MICROCHIP ZL50233QCG1

The ZL50233 Voice Echo Canceller implements a cost effective solution for telephony voice - band echo cancellation conforming to ITU - T G.168 requirements. The ZL50233 architecture contains 2 groups of two echo cancellers (ECA and ECB) which can be configured to provide two channels of 64 milliseconds or one channel of 128 milliseconds echo cancellation. This provides 4 channels of 64 milliseconds to 2 channels of 128 milliseconds echo cancellation or any combination of the two configurations. The ZL50233 supports ITU - T G.165 and G.164 tone disable requirements.

• Independent multiple channels of echo cancellation; from 4 channels of 64 ms to 2 channels of 128 ms with the ability to mix channels at 128 ms or 64 ms in any combination
• Independent Power Down mode for each group of 2 channels for power management
• Fully compliant to ITU - T G.165, G.168 (2000) and (2002) specifications
• Passed AT&T voice quality testing for carrier grade echo cancellers
• Compatible to ST - BUS and GCI interfaces with 2 Mbps serial PCM data
• PCM coding, μ/μ - Law ITU - T G.711 or sign magnitude
• Per channel Fax/Modem G.164 2100 Hz or G.165 2100 Hz phase reversal Tone Disable
• Per channel echo canceller parameters control
• Transparent data transfer and mute
• Fast reconvergence on echo path changes
• Fully programmable convergence speeds
• Patented Advanced Non - Linear Processor with high quality subjective performance
• Protection against narrow band signal divergence and instability in high echo environments
• +9 dB to - 12 dB level adjusters (3 dB steps) at all signal ports
• Offset nulling of all PCM channels
• 10 MHz or 20 MHz master clock operation
• 3.3 V I/O pads and 1.8 V Logic core operation with 5 V tolerant inputs
• IEEE - 1149.1 (JTAG) Test Access Port

• Voice over IP network gateways
• Voice over ATM, Frame Relay
• T1/E1/J1 multichannel echo cancellation
• Wireless base stations
• Echo Canceller pools
• DCME, satellite and multiplexer system