AT2004 Datasheet | Atelic Systems

Description The AT2004 is a four full-duplex channels, ADPCM processor with conferencing and echo cancellation capabilities. It follows the G.726 ITU Standard for ADPCM pression for 40k, 32k, 24k and 16k bitrates with selectable µ-law and Alaw input/output. It conforms to ITU G.165/G.168 Digital Adaptive Echo Canceller specification for line echo delay up to 20ms. Using the mand serial interface, each individual half-channel can be independently configured for ADPCM, conferencing and echo canceling features . Features - - - - - - - - - 4 full channels of ITU G.726 ADPCM 4 full channels of ITU G.165/G.168 plia nt echo cancellation with up to 20ms echo delay Fast and robust convergence for adaptive echo canceller, even in the presence of background noise Nonlinear processing with adaptive suppression threshold and fort noise generation for echo canceller Per channel selectable µ-Law and A-law input/output On-chip time slot assignment Available internal clock generator and frame sync. generator Simple 3-wire serial mand port for chip configuration Conferencing capabilities for up to 3 additional sound sources Applications - - - - DECT Vo IP / Vo DSL Wireless telephone systems Wireless PBX systems Default Settings - - - - - - 4 channels of µ-law PCM input on Xin in time slot 0, 1, 2, 3 4 channels of the corresponding ADPCM output at 32kbps on Xout in time slot 0, 1, 2, 3 4 channels of ADPCM input at 32kbps on Yin in time slot 0, 1, 2, 3 4 channels of corresponding PCM µ-law output on Yout in time slot 0, 1, 2, 3 Echo cancellation enabled for four channels Conferencing disabled Note: To change the default settings, mands could be sent through the 3-wire interface. Page 1 of 25 ©2001 Atelic System, Inc AT2004 4 Channels ADPCM Processor with Echo Cancellation and Conferencing PIN Description PIN 16 20 27 25 SYMBOL XIN XOUT YIN FSY TYPE I O I I/O DESCRIPTION X Channel Data In . Sampled on the falling edge of CLKP during selected time slots with MSB first. X Channel...