Title :
A 5-V CMOS programmable acoustic front-end for ISDN terminals and digital telephone sets
Author :
Nicollini, G. ; Confalonieri, P. ; Crippa, C. ; Pernici, S. ; Mazoyer, Y. ; Dallavalle, C. ; Mariani, S. ; Calloni, A.
Author_Institution :
SGS-Thomson Microelectron., Milan, Italy
fDate :
9/1/1994 12:00:00 AM
Abstract :
A 5-V CMOS programmable acoustic front-end IC for ISDN terminal and digital telephone set applications is presented. The chip performs PCM codec and filter functions, fulfilling all D3/D4 and CCITT specs. Moreover, it implements the main analog interfaces required for the speech channel (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 four wire separated control interface or by means of a serial control channel multiplexed with the PCM voice/data channel in a GCI compatible format. Chip area is 30 mm 2 in a 1.5-μm CMOS technology. The active/stand-by power consumption is 60 mW/0.2 mW from a single 5-V supply. All circuits are designed to meet performance objectives over a voltage range from 4.5 V to 5.5 V and a temperature range from -40°C up to 85°C
Keywords :
CMOS integrated circuits; ISDN; codecs; digital communication systems; preamplifiers; pulse-code modulation; switched capacitor filters; telephone sets; -40 to 85 C; 0.2 mW; 1.5 micron; 4.5 to 5.5 V; 5 V; 60 mW; CCITT specs; CMOS technology; D3/D4 specs; GCI compatible format; ISDN terminals; PCM codec functions; PCM filter functions; analog interfaces; antilarsen control; control interface; digital telephone sets; earpiece driver; loudspeaker driver; low-noise microphone preamplifier; programmable acoustic front-end; serial control channel; sidetone control; single 5-V supply; speech channel; tone/ring/DTMF generation; Acoustic applications; Application specific integrated circuits; CMOS digital integrated circuits; CMOS integrated circuits; CMOS technology; Codecs; Filters; ISDN; Phase change materials; Telephony;
Journal_Title :
Solid-State Circuits, IEEE Journal of
