IC for Multifunction Telephones LAG639 MITSUMI 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 5V±0.25 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 8Ω 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 (Ta=25°C) Item Symbol Ratings Units Operating temperature TOPR -20~+70 °C Storage tempereture TSTG -40~+125 °C Power supply voltage VCC max. 46 V Allowable loss Pd 750 mW IC for Multifunction Telephones LAG639 MITSUMI Electrical Characteristics Item (Except where noted otherwise, Ta=25°C, VCC=30V) Symbol Measurement circuit Measurement conditions Min. Typ. Max. Units SWR unit VCC=15~45V Output voltage VO1 1 Output voltage VO2 1 Output ripple voltage Vr 1 Reactive current ICCq 1 SWR transmission frequency FOSC 1 Output current on short-circuit IOS 1 RS=0.2Ω 70 110 150 mA 2 * 4.30 4.50 4.80 V IL=0~250mA VCC=13~45V IL=0~200mA 4.75 5.00 5.25 V 4.70 5.00 5.25 V 50 mVP-P 10 mA IL=250mA IL=0mA 6 Amp & reception off 80 kHz Power supply voltage detection unit Detection voltage VS Detection drop voltage VS 2 VS=Vo-VS 0.2 Output current while on IRON 2 Vo=4V 10 Leakage output current while off IROFF 2 Vo=5.25V Note: V 20 mA 1 µA 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 (Except where noted otherwise, Ta=25°C, VCC=30V Faudio=1kHz) Item Symbol Measurement circuit Power amp unit Amp gain Maximum distortion-free output Distortion GV PO max. THD 1 1 1 Attenuation at 100 Hz GF1/GF0 1 Attenuation at 10 Hz Input IMP1 Input IMP2 GF2/GF0 RIN1 RIN2 1 3 3 Residual noise 1 Vno1 1 Residual noise 2 Vno2 1 Measurement conditions 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 Min. Typ. Max. Units 35 150 38 260 41 2 10 2.5 dB mV % -14 dB -8 15 3.5 dB kΩ kΩ 0.5 mVrms 1.2 mVrms IC for Multifunction Telephones LAG639 MITSUMI Item Symbol Measurement circuit Beep sound generator unit Beep sound frequency Beep off switching point Fb Ibsw 1 1 Beep sound output 1 Vob1 1 Beep sound output 2 Watchdog timer unit Vob2 1 Timer time Tt 1 Output pulse width TPW 1 Output voltage while on Leakage output current while off Transmission circuit unit Transmission output voltage Transmission waveform symmetry Reception sensitivity Noise resistance Input IMP VWON IWOFF 1 1 Vto Vtr Vrs Vrn RIN3 1 1 1 1 3 Transmission delay time Td1 1 Transmission delay time Td2 1 Transmission delay time Td3 1 Transmission delay time Td4 1 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 1 1 1 1 3 3 3 3 Measurement conditions Min. Typ. Max. Units 0.85 20 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 0.8 1.0 35 1.15 48 kHz µA 1.4 1.8 Vrms 0.16 0.22 Vrms 1.0 1.2 S 1.1 (1T) mS 0.5 1 V µA 4.2 1 1.2 4.6 1.25 1.5 VP-P 36 46 0.45 (1/2T) Both pins 27 and 28 Vt1/Vt2 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 0.5 µS 0.4 µS 1.2 µS 1.5 µS 0.5 Vt=5V applied, power on Vt=5V applied, power off 4.5 4.5 2.4 VIN=2.4V VIN=0.4V VP-P VP-P kΩ 0.8 10 -300 V V VP-P VP-P V V µA µA IC for Multifunction Telephones LAG639 MITSUMI 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) Td1 Td2 Td3 Td4 Td1 Td2 Td3 Td4 (6PIN) Measuring Circuit Measuring Cuicuit 1 MITSUMI Measuring Cuicuit 2 Measuring Cuicuit 3 IC for Multifunction Telephones LAG639 IC for Multifunction Telephones LAG639 MITSUMI Switch Operation (Measurement circuit 1) Measurement item SW1 SW2 SW5 SW6 Vo1, Vo2 - 1 Vr - 1 No spike noise ICCq - 1 A1 only IOS - 1 A2 only - 1 Vno1 - 1 Using 400Hz-15kHz BPF Vno2 - 1 Using 400Hz-15kHz BPF Fb, IbSW, Vob1, Vob2 - 1 - 1 GV, PO max., THD GF1/GF0, GF2/GF0 - - SW3 SW4 Other conditions THD measured after passing Tt, TPW, Vwon through 400Hz-15kHz BPF cf. watchdog timer waveform diagram - 1 Vto, Vtr * 1 SW5-1, 2 measured Vrs, Vrn - 1 Measured with Rt adjusted Td, VroH, VroL - 1 Vtloss 1 * * 2 With power on, SW5-1, 2 measured 2 With power on, SW5-1, 2 measured IWOFF Vtloss 2 - - cf. transmit/receive waveform diagrams 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 56kΩ to 560kΩ Cw is between 0.01µF and 10µF 2. The beep sound frequency is determined by Rb and Cb. . . 1/Rb•Cb where Rb is 56 kΩ to 330kΩ Fb = Cb is between 4700PF and 22,000PF. 3. The beep sound volume can be varied through the resistance connected to pin 10. At 4.7kΩ the voltage is approx. 4VP-P, and at 47kΩ 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.