set current high charge pump AM narrow band AGC threshold Demodulator offset Demodulator noise spike blanking Deviation detector threshold for ISS filter "OFF" Deviation detector threshold for ISS filter narrow/wide Frequency error window IF counter Corner frequency of AC-mute high pass filter I/Q mixer gain adjust FM/AM mixer1 tank adjust AM mixer2 tank adjust FM IF AGC IF counter mode IF counter enable IF1 amplifier gain (10.7MHz) IF counter sampling time Test input for ISS filter ISS filter "ON" ISS filter 30KHz weather band ISS filter narrow/mid switch FM keying AGC Lock detector enable Local mode FM seek stop Loop filter input select Softmute enable Adjacent channel control by multipath Multipath filter frequency Multipath filter gain Multipath control "OFF" Multipath threshold Current for overdeviation-correction Overdeviation-correction enable Test output (only for testing) Counter for PLL (VCO frequency) I/Q mixer phase adjust Function
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Table 7. (continued)
Register Name RC RFAGC SL SMCTH SMD SMSL SMTH TDEV TEST TIN TINAC TINACM TINMP TISS TOUT TVO TVWB VCOD WAGC XTAL Reference counter PLL FM RF AGC S meter slider Softmute capacitor threshold for ISS "ON" Softmute depth threshold S meter slope Softmute startpoint threshold Time constant for deviation detector Testing PLL/IFC (only for testing) Switch FSU PIN to TEST input (only for testing) Test input adjacent channel (only for testing) Test input adjacent channel mute (only for testing) Test input multipath(only for testing) Time constant for ISS filter "ON"/"OFF" Switch FSU PIN to Test output (only for testing) Tuning voltage offset for prestage Tuning voltage offset for prestage (weather band mode) VCO divider AM wide band AGC Xtal frequency adjust Function
2.2.1
Subaddress
Table 8.
MSB I A4 0 0 1 0 1 A3 0 0 0 A2 0 0 1 A1 0 0 0 LSB A0 0 1 1 Charge pump control PLL lock detector I/Q ADJ Page mode "OFF" Page mode enable Function
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2.3 2.3.1 DATA BYTE SPECIFICATION Addr 0 Charge Pump Control
Table 9.
MSB d7 d6 d5 d4 d3 0 0 0 0 1 0 0 1 1 0 1 0 1 0 1 0 1 d2 0 0 0 0 1 d1 0 0 1 1 1 LSB d0 0 1 0 1 1 High current = 0mA High current = 0.5mA High current = 1mA High current = 1.5mA High current = 7.5mA Low current = 0A Low current = 50A Low current = 100A Low current = 150A Select low current Select high current Lock detector disable Lock detector enable Function
2.3.2
Addr 1PLL Counter 1 (LSB)
Table 10.
MSB d7 0 0 0 1 1 1 1 d6 0 0 0 1 1 1 1 d5 0 0 0 1 1 1 1 d4 0 0 0 1 1 1 1 d3 0 0 0 1 1 1 1 d2 0 0 0 1 1 1 1 d1 0 0 1 0 0 1 1 LSB d0 0 1 0 0 1 0 1 LSB = 0 LSB = 1 LSB = 2 LSB = 252 LSB = 253 LSB = 254 LSB = 255 Function
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2.3.3 Addr 2 PLL Counter 2 (MSB)
Table 11.
MSB d7 0 0 0 1 1 1 1 d6 0 0 0 1 1 1 1 d5 0 0 0 1 1 1 1 d4 0 0 0 1 1 1 1 d3 0 0 0 1 1 1 1 d2 0 0 0 1 1 1 1 d1 0 0 1 0 0 1 1 LSB d0 0 1 0 0 1 0 1 MSB = 0 MSB = 256 MSB = 512 MSB = 64768 MSB = 65024 MSB = 65280 MSB = 65536 Function
Note: 1. Swallow mode: fVCO/fSYN = LSB + MSB + 32
2.3.4
ddr 3,4 TV1,2 (offset refered to tuning voltage PIN 28)
Table 12.
MSB d7 d6 0 0 0 0 1 1 d5 0 0 0 1 d4 0 0 0 1 d3 0 0 0 1 d2 0 0 0 1 d1 0 0 1 1 LSB d0 0 1 0 1 Tuning Voltage Offset = 0 TVO = 25mV TVO = 50mV TVO = 3175mV -TVO +TVO Function
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2.3.5 Addr 5 IF Counter Control 1
Table 13.
MSB d7 d6 d5 d4 d3 d2 0 0 0 0 1 1 1 1 0 1 0 0 1 1 0 1 0 1 0 1 0 1 d1 0 0 1 1 0 0 1 1 LSB d0 0 1 0 1 0 1 0 1 Function tSample = 20.48ms (FM)128ms (AM ) tSample = 10.24ms (FM)64ms (AM ) tSample = 5.12ms (FM)32ms (AM ) tSample = 2.56ms (FM)16ms (AM ) tSample = 1.28ms (FM)8ms (AM ) tSample = 640s (FM)4ms (AM ) tSample = 320s (FM)2ms (AM) tSample = 160s (FM)1ms (AM ) IF counter disable / stand by IF counter enable Not valid IF counter FM mode IF counter AM mode (450KHz) IF counter AM mode (10.7MHz) Disable mute & AGC on hold in FM mode Enable mute & AGC on hold in FM mode Disable local mode Enable local mode (PIN diode current = 0.5mA) "ON"
2.3.6
Addr 6 IF Counter Control 2
Table 14.
MSB d7 d6 d5 d4 0 0 0 0 0 0 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 d3 0 0 1 1 1 1 1 1 d2 0 0 0 1 1 1 1 1 d1 0 0 1 0 0 1 1 1 LSB Function d0 0 fCenter = 10.60625MHz (FM) / 10.689MHz ; 449KHz (AM) 1 1 0 1 0 1 1 fCenter = 10.61250MHz (FM) / 10.690MHz ; 450KHz (AM) fCenter = 10.67500MHz (FM) / 10.700MHz ; 460KHz (AM) fCenter = 10.68125MHz (FM) / 10.701MHz ; 461KHz (AM) fCenter = 10.68750MHz (FM) / 10.702MHz ; 462KHz (AM) fCenter = 10.69375MHz (FM) / 10.703MHz ; 463KHz (AM) fCenter = 10.70000MHz (FM) / 10.704MHz ; 464KHz(AM) fCenter = 10.80000MHz (FM) / 10.720MHz ;480KHz (AM) Not valid Not valid Not valid f = 6.25kHz (FM)1kHz (AM) f = 12.5kHz (FM) 2kHz (AM) f = 25kHz (FM) 4kHz (AM) f = 50kHz (FM) 8kHz (AM) f = 100kHz (FM)16kHz (AM)
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2.3.7 Addr 7 AM Control
Table 15.
MSB d7 d6 d5 d4 d3 d2 d1 LSB d0 0 1 0 1 0 0 1 1 0 1 0 1 Function Normal AGC time constant Short time constant for AM seek stop Multipath information available FM at PIN 34 AM stereo output available at PIN 34 Prescaler ratio 10 Prescaler ratio 8 Prescaler ratio 6 Prescaler ratio 4
2.3.8
Addr 8 Quality ISS Filter
Table 16.
MSB d7 d6 d5 d4 d3 d2 d1 LSB d0 0 1 0 1 0 1 0 1 0 1 0 0 0 0 1 0 0 1 1 1 0 1 0 1 1 ISS filter control "ON" ISS filter control "OFF" Switch ISS filter "OFF" Switch ISS filter "ON" Switch "OFF" ISS filter 120kHz Switch "ON" ISS filter 80kHz Switch "OFF" ISS filter 30KHz for weatherband Switch "ON" ISS filter 30KHz for weatherband Disable TV offset for weather band Enable TV offset for weather band (+4V) discharge current1A, charge current mid 74 narrow124 discharge current3A, charge current mid 72 narrow122 discharge current5A, charge current mid 70 narrow120 discharge current7A, charge current mid 68 narrow118 discharge current15A,charge current mid 60narrow110 Function
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2.3.9 Addr 9 Quality Detection Adjacent Channel
Table 17.
MSB d7 d6 d5 d4 d3 d2 d1 0 1 0 1 0 0 0 1 0 0 1 1 0 1 0 1 0 0 1 1 0 1 0 1 LSB d0 0/1 Not valid AC highpass frequency 100kHz AC bandpass frequency 100kHz AC gain 32dB AC gain 38dB AC wide band threshold 0.25V AC wide band threshold 0.35V AC wide band threshold 0.45V AC wide band threshold 0.95V AC narrow band threshold 0.0V AC narrow band threshold 0.1V AC narrow band threshold 0.2V AC narrow band threshold 0.3V Function
2.3.10 Addr 10 Quality Detection Multipath Table 18.
MSB d7 d6 d5 d4 d3 d2 d1 LSB d0 0 1 0 1 0 1 0 0 1 1 0 0 0 1 0 1 0 1 0 1 Multipath control "ON" Multipath control "OFF" MP bandpass frequency 19KHz MP bandpass frequency 31KHz MP gain 12dB MP gain 23dB MP threshold 0.50V MP threshold 0.75V MP threshold 1.00V MP threshold 1.25V Application mode 1 Application mode 2 Multipath eliminates ac Multipath eliminates ac and ac+ Function
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2.3.11 Addr 11 Quality Deviation Detection Table 19.
MSB d7 d6 d5 d4 d3 d2 0 0 0 0 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 d1 0 0 1 1 1 LSB d0 0 1 0 1 1 Function charge current 34, discharge current 6 charge current 32, discharge current 8 charge current 30, discharge current 10 charge current 28, discharge current 12 charge current 20, discharge current 20 DEV threshold for ISS narrow/wide 30kHz DEV threshold for ISS narrow/wide 45kHz DEV threshold for ISS narrow/wide 60kHz DEV threshold for ISS narrow/wide 75kHz 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 Disable ISS filter to fixed bandwith (ISS80) in automatic control Enable ISS filter to fixed bandwith (ISS80) in automatic control
2.3.12 Addr 12 Softmute Control 1 Table 20.
MSB d7 d6 d5 d4 d3 d2 0 0 1 0 0 0 0 1 0 1 0 0 0 0 1 0 0 1 1 1 0 1 0 1 1 d1 0 0 1 LSB d0 0 1 1 Function Startpoint mute 0 in application about 3dBV antenna level Startpoint mute 1in application about 4dBV antenna level Startpoint mute 7in application about 10dBV antenna level Mute depth 0 in application 18dB Mute depth 1 in application 20dB Mute depth 2 in application 22dB Mute depth 3 in application 24dB - (logarithmically behaviour) Mute depth 15 in application 36dB Mute disable Mute enable
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2.3.13 Addr 13 Softmute Control 2 Table 21.
MSB d7 d6 d5 d4 d3 d2 d1 LSB d0 0 1 0 0 1 1 0 0 0 0 1 0 1 0 0 0 1 1 0 0 1 1 1 0 1 0 1 1 0 1 0 1 Function Disable mute threshold for ISS filter "ON" Enable mute threshold for ISS filter "ON" AC mute depth 10dB AC mute depth 8dB AC mute depth 6dB AC mute depth 4dB AC mute threshold 60mV AC mute threshold 80mV AC mute threshold 100mV AC mute threshold 340mV AC mute "OFF" AC mute filter 110KHz AC mute filter 100KHz
2.3.14 Addr 14 VCODIV/PLLREF Table 22.
MSB d7 d6 d5 d4 d3 d2 d1 0 0 1 1 0 1 1 1 1 1 0 0 1 0 1 0 0 1 1 0 0 1 0 1 0 LSB d0 0 1 0 1 not valid (only for testing) VCO frequency divided by 2 VCO frequency divided by 3 original VCO frequency VCO" I" signal 0 degree VCO "I" signal 180 degree PLL reference frequency 50KHz PLL reference frequency 25KHz PLL reference frequency 10KHz PLL reference frequency 9KHz PLL reference frequency 2KHz Select FM mode Select AM mode Select PLL low pass filter FM Select PLL low pass filter AM Function
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2.3.15 Addr 15 FM AGC Table 23.
MSB d7 d6 d5 d4 d3 d2 d1 0 0 1 1 0 0 1 1 0 0 0 0 1 1 1 1 0 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1 LSB d0 0 1 0 1 Function RFAGC threshold V7-9TH= 85(77 ANT)dBV RFAGC threshold V7-9TH= 90(82 ANT)dBV RFAGC threshold V7-9TH= 94(86 ANT)dBV RFAGC threshold V7-9TH= 96(88 ANT)dBV IFAGC threshold V60TH= 86(60 ANT)dBV IFAGC threshold V60TH= 92(66 ANT)dBV IFAGC threshold V60TH= 96(70 ANT)dBV IFAGC threshold V60TH= 98(72 ANT)dBV KAGC threshold 80dBV KAGC threshold 82dBV KAGC threshold 84dBV KAGC threshold 86dBV KAGC threshold 88dBV KAGC threshold 90dBV KAGC threshold 92dBV Keying AGC "OFF" has to be "0"
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2.3.16 Addr 16 AM AGC Table 24.
MSB d7 d6 d5 d4 d3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 d2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 d1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 LSB d0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 Function WAGC V3TH= 90(65 ANT)dB V58TH= 90(60 ANT)dB WAGC V3TH= 94(69 ANT)dB V58TH= 94(64 ANT)dB WAGC V3TH= 97(72 ANT)dB V58TH= 96,5(66,5 ANT)dB WAGC V3TH= 98,5(73,5 ANT)dB V58TH= 98,5(68,5 ANT)dB WAGC V3TH= 100(75 ANT)dB V58TH= 100(70 ANT)dB WAGC V3TH= 101,5(76,5 ANT)dB V58TH= 101(71 ANT)dB WAGC V3TH= 102,5(77,5 ANT)dBV58TH= 102,5(72,5 ANT)dB WAGC V3TH= 103,5(78,5 ANT)dBV58TH= 103,5(73,5 ANT)dB WAGC V3TH= 104,5(79,5 ANT)dB V58TH= 104(74 ANT)dB WAGC V3TH= 105(80 ANT)dB V58TH= 105(75 ANT)dB WAGC V3TH= 106(81 ANT)dB V58TH= 105,5(75,5 ANT)dB WAGC V3TH= 106,5(81,5 ANT)dBV58TH= 106,5(76,5 ANT)dB WAGC V3TH= 107(82 ANT)dB V58TH= 107(77 ANT)dB WAGC V3TH= 108(83 ANT)dB V58TH= 107,5(77,5 ANT)dB WAGC V3TH= 108,5(83,5 ANT)dB V58TH= 108(78 ANT)dB WAGC V3TH= 109(84 ANT)dB V58TH= 108,5(78,5 ANT)dB DAGC V58TH= 74(44 ANTENNA)dB DAGC V58TH= 77(47 ANTENNA)dB DAGC V58TH= 79(49 ANTENNA)dB DAGC V58TH= 80,5(50,5 ANTENNA)dB DAGC V58TH= 82(52 ANTENNA)dB DAGC V58TH= 83,5(53,5 ANTENNA)dB DAGC V58TH= 85(55 ANTENNA)dB DAGC V58TH= 86,5(56,5 ANTENNA)dB DAGC V58TH= 88(58 ANTENNA)dB DAGC V58TH= 89(59 ANTENNA)dB DAGC V58TH= 90(60 ANTENNA)dB DAGC V58TH= 91(61 ANTENNA)dB DAGC V58TH= 92(62 ANTENNA)dB DAGC V58TH= 93(63 ANTENNA)dB DAGC V58TH= 94(64 ANTENNA)dB DAGC V58TH= 96(66 ANTENNA)dB
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2.3.17 Addr 17 FM Demodulator Fine Adjust Table 25.
MSB d7 d6 d5 0 0 0 0 1 1 1 1 0 0 1 1 0 1 0 1 d4 0 0 0 1 0 0 0 1 d3 0 0 0 1 0 0 0 1 d2 0 0 0 1 0 0 0 1 d1 0 0 1 1 0 0 1 1 LSB d0 0 1 0 1 0 1 0 1 0mV +8.5mV +17mV +263.5mV 0mV -8.5mV -17mV -263.5mV Spike cancelation "OFF" Threshold for spike cancelation 270mV Threshold for spike cancelation 520mV Threshold for spike cancelation 750mV Function
2.3.18 Addr 18 S-Meter Slider Table 26.
MSB d7 d6 d5 d4 d3 0 0 0 1 0 1 0 1 0 1 0 1 d2 0 0 0 1 d1 0 0 1 1 LSB d0 0 1 0 1 S meter offset SL=1dB S meter offset SL=2dB S meter offset SL=15dB S meter offset -SL S meter offset +SL S Meter slope 1V/decade S meter slope 1.5V/decade Select external AM-IF input Select internal AM-IF input Overdeviation correction "ON" Overdeviation correction "OFF" Function S meter slider offset SL=0dB
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2.3.19 Addr 19 IF GAIN/XTAL Adjust Table 27.
MSB d7 d6 d5 d4 d3 d2 d1 LSB d0 0 1 0 0 1 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1 IF1 gain2 9dB IF1 gain2 11dB IF1 gain1 9dB IF1 gain1 11dB IF1 gain1 12dB IF1 gain1 15dB CLoad 0pF CLoad 0.75pF CLoad 1.5pF CLoad 2.25pF CLoad 3pF CLoad 23.25pF Function
2.3.20 Addr 20 Tank Adjust Table 28.
MSB d7 d6 d5 d4 d3 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 1 1 1 0 1 0 1 1 d2 0 0 0 0 1 d1 0 0 1 1 1 LSB d0 0 1 0 1 1 450kHz 0pF 450kHz 1.6pF 450kHz 3.2pF 450kHz 4.8pF 450kHz 24pF 10.7MHz 0pF 10.7MHz 0.55pF 10.7MHz 1.1pF 10.7MHz 1.65pF 10.7MHz 8.25pF Function
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2.3.21 Addr 21 I/Q FM mixer1 adjust Table 29.
MSB d7 d6 d5 d4 d3 0 0 0 0 1 1 1 0 0 1 1 x 0 1 0 1 0 1 d2 0 0 0 1 0 0 1 d1 0 0 1 1 0 0 1 LSB d0 0 1 0 1 0 1 1 -7 degree -6 degree -5 degree 0 degree +1 degree +2 degree +8degree 0% -1% +1% 0% not used Overdeviation correction current max=45A Overdeviation correction current max=90A Function
2.3.22 Addr 22 Test Control 1 Table 30.
MSB d7 x d6 x d5 x d4 x d3 x d2 x d1 x LSB d0 x Function Only for testing ( have to be set to 0)
2.3.23 Addr 23 Test Control 2 Table 31.
MSB d7 x d6 x d5 x d4 x d3 x d2 x d1 x LSB d0 x Function Only for testing ( have to be set to 0)
2.3.24 Addr 24 Test Control 3 Table 32.
MSB d7 x d6 x d5 x d4 x d3 x d2 x d1 x LSB d0 x Function Only for testing ( have to be set to 0)
2.3.25 Addr25 Test Control 4 Table 33.
MSB d7 x d6 x d5 x d4 x d3 x d2 x d1 x LSB d0 x Function Only for testing ( have to be set to 0)
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3. APPENDIX
Figure 1. Block diagram I/Q mixer
Figure 2. Block diagram VCO
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Figure 3. Block diagram keying AGC
5.7V
Figure 4. Block diagram ISS function
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Block Diagram Quality Detection Principle (without overdeviation correction) Table 34.
Signal ac ac+ sm dev dev+ inton int80 LOW No adjacent channel No strong adjacent channel Fieldstrength higher as softmute threshold Deviation lower as threshold DWTH Deviation lower as threshold DTH*DWTH ISS filter off by logic (wide) ISS filter 120kHz (mid) 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)
Table 35.
Input Signals
ac ac+ sm dev dev+ inton
Mode1
int80 Function inton
Mode2
int80 Function
0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1
0 0 0 0 0 0 0 1 0 1 0 1 0 1 0 1
0 0 0 1 1 1 0 0 0 0 1 1 1 1 1 1
0 1 1 0 1 1 0 0 1 1 0 0 1 1 1 1
0 0 1 0 0 1 0 0 0 1 0 0 0 0 1 1
0 0 0 1 0 0 1 1 1 1 1 1 1 1 1 1
0 0 0 1 0 0 1 1 0 0 1 1 0 0 0 0
wide wide wide narrow wide wide narrow narrow mid mid narrow narrow mid mid mid mid
0 0 0 1 1 0 1 1 1 1 1 1 1 1 1 1
0 0 0 1 0 0 0 1 0 1 1 1 0 1 0 1
wide wide wide narrow mid wide mid narrow mid narrow narrow narrow mid narrow mid narrow
Part List (Application- and Measurment Circuit) Table 36.
Item F1 F2 F3 F4 F5 L1 L2,L4 L3,L8 L5 Description TOKO 5KG 611SNS-A096GO TOKO 5KM 396INS-A467AO TOKO MC152 E558HNA-100092 TOKO 7PSG 826AC-A0022EK=S TOKO PGL 5PGLC-5103N TOKO FSLM 2520-150 15H TOKO FSLM 2520-680 68H SIEMENS SIMID03 B82432 1mH TOKO LL 2012-220
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Table 36. (continued)
Item L6 L7 CF1,CF2 CF3 CF4 D1 D2,D3 D4 D5 Q1 Description TOKO LL 2012-270 TOKO LL 2012-22.0 muRata SFE10.7MS3A10-A 180KHz or (TOKO CFSK107M3-AE-20X) muRata SFE10.7MJA10-A 150KHz or (TOKO CFSK107M4-AE-20X) muRata SFPS 450H 6KHz or (TOKO ARLFC450T) TOSHIBA 1SV172 TOKO KP2311E TOKO KV1370NT PHILIPS BB156 TOSHIBA HN3G01J
Figure 5.
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4.0 Application notes
Following items are important to get highest performance of TDA7512 in application: 1. In order to avoid leakage current from PLL loop filter input to ground a guardring is recommended around loop filter PIN's with PLL reference 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. 3. Blocking of VCO supply should be near at PIN 16 and PIN 17. 4. Wire lenght to FM mixer1 input and output should be symetrically and short. 5. FM demodulator capacitance at PIN 44 should be sense connected as short as possible versus demodulator ground at PIN 47. 6. With respect to THD capacitive coupling from PIN 20 to VCO should be avoided. Capacitance at PIN 20 has be connected versus VCC2 ground. 7. Wire lenght from AM mixer tank output to 9KHz ceramic filter input has to be short as possible.
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DIM. MIN. A A1 A2 B C D D1 D3 e E E1 E3 L L1 K 0.40 0.05 1.35 0.18 0.12
mm TYP. MAX. 1.60 0.15 1.40 0.23 0.16 12.00 10.00 7.50 0.50 12.00 10.00 7.50 0.60 1.00 0(min.), 7(max.) 0.75 1.45 0.28 0.20 0.002 0.053 0.007 MIN.
inch TYP. MAX. 0.063 0.006 0.055 0.009 0.057 0.011
OUTLINE AND MECHANICAL DATA
0.0047 0.0063 0.0079 0.472 0.394 0.295 0.0197 0.472 0.394 0.295 0.0157 0.0236 0.0295 0.0393
TQFP64
D D1 A D3 A1 48 49 33 32
0.10mm Seating Plane
A2
B
E3
E1
64 1 e 16
17 C
L1
E
L
K
TQFP64
B
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Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners (c) 2003 STMicroelectronics - All rights reserved STMicroelectronics GROUP OF COMPANIES 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 www.st.com
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