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d a t a sh eet product speci?cation file under integrated circuits, ic03a march 1994 integrated circuits tea1064a low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting
march 1994 2 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a general description the tea1064a is a bipolar integrated circuit that performs all the speech and line interface functions required in fully electronic telephone sets. it performs electronic switching between dialling and speech and has a powerful dc supply for peripheral circuits. the ic operates at line voltages down to 1.8 v dc (with reduced performance) to facilitate the use of more telephone sets connected in parallel. the transmit signal on the line is dynamically limited (speech-controlled) to prevent distortion at high transmit levels of both the sending signal and the sidetone. features low dc line voltage; operates down to 1.8 v (excluding polarity guard) voltage regulator with low voltage drop and adjustable static resistance dc line voltage adjustment facility provides a supply for external circuits in two options: unregulated supply, regulated line voltage; stabilized supply, line voltage varies with supply current dynamic limiting (speech-controlled) in transmit direction prevents distortion of line signal and sidetone symmetrical high-impedance inputs (64 k w ) for dynamic, magnetic or piezo-electric microphones asymmetrical high-impedance input (32 k w ) for electret microphones dtmf signal input confidence tone in the earpiece during dtmf dialling mute input for disabling speech during pulse or dtmf dialling power-down input for improved performance during pulse dial or register recall (flash) receiving amplifier for magnetic, dynamic or piezo-electric earpieces large amplification setting ranges on microphone and earpiece amplifiers line loss compensation (line current dependent) for microphone and earpiece amplifiers (not used for dtmf amplifier) gain control curve adaptable to exchange supply automatic disabling of the dtmf amplifier in extremely-low voltage conditions microphone mute function available with switch package outlines notes 1. sot146-1; 1998 jun 18. 2. sot163-1; 1998 jun 18. tea1064a :20-lead dil; plastic (sot146). (1) TEA1064AT:20-lead mini-pack; plastic (so20; sot163a). (2)
march 1994 3 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a fig.1 block diagram. handbook, full pagewidth + mgr056 current reference start circuit dynamic limiter low voltage circuit agc circuit supply and reference 17 11 v ee reg agc stab dls/mmute slpe gas2 gas1 qr - qr + gar ln v cc1 15 14 12 db 8 9 + - + - 18 10 7 20 13 ir mic + mic - dtmf mute pd + - + - - 1 16 tea1064a 6 5 4 2 v cc2 19 3
march 1994 4 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a quick reference data parameter conditions symbol min. typ. max. unit operating ambient temperature range t amb - 25 -+ 75 c line current operating range: normal operation l line 11 - 140 (1) ma with reduced performance l line 2 - 11 ma internal supply current: power-down input low v cc1 = 2.8 v i cc1 - 1.3 1.6 ma power-down input high v cc1 = 2.8 v i cc1 - 60 82 m a voltage gain range: microphone amplifier g v 44 - 52 db receiving amplifier g v 20 - 45 db line loss compensation: gain control range g v 5.7 6.1 6.5 db exchange supply voltage range v exch 36 - 60 v exchange feeding bridge resistance range r exch 400 - 1000 w maximum output voltage swing on ln (peak-to-peak value) r15 + r16 = 448 w l line =15ma i p = 2 ma v ln(p-p) 3.7 3.95 4.2 v i p = 4 ma v ln(p-p) 3.0 3.25 3.5 v regulated line voltage application r15 = 0 w ; r16 = 392 w supply for peripherals l line =15ma i p = 1.4 ma v p 2.5 -- v i p = 2.7 ma; r reg-slpe =20k w v p 2.9 -- v dc line voltage l line =15ma without r reg-slpe v ln - 3.57 - v r reg-slpe =20k w v ln - 4.57 - v
march 1994 5 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a note 1. for TEA1064AT the maximum line current depends on the heat dissipating qualities of the mounted device. stabilized supply voltage application r15 = 392 w ; r16 = 56 w supply for peripherals l line = 15 ma i p = 0 to 4 ma v cc2-slpe 3.05 3.3 3.55 v dc line voltage l line =15ma i p = 2 ma v ln 4.2 4.4 4.8 v i p = 4 ma v ln 4.9 5.1 5.5 v parameter conditions symbol min. typ. max. unit pinning fig.2 pinning diagram. handbook, halfpage ln gas1 gas2 qr - qr + gar dls/mmute mic - mic + stab slpe v cc2 agc reg pd mute v cc1 ir dtmf v ee 1 2 3 4 5 6 7 8 9 10 11 12 20 19 18 17 16 15 14 13 tea1064a mgr057 1 ln positive line terminal 2 gas1 gain adjustment; transmitting ampli?er 3 gas2 gain adjustment; transmitting ampli?er 4qr - inverting output, receiving ampli?er 5qr + non-inverting output, receiving ampli?er 6 gar gain adjustment; receiving ampli?er 7 dls/ mmute decoupling for transmit ampli?er dynamic and microphone mute input 8 mic - inverting microphone input 9 mic + non-inverting microphone input 10 stab current stabilizer 11 v ee negative line terminal 12 dtmf dual-tone multi-frequency input 13 ir receiving ampli?er input 14 mute mute input 15 pd power-down input 16 v cc1 internal supply decoupling 17 reg voltage regulator decoupling 18 agc automatic gain control input 19 v cc2 reference voltage with respect to slpe 20 slpe slope adjustment for dc curve/reference for peripheral circuits.
march 1994 6 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a functional description supplies v cc1 , v cc2 , ln, slpe, reg and stab (fig.3) power for the tea1064a and its peripheral circuits is usually obtained from the telephone line. the ic develops its own supply voltage at v cc1 and regulates its voltage drop. the internal supply requires a decoupling capacitor between v cc1 and v ee . the internal current stabilizer is set by a 3.6 k w resistor between stab and v ee . the dc current flowing into the set is determined by the exchange supply voltage v exch , the feeding bridge resistance r exch , the subscriber line dc resistance r line and the dc voltage (including polarity guard) on the subscriber set (see fig.3). the internal voltage regulator generates a temperature-compensated reference voltage that is available between v cc2 and slpe [v ref =v cc2-slpe = 3.3 v (typ.)]. this internal voltage regulator requires decoupling by a capacitor between reg and v ee (c3). the reference voltage can be used to: regulate directly the line voltage (stabilized v ln-slpe =v cc2-slpe ) (1) to stabilize the supply voltage for peripherals. regulated line voltage in this application the v cc2 pin is connected to the ln pin as shown in fig.3. this configuration gives a stabilized voltage across pins ln and slpe which, applied via the low-pass filter r16, c15, provides a supply to the peripherals that is independent of the line current and depends only on the peripheral supply current. the value of r16 and the level of the dc voltage v ln-slpe determine the supply capabilities. in the basic application r16 = 392 w and c15 = 220 m f. the worst-case peripheral supply current as a function of supply voltage is shown in fig.4. to increase the supply capabilities, the dc voltage v ln-slpe can be increased by using r va(reg-slpe) or by decreasing the value of r16. (1) the tea1064a application with regulated line voltage is the same as is used for tea1060/tea1061, tea1067 and tea1068 integrated circuits. fig.3 application with regulated line voltage (stabilized v ln-slpe ). the voltage v ln-slpe is fixed to v ref = 3.3 0.25 v. resistor r16 together with the line current determine the supply capabilities and the maximum output swing on the line (no loop damping is necessary). the line voltage v ln =v ref + ([i line - 1.55 ma] r9). handbook, full pagewidth mgr058 r exch r line i line v exch dc ac 17 reg c3 r5 r9 10 stab 20 slpe ln 1 v cc1 16 19 v cc2 11 v ee 0.25 ma r1 i slpe i cc1 r16 c1 c15 peripheral circuits v p i p tea1064a i p + 0.25 ma
march 1994 7 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a the maximum ac output swing on the line at low line currents is influenced by r16 (limited by current) and the maximum output swing on the line at high line currents is influenced by the dc voltage v ln-slpe (limited by voltage). in both these situations, the internal dynamic limiter in the sending channel prevents distortion when the microphone input is overdriven. the maximum ac output swing on ln is shown in fig.5; practical values for r16 are from 200 to 600 w and this influences both the maximum output swing at low line currents and the supply capabilities. the slpe pin is the ground reference for peripheral circuits, therefore inputs mute, pd and dtmf are also referenced to slpe. active microphones can be supplied between v cc1 and v ee . low-power circuits that provide only mute and/or pd inputs to the tea1064a also can be powered from v cc1 . however v cc1 cannot be used for circuits that provide dtmf signals to the tea1064a because v cc1 is referred to ground. if the line current l line exceeds i cc1 + 0.25 ma, the voltage converter shunts the excess current to slpe via ln; where i cc1 ? 1.3 ma, the value required by the ic for normal operation. fig.4 minimum supply current for peripherals (i p ) as a function of the peripheral supply voltage (v p ). handbook, halfpage 2 5 0 1 mgr059 2 3 4 34 v p (v) i p (ma) r va (reg-slpe) = 20 k w without r va (reg-slpe) l line = 15 ma; r16 = 392 w ; r15 = 0 w ; valid for mute = 0 and 1. line current has very little influence the dc line voltage on ln is: v ln =v ln-slpe + (i slpe r9) v ln =v ref + ([i line - i cc1 - 0.25 10 - 3 a] r9) in which v ref = 3.3 v 0.25 v is the internal reference voltage between v cc2 and slpe; its value can be adjusted by external resistor r va r9 = external resistor between slpe and v ee (20 w in basic application). with r9 = 20 w , this results in: v ln = 3.57 0.25 v at l line =15ma v ln = 4.17 0.3 v at l line =15ma, r va(reg-slpe) =33k w v ln = 4.57 0.35 v at l line = 15 ma, r va(reg-slpe) =20k w the preferred value for r9 is 20 w . changing r9 influences microphone gain, dtmf gain, the gain control characteristics, sidetone, and the dc characteristics (especially the low voltage characteristics). in normal conditions, i slpe >> (i cc1 + 0.25 ma) and the static behaviour is equivalent to a voltage regulator diode with an internal resistance of r9. in the audio frequency range the dynamic impedance is determined mainly by r1. the equivalent impedance of the circuit in the audio frequency range is shown in fig.6. the internal reference voltage v cc2-slpe can be increased by external resistor r va(reg-slpe) connected between reg and slpe. the supply voltage v cc2-slpe is shown as a function of r va(reg-slpe) in fig.7. changing the reference voltage influences the output swing of both sending and receiving amplifiers. at line currents below 8 ma (typ.), the dc voltage dropped across the circuit is adjusted to a lower level automatically (approximately 1.8 v at 2 ma). this gives the possibility of operating more telephone sets in parallel with dc line voltages (excluding polarity guard) down to an absolute minimum of 1.8 v. at line currents below 8 ma (typ.), the circuit has limited sending and receiving levels.
march 1994 8 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a fig.5 maximum ac output swing on the line as a function of line current with peripheral supply current as a parameter: r15 = 0 w ; r16 = 392 w . handbook, halfpage 10 6 4 2 0 20 30 mgr060 i line (ma) v ln(p-p) (v) i p = 0 ma 2 ma 4 ma fig.6 equivalent impedance between ln and v ee in the application with stabilized v ln-slpe : r15 = 0 w l eq =c3 r9 r p r p =15k w handbook, halfpage mgr061 r9 20 w reg ln c3 4.7 m f r p v ref l eq v cc1 v ee c1 r1 fig.7 internal reference voltage v cc2-slpe as a function of resistor r va(reg-slpe) for line currents between 11 and 140 ma. in the stabilized supply application: v ln =v cc2-slpe + ([i p + 0.25 10 - 3 a] r15) + ([i line - 1.55 10 - 3 a] r9) in the unregulated supply application (r15 = 0 w ): v ln =v cc2-slpe + ([i line - 1.55 10 - 3 a] r9) handbook, full pagewidth 7.8 3.0 080 40 120 mgr062 4.2 5.4 6.6 r va (reg-slpe) (k w ) v ref (v) with r va infinite
march 1994 9 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a stabilized peripheral supply voltage the configuration shown in fig.8 provides a stabilized voltage across pins v cc2 and slpe for peripheral circuits (such as dialling and control circuits); the dc voltage v ln now varies with the peripheral supply current. the v cc2-slpe supply must be decoupled by capacitor c15. for stable loop operation, resistor r16 ( ? 50 w ) is connected between v cc2 and slpe in series with c15. the voltage regulator control loop is completed by resistor r15 between ln and v cc2 . for sets with an impedance of 600 w , practical values are: r15 = 200 to 600 w ; c15 = 220 m f; c3 = 470 nf. the ratio r15/r16 8 is for stable loop operation with sufficient phase margin, and r15/r16 3 6 is for satisfactory set impedance in the audio frequency range. for sets with complex impedance, the value of c3 and the ratio r15/r16 are different (further information is given in the tea1064a application report (1) ). the peripheral supply capability depends mainly on the available line current, the required ac output swing on the line, the maximum permitted dc voltage on the line and the values of external components (especially r15). with r15 = 392 w and r16 = 56 w (basic application) the maximum possible ac output swing on the line as a function of line current is as shown in fig.9, the curve parameter is the peripheral supply current (i p ). different values for r15 (from 200 to 600 w ) maintaining 6 < r15/r16 < 8 give different results (these are described in the tea1064a application report (1) . (1) supplied on request. fig.8 application with stabilized supply voltage for peripheral circuits: r15 = 392 w ; r16 = 56 w . handbook, full pagewidth mgr063 r exch r line i line v exch dc ac 17 reg c3 r5 r9 10 stab 20 slpe ln 1 v cc1 16 19 v cc2 11 v ee 0.25 ma r1 r15 i slpe i cc1 r16 c1 c15 peripheral circuits v p i p tea1064a i p + 0.25 ma
march 1994 10 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a the dc line voltage on ln is v ln =v ln-slpe + (i slpe r9). therefore v ln =v ref + ([i p + 0.25 10 - 3 a] r15) + ([l line - i cc1 - 0.25 10 - 3 a] r9) in which: v ref is the internal reference voltage between v cc2 and slpe (the value of v ref can be adjusted by an external resistor, r va ). v ref = 3.3 v (typ.) without r va i p is the supply current used by peripheral circuits r15 is an external resistor between ln and v cc2 (392 w in the basic application) r9 is an external resistor between slpe and v ee (20 w in the basic application) the dc voltage v ln-slpe as a function of i p with r15 as a parameter is shown in fig.10. in the audio frequency range, the dynamic impedance is determined mainly by r1. the equivalent impedance in the audio range of the circuit (fig.8) is shown in fig.11. fig.9 maximum output swing on line as a function of line current with the peripheral supply current as a parameter; r15 = 392 w ; r16 = 56 w . as different values of r15 and r16 are allowed, different curves would then apply handbook, halfpage 10 8 4 6 2 0 20 30 mgr064 i line (ma) v ln(p-p) (v) i p = 4 ma 2 ma 0 ma fig.10 curves showing the typical voltage drop between ln and slpe as a function of the supply current for peripherals with r15 as a parameter: v cc2-slpe = 3.3 v (r va not connected). v cc2-slpe can be adjusted between approximately 3.3 and 4.3 v by changing the value of r va , this results in a parallel-shift of the curves. the total voltage drop v ln ? v ln-slpe + ([i line - 1.55 ma] r9). handbook, halfpage 012 4 5.5 3.0 5.0 mgr065 3 4.0 4.5 3.5 i p (ma) v ln-slpe (v) r15 = 511 w 392 w 301 w fig.11 equivalent impedance between ln and v ee at f > 300 hz in the application with stabilized supply voltage for peripheral circuits. r eq r p r15 r16 ---------- - 1 + ? ?? = l eq c3 r9 r eq with r p 15 k w = = handbook, halfpage mgr066 r9 20 w ln c3 470 nf r eq l eq v ee r1 620 w
march 1994 11 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a microphone inputs mic + and mic - and gain pins gas1 and gas2 the tea1064a has symmetrical microphone inputs, its input impedance is 64 k w (2 32 k w ) and its voltage amplification is typ. 52 db with r7 = 68 k w . either dynamic, magnetic or piezo-electric microphones can be used, or an electret microphone with a built-in fet buffer. arrangements for the microphone types are shown in fig.12. the gain of the microphone amplifier is proportional to external resistor r7 connected between gas1 and gas2 and with this it can be adjusted between 44 db and 52 db to suit the sensitivity of the transducer. an external 100 pf capacitor (c6) is required between gas1 and slpe to ensure stability. a larger value of c6 may be chosen to obtain a first-order low-pass filter with a cut-off frequency corresponding to the time constant r7 c6. fig.12 microphone arrangements: a) magnetic or dynamic microphone, the resistor (1) may be connected to reduce the terminating impedance, or for sensitive types a resistive attenuator can be used to prevent overloading the microphone inputs; b) electret microphone; c) piezo-electric microphone. handbook, full pagewidth mgr067 v ee v cc1 16 8 9 11 9 8 (1) (a) (b) (c) mic + mic - mic - mic + 9 8 mic - mic + dynamic limiter (microphone) pin dls/ mmute a low level at the dls/ mmute pin inhibits the microphone inputs mic + and mic - but has no influence on the receiving and dtmf amplifiers. removing the low level at the dls/ mmute pin provides the normal function of the microphone amplifier after a short time determined by the capacitor connected to dls/ mmute pin. the microphone mute function can be realised by a simple switch as shown in fig.13. to prevent distortion of the transmitted signal, the gain of the sending amplifier is reduced rapidly when peaks of the signal on the line exceed an internally-determined threshold. the time in which gain reduction is effected (attack time) is very short. the circuit stays in the gain-reduced condition until the peaks of the sending signal remain below the threshold level. the sending gain then returns to normal after a time determined by the capacitor connected to dls/ mmute (release time). the internal threshold adapts automatically to the dc voltage setting of the circuit (voltage v ln-slpe ). this means that the maximum output swing on the line will be higher if the dc voltage dropped across the circuit is increased. fig.14 shows the maximum possible output swing on the line as a function of the dc voltage drop (v ln-slpe ) with i line - i p as a parameter. fig.13 microphone-mute function. handbook, halfpage mgr068 r17 3.3 k w 7 11 dls/mmute v ee
march 1994 12 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a fig.14 maximum output swing on line as a function of the dc voltage drop v ln-slpe with l line - i p as a parameter: r15 = 392 w ; r16 = 56 w ; or r15 = 0 w and r16 = 392 + 56 = 448 w . handbook, full pagewidth 5.5 11 13 15 17 19 21 23 25 10 0 3 3.5 4 4.5 5 2 4 6 8 v ln(p-p) (v) v ln -v slpe (v) i line -i p (ma) mgr069 the internal threshold level is lowered automatically if the dc current in the transmit output stage is insufficient. this prevents distortion of the sending signal in applications using parallel-connected telephones or telephones operating over long lines, for example. dynamic limiting also considerably improves sidetone performance in over-drive conditions (less distortion; limited sidetone level). receiving ampli?er ir, qr + , qr - and gar the receiving amplifier has one input ir and two complementary outputs, qr + (non-inverting) and qr - (inverting). these outputs may be used for single-ended or differential drive, depending on the type and sensitivity of the earpiece used (see fig.15). gain from ir to qr + is typically 31 db with r4 = 100 k w , sufficient for low-impedance magnetic or dynamic earpieces which are suitable for single-ended drive. by using both outputs (differential drive) the gain is increased by 6 db. differential drive can be used when the earpiece impedance exceeds 450 w as with high-impedance dynamic, magnetic or piezo-electric earpieces. fig.15 alternative receiver arrangements: a) dynamic earpiece with an impedance less than 450 w ; b) dynamic earpiece with an impedance more than 450 w ; c) magnetic earpiece with an impedance more than 450 w, resistor (1) may be connected to prevent distortion (inductive load); d) piezo-electric earpiece, resistor (2) is required to increase the phase margin (stability with capacitive load). handbook, full pagewidth mgr070 (1) qr - qr + 5 4 v ee 11 qr - qr + 5 4 qr - qr + 5 4 (2) qr - qr + 5 4 (a) (b) (c) (d)
march 1994 13 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a the output voltage of the receiving amplifier is specified for continuous-wave drive. fig.16 shows the maximum output swing of the receiving amplifier as a function of the dc voltage drop (v ln ). the maximum output voltage will be higher under speech conditions, where the ratio of the peak to the rms value is higher. the gain of the receiving amplifier can be adjusted to suit the sensitivity of the transducer used. the adjustment range is between 20 db and 39 db with single-ended drive and between 26 db and 45 db with differential drive. the gain is proportional to the external resistor r4 connected between gar and qr + . the overall gain between ln and qr + can be found by subtracting the attenuation of the anti-sidetone network (32 db) from the amplifier gain. two external capacitors (c4 =100 pf and c7 = 10 c4 = 1 nf) ensure stability. a larger value may be chosen to obtain a first-order low-pass filter. the cut-off frequency corresponds with the time constant r4 c4. the relationship c7 = 10 c4 must be maintained. fig.16 maximum output swing of the receiving amplifier as a function of dc voltage drop v ln with the load at the receiver output as parameter: valid for both supply options; thd = 2%; i line = 15 ma. curve (1) is for a differential load of 47 nf (series resistance = 100 w ); f = 3400 hz. curve (2) is for a differential load of 450 w ; f = 1 khz. curve (3) is for a single-ended load of 150 w ; f = 1 khz. handbook, halfpage 0 34 6 1.5 0.5 1.0 mgr071 5 v ln (v) v qr(rms) (v) (2) (3) (1) automatic gain control input agc automatic compensation of line loss is obtained by connecting a resistor (r6) between agc and v ee . this automatic gain control varies the gain of the microphone amplifier and receiving amplifier in accordance with the dc line current. the control range is 6.1 db; this corresponds to a 5 km line of 0.5 mm diameter copper twisted-pair cable (dc resistance = 176 w /km, average attenuation = 1.2 db/km). the dtmf gain is not affected by this feature. the value of r6 must be chosen with reference to the exchange supply voltage and its feeding bridge resistance (see fig.17 and table 1). different values of r6 give the same line current ratios at the start and the end of the control range. if automatic line-loss compensation is not required the agc pin can be left open, the amplifiers then give their maximum gain.
march 1994 14 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a fig.17 variation of gain as a function of line current with r6 as a parameter; r9 = 20 w . handbook, full pagewidth mgr072 - 6 - 5 - 4 - 3 - 2 - 1 0 d a vd (db) i line (ma) 80 90 60 70 40 50 20 30 10 93.1 k w 66.5 k w r6 = r6 = 118 k w table 1 values of r6 giving optimum line-loss compensation at various values of exchange supply voltage (v exch ) and exchange feeding bridge resistance (r exch ); r9 = 20 w . mute input (see notes 1. and 2.) mute = high enables the dtmf input and inhibits the microphone and receiving amplifier inputs. mute = low or open-circuit disables the dtmf input and enables the microphone and receiving amplifier inputs. switching mute gives negligible clicks at the telephone outputs and on the line. dual-tone multi-frequency input dtmf (see note 1.) when the dtmf input is enabled, dialling tones may be sent on to the line. the voltage gain between dtmf-slpe and ln-v ee is typ. 26 db less than the gain of the microphone amplifier and varies with r7 in the same way as the gain of the microphone amplifier. this means that the tone level at the dtmf input has to be adjusted after r exch ( w ) 400 600 800 1000 r6 (k w ) v exch (v) 36 84.5 66.5 x x 48 118 93.1 77.8 66.5 60 x x 97.6 84.5 setting the gain of the microphone amplifier. with r7=68k w the gain is typically 26 db. the signalling tones can be heard in the earpiece at a low level (confidence tone). power-down input pd (see notes 1. and 2.) during pulse dialling or register recall (timed loop break) the telephone line is interrupted; as a consequence it provides no supply for the transmission circuit connected to v cc1 or for the peripherals between v cc2 and slpe. these supply gaps are bridged by the charges in the capacitors c1 and c15. the requirements on these capacitors are eased by applying a high level to the pd input during the time of the loop break. this reduces the internal supply current i cc1 from (typ.) 1.3 ma to (typ.) 60 m a and switches off the voltage regulator to prevent discharge via ln and v cc2 . a high level at pd also internally disconnects the capacitor at reg so that the voltage stabilizer has no switch-on delay after line interruptions. this minimizes the contribution of the ic to the current waveform during pulse dialling or register recall. when the power-down facility is not required, the pd pin can be left open-circuit or connected to slpe. side-tone suppression suppression of the transmitted signal in the earpiece is obtained by the anti-sidetone network comprising r1//z line ,
march 1994 15 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a r2, r3, r8, r9 and z bal (see fig.18). maximum compensation is obtained when the following conditions are fulfilled: a) r9 r2 = r1 (r3 + [r8//z bal ]) b) (z bal /[z bal + r8]) = (z line /[z line + r1]) if fixed values are chosen for r1, r2, r3 and r9, then condition a) is always fulfilled provided r8//z bal << r3. to obtain optimum sidetone suppression, condition b) has to be fulfilled, resulting in: z bal = (r8/r1) z line =k z line where k is a scale factor; k = (r8/r1). the scale factor k (value of r8) is chosen to meet the following criteria: compatibility with a standard capacitor from the e6 or e12 range for z bal ; z bal //r8 << r3 to fulfil condition a) and thus ensure correct anti-sidetone bridge operation; z bal + r8 >> r9 to avoid influencing the transmit gain. in practice z line varies considerably with the line length and line type. therefore the value chosen for z bal should be for an average line length giving satisfactory sidetone suppression with short and long lines. the suppression also depends on the accuracy of the match between z bal and the impedance of the average line. example the line impedance for which optimum suppression is to be obtained can be represented by 210 w+ (1265 w // 140 nf). this represents a 5 km line of 0.5 mm diameter copper twisted-pair cable matched with 600 w (176 w /km; 38 nf/km). with k = 0.64 this results in: r8 = 390 w ; z bal = 130 w+ (820 w // 220 nf). the anti-sidetone network for the tea1060 family shown in fig.18 attenuates the signal received from the line by 32 db before it enters the receiving amplifier. the attenuation is almost constant over the whole audio-frequency range. alternatively a conventional wheatstone bridge can be used as an anti-sidetone circuit (fig.19). both bridge types can be used with either resistive or complex set impedances. (more information on the balancing of anti-sidetone bridges can be obtained in our publication versatile speech transmission ics for electronic telephone sets , order number 9398 341 10011). notes 1. the reference used for the mute, dtmf and pd inputs is slpe. 2. a low level for any of these pins is defined by connection to slpe, a high level is defined as a voltage greater than v slpe + 1.5 v and smaller than v cc1 + 0.4 v.
march 1994 16 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a fig.18 equivalent circuit of tea1060 family anti-side-tone bridge. handbook, full pagewidth mgr073 r1 r2 r9 r3 ir r8 v ee slpe ln z line r t i m z bal fig.19 equivalent circuit of an anti-sidetone network in the wheatstone bridge configuration. handbook, full pagewidth mgr074 r1 r9 ir r8 v ee slpe ln z line r t i m r a z bal
march 1994 17 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a ratings limiting values in accordance with the absolute maximum system (iec 134) notes 1. mostly dependent on the maximum required t amb and on the voltage between ln and slpe. see figs 20 and 21 to determine the current as a function of the required voltage and the temperature. 2. calculated for the maximum ambient temperature specified t amb =75 c and a maximum junction temperature of 125 c. thermal resistance parameter conditions symbol min. max. unit positive line voltage continuous v ln - 12 v repetitive line voltage during switch-on line interruption v ln - 13.2 v repetitive peak line voltage one 1 ms pulse per 5 s r9 = 20 w ; r10 = 13 w (fig.24) v ln - 28 v line current tea1064a (note 1) r9 = 20 w i ln - 140 ma line current TEA1064AT (note 1) r9 = 20 w i ln - 140 ma input voltage on pins other than ln and v cc2 v i v ee - 0.7 v cc1 + 0.7 v total power dissipation (note 2) r9 = 20 w tea1064a p tot - 714 mw TEA1064AT p tot - 555 mw storage temperature range t stg - 40 + 125 c operating ambient temperature range t amb - 25 + 75 c junction temperature t j -+ 125 c from junction to ambient in free air tea1064a r th j-a = 70 k/w TEA1064AT mounted on glass epoxy board 41 19 1.5 mm r th j-a = 90 k/w
march 1994 18 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a fig.20 tea1064a safe operating area. t amb p tot (1) 45 c 1143 mw (2) 55 c 1000 mw (3) 65 c 857 mw (4) 75 c 714 mw handbook, halfpage 212 160 40 80 120 60 100 140 mgr075 46810 v ln -v slpe (v) (2) (3) (4) (1) i ln (ma) fig.21 TEA1064AT safe operating area. t amb p tot (1) 45 c 888 mw (2) 55 c 777 mw (3) 65 c 666 mw (4) 75 c 555 mw handbook, halfpage 212 150 30 70 110 50 90 130 msa546 46810 v ln -v slpe (v) (2) (3) (4) (1) i ln (ma)
march 1994 19 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a characteristics i line = 11 to 140 ma; v ee = 0 v; f = 800 hz; t amb =25 c; r l = 600 w ; tested in the circuit of fig.22 or 23); unless otherwise speci?ed parameter conditions symbol min. typ. max. unit supplies ln, v cc1 , v cc2 (pins 1, 16, 19) reference dc voltage between v cc2 and slpe i line =15ma i p = 0; 4 ma r va not connected v cc2-slpe 3.05 3.3 3.55 v variation with temperature i line =15ma v cc2-slpe / d t - 3.0 - 1.0 1.0 mv/k variation with line current referred to 15 ma i line = 100 ma d v cc2-slpe - 60 - mv with r va connected between reg and slpe r va = 33 k w v cc2-slpe 3.6 3.8 4.2 v r va =20k w v cc2-slpe 3.95 4.2 4.65 v dc line voltage: voltage drop between ln and v ee mic - , mic + inputs open; r15 = 392 w ; without r va at i line =15ma i p = 0 ma v ln 3.4 3.6 4.0 v i p = 2 ma v ln 4.2 4.4 4.8 v i p = 4 ma v ln 4.9 5.1 5.5 v at i line = 100 ma i p = 2 ma v ln - 6.1 7.0 v at i line =140ma ip=2ma v ln - 7.0 7.8 v voltage drop under low current conditions i p =0ma i line = 2 ma v ln - 1.8 - v i line = 4 ma v ln - 2.2 - v i line = 7 ma v ln - 3.2 - v i line =11ma v ln - 3.5 - v internal supply current i cc1 : current into pin v cc1 v cc1 = 2.8 v pd = low i cc1 - 1.3 1.6 ma pd = high i cc1 - 60 82 m a microphone inputs mic - , mic + (pins 8, 9) input impedance: differential z i 51 64 77 k w single-ended z i 25.5 32.0 38.5 k w common mode rejection ratio cmrr - 82 - db
march 1994 20 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a voltage gain (see fig.22) i line = 15 ma; r7=68k w g v 51 52 53 db variation of g v with frequency, referred to 0.8 khz f = 300 and 3400 hz d g v f - 0.5 0.1 + 0.5 db variation of g v with temperature, referred to 25 c without r6; i line = 50 ma; t amb = - 25 to + 75 c d g v t - 0.2 - db dtmf input (pin 12) input impedance z i 16.8 20.7 24.6 k w voltage gain (see fig.22) i line = 15 ma; r7=68k w g v 25 26 27 db variation of g v with frequency, referred to 0.8 khz f = 300 and 3400 hz d g v f - 0.5 0.1 + 0.5 db f = 697 and 1633 hz d g v f - 0.2 0.05 + 0.2 db variation of g v with temperature, referred to 25 ci line = 50 ma; t amb = - 25 to + 75 c d g v t - 0.2 0.5 db gain adjustment inputs gas1, gas2 (pins 2, 3) transmitting ampli?er, gain adjustment range d g v - 8 -+ 0db sending ampli?er output ln (pin 1) dynamic limiter output voltage swing (peak-to-peak value) i line = 15 ma; r7=68k w ; i p = 0 ma; v i(rms) = 3.6 mv v ln(p-p) 3.6 4.0 4.5 v total harmonic distortion v i = 3.6 mv + 10 db thd - 1.5 2.0 % v i = 3.6 mv + 15 db thd - 2.8 10.0 % output voltage swing (peak-to-peak value) v i = 3.6 mv + 10 db i p = 2 ma v ln(p-p) 3.7 3.95 4.2 v i p = 4 ma v ln(p-p) 3.0 3.25 3.5 v i p = 0 ma; i line = 7 ma v ln(p-p) - 2 - v i p = 0 ma; i line = 4 ma v ln(p-p) - 1 - v parameter conditions symbol min. typ. max. unit
march 1994 21 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a dynamic behaviour of limiter c16 = 470 nf attack time, v mic jumps from 2 mv to 40 mv t att - 1.5 5.0 ms release time, v mic jumps from 40 mv to 2 mv t rel 50 150 - ms noise output voltage (rms value) l line =15ma; r7=68k w ; 200 w between mic - and mic + ; psophometrically weighted (p53 curve) v no(rms) -- 72 - dbmp receiving ampli?er input ir (pin 13) input impedance z i 17 21 25 k w receiving ampli?er outputs qr - qr + (pins 4, 5) output impedance single-ended z o - 4 -w voltage gain fig.23; i line = 15 ma; r4 = 100 k w single-ended; r t = 300 w g v 30 31 32 db differential; r t = 600 w g v 36 37 38 db variation with frequency, referred to 0.8 khz f = 300 and 3400 hz d g v f - 0.5 - 0.2 0 db variation with temperature, referred to 25 c without r6; i line = 50 ma; t amb = - 25 to + 75 c d g v t - 0.2 - db output voltage (rms value) thd = 2%; sinewave drive; r4 = 100 k w ; i line =15ma single-ended; r t = 150 w i p = 0 ma v o(rms) - 0.22 - v i p = 2 ma v o(rms) - 0.35 - v differential; r t = 450 w i p = 0 ma v o(rms) - 0.39 - v i p = 2 ma v o(rms) - 0.64 - v differential; c t =47nf; (100 w series resistor); f = 3400 hz i p = 0 ma v o(rms) - 0.57 - v i p = 2 ma v o(rms) - 0.9 - v parameter conditions symbol min. typ. max. unit
march 1994 22 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a output voltage (rms value) i p = 0 ma; thd = 10%; sinewave drive; r4 = 100 k w ; single-ended; r t = 150 w ; i line = 4 ma v o(rms) - 25 - mv i line = 7 ma v o(rms) - 160 - mv noise output voltage (rms value) i line = 15 ma; r 4 = 100 k w ; psophometrically weighted (p53 curve); pin ir open single-ended; r t = 300 w ;v no(rms) - 45 -m v differential; r t = 600 w v no(rms) - 90 -m v noise output voltage (rms value) in circuit of fig.23; s1 in position 2; 200 w between mic + and mic - ; single-ended; r t = 300 w r 7 = 68 k w v no(rms) - 100 -m v r 7 = 24.9 k w v no(rms) - 65 -m v gain adjustment input gar (pin 6) receiving ampli?er, gain adjustment range d g v - 11 -+ 8db mute input (pin 14) input voltage high v ih 1.5 + v slpe - v cc1 + 0.4 v input voltage low v il 0 - 0.3 + v slpe v input current i mute - 11 20 m a change of microphone ampli?er gain at mute-on mute = high -d g v - 100 - db parameter conditions symbol min. typ. max. unit
march 1994 23 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a voltage gain from input dtmf-slpe to qr + output with mute-on mute = high; single-ended load; r l = 300 w g v -- 18 - db power-down input pd (pin 15) input voltage high v ih 1.5 + v slpe - v cc1 + 0.4 v input voltage low v il 0 - 0.3 + v slpe v input current i pd - 510 m a automatic gain control input agc (pin 18) controlling the gain from ir (pin 13) to qr + ,qr - (pins 4, 5) and the gain from mic + , mic - (pins 8, 9) to ln (pin 1) r6 = 93.1 k w (between pins 18 and 11) gain control range with respect to i line =15ma i line =75ma - g v 5.7 6.1 6.5 db highest line current for maximum gain i line - 24 - ma lowest line current for minimum gain i line - 61 - ma change of gain between i line = 15 and 35 ma -d g v 0.9 1.4 1.9 db microphone mute input dls/ mmute (pin 7) input voltage low v il v ee - v ee + 0.3 v input current at low input voltage i il - 85 - 60 - 35 m a release time after a low level on pin 7 c16 = 470 nf t rel - 30 - ms change of microphone ampli?er gain at low input voltage on pin 7 -d g v - 100 - db parameter conditions symbol min. typ. max. unit
march 1994 24 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a fig.22 test circuit for defining voltage gain of mic - , mic + and dtmf inputs; voltage gain (g v ) is defined as 20 log v o / v i . for measuring the gain from mic + and mic - the mute input should be low or open-circuit; for measuring the dtmf input, the mute input should be high. inputs not being tested should be open-circuit. a ndbook, full pagewidth mgr076 v cc1 ln dls/mmute pd mute dtmf mic - mic + ir 620 w tea1064a r4 100 k w r l 600 w i line c4 100 pf c7 1 nf 11 to 140 ma 100 m f 7 c15 220 m f c1 100 m f i p 15 14 12 8 9 13 20 c16 470 nf r7 68 k w c6 100 pf 10 m f 392 w r1 r15 qr - qr + gar gas1 gas2 4 16 v cc2 19 1 5 6 2 3 v i v i v o v ee reg agc stab r9 20 w r6 18 17 11 10 r5 3.6 k w c3 470 nf slpe r16 56 w
march 1994 25 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a application information the basic application circuit is shown in fig.24 and some typical applications are shown in figs 25, 26 and 27. in the basic application, the circuit provides two possibilities for supplies to peripheral circuits: regulated line voltage v ln (stabilized v ln-slpe ) and unregulated supply voltage for peripheral circuits, the supply voltage is dependent only on the peripheral supply current. this application is the same as that used for tea1060/tea1061, tea1067 and tea1068; stabilized supply voltage for peripherals (v cc2-slpe ), the dc line voltage depends on the current flowing to the peripheral circuits. handbook, full pagewidth mgr077 v ee reg agc stab v cc1 ln r9 20 w 820 w 220 nf r6 18 17 11 dls/mmute pd mute dtmf mic - mic + ir s1 620 w tea1064a r4 100 k w r l 600 w z t v o i line c4 100 pf c7 1 nf 11 to 140 ma 100 m f 7 c15 220 m f c1 100 m f i p 15 14 12 8 9 13 100 nf 2 1 10 20 r5 3.6 k w r3 3.92 k w r8 390 w 130 w c3 470 nf c16 470 nf slpe r7 68 k w c6 100 pf 10 m f 130 k w r2 392 w r1 r15 qr - qr + gar gas1 gas2 4 16 v cc2 19 1 5 6 2 3 v i 10 m f r16 56 w fig.23 test circuit for defining voltage gain of the receiving amplifier, voltage gain (g v ) is defined as 20 log v o /v i (with s1 in position 1).
march 1994 26 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a this text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the acrobat reader .this text is here in _ white to force landscape pages to be rotated correctly when browsing through the pdf in the acrobat reader.this text is here in this text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the acrobat reader. white to force land scape pages to be ... pagewidth mgr078 v ee reg gas2 gas1 100 pf agc stab ln v cc1 v cc2 392 w r15 620 w r1 390 w r8 r5 3.6 k w r9 20 w r4 100 k w 17 3 2 20 dls/mmute gar mic - mic + ir tea1064a 8 9 6 5 4 13 18 10 r6 r7 68 k w c16 470 nf slpe c6 11 r17 3.3 k w r16 56 w r14 r13 c5 100 nf z bal c3 470 nf c15 220 m f c1 100 m f - + c4 100 pf c7 1 nf r3 3.92 k w r2 130 k w r10 13 w bas11 (2 ) bzw14 (2 ) telephone line qr - qr + 116 7 dtmf mute pd 12 14 15 from dial and control circuits fig.24 basic application of the tea1064a with stabilized supply for peripherals, shown here with a piezo-electric earpiece and d tmf dialling. the diode bridge and r10 limit the current into, and the voltage across, the circuit during line transients. a different protec tion arrangement is required for pulse dialling or register recall.
march 1994 27 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a for the basic application giving regulated line voltage the above circuit is changed as follows: - r15 must be short-circuited; - the value of r16 is changed to 392 w ; - the value of c3 is changed to 4.7 m f. fig.25 typical dtmf-pulse set application circuit (simplified) showing the tea1064a with the cmos bilingual dialling circuit pcd3310; the broken line indicates optional flash (register recall by timed loop break). handbook, full pagewidth tea1064a telephone line cradle contact bst76a v ee slpe ln v cc2 dtmf mute pd pcd3310 v ss v dd dtmf m fl mgr079 fig.26 typical pulse dial set application circuit (simplified) showing the tea1064a with one of the pcd332x family of cmos interrupted current-loop dialling circuits. handbook, full pagewidth mgr080 tea1064a telephone line cradle contact bst76a v ee slpe ln v cc2 dtmf mute pd pcd332x family v ss v dd m dp dp/flash
march 1994 28 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a fig.27 typical dual-standard (pulse and dtmf) feature phone application circuit (simplified) showing the tea1064a and the pcd3344 cmos telephone microcontroller with on-chip dtmf generator plus i 2 c-bus. handbook, full pagewidth mgr081 tea1064a telephone line cradle contact bst76a v ee slpe ln v cc2 dtmf mute pd pcd3344 pcf8577 v ss v dd tone m dp dp/flash 16-digit lcd lcd module i 2 c-bus
march 1994 29 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a package outlines unit a max. 1 2 b 1 cd e e m h l references outline version european projection issue date iec jedec eiaj mm inches dimensions (inch dimensions are derived from the original mm dimensions) sot146-1 92-11-17 95-05-24 a min. a max. b z max. w m e e 1 1.73 1.30 0.53 0.38 0.36 0.23 26.92 26.54 6.40 6.22 3.60 3.05 0.254 2.54 7.62 8.25 7.80 10.0 8.3 2.0 4.2 0.51 3.2 0.068 0.051 0.021 0.015 0.014 0.009 1.060 1.045 0.25 0.24 0.14 0.12 0.01 0.10 0.30 0.32 0.31 0.39 0.33 0.078 0.17 0.020 0.13 sc603 m h c (e ) 1 m e a l seating plane a 1 w m b 1 e d a 2 z 20 1 11 10 b e pin 1 index 0 5 10 mm scale note 1. plastic or metal protrusions of 0.25 mm maximum per side are not included. (1) (1) (1) dip20: plastic dual in-line package; 20 leads (300 mil) sot146-1
march 1994 30 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a unit a max. a 1 a 2 a 3 b p cd (1) e (1) (1) eh e ll p q z y w v q references outline version european projection issue date iec jedec eiaj mm inches 2.65 0.30 0.10 2.45 2.25 0.49 0.36 0.32 0.23 13.0 12.6 7.6 7.4 1.27 10.65 10.00 1.1 1.0 0.9 0.4 8 0 o o 0.25 0.1 dimensions (inch dimensions are derived from the original mm dimensions) note 1. plastic or metal protrusions of 0.15 mm maximum per side are not included. 1.1 0.4 sot163-1 10 20 w m b p detail x z e 11 1 d y 0.25 075e04 ms-013ac pin 1 index 0.10 0.012 0.004 0.096 0.089 0.019 0.014 0.013 0.009 0.51 0.49 0.30 0.29 0.050 1.4 0.055 0.419 0.394 0.043 0.039 0.035 0.016 0.01 0.25 0.01 0.004 0.043 0.016 0.01 0 5 10 mm scale x q a a 1 a 2 h e l p q e c l v m a (a ) 3 a so20: plastic small outline package; 20 leads; body width 7.5 mm sot163-1 95-01-24 97-05-22
march 1994 31 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a soldering introduction there is no soldering method that is ideal for all ic packages. wave soldering is often preferred when through-hole and surface mounted components are mixed on one printed-circuit board. however, wave soldering is not always suitable for surface mounted ics, or for printed-circuits with high population densities. in these situations reflow soldering is often used. this text gives a very brief insight to a complex technology. a more in-depth account of soldering ics can be found in our data handbook ic26; integrated circuit packages (order code 9398 652 90011). dip s oldering by dipping or by wave the maximum permissible temperature of the solder is 260 c; solder at this temperature must not be in contact with the joint for more than 5 seconds. the total contact time of successive solder waves must not exceed 5 seconds. the device may be mounted up to the seating plane, but the temperature of the plastic body must not exceed the specified maximum storage temperature (t stg max ). if the printed-circuit board has been pre-heated, forced cooling may be necessary immediately after soldering to keep the temperature within the permissible limit. r epairing soldered joints apply a low voltage soldering iron (less than 24 v) to the lead(s) of the package, below the seating plane or not more than 2 mm above it. if the temperature of the soldering iron bit is less than 300 c it may remain in contact for up to 10 seconds. if the bit temperature is between 300 and 400 c, contact may be up to 5 seconds. so r eflow soldering reflow soldering techniques are suitable for all so packages. reflow soldering requires solder paste (a suspension of fine solder particles, flux and binding agent) to be applied to the printed-circuit board by screen printing, stencilling or pressure-syringe dispensing before package placement. several techniques exist for reflowing; for example, thermal conduction by heated belt. dwell times vary between 50 and 300 seconds depending on heating method. typical reflow temperatures range from 215 to 250 c. preheating is necessary to dry the paste and evaporate the binding agent. preheating duration: 45 minutes at 45 c. w ave soldering wave soldering techniques can be used for all so packages if the following conditions are observed: a double-wave (a turbulent wave with high upward pressure followed by a smooth laminar wave) soldering technique should be used. the longitudinal axis of the package footprint must be parallel to the solder flow. the package footprint must incorporate solder thieves at the downstream end. during placement and before soldering, the package must be fixed with a droplet of adhesive. the adhesive can be applied by screen printing, pin transfer or syringe dispensing. the package can be soldered after the adhesive is cured. maximum permissible solder temperature is 260 c, and maximum duration of package immersion in solder is 10 seconds, if cooled to less than 150 c within 6 seconds. typical dwell time is 4 seconds at 250 c. a mildly-activated flux will eliminate the need for removal of corrosive residues in most applications. r epairing soldered joints fix the component by first soldering two diagonally- opposite end leads. use only a low voltage soldering iron (less than 24 v) applied to the flat part of the lead. contact time must be limited to 10 seconds at up to 300 c. when using a dedicated tool, all other leads can be soldered in one operation within 2 to 5 seconds between 270 and 320 c.
march 1994 32 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a definitions life support applications these products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify philips for any damages resulting from such improper use or sale. data sheet status objective speci?cation this data sheet contains target or goal speci?cations for product development. preliminary speci?cation this data sheet contains preliminary data; supplementary data may be published later. product speci?cation this data sheet contains ?nal product speci?cations. limiting values limiting values given are in accordance with the absolute maximum rating system (iec 134). stress above one or more of the limiting values may cause permanent damage to the device. these are stress ratings only and operation of the device at these or at any other conditions above those given in the characteristics sections of the speci?cation is not implied. exposure to limiting values for extended periods may affect device reliability. application information where application information is given, it is advisory and does not form part of the speci?cation.
march 1994 33 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a notes
march 1994 34 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a notes
march 1994 35 philips semiconductors product speci?cation low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting tea1064a notes
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communications, building be-p, p.o. box 218, 5600 md eindhoven, the netherlands, fax. +31 40 27 24825 argentina: see south america australia: 34 waterloo road, north ryde, nsw 2113, tel. +61 2 9805 4455, fax. +61 2 9805 4466 austria: computerstr. 6, a-1101 wien, p.o. box 213, tel. +43 160 1010, fax. +43 160 101 1210 belarus: hotel minsk business center, bld. 3, r. 1211, volodarski str. 6, 220050 minsk, tel. +375 172 200 733, fax. +375 172 200 773 belgium: see the netherlands brazil: see south america bulgaria: philips bulgaria ltd., energoproject, 15th floor, 51 james bourchier blvd., 1407 sofia, tel. +359 2 689 211, fax. +359 2 689 102 canada: philips semiconductors/components, tel. +1 800 234 7381 china/hong kong: 501 hong kong industrial technology centre, 72 tat chee avenue, kowloon tong, hong kong, tel. +852 2319 7888, fax. +852 2319 7700 colombia: see south america czech republic: see austria denmark: prags boulevard 80, pb 1919, dk-2300 copenhagen s, tel. +45 32 88 2636, fax. +45 31 57 0044 finland: sinikalliontie 3, fin-02630 espoo, tel. +358 9 615800, fax. +358 9 61580920 france: 51 rue carnot, bp317, 92156 suresnes cedex, tel. +33 1 40 99 6161, fax. +33 1 40 99 6427 germany: hammerbrookstra?e 69, d-20097 hamburg, tel. +49 40 23 53 60, fax. +49 40 23 536 300 greece: no. 15, 25th march street, gr 17778 tavros/athens, tel. +30 1 4894 339/239, fax. +30 1 4814 240 hungary: see austria india: philips india ltd, band box building, 2nd floor, 254-d, dr. annie besant road, worli, mumbai 400 025, tel. +91 22 493 8541, fax. +91 22 493 0966 indonesia: pt philips development corporation, semiconductors division, gedung philips, jl. buncit raya kav.99-100, jakarta 12510, tel. +62 21 794 0040 ext. 2501, fax. +62 21 794 0080 ireland: newstead, clonskeagh, dublin 14, tel. +353 1 7640 000, fax. +353 1 7640 200 israel: rapac electronics, 7 kehilat saloniki st, po box 18053, tel aviv 61180, tel. +972 3 645 0444, fax. +972 3 649 1007 italy: philips semiconductors, piazza iv novembre 3, 20124 milano, tel. +39 2 6752 2531, fax. +39 2 6752 2557 japan: philips bldg 13-37, kohnan 2-chome, minato-ku, tokyo 108-8507, tel. +81 3 3740 5130, fax. +81 3 3740 5077 korea: philips house, 260-199 itaewon-dong, yongsan-ku, seoul, tel. +82 2 709 1412, fax. +82 2 709 1415 malaysia: no. 76 jalan universiti, 46200 petaling jaya, selangor, tel. +60 3 750 5214, fax. +60 3 757 4880 mexico: 5900 gateway east, suite 200, el paso, texas 79905, tel. +9-5 800 234 7381 printed in the netherlands 415102/00/02/pp36 date of release: march 1994 document order number: 9397 750 nnnnn

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