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7. Recommended Interface Circuit (AC Coupling)
Laser
Laser
Driver
Driver
Delta Transceiver
Delta Transceiver
Signal detect
Signal detect
LI M I TI NG
LI M I TI NG
Pre-
Pre-
Am p
Am p
Amplifier
Amplifier
C1/2/3
= 4.7 uF
C4/5/6/7 = 100 nF
L1/2
= 1 uH
=68 Ω (If C4/5=0, then R1/2 =82 Ω, it is for DC-coupled.)
R1/2
=180 Ω (If C4/5=0, then R3/4 =130 Ω, it is for DC-coupled.)
R3/4
=270 Ω
R7/8
WR5/6/9/10/11/12
= 510 Ω
R13
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 .
DELTA ELECTRONICS, INC.
TXGND
TXGND
9
9
TxD
TxD
8
8
TxD
TxD
7
7
VCCTx
VCCTx
6
6
L2
L2
C1
C1
VCCRx
VCCRx
5
5
L1
L1
C2
C2
SD
SD
4
4
S D to upper leve l
S D to upper leve l
R13
R13
RxD
RxD
3
3
RxD
RxD
2
2
RxGND
RxGND
1
1
Depend on SerDes chip used
VCC SerDes
VCC SerDes
3.3V
3.3V
5V
5V
C4
C4
C5
C5
VCC SerDes
VCC SerDes
5V
5V
3.3V
3.3V
C3
C3
C6
C6
C7
C7
5
OPBD-155E1J1R
VCC
VCC
TX+
TX+
ECL/PECL
ECL/PECL
DRIVER
DRIVER
TX-
TX-
Serializer/
Serializer/
De s e rialize r
De s e rialize r
RD-
RD-
Receiver
Receiver
PLL etc.
PLL etc.
RD+
RD+
Revision: S2
03/09/2007
www.deltaww.com
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