PEF 20954 HT V1.1 Infineon Technologies, PEF 20954 HT V1.1 Datasheet - Page 71

• 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

Table 29
Register Addr. Value
ATMAT
Modification of the AFSTC has some dramatic effect on stability and convergence
speed, be careful with those settings.
Modification of the turbo threshold is not as severe and a good means for algorithm fine-
tuning.
The lower the turbo threshold the faster the turbo mode for the affected coefficient will
be activated resulting in faster convergence.
4.4.1.3
For stability please see also the previous paragraph
Table 30
Register Addr. Value
AFSTC
Table 31
Register Addr. Value
AACSC
Data Sheet
77H
71H
78H
Stability / divergence protection
Filter coefficient adaptation speed adjustment (cont’d)
Coefficient damping
Auxiliary coefficient supervision
TURBO Up
ACSCTH Up
ACSP
T
CSPT
ACSTH
Mod.
Up
Down
Up
Down
Mod.
Down
Down
Mod.
Down
Up
Down
Effect
stability "Down", convergence speed "Up"
stability "Up", convergence speed "Down"
stability "Down", convergence speed "Up"
stability "Up", convergence speed "Down"
Effect
increase damping effect on main coef.,
convergence speed "Down", stability "Up"
convergence speed "Down", stability "Up"
convergence speed "Up", stability "Down"
Effect
stability "Down", convergence speed "Up", if
ACSCTH > 0
ACSCTH > 0
stability "Down", convergence speed "Up", if
ACSCTH > 0
ACSCTH > 0
stability "Up", convergence speed "Down", if
stability "Up", convergence speed "Down", if
71
Operational Description
Rev. 2, 2004-07-28
PEB 20954
PEF 20954