S1T8501

SPEECH NETWORK WITH DIALER INTERFACE S1T8501 INTRODUCTION 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. 16−DIP−300A 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 −45°C — + 70 °C 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 = 70°C) 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 = 25°C) Characteristic Symbol Ta = 25°C Test Conditions IL = 12mA Min. 3.9 Typ. − − − − 600 49 45 49 Max. 4.7 5.5 12.2 Unit Lin...