ZL50232

• Independent multiple channels of echo cancellation; from 32 channels of 64 ms to 16 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 all AT&T voice quality tests for carrier grade echo canceller.
• Compatible to ST-BUS and GCI interface at 2 Mbps serial PCM
• PCM coding, /A-Law ITU-T G.711 or sign magnitude
• Per channel Fax/Modem G.164 2100Hz or G.165 2100Hz 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 Proces sor with high quality subjective performance
• Protection against narrow band signal divergence and instability in high echo enironments
• +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 pads and 1.8 V Logic core operation with 5 V tolerant inputs
• IEEE-1149.1 (JTAG) Test Access Port

The ZL50232 Voice Echo Canceller implements a cost effective solution for telephony voice-band echo cancellation Aconforming to ITU-T G.168 requirements. The ZL50232 architecture contains 16 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 32 channels of 64 milliseconds to 16 channels of 128 milliseconds echo cancellation or any combination of the two configurations. The ZL50232 supports ITU-T G.165 and G.164 tone disable requirements