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1/42 TDA7512 september 2003 this is preliminary information on a new product now in development or undergoing evaluation. details are subject to change wit hout notice. fm-part n rf agc generation by rf and if detection n i/q mixer for 1st fm if 10.7mhz with image rejection n 2 programmable if-gain stages n mixer for 2 nd if 450khz n internal 450khz bandpass filter with three bandwidths controlled by iss n fully integrated fm-demodulator with noise cancellation am-part n wide and narrow agc generation n preamplifier and mixer for 1st if 10.7mhz, am upconversion n mixer for 2 nd if 450khz n integrated am-demodulator n output for am-stereo-decoder additional features n vco for world tuning range n high performance fast pll for rds- system n if counter for fm and am with search stop signal n quality detector for level, deviation, adjacent channel and multipath n quality detection informations as analog signals external available n iss (intelligent selectivity system) for cancellation of adjacent channel and noise influences n adjacent channel mute n fully electronic alignment n all functions i 2 c-bus controlled n iss filter status information i 2 c-bus readable description the TDA7512 is a high performance tuner circuit for am/fm car radio. it contains mixer, if amplifier, de- modulator for am and fm, quality detection, iss filter and pll synthesizer with if counter on a single chip. use of bicmos technology allows the implementa- tion of several tuning functions and a minimum of ex- ternal components. tqfp64 ordering number: TDA7512 preliminary data am/fm car radio tuner ic with intelligent selectivity system (iss)
TDA7512 2/42 block diagram
3/42 TDA7512 pin connection (top view) pin description n pin name function 1 ammix1in2 am input2 mixer1 2 ammix1in1 am input1 mixer1 3 amrfagcin input am rf agc 4 amrfagcout output am rf agc 5 ampindr am pin diode driver output 6 fmpindr fm pin diode driver output 7 fmmix1in1 fm input1 mixer1 8 gndrf rf ground 9 fmmix1in2 fm input2 mixer1 10 fmagctc fm agc time constant 11 tv1 tuning voltage preselection1 12 tv2 tuning voltage preselection2 13 adjch ident. adjacent channel output 1 2 3 5 6 4 7 8 9 10 27 11 28 29 30 31 32 59 58 57 56 54 55 53 52 51 50 49 43 42 41 39 38 40 48 47 46 44 45 fmpindr ampindr amrfagcout ammix1in1 ammix1in2 amrfagcin tv1 fmagctc fmmix1in2 fmmix1in1 gndrf xtald gndvcc3 sstop sda vcc3 scl lpout vref2 lpam lpfm lphc gndif1 amif1in/iss fmamp1in ammix2out1 fmamp1out ammix2out2 fmif1ref fmamp2in vcc2 fmamp2out gndvcc2 amif2in mutetc amdetc amifbpf amifref amagc2tc vref1 gnddem fmmix2in1 refdemc fm/am fmmix2in2 tqfp64 22 23 24 25 26 60 fmif1agcin 61 vccif1 62 amrfagctc 63 mix1out2 64 mix1out1 gndvco vcob vcoe devtc xtalg 17 18 19 20 21 37 36 34 33 35 mpx/afam vcc1 amst/mp gndvcc1 fsw 12 13 14 15 16 vccvco isstc fsu tv2 adjch
TDA7512 4/42 14 fsu unweighted fieldstrength output 15 isstc time constant for iss filter switch 16 vccvco vco supply 17 gndvco vco ground 18 vcob vco input base 19 vcoe vco output emitter 20 devtc deviation detector time constant 21 xtalg xtal oscillator to mos gate 22 xtald xtal oscillator to mos drain 23 gndvcc3 vcc3 ground 24 sstop search stop output 25 sda i 2 c-bus data 26 scl i 2 c-bus clock 27 vcc3 supply tuning voltage 28 lpout op amp output to pll loop filters 29 vref2 voltage reference for pll op amp 30 lpam op amp input to pll loop filters am 31 lpfm op amp input to pll loop filters fm 32 lphc high current pll loop filter input 33 gndvcc1 digital ground 34 amst/mp am stereo out / ident. multipath output 35 fsw weighted fieldstrength output 36 vcc1 digital supply 37 mpx/afam mpx output / am af output 38 amifref reference voltage am if amp 39 amifbpf am if filter 40 amagc2tc am agc2 time constant 41 amdetc am detector capacitor 42 mutetc softmute time constant 43 amif2in input am if2 44 refdemc fm/am demodulator reference fm/am 45 fmmix2in2 fm if1 mix2 input1 pin description (continued) n pin name function
5/42 TDA7512 thermal data absolute maximum ratings 46 fmmix2in1 fm if1 mix2 input2 47 gnddem ground fm demodulator 48 vref1 reference 5v 49 gndvcc2 analog ground 50 fmamp2out fm if1 amplifier2 output 51 vcc2 analog supply 52 fmamp2in fm if1 amplifier2 input 53 fmif1ref fm if1 amplifier reference 54 fmamp1out fm if1 amplifier1 output 55 ammix2out2 am tank 450khz 56 ammix2out1 am tank 450khz 57 fmamp1in fm if1 amplifier1 input 58 amif1in/iss am if1 input/iss filter status 59 gndif1 fm if1 ground 60 fmif1agcin fm if1 agc input 61 vccif1 if1 supply 62 amrfagctc am rf agc time constant 63 mix1out2 mix tank 10.7mhz 64 mix1out1 mix tank 10.7mhz table 1. symbol parameter value unit r th(j-a) thermal resistance junction to ambient 68 max. c/w table 2. symbol parameter value unit v s supply voltage 10.5 v t amb ambient temperature -40 to 85 c t stg storage temperature -55 to +150 c pin description (continued) n pin name function
TDA7512 6/42 table 3. electrical characteristics t amb = +25c, v cc1 = v cc2 = v cc3 = v ccvco = v ccmix1 = v ccif1 =8.5v, f rf = 98mhz, dev. = 40khz, f mod =1khz, f if1 =10.7mhz, f if2 =450khz, f xtal = 10.25mhz, in application circuit, unless otherwise specified. symbol parameter test condition min. typ. max. unit supply v cc1 digital supply voltage 7.5 8.5 10 v v cc2 analog supply voltage 7.5 8.5 10 v v cc3 analog tuning voltage 7.5 8.5 10 v v ccvco vco supply voltage 7.5 8.5 10 v v ccmix1 mix1 supply voltage 7.5 8.5 10 v v ccmix2 mix2 supply voltage 7.5 8.5 10 v v ccif1 if1 supply voltage 7.5 8.5 10 v i cc1 supply current fm on 7.5 ma i cc1 supply current am on 10 ma i cc2 supply current fm on / vco:3 70 ma i cc2 supply current am on 70 ma i cc3 supply current 2 ma i ccvco supply current 9 ma i ccmix1 supply current fm on 8 ma i ccmix1 supply current am on 7 ma i ccmix2 supply current am on 7 ma i ccif1 supply current 6 ma reference voltages v ref1 internal reference voltage i ref1 = 0ma 5 v v ref2 internal reference voltage i ref2 = 0ma 2.5 v wide band rf agc v 7-9 lower threshold start v 10 = 2.5v 85 db m v v 7-9 upper threshold start v 10 = 2.5v 96 db m v narrow band if & keying agc v 60 lower threshold start kagc = off, v 7-9 = 0mv rms 86 db m v v 60 upper threshold start kagc = off, v 7-9 = 0mv rms 98 db m v
7/42 TDA7512 v 60 lower threshold start with kagc kagc = max, v 7-9 = 0mv rms, d f if =300khz 98 db m v v 35 startpoint kagc kagc = max, v 7-9 = 0mv rms, d f if =300khz f if1 generate fsw level at v 35 3.6 v d control range kagc d v 35 = +0.4v 16 db r in input resistance 10 k w c in input capacitance 2.5 pf agc time constant output v 10 max. agc output voltage v 7-9 = 0mv rms v ref1 +v be v v 10 min. agc output voltage v 7-9 = 50mv rms 0.5 v i 10 min. agc charge current v 7-9 = 0mv rms ,v 10 = 2.5v -12.5 m a i 10 max. agc discharge current v 7-9 = 50mv rms ,v 10 = 2.5v 1.25 ma agc pin diode driver output i 6 agc out, current min. v 7-9 = 0mv rms , v 6 = 2.5v 50 m a i 6 agc out, current max. v 7-9 = 50 mv rms , v 6 = 2.5v -20 ma i/q mixer1 (10.7mhz) r in input resistance differential 10 k w c in input capacitance differential 4 pf r out output resistance differential 100 k w v 7,9 input dc bias 3.2 v g m conversion transconductance 17 ms f noise figure 400 w generator resistance 3db cp 1db 1db compression point referred to diff. mixer input 100 db m v iip3 3rd order intermodulation 122 db m v iqg i/q gain adjust g -1 +1 % iqp i/q phase adjust ph -7 +8 deg irr image rejection ratio ratio wanted/image 30 40 db irr image rejection ratio with gain and phase adjust 40 46 db table 3. electrical characteristics (continued) t amb = +25c, v cc1 = v cc2 = v cc3 = v ccvco = v ccmix1 = v ccif1 =8.5v, f rf = 98mhz, dev. = 40khz, f mod =1khz, f if1 =10.7mhz, f if2 =450khz, f xtal = 10.25mhz, in application circuit, unless otherwise specified. symbol parameter test condition min. typ. max. unit
TDA7512 8/42 if1 amplifier1 +2 (10.7mhz) g min min. gain ifg 18 db g max max. gain ifg 26 db r in input resistance 330 w r out output resistance 330 w cp 1db 1db compression point referred to 330 w input 105 db m v iip3 3rd order intermodulation referred to 330 w input 126 db m v mixer2 (450khz) r in input impedance 330 w v 46 max. input voltage 900 mv rm s v 48 limiting sensitivity s/n = 20db 25 m v g mixer gain 18 db limiter 1 (450khz) g limiter gain 80 db demodulator, audio output thd dev.= 75khz, v 46 = 10mv rms 0.1 % v mpx mpx output signal dev.= 75khz 500 mv rm s r out output resistance 50 w | d v| min dc offset fine adjust dem, mena=1 8.5 mv | d v| max dc offset fine adjust dem, mena=1 264 mv s/n dev.= 40khz,v 46 = 10mv rms 76 db quality detection s-meter, unweighted fieldstrength v 46 min. input voltage mix2 10 m v v 14 fieldstrength output v 46 = 0v rms 0.1 v v 14 fieldstrength output v 46 = 1v rms 4.9 v d v 14 voltage per decade smsl = 0 1 v d v 14 voltage per decade smsl = 1 1.5 v table 3. electrical characteristics (continued) t amb = +25c, v cc1 = v cc2 = v cc3 = v ccvco = v ccmix1 = v ccif1 =8.5v, f rf = 98mhz, dev. = 40khz, f mod =1khz, f if1 =10.7mhz, f if2 =450khz, f xtal = 10.25mhz, in application circuit, unless otherwise specified. symbol parameter test condition min. typ. max. unit
9/42 TDA7512 d v 14 s-meter offset sl, smsl=1 -15 15 db r out output resistance 200 w tk temp coeff. 0 ppm/k s-meter, weighted fieldstrength v 35 fieldstrength output v 46 = 0v rms 2.5 v v 35 fieldstrength output v 46 = 1v rms 4.9 v r out output resistance 12 k w adjacent channel gain g min gain minimum acg=0 32 db g max gain maximum acg=1 38 db adjacent channel filter f hp -3db frequency highpass acf=0 100 khz f bp centre frequency acf=1 100 khz f -20db attenuation 20db 70 khz adjacent channel output v 13 output voltage low 0.1 v v 13 output voltage high 4.9 v r out output resistance 4 k w multipath channel gain g min gain minimum mpg=0 12 db g max gain maximum mpg=1 23 db multipath bandpass filter f lower centre frequency low mpf=0 19 khz f upper centre frequency up mpf=1 31 khz q quality factor 5 10 multipath output v 34 output voltage low 0.1 v v 34 output voltage high 4.9 v r out output resistance 2.5 k w table 3. electrical characteristics (continued) t amb = +25c, v cc1 = v cc2 = v cc3 = v ccvco = v ccmix1 = v ccif1 =8.5v, f rf = 98mhz, dev. = 40khz, f mod =1khz, f if1 =10.7mhz, f if2 =450khz, f xtal = 10.25mhz, in application circuit, unless otherwise specified. symbol parameter test condition min. typ. max. unit
TDA7512 10/42 iss (intelligent selectivity system) filter 450khz f centre centre frequency f ref_intern = 450khz 450 khz bw 3db bandwidth, -3db iss80 = 1 80 khz bw 20db bandwidth, -20db iss80 = 1 150 khz bw 3db bandwidth, -3db iss80 = 0 120 khz bw 20db bandwidth, -20db iss80 = 0 250 khz bw 3db bandwidth weather band iss30 = 1 30 khz bw 20db -20db weather band iss30 = 1 80 khz adjacent channel iss filter threshold v nth internal low threshold acnth 0 v v nth internal high threshold acnth 0.3 v v wth internal low threshold acwth 0.25 v v wth internal high threshold acwth 0.95 v multipath threshold v thmp internal low threshold mpth 0.50 v v thmp internal high threshold mpth 1.25 v iss filter time constant i 15 charge current low mid tiss, issctl = 1 -74 m a i 15 charge current high mid tiss, issctl = 1 -60 m a i 15 charge current low narrow tiss, issctl = 1 -124 m a i 15 charge current high narrow tiss, issctl = 1 -110 m a i 15 discharge current low tiss, issctl = 0 1 m a i 15 discharge current high tiss, issctl = 0 15 m a v 15 low voltage issctl = 0 0.1 v table 3. electrical characteristics (continued) t amb = +25c, v cc1 = v cc2 = v cc3 = v ccvco = v ccmix1 = v ccif1 =8.5v, f rf = 98mhz, dev. = 40khz, f mod =1khz, f if1 =10.7mhz, f if2 =450khz, f xtal = 10.25mhz, in application circuit, unless otherwise specified. symbol parameter test condition min. typ. max. unit
11/42 TDA7512 v 15 high voltage issctl = 1 4.9 v iss filter switch threshold v 15 threshold iss on issctl = 0 3 v v 15 threshold iss off issctl = 0 1 v v 15 threshold iss narrow on issctl = 0 4 v v 15 threshold iss narrow off issctl = 0 2 v i 20 charge current low tdev -20 m a i 20 charge current high tdev -34 m a i 20 discharge current low tdev 6 m a i 20 discharge current high tdev 20 m a dev wth internal low threshold dwth 30 khz dev wth internal high threshold dwth 75 khz ratio mi n referred to threshold dth 1 ratio m ax referred to threshold dth 1.5 softmute v ant upper startpoint smth, smd, slope = 0 10 db m v v ant lower startpoint smth, smd, slope = 0 3 db m v a smmin min. softmute depth smd, slope = 0, smth upper 18 db a smmax max. softmute depth smd, slope = 0, smth upper 36 db a smthis s mute depth threshold for iss filter on smcth 0.2 2 db v acth internal ac mute threshold acm 60 340 mv a smac ac mute depth acmd 4 10 db i 42 charge current -47.5 m a i 42 discharge current 2.5 m a s/n over all s/n v ant_min = 60db m v, dev.= 40khz,lp=15khz deemphasis t = 50 m s 66 db table 3. electrical characteristics (continued) t amb = +25c, v cc1 = v cc2 = v cc3 = v ccvco = v ccmix1 = v ccif1 =8.5v, f rf = 98mhz, dev. = 40khz, f mod =1khz, f if1 =10.7mhz, f if2 =450khz, f xtal = 10.25mhz, in application circuit, unless otherwise specified. symbol parameter test condition min. typ. max. unit
TDA7512 12/42 table 4. electrical characteristics t amb = +25c, v cc1 = v cc2 = v cc3 = v ccvco = v ccmix1 = v ccmix2 =8.5v, f rf =1mhz, f mod = 400hz at 30% amf if1 = 10.7mhz, f if2 =450khz, f xtal = 10.25mhz, in application circuit, (unless otherwise noted, v inrf antenna input). symbol parameter test condition min. typ. max. unit global v ant min max. sensitivity ref.: v inrf = 60db m v, 19 db m v v ant us usable sensitivity (s+n)/n = 20 db 30 26 db m v d v ant if2 agc range ref.: v inrf = 60db m v, 56 db (s+n)/n signal to noise ratio ref.: v inrf = 60ddb m v 50 60 db a if if rejection ref: v inrf = 60db m v, if1 = 10.7mhz if2 = 450khz 100 100 db db f af frequency response ref.: v inrf = 60db m v, d v af = -3 db 3.6 khz thd total harmonic distortion v inrf = 60db m v, m = 0.8 m = 0.3 v inrf = 120 db m v, m = 0.8 m = 0.3 0.5 0.3 1.0 0.3 % v 37 output level v inrf = 60db m v 220 mv rm s v 34 output level v inrf = 60db m , m=off 190 mv rm s v 3 min. rf agc threshold max. rf agc threshold wagc 90 109 db m v db m v v 58 min. if agc threshold max. if agc threshold wagc 90 109 db m v db m v v 58 min. dagc threshold max. dagc threshold dagc 74 96 db m v db m v | i 40max | agc2 charge current seek 160 m a ccr charge current ratio seek/seek off 30 agc voltage driver output v 4 max. agc output voltage 3.5 v v 4 min. agc output voltage 0.5 v | i 4 | agc current 100 m a agc pin diode driver output i 5 agc driver current -2 ma
13/42 TDA7512 am mixer1 (10.7mhz) r in input resistance differential 1.2 k w c in input capacitance differential 4 pf r out output impedance differential 100 k w cp 1db 1db compression point referred to diff. mixer input 115 db m v iip3 3rd order intermodulation 132 db m v f noise figure 8db a gain 26 db c min min. capacitance step if1t 0.55 pf c max max. capacitance if1t 8.25 pf c 31-64 if1t 2 pf am mixer2 (450khz) r 58 input resistance 10 k w c 58 input capacitance 2.5 pf cp 1db 1db compression point referred to diff. mixer input 120 db m v iip3 3rd order intermodulation 132 db m v f noise figure 12 db a max. gain mixer2 tank output 34 db d a gain control range 20 db c min min. cap step if2t 1.6 pf c max max. cap if2t 24 pf c 55-56 if2t 2 pf table 4. electrical characteristics (continued) t amb = +25c, v cc1 = v cc2 = v cc3 = v ccvco = v ccmix1 = v ccmix2 =8.5v, f rf =1mhz, f mod = 400hz at 30% amf if1 = 10.7mhz, f if2 =450khz, f xtal = 10.25mhz, in application circuit, (unless otherwise noted, v inrf antenna input). symbol parameter test condition min. typ. max. unit
TDA7512 14/42 table 5. additional parameters symbol parameter test condition min. typ. max. unit output of tuning voltages (tv1,tv2) v out output voltage tvo 0.5 v cc3 - 0.5 v r out output impedance 20 k w xtal reference oscillator f lo reference frequency c load = 15pf 10.25 mhz c step min. cap step xtal 0.75 pf c max max. cap xtal 23.25 pf d f/f deviation versus vcc2 d v cc2 = 1v 1.5 ppm/v d f/f deviation versus temp -40c < t < +85c 0.2 ppm/k i 2 c-bus interface f scl clock frequency 400 khz v il input low voltage 1v v ih input high voltage 3 v i in input current -5 5 m a v o output acknowledge voltage i o = 1.6ma 0.4 v loop filter input/output -i in input leakage current v in = gnd, pd out = tristate -0.1 0.1 m a i in input leakage current v in = vref1 pd out = tristate -0.1 0.1 m a v ol output voltage low i out = -0.2ma 0.05 0.5 v v oh output voltage high i out = 0.2ma v cc3 - 0.5 v cc3 - 0.05 v i out output current, sink v out = 1v to v cc3 -1v 10 ma i out output current, source v out = 1v to v cc3 -1v -10 ma voltage controlled oscillator (vco) f vcomin minimum vco frequency 50 mhz f vcomax maximum vco frequency 260 mhz c/n carrier to noise f vco = 200mhz, d f=1khz, b=1hz, closed loop 80 dbc sstop output (open collector) v 24 output voltage low i 24 = -200 m a 0.2 0.5 v v 24 output voltage high 5v -i 24 output leakage current v 24 = 5v -0.1 0.1 m a i 24 output current, sink v 24 = 0.5v-5v 1 ma
15/42 TDA7512 1. functional description 1.1 fm section 1.2 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 C us fm = 87.9 to 107.9 mhz C us weather = 162.4 to 162.55 mhz C europe fm = 87.5 to 108 mhz C japan fm = 76 to 91 mhz C 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 con- trolled current for double pin diode attenuator. two 10.7mhz programmable amplifiers (ifg1, ifg2) correct the if ceramic insertion loss and the costumer lev- el 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 quality detection and iss 1.4.1 fieldstrength parallel to mixer2 input a 10.7mhz limiter generates a signal for digital if counter and a fieldstrength output sig- nal. 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 programma- ble 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 chan- nel 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 i 2 c 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 band- pass (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 i 2 c bus (mpoff). the multipath information is available as analog output signal after rectifier and +8db output buffer.
TDA7512 16/42 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 fre- quency 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 pro- grammable comparator3 thresholds (dwth, dth) and generates two digital signals (dev, dev+). for weak sig- nal 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 switch- ing 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 informa- tion 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 volt- age 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 imped- ance. 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).
17/42 TDA7512 1.7 pll and if counter section 1.7.1 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 frequen- cies via an i 2 c-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 i 2 c 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 b- divider. the 11-bit pc register (pc5 to pc15) controls this divider dividing range: f vco = [33 x a + (b + 1 - a) x 32] x f ref f vco = (32 x b + a + 32) x f ref important: for correct operation: a 32; b 3 a 1.7.3 three state phase comparator the phase comparator generates a phase error signal according to phase difference between f syn and f ref . 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 i 2 c-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
TDA7512 18/42 narrow filtered if2 before demodulation. a switch controlled by if counter mode (ifcm) is chosing the input sig- nal 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 (t tim =160 m s) and in am mode 1khz (t tim =1ms). this is followed by an asynchronous divider to gener- ate 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 (t sample xf if ). 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 fre- quency range inside which a successful count result is adjustable by the ew bits. t cnt = (cf + 1696+1) / f if fm mode t cnt = (cf + 10688+1) / f if am up conversion mode t cnt = (cf + 488+1) / f if am mode counter result succeeded: t tim 3 t cnt - t err t tim t cnt + t err counter result failed: t tim > t cnt + t err t tim < t cnt - t err t tim = if timer cycle time (sampling time) t cnt = if counter cycle time t err = 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.
19/42 TDA7512 1.8 i 2 c-bus interface the TDA7512 supports the i 2 c-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 trans- mit 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 con- tinuously monitors the sda and scl lines for a valid start and will not response to any command if this con- dition 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 de- vice 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 prop- er 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, fol- lowed 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 doesnt 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: C when set to "1", a read operation is selected C 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 "acknowl- edge" 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
TDA7512 20/42 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: C start condition (s) C chip address byte C subaddress byte C sequence of data (n bytes + acknowledge) C stop condition (p)
21/42 TDA7512 2.1 address organization 2.2 control register function table 6. address organization function addr 7 6543210 chargepump 0 ldena currh b1 b0 a3 a2 a1 a0 pll counter 1 pc7 pc6 pc5 pc4 pc3 pc2 pc1 pc0 2 pc15 pc14 pc13 pc12 pc11 pc10 pc9 pc8 tv1 3 tv1o7 tv1o6 tv1o5 tv1o4 tv1o3 tv1o2 tv1o1 tv1o0 tv2 4 tv2o7 tv2o6 tv2o5 tv2o4 tv2o3 tv2o2 tv2o1 tv2o0 ifc ctrl 1 5 lm casf ifcm1 ifcm0 ifena ifs2 ifs1 ifs0 ifc ctrl 2 6 ew2 ew1 ew0 cf4 cf3 cf2 cf1 cf0 am ctl 7 - - - - amd1 amd0 amst amseek qualityiss 8 tiss2 tiss1 tiss0 tvwb iss30 iss80 isson ctloff quality ac 9 acnth1 acnth0 acwth2 acwth1 acwth0 acg acf - quality mp 10 mpac appm2 appm1 mpth1 mpth0 mpg mpf mpoff qualitydev 11 bwctl dth1 dth0 dwth1 dwth0 tdev2 tdev1 tdev0 mute1 12 mena smd3 smd2 smd1 smd0 smth2 smth1 smth0 mute2 13 f100k acm3 acm2 acm1 acm0 acmd1 acmd0 smcth vco/pllref 14 lpf amon rc2 rc1 rc0 vcod2 vcod1 vcod0 fmagc 15 - kagc2 kagc1 kagc0 ifagc1 ifagc0 rfagc1 rfagc0 amagc 16 dagc3 dagc2 dagc1 dagc0 wagc3 wagc2 wagc1 wagc0 dem adj 17 dnb1 dnb0 dem5 dem4 dem3 dem2 dem1 dem0 level 18 odsw amin smsl sl4 sl3 sl2 sl1 sl0 if1/xtal 19 xtal4 xtal3 xtal2 xtal1 xtal0 ifg11 ifg10 ifg2 tank adj 20 if1t3 if1t2 if1t1 if1t0 if2t3 if2t2 if2t1 if2t0 i/q adj 21 odcur - g1 g0 ph3 ph2 ph1 ph0 testctrl1 22 - issin tout tin clksep test3 test2 test1 testctrl2 23 out7 out6 out5 out4 out3 out2 out1 out0 testctrl3 24 - tinacm tinmp tinac out11 out10 out9 out8 testctrl4 25 - - - out16 out15 out14 out13 out12 table 7. register name function a charge pump high current acf adjacent channel filter select acg adjacent channel filter gain acm threshold for startpoint adjacent channel mute acmd adjacent channel mute depth acnth adjacent channel narrow band threshold acwth adjacent channel wide band threshold amd am prescaler amin am if1 input select amon am-fm switch amseek set short time constant of agc in am seek mode
TDA7512 22/42 amst am stereo select appm application mode quality detection b charge pump low current bwctl iss filter fixed bandwith (iss80) in automatic control casf check alternative station frequency cf center frequency if counter clksep clock separation (only for testing) ctloff switch off automatic control of iss filter currh set current high charge pump dagc am narrow band agc threshold dem demodulator offset dnb demodulator noise spike blanking dth deviation detector threshold for iss filter off dwth deviation detector threshold for iss filter narrow/wide ew frequency error window if counter f100k corner frequency of ac-mute high pass filter g i/q mixer gain adjust if1t fm/am mixer1 tank adjust if2t am mixer2 tank adjust ifagc fm if agc ifcm if counter mode ifena if counter enable ifg if1 amplifier gain (10.7mhz) ifs if counter sampling time issin test input for iss filter isson iss filter on iss30 iss filter 30khz weather band iss80 iss filter narrow/mid switch kagc fm keying agc ldena lock detector enable lm local mode fm seek stop lpf loop filter input select mena softmute enable mpac adjacent channel control by multipath mpf multipath filter frequency mpg multipath filter gain mpoff multipath control off mpth multipath threshold odcur current for overdeviation-correction odsw overdeviation-correction enable out test output (only for testing) pc counter for pll (vco frequency) ph i/q mixer phase adjust table 7. (continued) register name function
23/42 TDA7512 2.2.1 subaddress rc reference counter pll rfagc fm rf agc sl s meter slider smcth softmute capacitor threshold for iss on smd softmute depth threshold smsl s meter slope smth softmute startpoint threshold tdev time constant for deviation detector test testing pll/ifc (only for testing) tin switch fsu pin to test input (only for testing) tinac test input adjacent channel (only for testing) tinacm test input adjacent channel mute (only for testing) tinmp test input multipath(only for testing) tiss time constant for iss filter on/off tout switch fsu pin to test output (only for testing) tvo tuning voltage offset for prestage tvwb tuning voltage offset for prestage (weather band mode) vcod vco divider wagc am wide band agc xtal xtal frequency adjust table 8. msb lsb function i a4a3a2a1a0 0 0 0 0 0 charge pump control 0 0 0 0 1 pll lock detector ------ 1 0 1 0 1 i/q adj 0 page mode off 1 page mode enable table 7. (continued) register name function
TDA7512 24/42 2.3 data byte specification 2.3.1 addr 0 charge pump control 2.3.2 addr 1pll counter 1 (lsb) table 9. msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 0 0 high current = 0ma 0 0 0 1 high current = 0.5ma 0 0 1 0 high current = 1ma 0 0 1 1 high current = 1.5ma ----- 1 1 1 1 high current = 7.5ma 00 low current = 0 m a 01 low current = 50 m a 10 low current = 100 m a 11 low current = 150 m a 0 select low current 1 select high current 0 lock detector disable 1 lock detector enable table 10. msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 00000000lsb = 0 00000001lsb = 1 00000010lsb = 2 --------- 11111100lsb = 252 11111101lsb = 253 11111110lsb = 254 11111111lsb = 255
25/42 TDA7512 2.3.3 addr 2 pll counter 2 (msb) note: 1. swallow mode: f vco /f syn = lsb + msb + 32 2.3.4 ddr 3,4 tv1,2 (offset refered to tuning voltage pin 28) table 11. msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 00000000msb = 0 00000001msb = 256 00000010msb = 512 --------- 1 1 1 1 1 1 0 0 msb = 64768 1 1 1 1 1 1 0 1 msb = 65024 1 1 1 1 1 1 1 0 msb = 65280 1 1 1 1 1 1 1 1 msb = 65536 table 12. msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 0 0 0 0 0 tuning voltage offset = 0 0000001tvo = 25mv 0000010tvo = 50mv --------- 1 1 1 1 1 1 1 tvo = 3175mv 0 -tvo 1+tvo
TDA7512 26/42 2.3.5 addr 5 if counter control 1 2.3.6 addr 6 if counter control 2 table 13. msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 000t sample = 20.48ms (fm)128ms (am ) 001t sample = 10.24ms (fm)64ms (am ) 010t sample = 5.12ms (fm)32ms (am ) 011t sample = 2.56ms (fm)16ms (am ) 100t sample = 1.28ms (fm)8ms (am ) 101 t sample = 640 m s (fm)4ms (am ) 110 t sample = 320 m s (fm)2ms (am) 111 t sample = 160 m s (fm)1ms (am ) 0 if counter disable / stand by 1 if counter enable 0 0 not valid 0 1 if counter fm mode 1 0 if counter am mode (450khz) 1 1 if counter am mode (10.7mhz) 0 disable mute & agc on hold in fm mode 1 enable mute & agc on hold in fm mode 0 disable local mode 1 enable local mode (pin diode current = 0.5ma) on table 14. msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 00000f center = 10.60625mhz (fm) / 10.689mhz ; 449khz (am) 00001f center = 10.61250mhz (fm) / 10.690mhz ; 450khz (am) --------- 01011f center = 10.67500mhz (fm) / 10.700mhz ; 460khz (am) 01100f center = 10.68125mhz (fm) / 10.701mhz ; 461khz (am) 01101f center = 10.68750mhz (fm) / 10.702mhz ; 462khz (am) 01110f center = 10.69375mhz (fm) / 10.703mhz ; 463khz (am) 01111f center = 10.70000mhz (fm) / 10.704mhz ; 464khz(am) --------- 11111f center = 10.80000mhz (fm) / 10.720mhz ;480khz (am) 0 0 0 not valid 0 0 1 not valid 0 1 0 not valid 011 d f = 6.25khz (fm)1khz (am) 100 d f = 12.5khz (fm) 2khz (am) 101 d f = 25khz (fm) 4khz (am) 110 d f = 50khz (fm) 8khz (am) 111 d f = 100khz (fm)16khz (am)
27/42 TDA7512 2.3.7 addr 7 am control 2.3.8 addr 8 quality iss filter table 15. msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 normal agc time constant 1 short time constant for am seek stop 0 multipath information available fm at pin 34 1 am stereo output available at pin 34 0 0 prescaler ratio 10 0 1 prescaler ratio 8 1 0 prescaler ratio 6 1 1 prescaler ratio 4 table 16. msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 iss filter control on 1 iss filter control off 0 switch iss filter off 1 switch iss filter on 0 switch off iss filter 120khz 1 switch on iss filter 80khz 0 switch off iss filter 30khz for weatherband 1 switch on iss filter 30khz for weatherband 0 disable tv offset for weather band 1 enable tv offset for weather band (+4v) 000 discharge current1 m a, charge current mid 74 ma narrow124 ma 001 discharge current3 m a, charge current mid 72 ma narrow122 ma 010 discharge current5 m a, charge current mid 70 ma narrow120 ma 011 discharge current7 m a, charge current mid 68 ma narrow118 ma --- - 111 discharge current15 m a,charge current mid 60 ma narrow110 ma
TDA7512 28/42 2.3.9 addr 9 quality detection adjacent channel 2.3.10 addr 10 quality detection multipath table 17. msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0/1 not valid 0 ac highpass frequency 100khz 1 ac bandpass frequency 100khz 0 ac gain 32db 1 ac gain 38db 0 0 0 ac wide band threshold 0.25v 0 0 1 ac wide band threshold 0.35v 0 1 0 ac wide band threshold 0.45v --- - 1 1 1 ac wide band threshold 0.95v 0 0 ac narrow band threshold 0.0v 0 1 ac narrow band threshold 0.1v 1 0 ac narrow band threshold 0.2v 1 1 ac narrow band threshold 0.3v table 18. msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 multipath control on 1 multipath control off 0 mp bandpass frequency 19khz 1 mp bandpass frequency 31khz 0 mp gain 12db 1 mp gain 23db 0 0 mp threshold 0.50v 0 1 mp threshold 0.75v 1 0 mp threshold 1.00v 1 1 mp threshold 1.25v 0 0 application mode 1 0 1 application mode 2 0 multipath eliminates ac 1 multipath eliminates ac and ac+
29/42 TDA7512 2.3.11 addr 11 quality deviation detection 2.3.12 addr 12 softmute control 1 table 19. msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 000 charge current 34 ma, discharge current 6 ma 001 charge current 32 ma, discharge current 8 ma 010 charge current 30 ma, discharge current 10 ma 011 charge current 28 ma, discharge current 12 ma ---- 111 charge current 20 ma, discharge current 20 ma 0 0 dev threshold for iss narrow/wide 30khz 0 1 dev threshold for iss narrow/wide 45khz 1 0 dev threshold for iss narrow/wide 60khz 1 1 dev threshold for iss narrow/wide 75khz 0 0 dev threshold for iss filter off ratio 1.5 0 1 dev threshold for iss filter off ratio 1.4 1 0 dev threshold for iss filter off ratio 1.3 1 1 dev threshold for iss filter off ratio 1 0 disable iss filter to fixed bandwith (iss80) in automatic control 1 enable iss filter to fixed bandwith (iss80) in automatic control table 20. msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 000 startpoint mute 0 in application about 3db m v antenna level 001 startpoint mute 1in application about 4db m v antenna level ---- 111 startpoint mute 7in application about 10db m v antenna level 0 0 0 0 mute depth 0 in application 18db 0 0 0 1 mute depth 1 in application 20db 0 0 1 0 mute depth 2 in application 22db 0 0 1 1 mute depth 3 in application 24db - - - - - (logarithmically behaviour) 1 1 1 1 mute depth 15 in application 36db 0 mute disable 1 mute enable
TDA7512 30/42 2.3.13 addr 13 softmute control 2 2.3.14 addr 14 vcodiv/pllref table 21. msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 disable mute threshold for iss filter on 1 enable mute threshold for iss filter on 0 0 ac mute depth 10db 0 1 ac mute depth 8db 1 0 ac mute depth 6db 1 1 ac mute depth 4db 0 0 0 0 ac mute threshold 60mv 0 0 0 1 ac mute threshold 80mv 0 0 1 0 ac mute threshold 100mv ---- - 0 1 1 1 ac mute threshold 340mv 1 1 1 1 ac mute off 0 ac mute filter 110khz 1 ac mute filter 100khz table 22. msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 not valid (only for testing) 0 1 vco frequency divided by 2 1 0 vco frequency divided by 3 1 1 original vco frequency 0 vco i signal 0 degree 1 vco i signal 180 degree 1 0 0 pll reference frequency 50khz 1 0 1 pll reference frequency 25khz 1 1 0 pll reference frequency 10khz 1 1 1 pll reference frequency 9khz 0 0 0 pll reference frequency 2khz 0 select fm mode 1 select am mode 0 select pll low pass filter fm 1 select pll low pass filter am
31/42 TDA7512 2.3.15 addr 15 fm agc table 23. msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 00 rfagc threshold v 7-9th = 85(77 ant)db m v 01 rfagc threshold v 7-9th = 90(82 ant)db m v 10 rfagc threshold v 7-9th = 94(86 ant)db m v 11 rfagc threshold v 7-9th = 96(88 ant)db m v 00 ifagc threshold v 60th = 86(60 ant)db m v 01 ifagc threshold v 60th = 92(66 ant)db m v 10 ifagc threshold v 60th = 96(70 ant)db m v 11 ifagc threshold v 60th = 98(72 ant)db m v 000 kagc threshold 80db m v 001 kagc threshold 82db m v 010 kagc threshold 84db m v 011 kagc threshold 86db m v 100 kagc threshold 88db m v 101 kagc threshold 90db m v 110 kagc threshold 92db m v 1 1 1 keying agc off 0 has to be 0
TDA7512 32/42 2.3.16 addr 16 am agc table 24. msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0000 wagc v 3th = 90(65 ant)db m v 58th = 90(60 ant)db m 0001 wagc v 3th = 94(69 ant)db m v 58th = 94(64 ant)db m 0010 wagc v 3th = 97(72 ant)db m v 58th = 96,5(66,5 ant)db m 0011 wagc v 3th = 98,5(73,5 ant)db m v 58th = 98,5(68,5 ant)db m 0100 wagc v 3th = 100(75 ant)db m v 58th = 100(70 ant)db m 0101 wagc v 3th = 101,5(76,5 ant)db m v 58th = 101(71 ant)db m 0110 wagc v 3th = 102,5(77,5 ant)db m v 58th = 102,5(72,5 ant)db m 0111 wagc v 3th = 103,5(78,5 ant)db m v 58th = 103,5(73,5 ant)db m 1000 wagc v 3th = 104,5(79,5 ant)db m v 58th = 104(74 ant)db m 1001 wagc v 3th = 105(80 ant)db m v 58th = 105(75 ant)db m 1010 wagc v 3th = 106(81 ant)db m v 58th = 105,5(75,5 ant)db m 1011 wagc v 3th = 106,5(81,5 ant)db m v 58th = 106,5(76,5 ant)db m 1100 wagc v 3th = 107(82 ant)db m v 58th = 107(77 ant)db m 1101 wagc v 3th = 108(83 ant)db m v 58th = 107,5(77,5 ant)db m 1110 wagc v 3th = 108,5(83,5 ant)db m v 58th = 108(78 ant)db m 1111 wagc v 3th = 109(84 ant)db m v 58th = 108,5(78,5 ant)db m 0000 dagc v 58th = 74(44 antenna)db m 0001 dagc v 58th = 77(47 antenna)db m 0010 dagc v 58th = 79(49 antenna)db m 0011 dagc v 58th = 80,5(50,5 antenna)db m 0100 dagc v 58th = 82(52 antenna)db m 0101 dagc v 58th = 83,5(53,5 antenna)db m 0110 dagc v 58th = 85(55 antenna)db m 0111 dagc v 58th = 86,5(56,5 antenna)db m 1000 dagc v 58th = 88(58 antenna)db m 1001 dagc v 58th = 89(59 antenna)db m 1010 dagc v 58th = 90(60 antenna)db m 1011 dagc v 58th = 91(61 antenna)db m 1100 dagc v 58th = 92(62 antenna)db m 1101 dagc v 58th = 93(63 antenna)db m 1110 dagc v 58th = 94(64 antenna)db m 1111 dagc v 58th = 96(66 antenna)db m
33/42 TDA7512 2.3.17 addr 17 fm demodulator fine adjust 2.3.18 addr 18 s-meter slider table 25. msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0000000mv 0 0 0 0 0 1 +8.5mv 000010+17mv ------- 0 1 1 1 1 1 +263.5mv 1000000mv 1 0 0 0 0 1 -8.5mv 100010-17mv ------- 1 1 1 1 1 1 -263.5mv 0 0 spike cancelation off 0 1 threshold for spike cancelation 270mv 1 0 threshold for spike cancelation 520mv 1 1 threshold for spike cancelation 750mv table 26. msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 0 0 s meter slider offset sl=0db 0 0 0 1 s meter offset sl=1db 0 0 1 0 s meter offset sl=2db ----- 1 1 1 1 s meter offset sl=15db 0 s meter offset -sl 1 s meter offset +sl 0 s meter slope 1v/decade 1 s meter slope 1.5v/decade 0 select external am-if input 1 select internal am-if input 0 overdeviation correction on 1 overdeviation correction off
TDA7512 34/42 2.3.19 addr 19 if gain/xtal adjust 2.3.20 addr 20 tank adjust table 27. msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 if1 gain2 9db 1 if1 gain2 11db 0 0 if1 gain1 9db 0 1 if1 gain1 11db 1 0 if1 gain1 12db 1 1 if1 gain1 15db 00000 c load 0pf 00001 c load 0.75pf 00010 c load 1.5pf 00011 c load 2.25pf 00100 c load 3pf ----- - 11111 c load 23.25pf table 28. msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 0 0 450khz 0pf 0 0 0 1 450khz 1.6pf 0 0 1 0 450khz 3.2pf 0 0 1 1 450khz 4.8pf ----- 1 1 1 1 450khz 24pf 0 0 0 0 10.7mhz 0pf 0 0 0 1 10.7mhz 0.55pf 0 0 1 0 10.7mhz 1.1pf 0 0 1 1 10.7mhz 1.65pf ---- - 1 1 1 1 10.7mhz 8.25pf
35/42 TDA7512 2.3.21 addr 21 i/q fm mixer1 adjust 2.3.22 addr 22 test control 1 2.3.23 addr 23 test control 2 2.3.24 addr 24 test control 3 2.3.25 addr25 test control 4 table 29. msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 0 0 0 0 -7 degree 0 0 0 1 -6 degree 0 0 1 0 -5 degree ----- 0 1 1 1 0 degree 1 0 0 0 +1 degree 1 0 0 1 +2 degree ----- 1 1 1 1 +8degree 00 0% 0 1 -1% 10 +1% 11 0% x not used 0 overdeviation correction current max=45 m a 1 overdeviation correction current max=90 m a table 30. msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 x x x x x x x x only for testing ( have to be set to 0) table 31. msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 x x x x x x x x only for testing ( have to be set to 0) table 32. msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 x x x x x x x x only for testing ( have to be set to 0) table 33. msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 x x x x x x x x only for testing ( have to be set to 0)
TDA7512 36/42 3. appendix figure 1. block diagram i/q mixer figure 2. block diagram vco
37/42 TDA7512 figure 3. block diagram keying agc figure 4. block diagram iss function 5.7v
TDA7512 38/42 block diagram quality detection principle (without overdeviation correction) part list (application- and measurment circuit) table 34. signal low high ac no adjacent channel adjacent channel present ac+ no strong adjacent channel adjacent channel higher as ac sm fieldstrength higher as softmute threshold fieldstrength lower as softmute threshold dev deviation lower as threshold dwth deviation higher as threshold dwth dev+ deviation lower as threshold dth*dwth deviation higher as threshold dth*dwth inton iss filter off by logic (wide) iss filter on by logic int80 iss filter 120khz (mid) iss filter 80khz (narrow) table 35. input signals mode1 mode2 ac ac+ sm dev dev+ inton int80 function inton int80 function 0000000wide00wide 0001000wide00wide 0001100wide00wide 0 0 1 0 0 1 1 narrow 1 1 narrow 0011000wide10mid 0011100wide00wide 1 0 0 0 0 1 1 narrow 1 0 mid 1 1 0 0 0 1 1 narrow 1 1 narrow 1001010mid10mid 1 1 0 1 1 1 0 mid 1 1 narrow 1 0 1 0 0 1 1 narrow 1 1 narrow 1 1 1 0 0 1 1 narrow 1 1 narrow 1011010mid10mid 1 1 1 1 0 1 0 mid 1 1 narrow 1011110mid10mid 1 1 1 1 1 1 0 mid 1 1 narrow table 36. item description f1 toko 5kg 611sns-a096go f2 toko 5km 396ins-a467ao f3 toko mc152 e558hna-100092 f4 toko 7psg 826ac-a0022ek=s f5 toko pgl 5pglc-5103n l1 toko fslm 2520-150 15h l2,l4 toko fslm 2520-680 68h l3,l8 siemens simid03 b82432 1mh l5 toko ll 2012-220
39/42 TDA7512 figure 5. l6 toko ll 2012-270 l7 toko ll 2012-22.0 cf1,cf2 murata sfe10.7ms3a10-a 180khz or (toko cfsk107m3-ae-20x) cf3 murata sfe10.7mja10-a 150khz or (toko cfsk107m4-ae-20x) cf4 murata sfps 450h 6khz or (toko arlfc450t) d1 toshiba 1sv172 d2,d3 toko kp2311e d4 toko kv1370nt d5 philips bb156 q1 toshiba hn3g01j table 36. (continued) item description
TDA7512 40/42 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 pins 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.
41/42 TDA7512 tqfp64 dim. mm inch min. typ. max. min. typ. max. a 1.60 0.063 a1 0.05 0.15 0.002 0.006 a2 1.35 1.40 1.45 0.053 0.055 0.057 b 0.18 0.23 0.28 0.007 0.009 0.011 c 0.12 0.16 0.20 0.0047 0.0063 0.0079 d 12.00 0.472 d1 10.00 0.394 d3 7.50 0.295 e 0.50 0.0197 e 12.00 0.472 e1 10.00 0.394 e3 7.50 0.295 l 0.40 0.60 0.75 0.0157 0.0236 0.0295 l1 1.00 0.0393 k 0 (min.), 7 (max.) a a2 a1 b c 16 17 32 33 48 49 64 e3 d3 e1 e d1 d e 1 k b tqfp64 l l1 seating plane 0.10mm outline and mechanical data
information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the co nsequences 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 publicati on are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics prod ucts are not authorized for use as critical components in life support devices or systems without express written approval of stmicroelectro nics. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners ? 2003 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states www.st.com 42/42 TDA7512

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