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1.25Gbps CWDM SFP Optical Transceiver, SPT-PCXX1G-40D

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1.25Gbps CWDM SFP Optical Transceiver, SPT-PCXX1G-40D

SPT-PCXX1G-40(D)

1.25Gbps CWDM SFP Optical Transceiver, 40km Reach

Features

Data-rate of 1.25Gbps operation
18 CWDM DFB wavelengths laser and PIN photodetector for 40km transmission
Compliant with SFP MSA and SFF-8472 with duplex LC receptacle
Digital Diagnostic Monitoring:Internal Calibration or External Calibration
Compatible with SONET OC-24-LR-1
Compatible with RoHS
+3.3V single power supply
Operating case temperature: Standard: 0 to +70°C

Applications

Gigabit Ethernet
Fiber Channel
Switch to Switch interface
Switched backplane applications
Router/Server interface
Other optical transmission systems

Description

The SFP transceivers are high performance, cost effective modules supporting data-rate of 1.25Gbps and 40km transmission distance with SMF. The transceiver consists of three sections: an uncooled CWDM DFB laser transmitter, a PIN photodiode integrated with a trans-impedance preamplifier (TIA) and MCU control unit. All modules satisfy class I laser safety requirements.

The transceivers are compatible with SFP Multi-Source Agreement (MSA) and SFF-8472. For further Information, please refer to SFP MSA.

Absolute Maximum Ratings

Table 1 - Absolute Maximum Ratings

Parameter	Symbol	Min	Max	Unit
Supply Voltage	Vcc	-0.5	4.5	V
Storage Temperature	Ts	-40	+85	°C
Operating Humidity	-	5	85	%

Recommended Operating Conditions

Table 2 - Recommended Operating Conditions

Parameter		Symbol	Min	Typical	Max	Unit
Operating Case Temperature	Standard	Tc	0		+70	°C
Power Supply Voltage		Vcc	3.13	3.3	3.47	V
Power Supply Current		Icc			300	mA
Data Rate				1.25		Gbps

SPT-PCXX1G-40(D)

See table3 below for “xx” values

Table3 -λC Wavelength Guide

λC Wavelength Guide

Code

λC

Unit

Code

λC

Unit

Code

λC

Unit

Code

λC

Unit

1270

1370

1470

1570

1290

1390

1490

1590

1310

1410

1510

1610

1330

1430

1530

1350

1450

1550

Optical and Electrical Characteristics

SPT-PCXX1G-40(D):(CWDM and PIN,40km Reach)

Table 4 - Optical and Electrical Characteristics

Parameter		Symbol		Min	Typical	Max	Unit	Notes
Transmitter
Centre Wavelength			λc	λc-6.5	λc	λc+6.5	nm
Spectral Width (-20dB)			∆λ			1	nm
Side Mode Suppression Ratio			SMSR	30			dB
Average Output Power			Pout	-5		0	dBm	1
Extinction Ratio			ER	9			dB
Optical Rise/Fall Time (20%~80%)			tr/tf			0.26	ns
Data Input Swing Differential			VIN	400		1800	mV	2
Input Differential Impedance			ZIN	90	100	110	Ω
TX Disable	Disable			2.0		Vcc	V
TX Disable	Enable			0		0.8	V
TX Fault	Fault			2.0		Vcc	V
TX Fault	Normal			0		0.8	V
Receiver
Receiver Sensitivity						-23	dBm	3
Receiver Overload				-3			dBm	3
LOS De-Assert			LOSD			-24	dBm
LOS Assert			LOSA	-35			dBm
LOS Hysteresis				1		4	dB
Data Output Swing Differential			Vout	370		1800	mV	4
LOS			High	2.0		Vcc	V
LOS			Low			0.8	V

Notes:

1. The optical power is launched into SMF.

2. PECL input, internally AC-coupled and terminated.

3. Measured with a PRBS 27-1 test pattern @1250Mbps, BER ≤1×10-12.

4. Internally AC-coupled.

Timing and Electrical

Table 5 - Timing and Electrical

Parameter

Symbol

Min

Typical

Max

Unit

Tx Disable Negate Time

t_on

Tx Disable Assert Time

t_off

µs

Time To Initialize, including Reset of Tx Fault

t_init

300

Tx Fault Assert Time

t_fault

100

µs

Tx Disable To Reset

t_reset

µs

LOS Assert Time

t_loss_on

100

µs

LOS De-assert Time

t_loss_off

100

µs

Serial ID Clock Rate

f_serial_clock

400

KHz

MOD_DEF (0:2)-High

Vcc

MOD_DEF (0:2)-Low

0.8

Diagnostics

Table 5 – Diagnostics Specification

Parameter

Range

Unit

Accuracy

Calibration

Temperature

0 to +70

°C

±3°C

Internal / External

Voltage

3.0 to 3.6

±3%

Internal / External

Bias Current

0 to 100

±10%

Internal / External

TX Power

0 to~ -5

dBm

±3dB

Internal / External

RX Power

-23 to -3

dBm

±3dB

Internal / External

Digital Diagnostic Memory Map

The transceivers provide serial ID memory contents and diagnostic information about the present operating conditions by the 2-wire serial interface (SCL, SDA).

The diagnostic information with internal calibration or external calibration all are implemented, including received power monitoring, transmitted power monitoring, bias current monitoring, supply voltage monitoring and temperature monitoring.

The digital diagnostic memory map specific data field defines as following.

Pin Definitions

Pin Diagram

Pin Descriptions

Pin	Signal Name	Description	Plug Seq.	Notes
1	VEET	Transmitter Ground	1
2	TX FAULT	Transmitter Fault Indication	3	Note 1
3	TX DISABLE	Transmitter Disable	3	Note 2
4	MOD_DEF(2)	SDA Serial Data Signal	3	Note 3
5	MOD_DEF(1)	SCL Serial Clock Signal	3	Note 3
6	MOD_DEF(0)	TTL Low	3	Note 3
7	Rate Select	Not Connected	3
8	LOS	Loss of Signal	3	Note 4
9	VEER	Receiver ground	1
10	VEER	Receiver ground	1
11	VEER	Receiver ground	1
12	RD-	Inv. Received Data Out	3	Note 5
13	RD+	Received Data Out	3	Note 5
14	VEER	Receiver ground	1
15	VCCR	Receiver Power Supply	2
16	VCCT	Transmitter Power Supply	2
17	VEET	Transmitter Ground	1
18	TD+	Transmit Data In	3	Note 6
19	TD-	Inv. Transmit Data In	3	Note 6
20	VEET	Transmitter Ground	1

Notes:

Plug Seq.: Pin engagement sequence during hot plugging.

1) TX Fault is an open collector output, which should be pulled up with a 4.7k~10kΩ resistor on the host board to a voltage between 2.0V and Vcc+0.3V. Logic 0 indicates normal operation; Logic 1 indicates a laser fault of some kind. In the low

state, the output will be pulled to less than 0.8V.

2) TX Disable is an input that is used to shut down the transmitter optical output. It is pulled up within the module with a

4.7k~10kΩ resistor. Its states are:

Low (0 to 0.8V): Transmitter on

(>0.8V, < 2.0V): Undefined

High (2.0 to 3.465V): Transmitter Disabled

Open: Transmitter Disabled

3) Mod-Def 0,1,2. These are the module definition pins. They should be pulled up with a 4.7k~10kΩ resistor on the host board. The pull-up voltage shall be VccT or VccR.

Mod-Def 0 is grounded by the module to indicate that the module is present

Mod-Def 1 is the clock line of two wire serial interface for serial ID Mod-Def 2 is the data line of two wire serial interface for serial ID

4) LOS is an open collector output, which should be pulled up with a 4.7k~10kΩ resistor. Pull up voltage between 2.0V and

Vcc+0.3V. Logic 1 indicates loss of signal; Logic 0 indicates normal operation. In the low state, the output will be pulled to less than 0.8V.

5) RD-/+: These are the differential receiver outputs. They are internally AC-coupled 100 differential lines which should be terminated with 100Ω (differential) at the user SERDES.

6) TD-/+: These are the differential transmitter inputs. They are internally AC-coupled, differential lines with 100Ω differential termination inside the module.

Recommended Interface Circuit