DESCRIPTION
The device consists of the speech and the dialer. January 1995 DIP28 SO28 ORDERING NUMBERS: L3914AN L3914AD L3924AN L3924AD L3934AN L3934AD PIN CONNECTION (Top view) KEYPAD CONFIGURATION Note: PAUSE/LND: PAUSE and LND functions are sharing the same key with different sequence. Hereafter, PAUSE and LND keys arereferring to the same key. 1/15 This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice. L3914A - L3924A - L3934A BLOCK DIAGRAM When mated with a tone ringer, a complete telephone can be produced with just two ICs. The DC line interface circuit develops its own line voltage across the device and it is adjustable by external resistor to suit different country’s specification. The speech network provides the two to four wires interface, electronic switching between dialing and speech and automatic gain control on transmit and receive. The dialing network buffers up to 32 digits into the LND memory that can be later redialed with a single key input.
STMicroelectronics
