TEA7091

TEA7091 TELEPHONE ANALOG FRONT END PRODUCT PREVIEW FEATURES: SPEECH DC LINE CURRENT RANGE FROM 6 TO 110mA Tx AND Rx GAIN EXTERNALLY ADJUSTABLE AGC IN Tx AND Rx EXTERNALLY PROGRAMMABLE AGC DISABLEABLE THROUGH MICROCONTROLLER BUS SINGLE/DOUBLE SIDETONE NETWORK SOFTWARE PROGRAMMABLE SOFTCLIPPING ON Tx CHANNEL SQUELCH TO REDUCE Tx NOISE ENVIROMENT AND TO IMPROVE HOWLING IMMUNITY IN LOUDHEARING MODE RECEIVING AMPLIFIER FOR PIEZO OR ELECTRODYNAMIC TRANSDUCERS +6dB MODE ON Rx CHANNEL (SELECTABLE THROUGH MICROCONTROLLER BUS) –6dB MODE ON Tx CHANNEL (SELECTABLE THROUGH MICROCONTROLLER BUS) FREQUENCY GENERATOR FOR WAITING MELODY ERROR BEEP GENERATOR HOLD LINE CURRENT DETECTOR FOR TRANSFER/ AUTO RELEASE GROUP LISTENING / ON-HOOK DIALING ANTI HOWLING WITH ACOUSTIC FEEDBACK SYSTEM COUPLED WITH SQUELCH DIGITAL VOLUME CONTROL (8 STEPS OF 4dB EACH) THROUGH MICROCONTROLLER BUS ANTILARSEN ATTENUATION (4 DIFFERENT LEVELS) PROGRAMMABLE THROUGH MICROCONTROLLER BUS HANDSFREE INTERFACE PIN AND SOFTWARE FACILITY FOR EASY INTERCONNECTION WITH HANDSFREE CONTROLLER IC. RING ON LOUDSPEAKER EMBEDDED SWITCH MODE POWER SUPSeptember 1993 PLCC44 PQFP44 PLY TO FEED THE LOUDSPEAKER AMPLIFIER DURING RING MODE DIGITAL VOLUME CONTROL (8 STEPS OF 4dB EACH) THROUGH MICROCONTROLLER BUS RING FREQUENCY GENERATOR PROGRAMMED THROUGH MICROCONTROLLER BUS DIALLING DTMF GENERATOR (CONTROLLED BY MCU BUS) DC MASK VALUE DURING MAKE PERIOD PROGRAMMABLE THROUGH MICROCONTROLLER BUS MICROCONTROLLER INTERFACE STABILIZED VOLTAGE...