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| SPEECH NETWORK WITH DIALER INTERFACE S1T8501 INTRODUCTION 16-DIP-300A The S1T8501 is a speech network integrated circuit which includes the following components: transmit amp, receive amp, DTMF amp, voltage regulator, line equalizer, and voltage comparator. It handles the voice signal, performing the 2/4 wires interface and changing the gain on both sending and receiving amplifiers to compensate the line current. The S1T8501 can work in fixed gain mode. FEATURES * * * * * Adjusts sending and receiving attenuation length Regulated voltage output for external dialer Linear interface for DTMF Suitable for ceramic transducers Mute function ORDERING INFORMATION Device S1T8501X01-D0B0 Package 16-DIP-300A Operating Temperature -45C -- + 70C 1 S1T85011 SPEECH NETWORK WITH DIALER INTERFACE PIN CONFIGURATION MIC1 1 2 3 4 S1T8501 5 6 7 8 16 15 14 13 12 11 10 9 MIC2 V+ VDD MUTING MF BIAS ADJ. RXO2 REGULATOR BYPASS REGULATOR RXO1 RXI + LINE CURRENT SENSING ZBAL SWITCH RXI - V- ABSOLUTE MAXIMUM RATINGS Characteristic Line Voltage (3msec max) Forward Line Current Reverse Line Current Power Dissipation (Ta = 70C) Operating Temperature Storage Temperature Symbol VL ILF ILR PD TOPR TSTG Value 22 150 -150 1 - 45 -- + 70 - 65 -- + 150 Unit V mA mA W C C 2 SPEECH NETWORK WITH DIALER INTERFACE S1T8501 ELECTRICAL CHARACTERISTICS (TA = 25C) Characteristic Symbol Test Conditions IL = 12mA Line Voltage VL Ta = 25C IL = 20mA IL = 80mA Common Mode Rejection Ratio Line Matching Impedance CMRR ZL f = 1kHz, IL = 12 to 80mA VRI = 0.3V, IL = 12 to 80mA f = 1kHz Ta = 25C f = 1kHz VMI = 2mV IL = 25mA IL = 52mA Min. 3.9 Typ. - - - - 600 49 45 49 Max. 4.7 5.5 12.2 Unit - - 50 500 48 44 48 V - 700 50 46 50 1 2 dB TX Gain GV (TX) dB IL = 25 to 52mA TX Gain Flatness TX Distortion TX Noise Side Tone MIC Input Impedance Tx Loss in MF Operation GV (TX) THD TX VNO (TX) GV (ST) ZI (MIC) GV (LOSS) VMI = 2mV, fref = 1kHz, IL = 12 to 80mA f = 1kHz IL = 16 to 80mA VSO = 1V VSO = 1.3V - - - - - 40 - - - - - - - - 8 3.5 8 dB % 10 VMI = 0V, IL = 40mA Ta = 25C, f= 1kHz, IL = 25 to 52mA VMI = 2mV, IL = 12 to 80mA VMI =2mV Ta = 25C VRI = 0.3V f = 1kHz IL = 25mA IL = 52mA IL = 25mA IL = 52mA -70 36 dBm dB k dB - - - 9 4.5 9 1 2 10 -30 -30 7 2.5 7 RX Gain GV (RX) dB IL = 25 to 52mA RX Gain Flatness GV (RX) VRI = 0.3V, fref = 1kHz, IL = 12 to 80mA IL = 12mA RX Distortion THDRX f =1kHz IL = 50mA RX Noise RX Output Impedance MF Supply Voltage Standby MF Supply Current Operation MF Amplifier Gain DC Input Voltage Level (pin 14) Input Impedance (pin 14) Distortion VNO (RX) RO (RX) VDD (MF) ISB (MF) IDD (MF) GV (MF) VI (MF) ZI (MF) THD MF VRI = 0V, IL = 12 to 80mA VRO = 50mV, IL = 40mA IL = 12 to 80mA IL = 12 to 80mA IL = 12 to 80mA fMF = 1kHz,VMF = 80mV VMF = 80mV VMF = 80mV VMF = 110mV, IL = 12 to 80mA VRO = 1.6V VRO = 1.9V VRO = 1.8V VRO = 2.1V - - - - - - - 2.4 0.5 2 15 - - - - - - - 2.5 dB % 2 10 100 100 V V mA dB V k % - - - 17 - - - 0.3VDD - 40 - - 2 - - - 3 S1T85011 SPEECH NETWORK WITH DIALER INTERFACE ELECTRICAL CHARACTERISTICS (TA = 25C) (Continued) Characteristic Starting Delay Time Muting Threshold Voltage (pin 3) Standby Muting Current Operation Symbol tD (ST) VTH(MUTE) ISB (MUTE) IDD (MUTE) Test Conditions IL = 12 to 80mA Min. - - 1.6 Typ. - - - - - Max. 5 1 Unit mS V - - 10 + 10 IL = 12 to 80mA IL = 12 to 80mA - - A 4 SPEECH NETWORK WITH DIALER INTERFACE S1T8501 APPLICATION CIRCUIT 68 330 1uF 6 11 Rx Amp 2 Io 12 13 Mic Amp 1.8K 15V SPEAKER 10 1K AGC 7.5K Output Amp Tx Amp 8 4 Reg. + 1.8K 1 16 MF Amp Tip 5K 13K 9 10uF 5 7 30 15 to Dialer 3 14 MUTE MF Signal _ Ring 3.6K MIC 5 S1T85011 SPEECH NETWORK WITH DIALER INTERFACE NOTES 6 |
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