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| KA8504 SPEECH NETWORK WITH DIALER INTERFACE INTRODUCTION 16-DIP-300A The KA8504 is a telephone speech network which includes TX Amp, RX Amp and DTMF Amp. The gain is controlled automatically by sensing the line current. The circuit internally performs electronic switching between dialing and speech by mute signal. FEATURES * Low line current operation * Mute function * DTMF signal interface * Easy gain control ORDERING INFORMATION Device KA8504 Package 16-DIP-300A Operating Temperature - 40C ~ + 85C BLOCK DIAGRAM ROF 14 RXI 13 RX INPUT AMP RX GAIN CONTROL RX OUTPUT AMP 15 RXO GC 12 GAIN CONTROLLER 5 MF 10 VL 1 TX AMP MIC+ TX GAIN CONTROL TX AMP 11 MIC- 2 CI 3 CO 6 MUTE 9 TOF Fig. 1 KA8504 SPEECH NETWORK WITH DIALER INTERFACE PIN CONFIGURATION VL CI CO BIAS MF MUTE VR GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 Vcc RXO ROF RXI GC MICMIC+ TOF Fig. 2 PIN DESCRIPTION Pin No 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Symbol VL CI CO BIAS MF MUTE VR GND TOF MIC + MIC GC RXI ROF RXO VCC Description Positive power line and TX Amp Output. Current input. Current output. If the line current is large, this pin dissipates excess power (current) AC signal reference voltage terminal. DTMF input. When the mute pin is "H" level, this pin become active. Mute input. When this pin is 'H'level, speech circuit is muted and the DTMF input is enabled. The voltage of this part becomes reference voltage of internal Amp. Negative power line. Output of the Mic Amp. Negative feedback to MIC -. Non inverting Mic input. Inverting Mic input. Gain triggering point regulation. Receiver input. RX out and negative feedback to RX input. Receiver Amp out. Internal power supply pin. Power is supplied from VL through resistor. KA8504 SPEECH NETWORK WITH DIALER INTERFACE ABSOLUTE MAXIMUM RATINGS Characteristic Line Voltage Line Current Surge Line Current (2 sec) Power Dissipation Operating Temperature Storage Temperature Symbol VL IL IL (SURGE) PD T OPR T STG Value 15 150 200 1.0 - 40 ~ 85 - 55 ~ 150 Unit V mA mA W C C ELECTRICAL CHARACTERISTICS (Ta = 25C, f = 1KHz, unless otherwise noted) Characteristic Symbol Test Conditions IL = 20mA Line Voltage VL IL = 50mA IL = 120mA IL = 20mA Internal Operating Voltage VCC IL = 50mA IL = 120mA T X Gain GV (TX) IL = 20mA IL = 120mA IL = 20mA T X Dynamic Output Voltage VO (TX) THD = 4.0% IL = 120mA THD = 4.0% RX Gain GV (RX) IL = 20mA IL = 120mA IL = 20mA RX Dynamic Output Voltage VO (RX) THD = 10% IL = 120mA THD = 10% RX Output Current DTMF Gain DTMF Input Impedance Mute Pin High Voltage IO (RX) GV (MF) ZI (MF) VIH (MUTE) IL = 20 ~ 120mA IL = 20mA IL = 120mA IL = 50mA IL = 20 ~ 120mA Min 3.1 5.4 10.5 1.7 3.3 7.2 35.0 32.0 2.5 4.0 -7.5 -13.5 250 300 4.0 20.5 17.5 24 1.5 Typ 3.5 6.0 11.5 2.0 3.7 7.6 37.0 34.0 -4.5 -1.5 22.5 19.5 Max 3.9 6.4 12.5 2.3 4.1 8.0 39.0 36.0 Vp-p -1.5 -7.5 mVp-p 24.5 21.5 VCC K V mA dB dB V V Unit dB KA8504 620 1500pF 330 2.2K 100K 22K 1.5K APPLICATION CIRCUIT 11 6.2K 1 43 2 5 334 150 11K 103 6 8 15 3 + 10 100K 7 9 16 14 13 KA8504 TIP - SPEECH NETWORK WITH DIALER INTERFACE Fig.3 + 104 20K 1F SWm 1.4V + 22F 104 VM 22F 330 VMF 15 + + SPEAKER (IMPEDANCE = 150 ) RING 220F |
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