PEF 20954 HT V1.1 Infineon Technologies, PEF 20954 HT V1.1 Datasheet - Page 43

• 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
3.1
Figure 8
The following paragraphs describe the functions of the SIDEC block diagramm shown in
Figure
3.1.1
The Speech Control analyzes the data from the PCM Input Interfaces and external inputs
and supervises the functions of the other system components. As soon as the far end
subscriber talks, the Adaptive Echo Estimation Unit is activated by the Speech Control.
If the double talk condition is detected or a non speech signal with an adequate echo loss
enhancement is identified by the Speech Control, the content of the Adaptive Echo
Estimation Unit is frozen. Under specific circumstances a reset of the H-Register
Data Sheet
with echo path
Receive Out
Near End
Receive Path
Send In
Send Path
8.
Functional Description
Functional Block Diagram and Description
Speech Control
Block Diagram
PCM Output
PCM Input
Interface
Interface
UCCI
Estimation Unit
Adaptive Echo
Reset and
Watchdog
Subtractor
Logic
JTAG
Speech Control
RAM
BIST
Microprocessor
43
Interface
Non Linear
Processor
Control
Clock
Disabling Logic
Serial Interface
Functional Description
PCM Output
PCM Input
Interface
Interface
(connected
to all units)
Test
Rev. 2, 2004-07-28
Receive Path
Functional Block Diagram
Send Path
Send Out
PEB 20954
PEF 20954
Receive In
far end subscriber
Remote End with