PEF 20954 HT V1.1 Infineon Technologies, PEF 20954 HT V1.1 Datasheet - Page 72

• 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 31
Register Addr. Value
ATMAT
AACSC modifications mainly prevent misadaptation and divergence on periodical
signals. The effect is not very strong but noticeable. Be careful not to unnecessarily
activate the feature, since its effect on other functions has not been elaborately
evaluated. The strongest setting for the AACSC register would be 84H and should be
avoided. For fine-tuning play with the turbo-threshold. Lowering the turbo-threshold
might increase convergence speed and stability if the auxiliary coefficient supervision
feature is activated.
Table 32
Register
VDFCTRL
AVDDI
AVDHG
Data Sheet
77H
Addr. Value
76H
77H
74H
Auxiliary coefficient supervision (cont’d)
Sinusoidal (non-voice) signal protection
TURBO
ACSEFF
ECT
VDFRELEN
VDFREL
VDFSOL
VDMAXINTER
VAL
VDINTERVAL
VDSODELAY
Mod.
0
1
Up
Down
Mod.
0
1
Up
Down
Up
Down
Up
Down
Up
Down
Up
Effect
stability "Down", convergence speed "Up", if
ACSCTH > 0
stability "Up", convergence speed "Down", if
ACSCTH > 0
stability "Down", if AACSC.ACSCTH > 0
stability "Up", if AACSC.ACSCTH > 0
72
Effect
stability "Down", ERLE "Up"
stability "Down", ERLE "Up", if
stability "Down", convergence speed
stability "Up", ERLE "Down",
VDFRELEN = 1
stability "Up", ERLE "Down", if
VDFRELEN = 1
stability "Down", ERLE "Up"
stability "Up", ERLE "Down"
stability "Down", convergence speed
"Up", if activated
stability "Up", convergence speed
"Down", if activated
"Up", if activated
stability "Up", convergence speed
"Down", if activated
stability "Up", convergence speed
"Down", if activated
Operational Description
Rev. 2, 2004-07-28
PEB 20954
PEF 20954