ak2548 AKM Semiconductor, Inc., ak2548 Datasheet - Page 27

• Manufacturer Part Number: ak2548
• Description: 7 Channel E1 Transceiver - Asahi Kasei Microsystems
• Manufacturer: AKM Semiconductor, Inc.

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