AK2548 Datasheet, PDF (27/30 Pages) Asahi Kasei Microsystems – 7 channel E1 Transceiver

ASAHI KASEI
Transmit Circuit
RECOMMENDED EXTERNAL CIRCUIT
AK2548
TTIPx
C1 _R1
R2
TRINGx
1:N
C2
Trans Rate
R1.R2
C1
C2
75Ω
1:2
8.2Ω±1%
1uF
470pF
120Ω
1:2.2
9.1Ω±1%
1uF
470pF
Received Circuit
AK2548
Rp
R1
2:1
RTIPx
R3
Rp
R4
R2
RRINGx
[AK2548]
R1,R2
R3,R4
Rp
75Ω
20Ω
130Ω
100Ω
120Ω
82Ω
160Ω
*Rp is protection resistance against surge.
Rp is used for surge current limiting. (ITU-T K.41)
Recommended Transformer Specification
Turns Primary
Leakage
Ratio Inductance Inductance
(Typ) (Min)
(Max)
Tx
75Ω 1:2
720uH
0.3uH
120Ω 1:2.2
720uH
0.3uH
Rx
1:2
1.2mH
0.3uH
Interwinding
Capacitance
(Max)
30pF
30pF
30pF
DCR
(Max)
pri
0.6Ω
0.6Ω
0.6Ω
sec
1.2Ω
1.3Ω
1.2Ω
C0028-E-00
27
1999/9