Title :
A 5V CMOS Programmable Acoustic Front-End for ISDN Terminals and Digital Telephone Sets
Author :
Nicollini, Germano ; Confalonieri, Pierangelo ; Crippa, Carlo ; Pernici, Sergio ; Dallavalle, Carlo ; Mazoyer, Yves
Author_Institution :
SGS-THOMSON Microelectron., Milan, Italy
Abstract :
A 5V programmable acoustic front-end IC for ISDN terminal and digital telephone set applications is presented. The chip performs PCM codec and filler functions fulfilling and exceeding all D3/D4 and CCITT specs. It implements the analog interfaces required for the speech (low noise microphone preamplifier, earpiece and loudspeaker drivers, sidetone, antilarsen control) and tone/ring/DTMF generation without external components. The device can be controlled by a microprocessor or a HDLC controller via a separate four wire control interface or by means of a serial control channel multiplexed with the PCM voice/data in a GCI compatible format. Chip area is 30 mm2 in a 1.5μ CMOS technology. Active/stand by power consumption is 60mW/0.2mW from a single 5V supply.
Keywords :
CMOS integrated circuits; ISDN; acoustic devices; codecs; microprocessor chips; programmable filters; telecommunication terminals; telephone sets; CCITT spec; CMOS programmable acoustic front-end IC; D3-D4 spec; GCI compatible format; HDLC controller; ISDN terminal; PCM codec; PCM voice-data; digital telephone set; filter function; four wire control interface; microprocessor; power 0.2 mW; power 60 mW; serial control channel; tone-ring-DTMF generation; voltage 5 V; Acoustic applications; Application specific integrated circuits; CMOS technology; Codecs; Digital integrated circuits; Filters; ISDN; Phase change materials; Telephone sets; Telephony;
Conference_Titel :
Solid-State Circuits Conference, 1992. ESSCIRC '92. Eighteenth European
Conference_Location :
Copenhagen
Print_ISBN :
87-984232-0-7
DOI :
10.1109/ESSCIRC.1992.5468221
