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| 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 KA8501A Package 16-DIP-300A Operating Temperature - 45C ~ + 70C PIN CONFIGURATION MIC1 1 2 3 4 KA8501A 5 6 7 8 16 15 14 13 12 11 10 9 MIC2 V+ VDD MUTING MF BIAS ADJ. RXO2 REGULATOR RXO1 RXI + REGULATOR LINE CURRENT RXI - ZBAL SWITCH V- Fig. 1 KA8501A SPEECH NETWORK WITH DIALER INTERFACE 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 T OPR T STG Value 22 150 -150 1 - 45 ~ + 70 - 65 ~ + 150 Unit V mA mA W C C ELECTRICAL CHARACTERISTICS (Ta = 25C) Characteristic Symbol Test Conditions IL = 12mA Line Voltage Common Mode Rejection Ratio Line Matching Impedance VL CMRR ZL Ta = 25C IL = 20mA IL = 80mA f = 1KHz, IL = 12 ~ 80mA VRI = 0.3V, IL = 12 ~ 80mA f = 1KHz Ta = 25C f = 1KHz VMI = 2mV IL = 25 ~ 52mA T X Gain Flatness T X Distortion T X Noise Side Tone MIC Input Impedance T x Loss in MF Operation GV (TX) THD TX VNO (TX) GV (ST) ZI (MIC) GV (LOSS) VMI = 2mV, fref = 1KHz IL = 12 ~ 80mA f = 1KHz IL = 16 ~ 80mA VMI = 0V, IL = 40mA Ta = 25C, f= 1KHz IL = 25 ~ 52mA VMI = 2mV, IL = 12 ~ 80mA VMI = 2mV Ta = 25C VRI = 0.3V f = 1KHz IL = 25 ~ 52mA IL = 25mA IL = 52mA IL = 25mA IL = 52mA 40 - 30 - 30 7 2.5 7 8 3.5 8 VSO = 1V VSO = 1.3V IL = 25mA IL = 52mA Min 3.9 50 500 48 44 48 Typ 600 49 45 49 Max 4.7 5.5 12.2 700 50 46 50 1 2 10 -70 36 9 4.5 9 dB dB % dBmp dB K dB dB dB V Unit T X Gain GV (TX) RX Gain GV (RX) KA8501A SPEECH NETWORK WITH DIALER INTERFACE (Continued) Test Conditions VRI = 0.3V, fref = 1KHz IL = VRO = 1.6V VRO = 1.9V VRO = 1.8V VRO = 2.1V Min 2.4 0.5 2 15 40 1.6 IL = 12 ~ 80mA IL = 12 ~ 80mA Typ 2.5 0.3VDD -10 +10 Max 1 2 10 2 10 100 100 17 2 5 1 V A dB V K % mS V V mA % Unit dB ELECTRICAL CHARACTERISTICS Characteristic RX Gain Flatness Symbol GV (RX) IL = 12 ~ 80mA f= 1KHz 12mA IL = 50mA RX Distortion THDRX RX Noise RX Output Impedance MF Supply Voltage MF Supply Current Stand by Operation MF Amplifier Gain DC Input Voltage Level (pin 14) Input Impedance (pin 14) Distortion Starting Delay Time Muting Threshold Voltage (pin 3) Stand by Operation VNO (RX) RO (RX) VDD (MF) ISB (MF) IDD (MF) GV (MF) VI (MF) ZI (MF) THD MF tD (ST) VTH(MUTE) ISB (MUTE) IDD (MUTE) VRI = 0V, IL = 12 ~ 80mA VRO = 50mV, IL = 40mA IL = 12 ~ 80mA IL = 12 ~ 80mA IL = 12 ~ 80mA fMF = 1KHz VMF = 80mV VMF = 80mV VMF = 80mV VMF = 110mV IL = 12 ~ 80mA IL = 12 ~ 80mA Muting Current SPEECH NETWORK WITH DIALER INTERFACE 68 1uF 330 6 11 Rx Amp 2 Io 1.8K 12 Output Amp 10 1K AGC 7.5K 13 Tx Amp Mic Amp 15V SPEAKER + 1.8K 8 4 Reg. 1 16 MF Amp Tip 5K 13K 9 10uF 5 7 30 15 to Dialer 3 14 MUTE MF Signal APPLICATION CIRCUIT KA8501A _ Ring 3.6K MIC Fig. 2 |
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