PEF 20954 HT V1.1 Infineon Technologies, PEF 20954 HT V1.1 Datasheet - Page 161

• 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
Glossary
echo return loss enhancement (ERLE) (A
)
CANC
The attenuation of the echo signal as it passes through the send path of an echo
canceller. This definition specifically excludes any non-linear processing on the output of
the canceller to provide for further attenuation.
electric echo
Electric echoes consist of reflected signals caused by the near-end impedance
mismatch, e.g. at a 2-wire/4-wire conversion unit (hybrid).
far end
The side of an echo canceller which does not contain the echo path on which the echo
canceller is intended to operate.
H register
The register within the echo canceller which stores the impulse response model of the
echo path.
leak time
The interval between the instant a test signal is removed from the receive-in port of a
fully-converged echo canceller and the instant the echo path model in the echo canceller
changes such that, when a test signal is reapplied to R
with the convergence circuitry
in
inhibited, the returned echo is at a defined level.
This definition refers to echo cancellers employing, for example, leaky integrators in the
convergence circuitry.
cancelled-end
The side of an echo canceller which contains the echo path on which the echo canceller
is intended to operate. This includes all transmission facilities and equipment (including
the hybrid and terminating telephone set) which is included in the echo path.
non-linear processor (NLP)
A device having a defined suppression threshold level and in which:
a)signals having a level detected as being below the threshold are suppressed; and
b)signals having a level detected as being above the threshold are passed although the
signal may be distorted.
NOTE 1 – The precise operation of a NLP depends upon the detection and control
algorithm used.
Data Sheet
161
Rev. 2, 2004-07-28