KA8501A SPEECH NETWORK WITH DIALER INTERFACE INTRODUCTION 16-DIP-300A The KA8501A is a telephone speech network integrated circuit which includes transmit amp, receive amp, DTMF amp, voltage regulator, line equalizer, 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 KA8501A can work in fixed gain mode. FEATURES • Adjusts sending and receiving attenuation length • Regulated voltage for dialer • Linear interface for DTMF • Suitable for ceramic transducers • Mute function ORDERING INFORMATION Device Package Operating Temperature KA8501A 16-DIP-300A - 45°C ~ + 70°C PIN CONFIGURATION MIC1 1 16 MIC2 V+ 2 15 VDD MUTING 3 14 MF BIAS ADJ. 4 13 RXO2 KA8501A REGULATOR 5 12 RXO1 REGULATOR 6 11 RXI + LINE CURRENT 7 10 RXI - ZBAL SWITCH 8 9 Fig. 1 V- KA8501A SPEECH NETWORK WITH DIALER INTERFACE 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 T OPR - 45 ~ + 70 °C Storage Temperature T STG - 65 ~ + 150 °C ELECTRICAL CHARACTERISTICS (Ta = 25°C) Characteristic Line Voltage Common Mode Rejection Ratio Line Matching Impedance T X Gain Symbol VL CMRR ZL GV (TX) T X Gain Flatness ∆ GV (TX) T X Distortion THD TX T X Noise VNO (TX) Side Tone GV (ST) MIC Input Impedance ZI (MIC) T x Loss in MF Operation RX Gain GV (LOSS) GV (RX) Test Conditions Ta = 25°C Typ Max Unit IL = 12mA 3.9 - 4.7 IL = 20mA - - 5.5 IL = 80mA - - 12.2 50 - - dB 500 600 700 Ω f = 1KHz, IL = 12 ~ 80mA VRI = 0.3V, IL = 12 ~ 80mA f = 1KHz Ta = 25°C f = 1KHz VMI = 2mV Min IL = 25mA 48 49 50 IL = 52mA 44 45 46 IL = 25 ~ 52mA 48 49 50 VMI = 2mV, fref = 1KHz - - ±1 IL = 12 ~ 80mA V dB dB f = 1KHz VSO = 1V - - 2 IL = 16 ~ 80mA VSO = 1.3V - - 10 VMI = 0V, IL = 40mA - - -70 dBmp Ta = 25°C, f= 1KHz - - 36 dB KΩ IL = 25 ~ 52mA VMI = 2mV, IL = 12 ~ 80mA VMI = 2mV Ta = 25°C VRI = 0.3V f = 1KHz IL = 25 ~ 52mA 40 - - IL = 25mA - 30 - - IL = 52mA - 30 - - IL = 25mA 7 8 9 IL = 52mA 2.5 3.5 4.5 7 8 9 % dB dB KA8501A SPEECH NETWORK WITH DIALER INTERFACE ELECTRICAL CHARACTERISTICS Characteristic (Continued) Symbol ∆ GV (RX) RX Gain Flatness Test Conditions VRI = 0.3V, fref = 1KHz Min Typ - - IL = 12 ~ 80mA Max ±1 IL = VRO = 1.6V - - 2 f= 12mA VRO = 1.9V - - 10 1KHz IL = VRO = 1.8V - - 2 50mA VRO = 2.1V Unit dB RX Distortion THDRX - - 10 RX Noise VNO (RX) VRI = 0V, IL = 12 ~ 80mA - - 100 µV RX Output Impedance RO (RX) VRO = 50mV, IL = 40mA - - 100 Ω MF Supply Voltage VDD (MF) IL = 12 ~ 80mA 2.4 2.5 - V 0.5 - - 2 - - 15 - 17 MF Supply Current Stand by ISB (MF) Operation IDD (MF) IL = 12 ~ 80mA % mA IL = 12 ~ 80mA MF Amplifier Gain GV (MF) fMF = 1KHz dB VMF = 80mV DC Input Voltage Level (pin 14) VI (MF) VMF = 80mV - 0.3VDD - V Input Impedance (pin 14) ZI (MF) VMF = 80mV 40 - - KΩ VMF = 110mV - - 2 % - - 5 mS - - 1 1.6 - Distortion THD MF Starting Delay Time tD (ST) Muting Threshold Voltage (pin 3) Muting Current IL = 12 ~ 80mA IL = 12 ~ 80mA VTH(MUTE) - Stand by ISB (MUTE) IL = 12 ~ 80mA - - -10 Operation IDD (MUTE) IL = 12 ~ 80mA - - +10 V µA 10 8 4 9 5 6 AGC 7 68 30 11 1uF Tx Amp Output Amp Rx Amp Reg. 15 2 3 Io 14 Mic Amp MF Amp MUTE MF Signal to Dialer 12 13 1 16 1.8K 15V MIC SPEAKER 1.8K 3.6K Tip Ring Fig. 2 330 1K 7.5K 5K 13K 10uF + _ SPEECH NETWORK WITH DIALER INTERFACE KA8501A APPLICATION CIRCUIT