PEF 20954 HT V1.1 Infineon Technologies, PEF 20954 HT V1.1 Datasheet - Page 48

• 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

Figure 9
3.2.2
Figure 10
configured via UCC, Serial and P Interface.
Setting NLPDIS ='1' (pin or register setting) leads to bypassing of the Non Linear
Processor.
Setting BYPASS = '1' (Serial control signal, UCC or 2100 Hz tone via register settings)
results in bypassing the Attenuator in the Receive Path as well as in bypassing the
Subtractor, the Non Linear Processor and the Attenuator in the Send Path.
Disabling a channel or the complete canceller will result in a BYPASS function, a H-
Register reset and a reset of the Speech Control Unit. A bypassed or disabled channel
of the SIDEC can still be converted from A/ - Law or vice versa.
If a Modem call is detected the user can define what action is related to the detection of
a Modem call (2100 Hz with phase reversal or without reversal): bypassing, NLP
bypassing, H-Register Reset or combination of the functions.
The 64 Clear mode is activated by bypassing and defining the same Law Conversion at
near end and far end. In 64 Clear mode the signal is still passed through the frame
alignment.
For testing purposes the canceller can be completly bypassed by setting SBYPASS and
RBYPASS.
The Receive out signal can be input directly to the Send In port by setting the RSLOOP
='1'. The Send out signal can be input directly to the Receive in port by setting the
SRLOOP ='1'. If both loops are configured only RSLOOP will be enabled in the SIDEC.
Data Sheet
CONFLAW.CHIND
channel individual
configuration via
configuration via
CONFLAW[2:0]
CHCTRL[7:5]
global
1
0
depicts the bypass and disabling functions of the SIDEC. They can be
Bypass and Disabling Functions
CHCTRL0-31.CONVDIS
CHCTRL0-31.CONVDIS
Explanation of Options for A- and -Law Conversion
possible
conversion
possible
conversion
1
0
1
0
disable
conversion
CHCTRL0-31.ENPCTRL
disable
conversion
CHCTRL0-31.ENPCTRL
possible
conversion
1
0
1
0
enable
conversion
enable
conversion
48
UCC or Ser.Control
UCC or Ser.Control
1
0
1
0
disable
conversion
enable
conversion
disable
conversion
enable
conversion
Functional Description
GLAWFE/GLAWNE
ILAWFE/ILAWNE
GCONVDISLAW
Rev. 2, 2004-07-28
ICONVDISLAW
PEB 20954
PEF 20954
1
0
1
0
1
0
1
0
Law Conversion
A-law
-law