PEF 20954 HT V1.1 Infineon Technologies, PEF 20954 HT V1.1 Datasheet - Page 47

• 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

3.2
3.2.1
The SIDEC allows channel individual conversion.
of the different options for the A- to - or
requirements of the application two settings can be configured: Either global or channel
individual law conversion.
Global A- to
If this modus is chosen by setting CONFLAW.CHIND=’0’ all 32 PCM channels are
converted according to the settings of GALAWFE for the far end and GALAWNE for the
near end. A ‘1’ in GALAWFE and GALAWNE indicates that A-Law is used for the
corresponding end. A ‘0’ indicates usage of -Law. The conversion can be disabled
channel individually by setting the CHCTRL0-31.CONVDIS = ‘1’ via software. Law
decoding/encoding is then carried out according to GCONVDISLAW. To activate the
serial control signal and the UCC interface as disabling source for the PCM law
conversion the bits CHCTRL0-31.ENPCTRL must be set to ‘0’.
Channel individual A- to - and - to A-Law conversion:
For channel individual conversion the user can configure independently for each channel
whether A- to -, - to A- or no Law conversion is selected via setting IALAWNE for the
near end and IALAWFE for the far end with the corresponding value for A- or -Law. The
conversion can be disabled channel individually by setting the CHCTRL0-31.CONVDIS
= ‘1’ via software. Law decoding/encoding is then carried out according to CHCTRL0-
31.CONVDISLAW. To activate the serial control signal and the UCC interface as
disabling source for the PCM law conversion the bits CHCTRL0-31.ENPCTRL must be
set to ‘0’.
Data Sheet
Description of Functional Features
Channelwise and Global A- and -Law Conversion
and
to A-Law conversion:
47
to A-Law conversion. Depending on the
Figure 9
depicts the implementation
Functional Description
Rev. 2, 2004-07-28
PEB 20954
PEF 20954