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参数资料
| 型号： | ZL50233/GDG |
| 厂商： | ZARLINK SEMICONDUCTOR INC |
| 元件分类： | 数字传输电路 |
| 英文描述： | DATACOM, ISDN ECHO CANCELLER, PBGA208 |
| 封装： | 17 X 17 MM, 1.30 MM HEIGHT, MO-192, LBGA-208 |
| 文件页数： | 5/38页 |
| 文件大小： | 547K |
| 代理商： | ZL50233/GDG |
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ZL50233
Data Sheet
13
Zarlink Semiconductor Inc.
Back-to-Back configuration is selected by writing a “1” into the BBM bit of Control Register 1 for both Echo
Canceller A and Echo Canceller B for a given group of echo canceller. Table 4 shows the 2 groups of 2 cancellers
that can be configured into Back-to-Back.
Examples of Back-to-Back configuration include positioning one group of echo cancellers between a codec and a
transmission device or between two codecs for echo control on analog trunks.
2.3
Extended Delay Configuration
In this configuration, the two echo cancellers from the same group are internally cascaded into one 128
milliseconds echo canceller. See Figure 8. This configuration uses only one timeslot on PORT1 and PORT2 and
the second timeslot normally associated with ECB contains quiet code.
Figure 8 - Extended Delay Configuration (128 ms)
Extended Delay configuration is selected by writing a “1” into the ExtDl bit in Echo Canceller A, Control Register 1.
For a given group, only Echo Canceller A, Control Register 1, has the ExtDl bit. For Echo Canceller B Control
Register 1, Bit 0 must always be set to zero.
Table 4 shows the 2 groups of 2 cancellers that can each be configured into 64 ms or 128 ms echo tail capacity.
3.0
Echo Canceller Functional States
Each echo canceller has four functional states: Mute, Bypass, Disable Adaptation and Enable Adaptation.
3.1
Mute
In Normal and in Extended Delay configurations, writing a “1” into the MuteR bit replaces Rin with quiet code which
is applied to both the Adaptive Filter and Rout. Writing a “1” into the MuteS bit replaces the Sout PCM data with
quiet code.
LINEAR
16 bits
2’s complement
SIGN/
MAGNITUDE
-Law
A-Law
CCITT (G.711)
-Law
A-Law
+Zero
(quiet code)
0000hex
80hex
FFhex
D5hex
Table 2 - Quiet PCM Code Assignment
+
-
channel A
ECA
Sin
Sout
Rout
Rin
echo
path A
Adaptive Filter
(128 ms)
PORT1
PORT2
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ZL50233QC | 制造商:ZARLINK 制造商全称:Zarlink Semiconductor Inc 功能描述:4 Channel Voice Echo Cancellor |
| ZL50233QCC | 制造商:ZARLINK 制造商全称:Zarlink Semiconductor Inc 功能描述:4 Channel Voice Echo Cancellor |
| ZL50233QCG1 | 制造商:Microsemi Corporation 功能描述:ECHO CANCELLER CHIP 4-CH G.165/G.168/G.711 W/ TONE DETECTION - Trays 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC VOICE ECHO CANCEL 4CH 100LQFP 制造商:Microsemi Corporation 功能描述:IC VOICE ECHO CANCEL 4CH 100LQFP |
| ZL50234 | 制造商:ZARLINK 制造商全称:Zarlink Semiconductor Inc 功能描述:8 Channel Voice Echo Canceller |
| ZL50234/GDC | 制造商:Microsemi Corporation 功能描述:ECHO Canceller Chip 8-CH G.164/G.165/G.168/G.711 With Tone Detection 208-Pin LBGA Tray 制造商:Microsemi Corporation 功能描述:ECHO CANCELLER CHIP 8CH G.164/G.165/G.168/G.711 W/ TONE DETE - Trays 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC VOICE ECHO CANCEL 8CH 208LBGA 制造商:Microsemi Corporation 功能描述:IC VOICE ECHO CANCEL 8CH 208LBGA |
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