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telefunken semiconductors U2860B-A preliminary information rev. a1: 23.08.1995 1 ((11) dual channel fm sound demodulator for tv systems description the u2860b is a dual channel fm sound demodulator realized with telefunken`s advanced bipolar process. all tv fm standards, from 4.5 up to 6.5 mhz (standard m, b/g, i, d/k), can be processed with high performance. the circuit is alignment-free and has a minimum number of external components. with 5 v supply voltage the u2860b is suitable for tv, vcr and multimedia applications. features two alignment-free pll fm demodulators, automatic lock in on the received sound carrier frequency mono and dual channel application sound if inputs provided for ceramic filters automatic mute for 2nd sound channel (squelch) mute function for both sound channels 5 v supply voltage, low power consumption few external components package: 14 pin dual-inline plastic (dip14) loop filter 1 vco 1 mute 1 3 4 13 11 12 supply 8 7 94 8139 e c stab vco offset 10 vco offset loop filter 2 vco 1 v s squelch squelch (second carrier) 14 squelch v in1 v in2 mute v af1 v af2 6 9 r ref (optional) figure 1. block diagram
telefunken semiconductors U2860B-A preliminary information rev. a1: 23.08.1995 2 (11) circuit description the u2860b includes two identical sound if channels. each consists of a limiter amplifier, pll fm demodulator and af amplifier. additionally this circuit contains a squelch function, mute switch and internal voltage regulation. limiter amplifiers the intercarrier signals are fed through external ceramic bandpass filters to a 7 stage limiter amplifier. this guarantees high input sensitivity and excellent am suppression. pll fm demodulators the alignment-free ophase locked loopo (pll) demo- dulator cover a wide frequency range of 4.5 mhz up to 6.5 mhz with low noise performance. the linear voltage to frequency characteristic results in low harmonic distortion. the free running frequency of the internal vco circuit is about 5.5 mhz. for this frequency the input sensitivity and vco locking is optimal. an addi- tional external resistor at pin 10 allows frequency shift of 1 mhz via an internal offset current. with this option it is possible to shift the optimum conditions to the upper frequency (6.5 mhz) or to the lower frequency (4.5 mhz). the offset current acts simultaneously on both vco circuits. if no resistor is connected the offset current is disabled. audio amplifiers the demodulated signals are amplified to 500 mvrms with low output impedance at the audio outputs (pin 6 and pin 7). ac decoupling at pin 8 and pin 9 of the audio am- plifiers leads to high common mode rejection. squelch function for channel 2 the audio output amplifier and vco2 is muted automatically (squelch) when the second sound carrier is not present. this avoids a wrong identification for stereo and dual sound in the stereo decoder. therefore, with mono sound, there is no output signal at pin 6. the automatic squelch function can be disabled by switching pin 4 to ground. mute switch simultaneously muting of both circuits is possible with switching pin 3 to ground. internal voltage stabilizer the internal bandgap reference ensures constant perfor- mance independent of supply voltage and temperature.
telefunken semiconductors U2860B-A preliminary information rev. a1: 23.08.1995 3 ((11) pin description 14 13 12 11 10 9 8 1 2 3 4 5 6 7 94 8679 v in1 n.c. v mute v sque v af2 v af1 gnd v in2 v s c stab r ref c 9 c 8 u2860b n.c. figure 2. connection diagram pin symbol function 1 v in1 intercarrier input of sound channel 1 (5.5 mhz) 2 n.c not connected 3 v mute mute for sound channel 1+2 oon/offo 4 v sque automatic mute for 2nd sound channel (squelch) oon/offo 5 n.c. not connected 6 v af2 audio output af2 of sound channel 2 7 v af1 audio output af1 of sound channel 1 8 c 8 decoupling capacitor for sound channel 1 9 c 9 decoupling capacitor for sound channel 2 10 r ref vco offset of the free running frequency 11 c stab internal supply voltage stabilization 12 gnd ground 13 v s supply voltage 14 v in2 intercarrier input of sound channel 2 (5.74 mhz) absolute maximum ratings reference point pin 12, unless otherwise specified. parameters symbol value unit supply voltage pin 13 v s 9.0 v supply current pin 13 i s 33 ma power dissipation v s = +9 v p 300 mw output currents pin 6, 7 i out 1.5 ma external voltages pin 1, 14 pin 3, 4 pin 6, 7, 8, 9, 10, 11 v ext v ext v ext 2.0 v s 4.5 v v v v junction temperature t j +125 c storage temperature t stg 25 to +125 c electrostatic handling * ) all pins v esd 200 v * ) machine model in accordance with esd s5.2 standard
telefunken semiconductors U2860B-A preliminary information rev. a1: 23.08.1995 4 (11) operating range parameters symbol value unit supply voltage range pin 13 v s 4.5 to 9.0 v ambient temperature t amb 0 to +85 c thermal resistance parameters symbol value unit junction-ambient when soldered to pcb r thja 90 k/w electrical characteristics v s = 5 v, t amb = 25 c, reference point pin 12, unless otherwise specified parameters test conditions / pins symbol min. typ. max. unit dc-supply pin 13 supply voltage range v s 4.5 5.0 9.0 v supply current i s 27 33 ma intercarrier input 1 pin 1 dc input voltage v dc 1.75 v input resistance see note 1 r in 680 750 input limiting voltage input signal v in : f = 5.5 mhz output signal af1: v af1 ? 3 db v lim 150 v intercarrier input 2 pin 14 dc input voltage v dc 1.75 v input resistance see note 1 r in 680 750 input limiting voltage input signal v in : f = 5.74 mhz output signal af2: v af2 ? 3 db v lim 150 v input signal for automatic second sound carrier omute offo (squelch) audio output af2 active v in > 0.7 1.0 < 1.5 mv fm demodulators, internal vco's pin 10 free-running frequency f vco 5.5 mhz oscillator drift (free run- ning) as function of temper- ature d t = 55 c d f vco 500 khz oscillator shift (free run- ning) as function of supply voltage 4.5 v < v s < 5.5 v d f vco 200 khz adjustment range of free running frequencies by external resistor r ref at pin 10 d f adj 1 mhz adjustment resistance for free running frequencies r ref 15 22 30 k
telefunken semiconductors U2860B-A preliminary information rev. a1: 23.08.1995 5 ((11) unit max. typ. min. symbol test conditions / pins parameters fm demodulators, internal vco's pin 10 steppness of free running frequency adjustment resistor r ref at pin 10 s 200 khz/k capture range of pll's d f cap 1.4 1.9 mhz holding range of pll's d f hold 2.0 3.0 mhz audio outputs, af1 (pin 7) and af2 (pin 6) dc output voltage v dc 2.2 v dc output current i dc 1.8 2.0 ma output resistance see note 1 r out 150 ac output peak current i ac 1.5 ma af output voltage, rms value v in = 10 mv, f = 5.5 mhz, fm-dev. = 50 khz, f mod = 1 khz v af 500 mv difference between the out- put signals d v af 1 db total harmonic distortion v in = 10 mv, f = 5.5 mhz, fm-dev. = 50 khz, f mod = 1 khz thd 0.1 0.5 % am suppression v in = 10 mv, f = 5.5 mhz, f mod = 1 khz, reference signal: fm-dev. = 50 khz test signal: m = 30% am 46 66 db crosstalk attenuation between the af outputs f = 50 hz to 12.5 khz att 70 db supply voltage ripple rejec- tion v rr < 200 mv, f = 70 hz rr 24 db mute switch pin 3 control voltage - muteoff - mute on af outputs active af outputs not active v mute 2.0 0 v s 0.8 v v control current i mute 150 a squelch function pin 4 control voltage for automatic mute-2nd carrier ooffo automatic mute-2nd carrier oono v sque 0 2.0 0.8 v s v v control current i sque 150 a notes 1. this parameter is given as an application information and not measured during final testing.
telefunken semiconductors U2860B-A preliminary information rev. a1: 23.08.1995 6 (11) 14 13 12 11 10 9 8 1 2 3 4 5 6 7 22 nf 22 f +5 v 50 sif 2 2.2 f 2.2 f 10 f mute squelch 15 nf 15 nf af 2 af 1 u2860b 94 8140 c stab 3.3 k 3.3 k 22 nf 50 sif 1 22 nf *) figure 3. test circuit 14 13 12 11 10 9 8 1 2 3 4 5 6 7 22 nf 22 f +5 v 680 680 sif sfe 5.5 mc sfe 5.74 mc 2.2 k 1 k 2.2 f 2.2 f 10 f mute squelch 15 nf 15 nf af 2 af 1 u2860b 94 8498 3.3 k 3.3 k *) sfe 6.0 mc figure 4. application circuit
telefunken semiconductors U2860B-A preliminary information rev. a1: 23.08.1995 7 ((11) 95 10708 figure 5. pcb layout (test/application circuit) 95 10709 figure 6. component layout (test circuit) 95 10710 figure 7. component layout (application circuit)
telefunken semiconductors U2860B-A preliminary information rev. a1: 23.08.1995 8 (11) 0 0.1 0.2 0.3 0.4 0.5 123456789 thd/ % frequency/ mhz 95 10705 figure 8. figure 9 am suppression 80 70 60 50 40 30 20 10 0 30 40 50 60 70 80 90 100 110 120 am suppression/ db if input level/ db v 95 10703 figure 9. vco free running frequency 0.0 20.0 40.0 60.0 80.0 100.0 120.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 umin/ v frequency/ mhz 95 10707 pin 10 open r 10 = 15 k r 10 = 30 k figure 10. total harmonic distortion 1.0 1.5 2.0 2.5 3.0 123456789 vco control voltage (u8)/ v frequency/ mhz 95 10702 input level = caption hold figure 11. capture and hold range 18 14 10 6 2 2 26 28 30 32 34 36 38 40 42 44 af output level/ db if input level/ db v 95 10704 f = 5.5 mhz, fm-dev = +/50 khz, fmod = 1 khz, 50 s-deemphasis figure 12. limiter characteristics 80 75 70 65 60 55 50 2.0 4.0 6.0 8.0 (s+n)/ n [db] frequency/ mhz 95 10706 figure 13. signal to noise ratio
telefunken semiconductors U2860B-A preliminary information rev. a1: 23.08.1995 9 ((11) 94 8587 600 1,14 600 1.75 v figure 14. sif inputs 2 k 20 k 94 8588 3.5 v 3,4 figure 15. mute switch/squelch switch 94 8589 100 1.8 ma 6,7 figure 16. audio outputs 94 8590 5 k 8,9 figure 17. decoupling capacitor 22 k 11.5 k 94 8591 3.5 v 10 figure 18. vco offset (reference resistor) 94 8592 11 3.5 v figure 19. internal supply voltage stabilization
telefunken semiconductors U2860B-A preliminary information rev. a1: 23.08.1995 10 (11) dimensions in mm 94 9445 figure 20. 14 pin dual-inline-plastic (dip 14)
telefunken semiconductors U2860B-A preliminary information rev. a1: 23.08.1995 11 ((11) ozone depleting substances policy statement it is the policy of temic telefunken microelectronic gmbh to 1. meet all present and future national and international statutory requirements. 2. regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. it is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances ( odss). the montreal protocol ( 1987) and its london amendments ( 1990) intend to severely restrict the use of odss and forbid their use within the next ten years. various national and international initiatives are pressing for an earlier ban on these substances. temic telefunken microelectronic gmbh semiconductor division has been able to use its policy of continuous improvements to eliminate the use of odss listed in the following documents. 1. annex a, b and list of transitional substances of the montreal protocol and the london amendments respectively 2 . class i and ii ozone depleting substances in the clean air act amendments of 1990 by the environmental protection agency ( epa ) in the usa 3. council decision 88/540/eec and 91/690/eec annex a, b and c ( transitional substances ) respectively. temic can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances. we reserve the right to make changes to improve technical design and may do so without further notice . parameters can vary in different applications. all operating parameters must be validated for each customer application by the customer. should the buyer use temic products for any unintended or unauthorized application, the buyer shall indemnify temic against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. temic telefunken microelectronic gmbh, p.o.b. 3535, d-74025 heilbronn, germany telephone: 49 ( 0 ) 7131 67 2831, fax number: 49 ( 0 ) 7131 67 2423

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