PEF 20954 HT V1.1 Infineon Technologies, PEF 20954 HT V1.1 Datasheet - Page 11

• Manufacturer Part Number: PEF 20954 HT V1.1
• Description: IC ECHO CANCELLER DGTL TQFP144
• Manufacturer: Infineon Technologies

Specifications of PEF 20954 HT V1.1

• Function: Smart Integrated Digital Echo Canceller (SIDEC)
• Interface: PCM, Serial, UCC
• Number Of Circuits: 1
• 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
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: PEF20954HTV1.1; SP000007505

PEB 20954
PEF 20954
Introduction
1
Introduction
The Smart Integrated Digital Echo Canceller (SIDEC) suppresses echoes in
telecommunication networks which might disturb any kind of terrestrial or wireless
communication. It incorporates leading edge CMOS technology as well as INFINEON’s'
many years' experience in Telecommunication ICs.
In communication links reflections resulting in an electrical echo are due to hybrid splits
or imperfect terminations in subscribe loops. Acoustical echoes may occur due to poor
isolation of microphone and speaker of some telephone system. These electrical and
acoustical echoes disturb the quality of the transmission. To ensure high quality, pure
data
transmission
the
ITU-T
(International
Telecommunications
Union,
Telecommunication Standardization Sector) suggests in the recommendation G.131 the
use of echo cancellers. Echo cancellation is extremely desirable for data links with total
round trip transmission times of more than 50 ms.
Data Sheet
11
Rev. 2, 2004-07-28