ZL38070 Datasheet, PDF (2/51 Pages) Zarlink Semiconductor Inc – 256 Channel Voice Echo Canceller

ZL38070
Data Sheet
Description
The ZL38070 Voice Echo Canceller implements a cost effective solution for telephony voice-band echo cancellation
conforming to ITU-T G.168 requirements. The ZL38070 architecture contains 128 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 256 channels of 64 milliseconds to 128 channels of
128 milliseconds echo cancellation or any combination of the two configurations. The ZL38070 supports ITU-T
G.165 and G.164 tone disable requirements.
Rin
Sin
MCLK
Fsel
C4i
F0i
V_{DD1 (3.3V)}
V_SS
V_{DD2 (1.8V)}
ODE
Serial
to
Parallel
PLL
Timing
Unit
Echo Canceller Pool
Group 0 Group 1 Group 2 Group 3
ECA/ECB ECA/ECB ECA/ECB ECA/ECB
Group 4 Group 5 Group 6 Group 7
ECA/ECB ECA/ECB ECA/ECB ECA/ECB
Group 8 Group 9 Group 10 Group 11
ECA/ECB ECA/ECB ECA/ECB ECA/ECB
Group 12 Group 13 Group 14 Group 15
ECA/ECB ECA/ECB ECA/ECB ECA/ECB
Parallel
to
Serial
Note:
Refer to Figure 4
for EVP block
diagram
Microprocessor Interface
Test Port
DS CS R/W A12-A0 DTA D7-D0 IRQ TMS TDI TDO TCK TRST
Figure 2 - Single Echo Voice Processor (EVP) Overview
Rout
Sout
IC0
RESET
2
Zarlink Semiconductor Inc.