UBA1702A

Speech part
· Driver for the line interrupter that can be either a PMOST when UBA1702 is used or a PNP when UBA1702A is used
· Adjustable over-current protection
· Adjustable over-voltage protection for transmission circuit
· Adjustable mute (dialling mode voltage; DMO or NSA)
· Adjustable current loop detection (hook switch status)
· Microcontroller supply
· Provision for electronic hook switch.
Ringer part
· Over-voltage protection
· Ringer frequency output for frequency discrimination
· Adjustable ringer threshold for piezo-driver enable
· Three bits ringer volume control
· Bridge-tied-load (BTL) output stage for piezo transducer
· Fast start-up microcontroller supply.
Miscellaneous
· Separated ground pins for transmission circuit interface and control signals (e.g. for TEA1064A)
· Possibility to supply the microcontroller with an external voltage source.

The UBA1702; UBA1702A performs the high voltage interface and ringer functions of the corded analog telephone set in close cooperation with a microcontroller and transmission circuit.

The UBA1702; UBA1702A incorporates several protections, a driver for the line interrupter and a ringer.Because of the practical division of functions between the microcontroller, the transmission circuit and the UBA1702;UBA1702A, it is possible to have a higher integration level thereby reducing significantly the number of discrete components in a telephone set.