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| MITSUMI IC for Multifunction Telephones LAG639 IC for Multifunction Telephones Monolithic IC LAG639 Outline This IC was developed for use in home-use telephone and small-scale telephone systems, and incorporates data transmission functions (AMI). Features 1. Incorporates efficient switching regulator with broad input voltage range VOUT 5V0.25 IL 250mA (13~45V) VIN 15~45V 2. Internal data transmission/reception circuits Data can be superposed on the power supply line for transmission. AMI format is used for transmission route coding. 3. Internal system reset circuit 5V line abnormal voltage detection circuit Watchdog timer reset circuit 4. Internal speaker amp 260 mW typ. at 8 load Mute pin 5. Internal beep sound generator circuit With pin to vary audio volume (also used to turn beep sound on and off) Package SDIP-30A (LAG639D) Absolute Maximum Ratings Item Operating temperature Storage tempereture Power supply voltage Allowable loss (Ta=25C) Symbol TOPR TSTG VCC max. Pd Ratings -20~+70 -40~+125 46 750 Units C C V mW MITSUMI IC for Multifunction Telephones LAG639 Electrical Characteristics Item SWR unit Output voltage (Except where noted otherwise, Ta=25C, VCC=30V) Measurement circuit Symbol Measurement conditions Min. Typ. Max. Units VO1 VO2 Vr ICCq FOSC IOS VS VS IRON IROFF 1 1 1 1 1 1 2 2 2 2 VCC=15~45V IL=0~250mA VCC=13~45V IL=0~200mA IL=250mA IL=0mA Amp & reception off RS=0.2 4.75 4.70 5.00 5.00 5.25 5.25 50 V V mVP-P mA kHz Output voltage Output ripple voltage Reactive current SWR transmission frequency Output current on short-circuit 6 80 70 4.30 0.2 10 20 110 4.50 10 150 4.80 mA V V mA Power supply voltage detection unit Detection voltage Detection drop voltage Output current while on Leakage output current while off Note: * VS=Vo-VS Vo=4V Vo=5.25V 1 A The asterisk ( ) indicates that the power supply voltage detection unit characteristics are standards in the transient power on/off states. However, for convenience the detection voltage is taken to be the value of V0 when V0 in measurement circuit 2 is varied and the pin 6 output state is switched from off to on. * Electrical Characteristics Item Power amp unit Amp gain Maximum distortion-free output Distortion Attenuation at 100 Hz Attenuation at 10 Hz Input IMP1 Input IMP2 (Except where noted otherwise, Ta=25C, VCC=30V Faudio=1kHz) Measurement circuit 1 1 1 1 1 3 3 Symbol Measurement conditions Min. Typ. Max. Units GV PO max. THD GF1/GF0 GF2/GF0 RIN1 RIN2 Residual noise 1 Vno1 1 Residual noise 2 Vno2 1 Voa=0.775Vrms THD=10% PO=100mW FO=1kHz, Fl=100Hz Voa=0.775Vrms F2=10 kHz, above conditions Mute off Mute on Mute on AUDIO IN 20mVrms IL=10 70mA 1.5kHz Transmission unit ON Ft=1kHz Mute off AUDIO OFF IL=10 70mA 1.5kHz Transmission unit ON Ft=1kHz 35 150 38 260 41 2 dB mV % dB dB k k -14 -8 15 3.5 10 2.5 0.5 mVrms 1.2 mVrms MITSUMI IC for Multifunction Telephones LAG639 Item Beep sound generator unit Beep sound frequency Beep off switching point Beep sound output 1 Beep sound output 2 Watchdog timer unit Timer time Symbol Measurement circuit 1 1 1 1 Measurement conditions Min. Typ. Max. Units Fb Ibsw Vob1 Vob2 Pin 9 input current Pin 9 connected to GND through 4.7k 1.0 Amp output voltage Pin 9 connected to GND through 47k 0.11 cf. watchdog timer waveform diagram cf. watchdog timer waveform diagram T=beep sound period 0.85 20 1.0 35 1.4 0.16 1.15 48 1.8 kHz A Vrms 0.22 Vrms Tt 1 0.8 0.45 (1/2T) 1.0 1.2 1.1 (1T) 0.5 1 S Output pulse width Output voltage while on Leakage output current while off Transmission circuit unit Transmission output voltage Transmission waveform symmetry Reception sensitivity Noise resistance Input IMP Transmission delay time Transmission delay time Transmission delay time Transmission delay time TPW VWON IWOFF Vto Vtr Vrs Vrn RIN3 Td1 Td2 Td3 Td4 1 1 1 1 1 1 1 3 1 1 1 1 1 1 1 1 3 3 3 3 mS V A VP-P VP-P VP-P k S S S S V V VP-P VP-P V V A A Reception output H voltage VroH Reception output L voltage VroL Transmission waveform LOSS 1 Vtloss1 Transmission waveform LOSS 2 Vtloss2 General logic unit characteristics H level input voltage ViH L level input voltage ViL H level input current IiH L level input current IiL 3.8 0.75 1.0 Level at which no errors are output 0.8 Both pins 7and 8 25 cf. transmit/receive waveform diagrams cf. transmit/receive waveform diagrams cf. transmit/receive waveform diagrams cf. transmit/receive waveform diagrams 4 Vt=5V applied, power on Vt=5V applied, power off 4.5 4.5 2.4 VIN=2.4V VIN=0.4V Both pins 27 and 28 Vt1/Vt2 4.2 1 1.2 36 0.5 0.4 1.2 1.5 4.6 1.25 1.5 46 0.5 0.8 10 -300 MITSUMI IC for Multifunction Telephones LAG639 Watchdog timer waveform TIMER CLEAR (23PIN) (22PIN) Interrupt output (20PIN) Tt Tpw Transmission/Reception waveform RESET (25PIN) Transmission DATA IN (24PIN) Transmission waveform (28PIN) Transmission waveform (26PIN) Reception DATA OUT (6PIN) (24PIN) (27PIN) (26PIN) (6PIN) Td3 Td4 Td3 Td4 Td1 Td1 Td2 Td2 Measuring Circuit Measuring Cuicuit 1 MITSUMI IC for Multifunction Telephones LAG639 Measuring Cuicuit 2 Measuring Cuicuit 3 MITSUMI IC for Multifunction Telephones LAG639 Switch Operation (Measurement circuit 1) SW1 SW2 SW3 SW4 SW5 SW6 1 1 1 1 1 1 1 1 1 cf. watchdog timer waveform diagram 1 1 1 1 2 2 SW5-1, 2 measured Measured with Rt adjusted cf. transmit/receive waveform diagrams With power on, SW5-1, 2 measured With power on, SW5-1, 2 measured No spike noise A1 only A2 only THD measured after passing through 400Hz-15kHz BPF Using 400Hz-15kHz BPF Using 400Hz-15kHz BPF Other conditions Measurement item Vo1, Vo2 Vr ICCq IOS GV, PO max., THD GF1/GF0, GF2/GF0 Vno1 Vno2 Fb, IbSW, Vob1, Vob2 Tt, TPW, Vwon IWOFF Vto, Vtr Vrs, Vrn Td, VroH, VroL Vtloss 1 Vtloss 2 * - * * Note: Circles and X's mean the switch display should be on and off respectively; dashes (-) mean either state is allowed. MITSUMI IC for Multifunction Telephones LAG639 Block Diagram and Application Circuits 1. The watchdog timer time is determined by the values of Rw and Cw. Tt . . Rw*Cw where Rw is 56k to 560k = Cw is between 0.01F and 10F 2. The beep sound frequency is determined by Rb and Cb. .. Fb = 1/Rb*Cb where Rb is 56 k to 330k Cb is between 4700PF and 22,000PF. 3. The beep sound volume can be varied through the resistance connected to pin 10. At 4.7k the voltage is approx. 4VP-P, and at 47k it is about 0.4VP-P. 4. In overload protection operation the voltage across pins 1 to 30 is tested, with a limit of 100 20mV. On load shorting, the test voltage is dropped to about 1/4 to conserve power. MITSUMI IC for Multifunction Telephones LAG639 Additional application example 1 (SWR circuit not used) Even when a 5V external voltage can be supplied, an addition voltage of 13 to 45V must be applied to pins 3 and 4 in order to obtain an internal biased power supply of 7.4V. Additional application example 2 (Speaker amp not used) In order to prevent abnormal oscillation of the amplification circuit, a 5V power supply must be connected to pin 15 to halt amplification functions. |
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