PEB 20954 HT V1.1 Infineon Technologies, PEB 20954 HT V1.1 Datasheet - Page 19
PEB 20954 HT V1.1
Manufacturer Part Number
PEB 20954 HT V1.1
Description
IC SIDEC T/E 32CHAN TQFP-144-8
Manufacturer
Infineon Technologies
Datasheet
1.PEB_20954_HT_V1.1.pdf
(164 pages)
Specifications of PEB 20954 HT V1.1
Function
Smart Integrated Digital Echo Canceller (SIDEC)
Interface
PCM, Serial, UCC
Number Of Circuits
4
Voltage - Supply
3 V ~ 3.6 V
Current - Supply
350mA
Power (watts)
900mW
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
144-LFQFP
Includes
Double Talk Detection, Maskable Disabling, Voiceband Echo Cancelling
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
PEB20954HTV1.1T
PEB20954HTV11XP
SP000007504
SP000007506
PEB20954HTV11XP
SP000007504
SP000007506
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Figure 5
Due to voice compression and error correction the one way transmission time for
wireless voice signals is typically 90 ms. With 180 ms roundtrip time the 50 ms roundtrip
time for echo free transmission is exceeded by at least 130 ms. Hence, the speaker on
the mobile phone will hear any kind of echo generated in the hybrid next to the POTS or
the acoustical echo of the POTS. The SIDEC suppresses those two kinds of echoes if it
is incorporated in the MSC. Depending on the individual call the end echo path can differ
dramatically. In Europe the end echo path could even go to different countries causing
strong dispersion of the echo. Only a high quality echo canceller with long end path delay
options guarantees compensation of the strongly varying echoes.
Data Sheet
POTS
POTS
POTS
POTS
Echo
SIDEC in a Wireless System
E1/T1
TRAU:
MSC:
SIDEC
Transcoder Rate Adaptor Unit
Mobile Switching Center
MSC
TRAU
19
TRAU
BTS
BSC:
BTS:
Base Station Controller
Base Transceiver Station
BSC
round trip time: 180 ms
BTS
BTS
SIDEC in a WL System
Rev. 2, 2004-07-28
Introduction
PEB 20954
PEF 20954
BTS
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