V23826-K305-C13 Datasheet, PDF (11/17 Pages) Infineon Technologies AG – Multimode 850 nm 1.0625 Gbit/s Fibre Channel 1.3 Gigabit Ethernet 1x9 Transceiver

V23826-K305-Cxx/Cxxx
Application Notes
Multimode 850 nm Gigabit Ethernet/Fibre Channel 1x9 Transceiver,
DC/DC Version
Laser
Driver
VEETx 9
TD+ 8
C6
1)
TD− 7
C7
VCC SerDes
5 V / 3.3 V
Infineon Transceiver
Signal
Detect
Pre-
Amp
Limiting _RD+
Amplifier
RD−
VCCTx 6
C1
VCCRx 5
C2
SD 4
1)
RD+ 3
RD− 2
L1
VCC
5 V / 3.3 V
L2
C3
SD to upper level
R9
C4
C5
VEERx 1
VCC
Tx+
ECL/PECL
Driver
Tx-
Serializer/
Deserializer
RD-
RD+
Receiver
PLL etc.
C1/2/3 = 4.7 µF
C4/5/6/7 = 100 nF
L1/2 = 1 µH
R5/6 = 270 Ω (5 V)
= 150 Ω (3.3 V)
R7/8 = 127 Ω (5 V)
= 82 Ω (3.3 V)
(depends on SerDes chip used)
R9
= 510 Ω (5 V)
= 270 Ω (3.3 V)
R10/11 = 82 Ω (5 V)
= 127 Ω (3.3 V)
(depends on SerDes chip used)
Place R1/2/3/4 close to SerDes chip, depends on SerDes chip
used, see application note of SerDes supplier.
Place R5/6/7/8/10/11 close to Infineon transceiver.
1) Design criterion of the capacitor used is the resonant
frequency and its value must be in the order of the nominal
data rate. Short trace lengths are mandatory.
File: 1389
Figure 5
This Application Note assumes Fiber Optic Transceivers using 5 V power supply and
SerDes Chips using 3.3 V power supply. It also assumes self biasing at the receiver data
inputs (RD+/RD–) of the SerDes chip. Refer to the manufacturer data sheet for other
applications. 3.3 V-Transceivers can be directly connected to SerDes-Chips using
standard PECL Termination network.
Value of R1 may vary as long as proper 50 Ω termination to V_EE or 100 Ω differential is
provided. The power supply filtering is required for good EMI performance. Use short
tracks from the inductor L1/L2 to the module V_CCRx/V_CCTx.
The transceiver contains an automatic shutdown circuit. Reset is only possible if the
power is turned off, and then on again. (V_CCTx switched below V_TH).
Application Board available on request.
Data Sheet
11
2004-01-27