PEF 20954 HT V1.1 Infineon Technologies, PEF 20954 HT V1.1 Datasheet - Page 162

• 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

NOTE 2 – An example of a NLP is an analogue center clipper in which all signal levels
below a defined threshold are forced to some minimum value.
non-linear processing loss (A
Additional attenuation of residual echo level by a NLP placed in the send path of an echo
canceller.
pure delay (t
The delay from the R
echo path transmission facilities, not including dispersion time due to the network
elements. In this case, the transit time directly across the hybrid is assumed to be zero
(see
Figure 51
residual echo level (L
The level of the echo signal which remains at the send-out port of an operating echo
canceller after imperfect cancellation of the circuit echo. It is related to the receive-in
signal L
L
Any non-linear processing is not included.
returned echo level (L
The level of the signal at the send-out port of an operating echo canceller which will be
returned to the talker. The attenuation of a NLP is included, if one is normally present.
Data Sheet
RES
Figure
= L
h (t)
Rin
RIN
by:
51).
-A
r
)
Example of an impulse response of an echo path
ECHO
t
r
- A
out
RES
RET
CANC
port to the Sin port due to the delays inherent in the near-end
)
)
NLP
)
t
d
162
T1524870-96
Rev. 2, 2004-07-28
PEB 20954
PEF 20954
Glossary