KA8504 Datasheet | Samsung Semiconductor

FEATURES - Low line current operation - Mute function - DTMF signal interface - Easy gain control ORDERING INFORMATION Device KA8504 Package 16-DIP-300A Operating Temperature - 40°C ~ + 85°C BLOCK DIAGRAM ROF 14 RXI 13 RX INPUT AMP RX GAIN CONTROL RX OUTPUT AMP GC 12 GAIN CONTROLLER 10 VL 1 TX AMP MIC+ TX GAIN CONTROL TX AMP MIC- 2 CI 3 CO 6 MUTE 9 TOF Fig. 1 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 bee active. Mute input. When this pin is 'H’level, speech circuit is muted and the DTMF input is enabled. The voltage of this part bees 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...