User's Manual

OPBD-155F2J1R
DELTA ELECTRONICS, INC.
5 Revision: S2
03/09/2007
www.deltaww.com
7. Recommended Interface Circuit (AC Coupling)
Laser
Driver
LIMIT IN G
Amplifi er
Serializer/
De se rializer
ECL/PECL
DRIVER
Receiver
PLL etc.
VCC
TX+
TX-
RD-
RD+
VCC SerDes
3.3V
TXGND
TxD
TxD
VCCRx
VCC SerDes
3.3V
Pre-
Amp
SD
RxD
RxD
RxGND
VCCTx
Delta Transceiver
C2
C1
L2
L1
Signal detect
SD to upper level
R13
R12
R9
R10
R11
R6
R5
R3
R4 R2
R1
R7 R8
C3
C6
C7
C4
C5
1
2
3
4
5
6
7
8
9
3.3V
3.3V
Laser
Driver
LIMIT IN G
Amplifi er
Serializer/
De se rializer
ECL/PECL
DRIVER
Receiver
PLL etc.
VCC
TX+
TX-
RD-
RD+
VCC SerDes
3.3V
TXGND
TxD
TxD
VCCRx
VCC SerDes
3.3V
Pre-
Amp
SD
RxD
RxD
RxGND
VCCTx
Delta Transceiver
C2
C1
L2
L1
Signal detect
SD to upper level
R13
R12
R9
R10
R11
R6
R5
R3
R4 R2
R1
R7 R8
C3
C6
C7
C4
C5
1
2
3
4
5
6
7
8
9
3.3V
3.3V
C1/2/3 = 4.7 uF
C4/5/6/7 = 100 nF
L1/2 = 1 uH
R1/2 =82 Ω (If C4/5=0, then R1/2 =130 Ω, it is for DC-coupled.)
R3/4 =130 Ω (If C4/5=0, then R3/4 =82 Ω, it is for DC-coupled.)
R7/8 =150
Ω
R5/6/9/10/11/12 Depend on SerDes chip used
R13 = 270 Ω
Value of R5/6/9/10/11/12 may vary as long as proper 50
Ω
termination or differential 100
Ω
is
provided. For good EMI performance, the power supply filter is required. Use shorter tracks from the
inductor L1/2 to the module VccTx/VccRx .