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t a = 0 to +70 c device operating temperature range package semiconductor technical data programmable telephone line interface circuit with loudspeaker amplifier ordering information MC34216Adw so28l dw, dwf suffix plastic package case 751f 28 1 pin connections order this document by MC34216A/d 1 28 27 26 25 24 23 22 21 2 3 4 5 6 7 8 aho1 aho2 mtf mtc mic agc rxo1 lpi gnd v cc 20 9 lao lai i ref 19 10 hyn r s lpo rxi rxo2 agnd txi (top view) 18 11 ndc clk 17 12 cm d/hs 16 13 imp osc 15 14 sao sai MC34216Adwf so28l 1 motorola analog ic device data

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the MC34216A is developed for use in telephone applications where, besides the standard telephone functions, the group listeningin feature is also required. in cooperation with a microcontroller , the circuit performs all basic telephone functions including dtmf generation and pulsedialing. the listeningin part includes a loudspeaker amplifier , an antihowling circuit and a strong supply . in combination with the tca3385, the ringing is performed via the loudspeaker. ? programmable dc mask, for france, u.k., and voltage regulated countries ? dc mask for france and u.k. (MC34216Adwf) ? programmable volume for listeningin and ringing ? small amount of external components ? onchip dtmf and ring signal generator ? efficient supply point for loudspeaker amplifier and peripherals ? programmable modes for speakerphone, answering machine, fax and modem applications ? pilot and idle tones provide extra phone features simplified block diagram this device contains 6,507 active transistors. line driver anti howling mic supply stabilizer dc mask generation ac termination 24 wire conversion dc and ac termination handset earpiece handset microphone line line + lsp base loudspeaker micro- controller interface dtmf and ring generator ear this document contains information on a new product. specifications and information herein are subject to change without notice. ? motorola, inc. 1996
MC34216A 2 motorola analog ic device data features line driver and supply ? dc and ac termination of the line ? programmable dc mask: france, u.k., startup, low voltage (MC34216Adw) ? programmable dc mask: france, u.k., startup (MC34216Adwf) ? current protection ? adjustable set impedance for resistive and complex termination ? efficient supply point for loudspeaker amplifier and peripherals handset operation ? transmit and receive amplifiers ? adjustable sidetone network ? line length agc ? microphone and earpiece mute ? earpiece gain increase switch ? microphone squelch function ? transmit amplifier soft clipping dialing and ringing ? generates dtmf, pilot tones and ring signal ? interrupter driver for pulsedialing ? low current while pulsedialing ? optimized for ringing via loudspeaker ? programmable ring melodies ? uses inexpensive 500 khz resonator loudspeaking facility ? integrated loudspeaker amplifier ? peaktopeak limiter prevents distortion ? programmable volume ? antihowling circuitry for group listeningin ? interfacing for handsfree conversation application areas ? corded telephony with group listeningin ? cordless telephony base station with group listeningin ? telephones with answering machines ? fax, intercom, modem maximum ratings rating symbol min max unit maximum junction temperature t j +150 c storage temperature range t stg 65 +150 c notes: 1. devices should not be operated at or outside these values. the arecommended operating limitso provide for actual device operation. 2. esd data available upon request. recommended operating conditions characteristic symbol min typ max unit oscillator frequency @ pin 16 f osc 495 500 505 khz operating temperature range t a 0 +70 c
MC34216A 3 motorola analog ic device data dc electrical characteristics (t a = 25 c) characteristic symbol min typ max unit voltage regulator regulated supply at pin 21 vdc startup mode i cc = 10 ma v cc1 4.25 4.50 4.75 i cc = 100 ma 4.40 4.65 4.90 france and u.k. i cc = 10 ma v cc2 4.25 4.50 4.75 i cc = 50 ma 4.30 4.55 4.85 low voltage mode (MC34216Adw only) i cc = 10 ma v cc3 3.60 3.90 4.20 i cc = 100 ma 3.75 4.05 4.35 current consumption at pin 21, bit ld = hi i cc ld 1.2 ma regulated supply in protection mode, i cc = 30 ma v cc5 4.30 4.80 vdc reference current @ pin 20 i ref 15.3 16.3 17.3 m a logic pins hook status output (pin 17) vdc offhook, i out = 200 m a v hso1 v cc 1.0 onhook, i out = 200 m a v hso2 0.4 bit ld = 1, i out = 200 m a v hso3 v cc 1.0 reset output (pin 19) vdc v cc < 3.0 v v res(on) 0.40 v cc > 3.25 v v res(off) 3.0 v cc 0.1 hysteresis v res(hys) 0.05 speech amplifiers earpiece amplifier dc bias vdc rxi, pin 25 v rxi 1.7 2.3 rxo1, pin 26 v rxo1 1.7 2.5 rxo2, pin 27 v rxo2 1.7 2.5 rxo1 rxo2 offset v offset 0.4 loudspeaker amplifier vdc lpi, pin 24 v lpi 1.9 2.5 lpo, pin 23 v lpo 1.9 2.5 aho1 (pin 1) vdc normal mode (hpi = 0) v aho11 1.15 1.65 supervision mode (hpi = 1) v aho12 2.2 2.8 aho2 (pin 2) vdc normal mode (micm = 1) v aho21 1.15 1.65 v cc = 3.5 (micm = 0) v aho22 0.20 bias voltage at hyn (pin 10) vdc normal mode v hyn 2.4 2.7 bit (ld = 1) v hynld 1.4 1.7 microphone amplifier bias voltage @ txi (pin 6) v txi 1.7 2.0 vdc v oltage at mic @ 1.0 ma ( micp = 1) v mic 0.35 leakage @ mic @ 4.5 v (micp = 0) i leak 5.5 m a lao (pin 8) maximum current (source) i8 150 110 m a maximum current (sink) i8 110 150 voltage (ld = 1, i = 100 m a) v lao 350 mv driver a8 slope s8 1.6 2.1 2.6 m a/mv v o1 follower (i2 = 0 m a) v o1 1.1 1.18 1.3 v v o1 v o2 d v o 40 80 120 mv voltage at imp (pin 13) v imp 2.2 2.5 vdc
MC34216A 4 motorola analog ic device data dc electrical characteristics (continued) (t a = 25 c) characteristic unit max typ min symbol dc mask characteristics startup mode internal slope ri 300 380 460 mv/ m a voltage on sai (i2c = 5.9 m a) v c 800 mv voltage on sai (i2d = 7.1 m a) v d 1.5 v delta offset voltage on sai (i2e = 38 m a) v e v d 100 mv french internal slope ri 76 103 130 mv/ m a voltage on sai (i2c = 5.9 m a) v c 280 mv voltage on sai (i2d = 7.1 m a) v d 460 delta offset voltage on sai (i2e = 38 m a) v e v d 30 u.k. internal slope ri 120 165 210 mv/ m a voltage on sai (i2c = 5.9 m a) v c 420 mv voltage on sai (i2d = 7.1 m a) v d 675 delta offset voltage on sai (i2e = 38 m a) v e v d 40 low voltage mode (MC34216Adw only) internal slope ri 95 129 165 mv/ m a voltage on sai (i2c = 15 m a) v c 900 mv voltage on sai (i2d = 17 m a) v d 1.5 vdc delta offset voltage on sai (i2e = 20 m a) v e v d 100 mv overvoltage protection threshold (v lai v sao ) v clamp1 485 550 615 mv i prot = 60 m a, i cc = 70 ma protection voltage level (v lai v sao ) v clamp2 370 410 450 mv i prot = 60 m a ac electrical characteristics (t a = 25 c) characteristic symbol min typ max unit transmit mode french and u.k. db maximum transmit gain (i2 = 5.6 m a) k m 0 13.5 14.5 15.5 line length regulation (i2 = 27.5 m a) d k m 5.0 6.0 7.0 gain in protection mode (i2 = 29.5 m a) k m p 13.5 14.5 15.5 low voltage mode (MC34216Adw only) db maximum transmit gain (i2 = 3.5 m a) k m 0 13.5 14.5 15.5 line length regulation (i2 = 7.7 m a) d k m 4.7 6.0 7.3 gain in protection mode (i2 = 7.7 m a) k m p 13.5 14.5 15.5 gain reduction when microphone is muted d k mute 60 db receive mode french maximum internal transconductance (i2 = 5.6 m a) g e0 203 230 258 m a/v line length regulation (i2 = 26 m a) d g e 5.0 6.0 7.0 db protection mode (i2 = 26 m a) g ep 203 230 258 m a/v u.k. maximum internal transconductance (i2 = 5.6 m a) g e0 203 230 258 m a/v line length regulation (i2 = 26 m a) d g e 5.0 6.0 7.0 db protection mode (i2 = 26 m a) g ep 203 230 258 m a/v low voltage mode (MC34216Adw only) maximum internal transconductance (i2 = 3.5 m a) g e0 183 210 241 m a/v line length regulation (i2 = 7.9 m a) d g e 4.7 6.0 7.3 db protection mode (i2 = 7.9 m a) g ep 183 210 241 m a/v earpiece gain reduction when muted d g e mute 60 db earpiece gain variation (ea bit changed to 1) d g e1 4.6 5.6 6.6 db
MC34216A 5 motorola analog ic device data ac electrical characteristics (continued) (t a = 25 c) characteristic unit max typ min symbol transmit pabx mode french and u.k. db transmit gain (i2 = 2.0 m a) k pabx 11.4 12.5 13.6 v ariation with line length (i2 = 27 m a) d k pabx 0.5 0.5 low voltage mode (MC34216Adw only) db transmit gain (i2 = 2.0 m a) k pabx 11.5 12.5 13.6 v ariation with line length (i2 = 20 m a) d k pabx 0.5 0.5 variation with line current (i cc = 16 ma) d k pabx1 0.5 0 0.5 variation with line current (i cc = 7.0 ma) d k pabx2 2.0 0 2.0 receive pabx mode french internal transconductance (i2 = 2.0 m a) g pabx 157 180 207 m a/v v ariation with line length (i2 = 27 m a) d g pabx 0.5 0.5 db u.k. internal transconductance (i2 = 2.0 m a) g pabx 157 180 207 m a/v v ariation with line length (i2 = 27 m a) d g pabx 0.5 0.5 db low voltage mode (MC34216Adw only) internal transconductance (i2 = 2.0 m a) g pabx 152 175 200 m a/v v ariation with line length (i2 = 20 m a) d g pabx 0.5 0.5 db variation with line current (i cc = 16 ma) d g pabx1 0.5 0.5 variation with line current (i cc = 7.0 ma) d g pabx2 2.0 2.0 distortion french and u.k. transmit (i2 = 1030 m a) french receive v e = 700 mv (i2 = 10 m a) v e = 1350 mv thdt thdr 3.0 3.0 5.0 % low voltage transmit (i2 = 1020 m a) (MC34216Adw only) receive v e = 700 mv (i2 = 20 m a) v e = 1350 mv thdt thdr 3.0 3.0 5.0 % note : v e is the dif ferential earpiece voltage across pins 26 and 27. other electrical characteristics (t a = 25 c) characteristic symbol min typ max unit line current agc ( r ls = 25 w , g0 = g1 = g2 = 1, v ls = 2.0 v pp , french, u.k., and lv masks) line current for which agc is active i agc(on) 19 ma v cc with current agc aono (i cc = 13 ma) v cc agc v cc 5.0% v cc vdc line current for which agc is inactive i agc(off) 21 ma peaktopeak agc (r ls = 25 w , c25 = 220 nf, g0 = g1 = g2 = 1, i cc = 40 ma) dc level at pin 28 vdc agc aoffo v agc(off) 1.6 1.7 1.8 agc aono v agc(on) 1.2 1.3 1.5 agc upper threshold v ls(up) v rms france and u.k. v cc 1.2 v cc 1.0 low voltage (MC34216Adw only) 0.85 1.0 agc lower threshold v ls(low) v rms france and u.k. v cc 1.9 v cc 1.6 low voltage (MC34216Adw only) 0.72 0.85 1 step agc gain variation (lsb) d agc 1.0 1.25 1.50 db antihowling monitoring receive gain internal resistor r t muted (g2, g1, g0 = 000) r t000 10 18 w maximum gain (g2, g1, g0 = 111) r t111 40 60 80 k w attenuation step d g ls 3.5 4.5 5.5 db
MC34216A 6 motorola analog ic device data other electrical characteristics (continued) (t a = 25 c) characteristic unit max typ min symbol ringing mode regulation regulated v cc (r ls = , i cc = 10 ma) v cc r 5.15 5.5 5.8 vdc current consumption @ v cc = 3.4 v, r ls = icr 2.0 2.6 ma ringing regulator slope gr 4.8 6.3 7.8 m a/v peak current @ v cc = 4.2 v ir peak 2.0 2.5 3.0 m a minimum v cc v cc0 3.8 vdc microphone threshold transmit gain variation (m th(on) /m th(off) ) db iu = 33 na d k m mth1 7.0 iu = 110 na d k m mth2 0.5 0 0.5 ls gain variation (m th(on) /m th(off) ) db iu = 33 na d g lsmth1 0.5 0 0.5 iu = 110 na d g lsmth2 7.0 speakerphone mode (g2, g1, g0 = 111, sp bit = 1) dc level on pin 1 v aho1 2.2 2.8 vdc speakerphone gain g sp 30 32 34 db monitoring signal in loudspeaker (r/s = 0, g2, g1, g0 = 111) dtmf level mv sp = 0 low frequency v lsl1 200 high frequency v lsh1 250 sp = 1 low frequency v lsl2 700 high frequency v lsh2 900 pilot tone (pt = 1) mv sp = 0 v lsp1 185 sp = 1 v lsp2 560 idle tone (it = 1) mv sp = 0 v lsi1 145 sp = 1 v lsi2 700 ring tone (rt = 1) mv sp = 0 v lsr1 1100 sp = 1 v lsr2 1400 monitoring signal in earpiece (single ended) dtmf level mv low frequency v rxol 12 high frequency v rxoh 15 pilot tone (pt = 1) v rxop 8.0 mv idle tone (it = 1) v rxoi 6.0 mv idle tone on line idle tone level (mfc01 = 11, mfo123 = 000) i idle0 400 550 700 na step size i idle(step) 62 na dtmf levels level on lai (pin 9, i cc = 20 to 70 ma, french and u.k. masks) na mfo123 = 1111, high frequency group i dtmf15 1124 1336 1586 mfo123 = 0111, high frequency group i dtmf12 988 1175 1397 mfo123 = 0000, low frequency group i dtmf0 373 444 528 high/low frequency preemphasis g dtmf 1.0 2.0 3.0 db note : in low voltage mode, above levels must be reduced by 0.5 db.
MC34216A 7 motorola analog ic device data dtmf frequencies characteristic min typ max unit dtmf std % error low group frequencies 689.4 696.4 703.4 hz 697 0.09 761.5 769.2 776.9 hz 770 0.10 844.7 853.2 861.7 hz 852 0.14 930.5 939.9 949.3 hz 941 0.11 high group frequencies 1195.6 1207.7 1219.8 hz 1209 0.11 1323.5 1336.9 1350.3 hz 1336 0.07 1464.5 1479.3 1494.1 hz 1477 0.16 1617.7 1634 1650.3 hz 1633 0.06 note: minimum values based on f osc = 495 khz. maximum values based on f osc = 505 khz. temperature specifications (t a = 65 c) characteristic symbol min max unit dtmf distortion level on pin lai, delta levels (f = hi freq f = 697 hz) dtmfd 27 db v cc2 in fr mode @ i cc = 50 ma v cc2 4.15 5.0 v v ccr @ i cc = 10 ma, rls = v ccr 5.0 6.0 v v c on pin sai in fr mode v c 220 460 mv ri slope in fr mode ri 65 155 k w rt111 resistor on ls in fr mode rt111 35 85 k w k m 0 in fr mode k m 0 13 16 db g e0 in fr mode g e0 170 270 m a/v reset off @ v cc = 3.25 v v resoff 3.0 3.25 v pin function description pin symbol description 1 aho1 antihowling timing, speakerphone input 2 aho2 antihowling timing, low voltage line driver disable 3 mtf microphone threshold filtering 4 mtc microphone threshold timing 5 agnd small signal ground 6 txi microphone amplifier input 7 mic microphone bias current sink 8 lao line driver amplifier output 9 lai line driver amplifier input 10 hyn hybrid network input 11 ndc noise decoupling 12 cm dc mask signal filtering 13 imp reference voltage 14 sao line current sense amplifier output 15 sai line current sense amplifier input 16 osc oscillator input. connect to 500 khz resonator 17 d/hs data input, hookstatus output 18 clk clock input 19 r s reset output 20 i ref reference current
MC34216A 8 motorola analog ic device data pin function description (continued) pin description symbol 21 v cc supply voltage 22 gnd large signal ground 23 lpo loudspeaker amplifier output 24 lpi loudspeaker amplifier input 25 rxi receive amplifier input 26 rxo1 receive amplifier output 27 rxo2 receive amplifier output 28 agc loudspeaker agc timing circuit description concept with the MC34216A, a microcontroller and a switched mode power supply , a telephone set with listeningin function and ringing via loudspeaker can be built as shown in figure 1. in of fhook position, the application is in speech mode. the line current flows through transistor t2 and supplies the application at the supply point v cc which is stabilized by the MC34216A. the v line , i line characteristic is programmed by the microcontroller and adjusted by the external components z0, z1, z21 and r1 which are in a regulator loop, acting on transistor t2. the ac impedance is generated in a similar way . handset and loudspeaker can be connected directly to the MC34216A to perform handset and listeningin operation. via the bus, the microcontroller programs the MC34216A to perform the dtmf/pulsedialing and supervise the device. the user keyboard has to be connected to the microcontroller . in onhook position, the smps supplies the application in presence of a ringing signal. the microcontroller programs the MC34216A and a ringing melody can be generated via the loudspeaker. the block diagram of the MC34216A (see figure 2), shows the basic blocks of the device plus the essential external components. r1 micro MC34216A t2 z0 z1 z21 a/b hookswitch v cc gnd smps loudspeaker handset figure 1. telephone concept with MC34216A
MC34216A 9 motorola analog ic device data t2 c7 rxo1 z0 z21 z1 t3 c20 r6 r9 c5 r12 r20 rxo2 txi mic aho1 mtc mtf aho2 rxi lao gnd v hyn ndc sao lai imp i supply stabilizer references dc mask generation ac termination 24 wire conversion line length agc protection c12 line + line 26 27 25 6 7 1 21 22 8 2 3 4 10 11 14 9 13 20 antihowling line driver ear mic mute, agc MC34216A c17 agc 28 ref cc mute, agc cm c16 12 to imp to sai to imp ring agnd 5 rs 19 clk 18 d/hs 17 regulator dtmf/tone and ring generator micro interface clock hookdetect osc 16 x1 lpo r30 lpi 23 24 lsp c24 volume microphone threshold c29 c28 c27 c26 c25 to imp c21 r28 to micro controller r1 sai 15 handset earpiece handset microphone speaker figure 2. block diagram of the MC34216A with essential components dc characteristics and startup 2 1 3 4 vlc ivlp ilk ilp vlk ilc vlp v i 0 line line region 1: startup, low line current, high slope region 2: mid range line current, small slope region 3: high line current, high slope region 4: overload protection figure 3. general form of the dc mask of the MC34216A the MC34216A of fers the possibility to adjust the dc characteristics of all 4 regions via both software and hardware adjustments. the software adjustments make it possible to program the 4 dif ferent basic masks: france, united kingdom, low voltage and startup. the hardware adjustments can be used for finetuning. the adjustment possibilities will be discussed below with the aid of the block diagram of figure 4. in region 1, the transfer of the amplifier g at the hyn input equals zero. the voltage dif ference between sao and sai will equal v o1 . the slope r e1 of the v line , i line characteristic will equal: r e1 r1 x 1 z0 z21 in region 2, the output current of the amplifier g will be proportional to the input current. as a result, the voltage between sao and sai will increase with the line voltage. speech signals on the line are of no influence on this because they are filtered out via capacitor c16. the slope r e2 of the v line , i line characteristic will equal: r e2 r1 x 1 1 ri z1 z21 z0 in region 3, the output current of the amplifier g is kept constant. as a result, the slope in region 3 will equal the slope of region 1.
MC34216A 10 motorola analog ic device data z21 t3 t2 z1 c12 rx z0 r5 v c7 2v 1.4 v v line + hyn lai sao ndc sai lao line gnd i2 r1 MC34216A c16 2.4 v imp cm g cc o2 be v o1 + + + + + + + + figure 4. dc part of the block diagram of the MC34216A the transfer from region 2 to 3 occurs at the point vlk, ilk, which is calculated: vlk z1 x i2cd 2v be v cd v o2 ilk z21 z0 x z1 x i2cd 2v be v cd r1 with : i2cd i2c i2d 2 , and v cd v c v d 2 , and 2v be 1.4 v, v o2 1.1 v when the french or u.k. mask is selected, this transfer takes place for line currents of 30 ma to 40 ma depending on the components settings. with the startup and low voltage mask, the transfer lies outside the normal operating range w it h l in e c urrents o f 9 0 m a o r m ore . i n m ost applications, the transfer from region 1 to 2 takes place for line currents below 10 ma. with proper settings, region 4 is only entered during an overload condition. in this mode, the power consumption in the telephone set is limited. in order to detect an overload condition, the voltage between the pins lai and sao is monitored. when the voltage dif ference is larger than the threshold v clamp1 , the protection is made active. the relation for the line voltage vlp at this point is given as: vlp z0 z21 x v clamp1 v cd v o2 when the protection mode is entered, the line current is reduced to a lower value ilp of: ilp v clamp2 v o1 v o2 r1 when the line voltage becomes smaller than vlp , the overload condition is gone and the MC34216A will leave region 4. the current drawn from the line by the dc part is used to supply the MC34216A and peripheral circuits. the surplus of current is sunk away by the voltage stabilizer at pin v cc where a reservoir capacitor is connected. the reference for the circuit is pin gnd. startup of the application is ensured by an internal startup circuit. during the startup, the internal registers of the MC34216A are reset, and the reset pin r s goes high. this signals is meant to indicate to the microcontroller that the programming of the MC34216A can start. when the line current flows, the hook status output pin d/hs goes high. this serves as the information for the microcontroller that the set is of fhook. when the line current is no longer present, the pin goes low again. because the line current is monitored, and not the line voltage, an interrupt of the exchange can be recognized.
MC34216A 11 motorola analog ic device data ac characteristics impedance in f igur e 5, t h e b loc k d iagra m o f t h e m c34216a performing the ac impedance is depicted. as can be seen, it is partly in common with the dc mask block diagram. the part generating the dc mask is replaced by a dc voltage source because for ac, this part has no effect. z21 t3 t2 z0 r5 v c7 v lai sao sai lao gnd r1 MC34216A cc o2 v o1 line + line + + + + figure 5. ac stage of the MC34216A when calculating the ac loop, it can be derived that the set impedance z in equals: z in v line i line r1 1 z0 z21 r1 x z0 z21 as can be noticed, the formula for the ac impedance z in equals the formula for the dc slope in regions 1 and 3. however, because for the dc slopes the resistive part of z0 and z21 are used, the actual values for z in and the dc slopes do not have to be equal. a complex impedance can be made by making either z0 or z21 complex. when z0 is made complex to fit the set impedance, the transmit characteristics will be complex as well. the complex impedance is therefore preferably made via the z21 network. because z21 is in the denominator of the z in formula, z21 will not be a direct copy of the required impedance, but a derivative of it. figure 6 shows the derived network to be used for z21. cb ra rb rv rv rw cw sao lai gnd rv r1 x z0 2 ( ra rb r1 ) rw r1 x z0 ( ra r1 ) 4rb ( ra rb r1 ) cw 4rb 2 x cb r1 x z0 figure 6. derived network for z21 in case of complex set impedance transmit when on pin lai a current is injected, via the loop depicted in figure 5, a signal is created on the line. in this way, the microphone signals and dtmf signals from the internal generator are transmitted. it can be derived that the signal voltage on the line (v line ) depends on the signal current injected in lai (i lai ) according to: v line i lai x z0 x z line z in z line with this relation, a simplified replacement circuit can be made for the transmit amplifier (see figure 7). here the product of i lai and z0 is replaced by one voltage source. z + line z in v line i lai *z0 + figure 7. replacement diagram for the transmit amplifier the m icrophon e s igna l c urren t i s d erive d f ro m t he microphone signal according to the schematic in figure 8. ru cmic cu r mic txi microphone handset ku line agc iu MC34216A microphone threshold v cc r i lai txi mic figure 8. microphone amplifier input stage the input stage in figure 8 consists of a current amplifier with transfer ku and impedance r txi = 1.0 k w plus an attenuator which reduces the signal current at high line currents, the socalled line length regulated gain or line agc. this attenuator can be switched on/of f via the microcontroller . the input current iu within the telephony speech band is derived from the microphone signal according to: iu vu r mic ru r txi vu ru with: v u = signal of the microphone only loaded with r mic . the overall gain from microphone to line (a tx ) now follows as: a tx v line vu ku ru x z0 x z line z in z line practically, the gain can only be varied with z0, ru and r mic .
MC34216A 12 motorola analog ic device data 2.4 v 2v c17 r20 z1 r1 rxo2 1 x imp hyn rxo1 sai handset earpiece c line agc v line + line rxi gnd MC34216A be + v o1 ref load r load g c ear e + + + + figure 9. receive part of the MC34216A the noise which is transmitted to the line can be reduced when the microphone threshold feature is enabled. this is also called squelch. when there is no microphone signal present, the transmit gain is reduced by 7.0 db with respect to nominal. in between, the gain is varied in steps of 1.0 db dependent o n t h e s igna l l evel . t h e d etectio n o f t he microphone signal level is done via an integrator which uses the external capacitors c28 and c29 for timing and filtering. this feature is also very useful to reduce the howling ef fect during listeningin. the m c34216 a o ffer s t h e p ossibilit y t o m ute t he microphone, also called privacy mode. in this case, the far end user no longer hears the local user . it is possible to send during this mode an idle tone to the line to make the far end user aware of this. during pulsedialing, the microphone biasing can be switched of f by programming. pin mic will then be made high impedance, meaning that the microphone dc current no longer f low s i nt o t hi s p in . t hi s r educe s t h e c urrent consumption of the application during pulsedialing. it can also be used to disconnect the handset microphone signal and enable another transmit signal, for instance from a handsfree microphone. receive the receive portion of the MC34216A is shown in figure 9. the receive signal is picked up by the amplifier at the hyn input. this is the same amplifier as present in the dc loop of figure 4. the signal is first converted to current by the transconductance amplifier with transfer g e . the multiplier placed after performs line length dependent gain or line agc. afterwards, the current is converted back to voltage via the external feedback network z load . the resulting voltage is available at output rxo1, and at rxo2 which is the inverted earpiece output. from the diagram of figure 9 the receive gain (a rx ) can be derived as: with : a rx v rxo v line g e x r1 x z load x 1 z h 1 z in z h r1 x z1 r20 , also see the sidetone characteristics below. the earpiece can either be connected as a singleended or as a bridgetied load. the above calculated gain is valid for the singleended case. when connecting as a bridgetied load, the gain is increased by 6.0 db. the MC34216A of fers the possibility to increase the receive gain to the earpiece with an extra 6.0 db via the microcontroller on command of the user of the telephone set. this is useful for people with hearing problems or when the far end user speaks very softly. the MC34216A of fers the possibility to mute the signal coming from the line to the earpiece. this is useful during pulsedialing or to mute the far end user. sidetone when a transmit signal is transmitted to the line, a part of the signal is returned to the receive channel due to the nature of the 2 to 4 wire conversion of the hybrid. during transmit, the signal on the line will be i line x z line . during receive, the signal on the line will be i line x z in . when replacing z in in the formula for the receive gain, it follows that the signal on the earpiece output due to a sending signal on the line will be: v ear v linetransmit g e x r1 x z load x 1 z h 1 z line the sidetone can be minimized by making z h equal to z line . a complex sidetone network can therefore be made via a complex z1. the coupling capacitor c17 in series with r20 is only meant to block dc. line length agc the MC34216A of fers the possibility to vary the transmit and receive gains over line length in order to compensate for the loss in gain at longer line lengths. in the block diagrams of t h e t ransmi t a n d r eceiv e c hannel s t h e a ttenuator performing the line agc is already drawn. the line agc can be switched on/of f via the microcontroller . in case the line agc is switched of f, the transmit and receive gain are lowered 2.0 db with respect to the value calculated via the formulas above. the line agc characteristics for both transmit and receive channels have the general shape depicted in figure 10.
MC34216A 13 motorola analog ic device data il il reduced gain nominal gain gain i gain nominal gain 1 il il start il range range line start figure 10. general line agc characteristics for small line currents, and thus long lines, the gains are nominal. when the line current has increased above il start with a current il range , the gain is reduced by 6.0 db. due to the general characteristics of the line agc curve, the gain will be decreased further for higher currents. for france and the u.k., the line agc will be active in region 3 of the dc characteristics. the il start is approximately equal to the ilk. the range is determined by: il range z1 x ( i2r i2cd ) r e3 for low v oltage mask, the line agc is active in region 2. loudspeaking facility the MC34216A incorporates a loudspeaking facility which facilitates group listeningin with incorporated antihowling circuitry, h andsfre e c onversation w it h e xterna l d uplex controller and ringing via loudspeaker with external switched mode power supply. loudspeaker amplifier the block diagram of the loudspeaker amplifier which is incorporated in the MC34216A is depicted in figure 11. the first part of the loudspeaker amplifier equals the receive part of the earphone amplifier . it therefore also includes the anti sidetone circuit and the line current agc. the overall gain from line to loudspeaker output lpo is therefore: a lsp 1 r30 r28 x r t x g e x r1 x 1 z h 1 z in the gain of the loudspeaker amplifier can be adjusted by the external components as indicated in the formula above. however, the gain is also influenced by line length agc, volume control and the signal limiter agc. the influence of line length agc on the loudspeaker channel is equal to its influence on the receive amplifier of the earpiece because it is in their common path. the volume of the loudspeaker is controlled via the microcontroller. in total, 8 levels can be programmed: 7 levels with equal steps of 4.5 db and one level which completely mutes the loudspeaker amplifier. the output signal is limited by an agc circuit when the peaks of the signal are larger than a certain threshold (peak agc) and when the line current available is not suf ficient (current agc). this prevents distortion of the output signal and a drop of the supply voltage v cc . listeningin during group listeningin, both the handset and the loudspeaker are active. v ia the acoustic coupling from loudspeaker to handset microphone, howling can occur when the handset is held close to the base. in order to reduce howling, a n a ntihowlin g c orrelator a n d a m icrophone threshold are incorporated in the MC34216A. both functions can be switched on/off via the microcontroller. the antihowling correlator monitors the microphone and loudspeaker signal via capacitors c26 through c29. when both signals show a high correlation, then both contain a common signal. in practice, this means that howling is present. in this case, the antihowling correlator will reduce the loudspeaker gain in steps of 1.25 db, until the correlation is below a certain threshold. c24 2.4 v 2v c17 r20 z1 r1 imp hyn sai c23 line agc line + line gnd MC34216A be + v o1 r30 anti howl i volume microphone threshold lpo signal limiter c25 c21 lpi acg r r28 loudspeaker control rx t + + + figure 11. block diagram of the loudspeaker amplifier
MC34216A 14 motorola analog ic device data the microphone threshold reduces the gain in the acoustic feedback loop by 7.0 db. when there is no, or only a small microphone signal, the gain in the transmit path is reduced by 7.0 db with respect to nominal. the loudspeaker gain is then at its nominal value. at a high microphone input current, the microphone gain is back to its nominal value and the loudspeaker gain reduced by 7.0 db. the behavior of the microphone threshold feature is depicted in figure 12. 33 n 110 n a a gain iu (arms) nominal reduced tx lsp figure 12. behavior of the microphone threshold feature handsfree a speakerphone application for handsfree conversation can easily be made with the MC34216A by adding one of the motorola speakerphone cores to it. the txi input can be used to amplify the transmit signal and the earphone output can be used to monitor the receive signal. the receive output of the speakerphone core can be connected to aho1. when programming the MC34216A in speakerphone mode, the signal on this pin will be amplified to the loudspeaker o utput . i n t hi s w ay , t h e f eature s a nd functionality of the MC34216A are optimally used, like its powerful supply , loudspeaker amplifier with antidistortion circuitry and line current regulation. more details about this application can be found in the user manual. ringing the MC34216A offers the possibility to generate a ringing melody via the loudspeaker, which avoids the use of a piezo buzzer. the power needed to supply the loudspeaker is transformed out of the ringer signal by a switched mode power supply tca3385. the melody is generated by the MC34216A and programmed via the microcontroller . this concept is depicted in figure 13. as can be seen in figure 13, the high voltage ring signal is first transformed into a low voltage supply point with high current capability . this is needed because, compared to a piezo resonator , a loudspeaker is low ohmic. in the ringing mode, the voltage of the supply point is stabilized by the MC34216A to 5.5 v . the ringing melody can be programmed via the microcontroller and is generated internally . the output signal level is regulated via a gain control loop. the loop couples the value of v cc to the output current of the ringing melody generator . no ringing melody is made audible when v cc is below 3.8 v and the maximum volume is reached when v cc has reached 5.5 v. to ensure optimum output power under low line current conditions, the current consumption of the MC34216A in ringing mode is reduced down to 2.0 ma. the MC34216A of fers the possibility to listen to the ringing melody while in the speech mode. although the feeding conditions are not equal for ringing and speech mode, this offers the user the possibility to program his own melody and to adjust the volume. hookswitch r4 c4 bus c8 r24 t1 l1 d10 r30 r1 c24 rdo gnd r li ringer supply regulator and melody generator micro- controller lpi lpo gnd off hook application i sai of MC34216A tca3385 MC34216A co drv v c7 cc v cc phone line r in figure 13. concept of ringing via loudspeaker
MC34216A 15 motorola analog ic device data programming possibilities the MC34216A can be programmed by a microcontroller via a 2 wire bus. in this way, it is possible to program the dc mask, dtmf tones, listeningin mode, loudspeaker volume, etc. the b u s i nterfac e o f t h e m icrocontrolle r w it h t he MC34216A consists of 2 wires: a data wire and a clock wire connected to pins d/hs and clk respectively . also, the reset pin rst of the MC34216A is connected to the microcontroller. the MC34216A itself has a local oscillator connected to pin osc. the local oscillator needs a 500 khz parallel mode ceramic resonator , with approximately 75 pf capacitance, c o n n e c t e d t o g r o u n d ( f o r i n s t a n c e , t h e t o k o fcrk500ap35). the local oscillator is the reference for all the internal timings of the MC34216A. the 2 wire bus is based on the sci standard. this standard includes things such as debouncing and bus monitoring in order to check that the data is sent over correctly. the full bus specification is depicted in figure 14. the data is read in during the falling edge of the clock signal. the clock has to be active only during the transfer of the data. after the data is sent, the clock has to be kept low. the d/hs pin is not only the input for the data but also the output for the hookswitch information. when there is line current flowing, this pin will be high, provided that the clock line is low. the reset pin rst of the MC34216A is high for supply voltages on v cc of 3.1 v and higher . it is the indication for the microcontroller that programming of the device is possible. when rst becomes high and d/hs is high as well, the microcontroller can start programming the registers for the speech mode. when information from the ringer indicates that t her e i s a r in g s igna l p resen t o n t h e l ine , t he microcontroller can start programming the registers for ringing mode. the registers of the MC34216A are 8bits wide. the register bits are shown in figure 15. the 8bits can be split up into 2 address bits and 6 data bits of the format a1a0d5d4d3d2d1d0. data is sent over starting with the address bits (a1 and a0) and then the data bits, d5 through d0. during s tartu p o f t h e m c34216a, t h e r egister s a re internally reset in order to have a defined state. the contents of the registers after the reset are also given in figure 15. in summary, it starts up with l v mask and handset mode with the transducers muted. ti tclk t(on) tds tdh clk d/hs t1 clk d/hs figure 14. bus specification symbol description min max unit tclk t(on) tds tdh td ti t1 vihc vilc vihd vild clock period high level duration data setup time data hold time debounce time data reset time to first clock rising edge interval between 2 successive 8bit words high input level clock low input level clock high input level data low input level data 125 66 10 20 16 40 700 0.7 0.0 1.7 0.0 1000 ton 900 5.0 0.3 5.0 1.2 m s m s m s m s m s m s m s vdc vdc vdc vdc tclk t(on) tds tdh td ti t1 vihc vilc vihd vild clock period high level duration data setup time data hold time debounce time data reset time to first clock rising edge interval between 2 successive 8bit words high input level clock low input level clock high input level data low input level data 125 66 10 20 16 40 700 0.7 0.0 1.7 0.0 1000 ton 900 5.0 0.3 5.0 1.2 m s m s m s m s m s m s m s vdc vdc vdc vdc t(on) tds tdh td ti t1 vihc vilc vihd vild high level duration data setup time data hold time debounce time data reset time to first clock rising edge interval between 2 successive 8bit words high input level clock low input level clock high input level data low input level data 66 10 20 16 40 700 0.7 0.0 1.7 0.0 ton 900 5.0 0.3 5.0 1.2 m s m s m s m s m s m s vdc vdc vdc vdc tds tdh td ti t1 vihc vilc vihd vild data setup time data hold time debounce time data reset time to first clock rising edge interval between 2 successive 8bit words high input level clock low input level clock high input level data low input level data 10 20 16 40 700 0.7 0.0 1.7 0.0 ton 900 5.0 0.3 5.0 1.2 m s m s m s m s m s vdc vdc vdc vdc tdh td ti t1 vihc vilc vihd vild data hold time debounce time data reset time to first clock rising edge interval between 2 successive 8bit words high input level clock low input level clock high input level data low input level data 20 16 40 700 0.7 0.0 1.7 0.0 900 5.0 0.3 5.0 1.2 m s m s m s m s vdc vdc vdc vdc td ti t1 vihc vilc vihd vild debounce time data reset time to first clock rising edge interval between 2 successive 8bit words high input level clock low input level clock high input level data low input level data 16 40 700 0.7 0.0 1.7 0.0 5.0 0.3 5.0 1.2 m s m s m s vdc vdc vdc vdc ti t1 vihc vilc vihd vild data reset time to first clock rising edge interval between 2 successive 8bit words high input level clock low input level clock high input level data low input level data 40 700 0.7 0.0 1.7 0.0 5.0 0.3 5.0 1.2 m s m s vdc vdc vdc vdc t1 vihc vilc vihd vild interval between 2 successive 8bit words high input level clock low input level clock high input level data low input level data 700 0.7 0.0 1.7 0.0 5.0 0.3 5.0 1.2 m s vdc vdc vdc vdc vihc vilc vihd vild high input level clock low input level clock high input level data low input level data 0.7 0.0 1.7 0.0 5.0 0.3 5.0 1.2 vdc vdc vdc vdc vilc vihd vild low input level clock high input level data low input level data 0.0 1.7 0.0 0.3 5.0 1.2 vdc vdc vdc vild low input level data 0.0 1.2 vdc
MC34216A 16 motorola analog ic device data figure 15. register description address data symbol function state at reset a1, a0 = 00 d0 micm microphone mute 0 = muted d1 em earphone mute 0 = muted d2 ld loop disconnect 0 = loop closed d3 pt pilot tone 0 = tone aoffo d4 it idle tone 0 = tone aoffo d5 micp microphone power 0 = power aoffo a1, a0 = 01 d0 mfc0 tone control 0, see tables below d1 mfc1 tone control 0, see tables below d2 mf0 tone select 0, see tables below d3 mf1 tone select 0, see tables below d4 mf2 tone select 0, see tables below d5 mf3 tone select 0, see tables below a1, a0 = 10 d0 r/s ring/speech mode 0 = speech mode d1 ea earphone gain 6.0 db 0 = nominal gain d2 g0 loudspeaker gain 0, see tables below d3 g1 loudspeaker gain 0, see tables below d4 g2 loudspeaker gain 0, see tables below d5 rt ring tone 0 = tone aoffo a1, a0 = 11 d0 dcm0 dc mask control 0, see tables below d1 dcm1 dc mask control 1, see tables below d2 sp speakerphone mode 0 = aoffo d3 gr line length regulation 0 = aono d4 hpi antihowling 0 = aono d5 m th microphone threshold 0 = aono mfc1 mfc0 function 0 0 switch dtmf generation aoffo 0 1 select dtmfpair and generate 1 0 select pilot/idle/ring tone frequency 1 1 select dtmf/idle tone level (level i lai ) dcm1 dcm0 function 0 0 startup mask for france 0 1 u.k. mask 1 0 low voltage mask 1 1 french mask g2 g1 g0 function 0 0 0 loudspeaker amplifier muted 0 0 1 gain reduction 27.0 db 0 1 0 gain reduction 22.5 db 0 1 1 gain reduction 18.0 db 1 0 0 gain reduction 13.5 db 1 0 1 gain reduction 9.0 db 1 1 0 gain reduction 4.5 db 1 1 1 no attenuation, nominal gain
MC34216A 17 motorola analog ic device data figure 16. register description mf3 mf2 mf1 mf0 mfc1 = 0, mfc0 = 1 mfc1 = 1, mfc0 = 0 mf3 mf2 mf1 mf0 dtmfpair (in hz) single tone (in hz) mf3 mf2 mf1 mf0 low high key single tone (in hz) 0 0 0 0 941 1633 d 440 0 0 0 1 941 1477 # 494 0 0 1 0 941 1336 0 523 0 0 1 1 941 1209 * 554 0 1 0 0 852 1633 c 587 0 1 0 1 852 1477 9 622 0 1 1 0 852 1336 8 659 0 1 1 1 852 1209 7 698 1 0 0 0 770 1633 b 784 1 0 0 1 770 1477 6 880 1 0 1 0 770 1336 5 988 1 0 1 1 770 1209 4 1047 1 1 0 0 697 1633 a 1319 1 1 0 1 697 1477 3 1661 1 1 1 0 697 1336 2 1760 1 1 1 1 697 1209 1 2093 the dc mask of the MC34216A can be programmed to fit the dif ferent country requirements. during startup, this will be the first register which has to be programmed in order to have a dc setting as soon as possible. the p ulsedialin g i s t ime d b y t h e m icrocontroller (make/brake ratio, interdigit pause) by making the ld bit high and low . also, memory dialing or last number redial can be done. during ld = 1, the MC34216A makes its output lao low for the line break and reduces its internal current consumption. the current through the microphone can be stopped also by making bit micp low. the transmit path can be muted by making the micm bit low. it ef fectively mutes both the signal from the handset microphone a s w el l a s t h e s igna l c omin g f ro m a speakerphone circuit. during this microphone mute state, a melody can be sent to the line (melody on hold). in order to enable the idle tone function, the it bit has to be made high. the squelch function can be enabled by making the m th bit low. the line agc feature can be enabled by making the gr bit low. the receive path can be muted by making the em bit low. it ef fectively mutes both the signal from the line to the handset earpiece as well as to the loudspeaker output. during this mute state, a pilot tone melody can be sent to the earpiece o r l oudspeaker . t hi s i s v er y u sefu l d uring pulsedialing , p rogrammin g o f t elephon e n umber s i n memories or during operation of an answering or fax machine. in order to enable the pilot tone function, the pt bit has to be made high. the gain of the earphone amplifier can be increased by 6.0 db by making the ea bit high.
MC34216A 18 motorola analog ic device data the MC34216A incorporates a dtmf generator with integrated filters. the dtmf pairs can be selected by the microcontroller via the mf bits. in this way , the whole dtmf range for a 4x4 keyboard is available which fulfills the ccitt requirements. the dtmf level on the line can be adjusted by external components and it can also be programmed via the mf bits. for listeningin operation, the loudspeaker has to be switched o n a n d t h e a ntihowlin g c ircuitr y h a s t o b e activated. the loudspeaker is switched on by making the g2g1g0 b it s h igh . t he y a ls o s e t t h e v olume . t he antihowling circuit is activated by making bit hpi low . by making bit m th high, the microphone threshold feature is enabled which further reduces the effect of howling. by making the sp bit high, the speakerphone mode is programmed. this automatically disables the earpiece by muting the rxo2 output, and it enables the aho1 input as a speakerphone signal input. by making the micp bit low , the handset microphone is no longer powered and is thus muted. this ensures that only the signal from the base microphone is transmitted to the line. by m akin g t h e r / s b i t h igh , t h e r ingin g m od e i s programmed. the ringing melody is programmed via the microcontroller a n d g enerate d b y t h e m c34216a . t he volume can be programmed via the 3 loudspeaker gain bits g2g1g0. the ring melody is enabled by making the ring tone switch r t high. the melody can be tested during normal speech mode by activating the ring tone switch r t while r/s is low. the answering machine mode is entered by making the r/s bit high. this enables the microphone, earphone and loudspeaker amplifiers while the set is onhook. this makes it possible to record a message with the handset microphone and to playback messages via the earpiece or loudspeaker . other blocks of the circuit are not activated. during offhook operation, the incoming messages can be recorded and the outgoing message can be played in the normal way . more details about the answering machine application can be found in the user manual. support material device specification: brief description o f th e m c34216a, block diagram, device data, bus specification, test diagram, typical application user manual MC34216A: extended description of the circuit and its concept, description of the programmability, adjustment procedure, application hints and proposals demonstration board: performance of the MC34216A is shown in an application with the tca3385 switched mode power supply and a mc68hc705 microcontroller adjustment software: a qbasic program which helps the customer to find the right component values for fulfilling the requirements register display board: visualizes the register contents which are transmitted on the demonstration board by means of leds
MC34216A 19 motorola analog ic device data 6 line + to imp to sai r13 r16 r12 c16 c12 r21 r20 c17 to imp t2 hyn cm ndc sao lai imp i rxo1 c20 v c7 r6 rxo2 agnd rxi gnd r9 c5 txi t3 lao mic rs to microcontroller clk d/hs r1 c30 r15 c11 c14 to hyn c13 c32 c31 r5 c2 r31 r7 from v 26 27 25 7 21 5 22 8 19 18 17 14 9 13 20 10 12 11 line c35 c3 c19 c34 lpo lpi 23 24 r29 c22 c21 r28 c23 r30 c24 c6 c25 agc 28 aho1 aho2 mtf mtc sai osc x1 c26 c27 c28 c29 to imp 1 2 3 4 15 16 MC34216A r14 c10 component value lv value f value u.k. component value lv value f value u.k. component value lv, f , u.k. r1 20 15 15 c2 470 p c22 100 n r5 820 c3 220 p c23 330 p r6 150 k c5 10 n c24 47 r7 1.0 k c6 22 n c25 220 n r9 39 k c7 470 c26 220 n r12 69.8 k c10 0 4.7 n 330 p c27 220 n r13 560 k 560 k 330 k c11 220 p 470 p 470 p c28 15 n r14 0 620 k 620 k c12 10 n 1.0 n 10 n c29 100 n r15 750 k 620 k 620 k c13 470 p c30 10 r16 150 k 120 k 120 k c14 470 p c31 100 n r20 7.5 k 5.1 k 13 k c16 470 n c32 1.0 n r21 20 k 16.2 k 15 k c17 680 n c34 4.7 n r28 10 k c19 100 n c35 2.2 r29 10 c20 10 t2 mje350 r30 220 k c21 68 n t3 mpsa42 r31 1.8 k x1 500 khz figure 17. t ypical application m m m m cc ref cc m + + lv = low v oltage mode f = france u.k. = united kingdom handset earpiece handset microphone speaker
MC34216A 20 motorola analog ic device data dw, dwf suffix plastic package case 751f04 issue e outline dimensions min min max max millimeters inches dim a b c d f g j k m p r 17.80 7.40 2.35 0.35 0.41 0.23 0.13 0 10.05 0.25 18.05 7.60 2.65 0.49 0.90 0.32 0.29 8 10.55 0.75 0.701 0.292 0.093 0.014 0.016 0.009 0.005 0 0.395 0.010 0.711 0.299 0.104 0.019 0.035 0.013 0.011 8 0.415 0.029 1.27 bsc 0.050 bsc notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: millimeter. 3. dimension a and b do not include mold protrusion. 4. maximum mold protrusion 0.15 (0.006) per side. 5. dimension d does not include dambar protrusion. allowable dambar protrusion shall be 0.13 (0.005) total in excess of d dimension at maximum material condition. -a- -b- 1 14 15 28 -t- c seating plane 0.010 (0.25) b m m m j -t- k 26x g 28x d 14x p r x 45 f 0.010 (0.25) t a b m s s motorola reserves the right to make changes without further notice to any products herein. motorola makes no warranty , representation or guarantee regarding the suitability of its products for any particular purpose, nor does motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability , including without limitation consequential or incidental damages. at ypicalo parameters can and do vary in dif ferent applications. all operating parameters, including at ypicalso must be validated for each customer application by customer ' s technical experts. motorola does not convey any license under its patent rights nor the rights of others. motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body , or other applications intended to support or sustain life, or for any other application in which the failure of the motorola product could create a situation where personal injury or death may occur . should buyer purchase or use motorola products for any such unintended or unauthorized application, buyer shall indemnify and hold motorola and its of ficers, employees, subsidiaries, af filiates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly , any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that motorola was negligent regarding the design or manufacture of the part. motorola and are registered trademarks of motorola, inc. motorola, inc. is an equal opportunity/af firmative action employer . how to reach us: usa / europe : motorola literature distribution; japan : nippon motorola ltd.; tatsumispdjldc, toshikatsu otsuki, p.o. box 20912; phoenix, arizona 85036. 18004412447 6f seibubutsuryucenter, 3142 tatsumi kotoku, tokyo 135, japan. 0335218315 mfax : rmf ax0@email.sps.mot.com t ouchtone (602) 2446609 hong kong : motorola semiconductors h.k. ltd.; 8b tai ping industrial park, internet : http://designnet.com 51 ting kok road, tai po, n.t., hong kong. 85226629298 MC34216A/d
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Price & Availability of MC34216A

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