ECHO Canceller Single Chip 32-CH G.165/G.168/G.704/G.711 w/o Tone Detection 144-Pin TQFP

The Smart Integrated Digital Echo Canceller (SIDEC) suppresses echoes in telecommunication networks which might disturb any kind of terrestrial or wireless communication. It incorporates leading edge CMOS technology as well as INFINEON’s" many years" experience in Telecommunication ICs. In communication links reflections resulting in an electrical echo are due to hybrid splits or imperfect terminations in subscribe loops. Acoustical echoes may occur due to poor isolation of microphone and speaker of some telephone system. These electrical and acoustical echoes disturb the quality of the transmission. To ensure high quality, pure data transmission the ITU-T (International Telecommunications Union, Telecommunication Standardization Sector) suggests in the recommendation G.131 the use of echo cancellers. Echo cancellation is extremely desirable for data links with total round trip transmission times of more than 50 ms.

• 2.048 MHz PCM input and output interfaces with selectable µ- and A-Law coding according to ITU G.711
• Rapid convergence of patented algorithm at the beginning or during a connection even in the presence of background noise at the near end subscriber
• Echo return loss enhancement of > 30 dB (ERLE)
• Detection of double talk for adaptive convergence control
• Independently controlled voiceband echo cancelling according to ITU G.165 and G.168
• Smart Non Linear Processor controlled by echoloss, echo path delay and background noise
• Various options for comfort noise injection
• Maskable disabling functions
• Integrated Universal Control and Communication Interface (UCCI) for signaling highways with direct hardware control
• Support of Channel Associated Signaling (CAS) BR transparency (robbed bits) in send path
• Selectable µ- to A-Law or A- to µ-Law Conversion on a global or per channel basis
• Configurable idle channel supervision
• Clear channel capability (64 clear) on a per channel basis
• Special evaluation of bit 8 in T1 Modem calls possible (56 clear)
• Serial 256 kbit/s interface to control the functions disable cancelling, freeze coefficients, clear channel, disable NLP, PCM Law conversion control or combinations of above
• Monitor pins for several internal states
• Switchable global loop from receive output to send input and send output to receive input
• Switchable global attenuation (2.5 dB or 6 dB) at the receive and send output
• Flexible Microprocessor Interface (Intel or Motorola type, Mux and Demux mode)
• Advanced Integrated Watchdog Timer
• Supervision of the input clocks
• Various clock modes possible for 32.768 MHz and 8.192 MHz
• Boundary Scan according to IEEE 1149.1 Standard
• Power supply: 3.3 V, 5V tolerant inputs
• Typical power dissipation: 900 mW
• Plastic package P-TQFP 144-8, P-LFBGA 160-2
• Temperature range: -40°C - 85°C and 0°C - 70°C