PSB21911 Datasheet, PDF (110/164 Pages) Siemens Semiconductor Group – ISDN Echocancellation Circuit for Terminal Applications IEC-Q TE

PSB 21911
PSF 21911
External Circuitry
3.4.2
U-Interface
The hybrid suggested for the PSB 21911 IEC-Q TE is identical to the hybrid
recommended for the PEB 2091 IEC-Q.
AOUT
BIN
AIN
BOUT
24 Ω
681 Ω
619 Ω
10 k Ω
10 k Ω
3.01 k Ω
C_K
10 k Ω
10 k Ω
6.8 nF
619 Ω
24 Ω
10 nF
1:1.6
10 nF
1 µF U
10 nF
ITS09706
Figure 44 U-Interface Hybrid Circuit
Note: To achieve optimum performance all capacitors of the hybrid should be MKT.
Ceramic capacitors are not recommended.
Semiconductor Group
110
11.97