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 Package Operating Temperature S1T8501X01-D0B0 16−DIP−300A −45°C — + 70°C 1 S1T85011 SPEECH NETWORK WITH DIALER INTERFACE PIN CONFIGURATION MIC1 1 16 MIC2 V+ 2 15 VDD MUTING 3 14 MF BIAS ADJ. 4 13 RXO2 S1T8501 REGULATOR BYPASS 5 12 RXO1 REGULATOR 6 11 RXI + LINE CURRENT SENSING 7 10 RXI − ZBAL SWITCH 8 9 V− ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Value Unit Line Voltage (3msec max) VL 22 V Forward Line Current ILF 150 mA Reverse Line Current ILR −150 mA Power Dissipation (Ta = 70°C) PD 1 W Operating Temperature TOPR − 45 — + 70 °C Storage Temperature TSTG − 65 — + 150 °C 2 SPEECH NETWORK WITH DIALER INTERFACE S1T8501 ELECTRICAL CHARACTERISTICS (TA = 25°C) Characteristic Line Voltage Symbol VL Test Conditions Ta = 25°C Min. Typ. Max. IL = 12mA 3.9 − 4.7 IL = 20mA − − 5.5 IL = 80mA − − 12.2 Unit V Common Mode Rejection Ratio CMRR f = 1kHz, IL = 12 to 80mA 50 − − dB Line Matching Impedance ZL VRI = 0.3V, IL = 12 to 80mA f = 1kHz 500 600 700 Ω IL = 25mA 48 49 50 GV (TX) Ta = 25°C f = 1kHz VMI = 2mV IL = 52mA 44 45 46 IL = 25 to 52mA 48 49 50 TX Gain dB TX Gain Flatness ∆ GV (TX) VMI = 2mV, fref = 1kHz, IL = 12 to 80mA − − ±1 − − 2 THD TX f = 1kHz IL = 16 to 80mA VSO = 1V TX Distortion VSO = 1.3V − − 10 TX Noise VNO (TX) VMI = 0V, IL = 40mA − − −70 dBm Side Tone GV (ST) Ta = 25°C, f= 1kHz, IL = 25 to 52mA − − 36 dB MIC Input Impedance ZI (MIC) VMI = 2mV, IL = 12 to 80mA 40 − − kΩ Tx Loss in MF Operation GV (LOSS) VMI =2mV IL = 25mA −30 − − IL = 52mA −30 − − IL = 25mA 7 8 9 GV (RX) Ta = 25°C VRI = 0.3V f = 1kHz IL = 52mA 2.5 3.5 4.5 IL = 25 to 52mA 7 8 9 VRI = 0.3V, fref = 1kHz, IL = 12 to 80mA − − ±1 VRO = 1.6V − − 2 VRO = 1.9V − − 10 VRO = 1.8V − − 2 VRO = 2.1V − − 10 RX Gain ∆GV (RX) RX Gain Flatness IL = 12mA RX Distortion THDRX f =1kHz IL = 50mA dB % dB dB dB % RX Noise VNO (RX) VRI = 0V, IL = 12 to 80mA − − 100 µV RX Output Impedance RO (RX) VRO = 50mV, IL = 40mA − − 100 Ω MF Supply Voltage VDD (MF) IL = 12 to 80mA 2.4 2.5 − V 0.5 − − 2 − − Standby MF Supply Current Operation ISB (MF) IDD (MF) IL = 12 to 80mA mA MF Amplifier Gain GV (MF) IL = 12 to 80mA fMF = 1kHz,VMF = 80mV 15 − 17 dB DC Input Voltage Level (pin 14) VI (MF) VMF = 80mV − 0.3VDD − V Input Impedance (pin 14) ZI (MF) VMF = 80mV 40 − − kΩ Distortion THD MF VMF = 110mV, IL = 12 to 80mA − − 2 % 3 S1T85011 SPEECH NETWORK WITH DIALER INTERFACE ELECTRICAL CHARACTERISTICS (TA = 25°C) (Continued) Characteristic Symbol Starting Delay Time tD (ST) Muting Threshold Voltage (pin 3) VTH(MUTE) IL = 12 to 80mA Min. Typ. Max. Unit − − 5 mS − − 1 1.6 − − Standby ISB (MUTE) IL = 12 to 80mA − − − 10 Operation IDD (MUTE) IL = 12 to 80mA − − + 10 Muting Current 4 Test Conditions V µA SPEECH NETWORK WITH DIALER INTERFACE S1T8501 APPLICATION CIRCUIT 68 6 11 2 Io Rx Amp 10 1.8K 1.8K Output Amp 1K 15V 13 SPEAKER Tx Amp AGC Mic Amp 8 Tip 1 3.6K 4 16 Reg. MF Amp MIC _ 7.5K 12 + 330 1uF Ring 5K 13K 9 5 7 15 3 14 MUTE MF Signal 10uF 30 to Dialer 5 S1T85011 SPEECH NETWORK WITH DIALER INTERFACE NOTES 6