LCP-1250 Delta Electronics, Inc., LCP-1250 Datasheet - Page 6

• Manufacturer Part Number: LCP-1250
• Description: Rohs Compliant Single Mode Sfp Transceiver For Gbe And Fiber Channel Electronics, .
• Manufacturer: Delta Electronics, Inc.

7) VccR and VccT are the receiver and transmitter power supplies. They are defined as 3.3V ±5% at the
8) TD-/+: These are the differential transmitter inputs. They are AC-coupled, differential lines with 100Ÿ
Recommend Circuit Schematic
DELTA ELECTRONICS, INC.
module and is thus not required on the host board. The voltage swing on these lines will be between
370 and 2000 mV differential (185 – 1000 mV single ended) when properly terminated.
SFP connector pin. Maximum supply current is 300mA. Recommended host board power supply
filtering is shown below. Inductors with DC resistance of less than 1 ohm should be used in order to
maintain the required voltage at the SFP input pin with 3.3V supply voltage. When the recommended
supply-filtering network is used, hot plugging of the SFP transceiver module will result in an inrush
current of no more than 30mA greater than the steady state value. VccR and VccT may be internally
connected within the SFP transceiver module.
differential termination inside the module. The AC coupling is done inside the module and is thus not
required on the host board. The inputs will accept differential swings of 500 – 2400 mV (250 – 1200
mV single-ended), though it is recommended that values between 500 and 1200 mV differential (250 –
600 mV single-ended) be used for best EMI performance.
Protocol IC
Protocol Vcc
Tx_Disable
Tx_Fault
Rx_LOS
SerDes IC
PLD / PAL
VCC
RES1
RES1 = 4.7k to 10k Ohms
* Depands on SerDes IC used
100 Ohms*
RES1
3.3V
3.3V
RES1
10uF
RES1
6
RES1
0.1uF
1uH
1uH
10uF
Mod_def 2
Mod_def 1
Mod_def 0
Tx_Disable
Rx_LOS
Tx_Fault
0.1uF
TD +
TD -
VeeT
RD +
RD -
VeeR
0.1uF
VccT
VccR
0.01uF
0.01uF
0.01uF
0.01uF
DELTA SFP Module
100 Ohms
www.deltaww.com
Laser Driver
Preamp &
Quantizer
EEPROM
10k Ohms
Aug., 2006
Photo Diode
Laser Diode
Rev. 6A