L3234 Datasheet | STMicroelectronics

DESCRIPTION The L3234/L3235 is a highly integrated SLIC KIT targeted to PABX and key system applications The kit integrates the majority of functions required to interface a telephone line. The L3234/L3235 implements the main features of the broths function: - Battery Feed (Balanced Mode) - Ringing Injection - Signalling Detection - Hybrid Function The Kit prises 2 devices, the L3234 ringing injector fabricated in Bipolar in 140V Technology. Its function is to amplify and inject in balanced mode with zero crossing the ringing signal. The device requires an external positive supply of 100V and a low level sinusoid of approx. 950m Vrms. The L3235 Line Feeder is integrated in 60V Bipolar Technology. The L3235 provides battery feed to the line with programmable current limitation. The two to four wire voice frequency signal conversion is implemented by the L3235 and line terminating and balance impedances are externally programmable. The L3234/L3235 kit is designed for low power dissipation. In a short loop condition the extra power is dissipated on an external transistor. The Kit is controlled by five wire parallel bus and interfaces easily to all first and programmable second generation BOS. (see figg. 1 and 2) Janauary 1995 1/26 This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice. - L3235 Figure 1: Typical Application Circuit with Second Generation BO for plete Subscriber Circuit (Protection-SLIC-BO) 2/26 - L3235 Figure 2: Typical Application Circuit with First Generation BO for plete Subscriber Circuit (Protection-SLIC-BO) 3/26 - L3235 L3234 Solid State Ringing Injector DESCRIPTION The L3234 is a monolithic integrated circuit which is part of a kit of solid state devices for the subscriber line interface. The L3234 sends a ringing signal into a two wires analog telephone line in balanced mode. The AC ringing signal amplitude is up to 60Vrms, and for that...