1.25G SFP EX 1550nm 40KM LC SMF Fiber Optic Transceiver

Module Block Diagram

1. Pin Definitions

2. Absolute Maximum Ratings

Parameter			Symbol	Min.	Typical	Max.	Unit	Ref.
Maximum Supply Voltage			VCC	-0.5		4.7	V
Storage Temperature			TS	-40		85	°C
Case Operating Temperature			TOP	0		70	°C

3. Optical Characteristics

Parameter			Symbol	Min.	Typical	Max.	Unit	Ref.
Transmitter
Output Opt. Pwr (End of Life)			POUT	-5		0	dBm	1
Optical Wavelength			λ	1530	1550	1570	nm
Wavelength Temperature Dependence					0.08	0.125	nm/°C
Spectral Width (-20dB)			σ			3	nm
Optical Extinction Ratio			ER	10			dB
Sidemode Suppression ratio			SSRmin	30			dB
Optical Rise/Fall Time			tr/ tf		100	160	ps
RIN			RIN			-120	dB/Hz
Transmitter Jitter (peak to peak)						100	ps
Receiver
Average Rx Sensitivity @ Gigabit Ethernet			RSENS3			-24	dBm	2
Maximum Input Power			PMAX	-3			dBm
Optical Center Wavelength			λC	1260	1550	1620	nm
LOS De -Assert			LOSD			-26	dBm
LOS Assert			LOSA	-40			dBm
LOS Hysteresis					1		dB
Receiver Jitter Generation @1.25Gbps						160	ps	3

Notes:
1. Class 1 Laser Safety per FDA/CDRH and IEC-825-1 regulations.
2. With worst-case extinction ratio. Measured with a PRBS 223-1 test pattern, @1.25Gb/s, BER<10-12 .
3. Jitter added by receiver (peak to peak). Measured at –18.0dBm average Rx sensitivity, PRBS 223-1 test pattern.

4. Pin Descriptions

Pin	Symbol	Name/Description						NOTE
1	VEET	Transmitter Ground  (Common with Receiver Ground)						1
2	TFAULT	Transmitter Fault.						2
3	TDIS	Transmitter Disable. Laser output disabled on high or open.						3
4	MOD_DEF(2)	Module Definition 2. Data line for Serial ID.						4
5	MOD_DEF(1)	Module Definition 1. Clock line for Serial ID.						4
6	MOD_DEF(0)	Module Definition 0. Grounded within the module.						4
7	Rate Select	No connection required
8	LOS	Loss of Signal indication.  Logic 0 indicates normal operation.						5
9	VEER	Receiver Ground  (Common with Transmitter Ground)						1
10	VEER	Receiver Ground  (Common with Transmitter Ground)						1
11	VEER	Receiver Ground  (Common with Transmitter Ground)						1
12	RD-	Receiver Inverted DATA out.  AC Coupled
13	RD+	Receiver Non-inverted DATA out.  AC Coupled
14	VEER	Receiver Ground  (Common with Transmitter Ground)						1
15	VCCR	Receiver Power Supply
16	VCCT	Transmitter Power Supply
17	VEET	Transmitter Ground  (Common with Receiver Ground)						1
18	TD+	Transmitter Non-Inverted DATA in. AC Coupled.
19	TD-	Transmitter Inverted DATA in.  AC Coupled.
20	VEET	Transmitter Ground  (Common with Receiver Ground)						1

Notes:
1. Circuit ground is internally isolated from chassis ground.

2. TFAULT is an open collector/drain output, which should be pulled up with a 4.7k – 10k Ohms resistor on the host board if intended
for use. Pull up voltage should be between 2.0V to Vcc + 0.3V. A high output indicates a transmitter fault caused by either the
TX bias current or the TX output power exceeding the preset alarm thresholds. A low output indicates normal operation. In the
low state, the output is pulled to <0.8V.

3. Laser output disabled on TDIS>2.0V or open, enabled on TDIS<0.8V.

4. Should be pulled up with 4.7k – 10kohms on host board to a voltage between 2.0V and 3.6V. MOD_DEF (0) pulls line low to
indicate module is plugged in.

5. LOS is open collector output. It should be pulled up with 4.7k – 10 kohms on host board to a voltage between 2.0V and 3.6V.
Logic 0 indicates normal operation; logic 1 indicates loss of signal.

5. Typical Interface Circuit

6. Electrical Interface Characteristics

Parameter			Symbol	Min.	Typical	Max.	Unit	Ref.
Supply Voltage			Vcc	3.15	3.3	3.6	V
Supply Current			Icc		185	250	mA
Transmitter
Input differential impedance			Rin		100		Ω	1
Single ended data input swing			Vin,pp	250		1200	mV
Transmit Disable Voltage			VD	Vcc–1.3		Vcc	V
Transmit Enable Voltage			VEN	Vee		Vee+ 0.8	V	2
Transmit Disable Assert Time						10	us
Receiver
Single ended data output swing			Vout,pp	250		800	mV	3
Data output rise time			tr		100	175	ps	4
Data output fall time			tf		100	175	ps	4
LOS Fault			VLOS fault	Vcc–0.5		VccHOS T	V	5
LOS Normal			VLOS norm	Vee		Vee+ 0.5	V	5
Power Supply Rejection			PSR	100			mVpp	6

Notes:
1. Connected directly to TX data input pins. AC coupled thereafter.
2. Or open circuit.
3. Into 100 ohms differential termination.
4. 20 – 80 %
5. Loss of Signal is LVTTL. Logic 0 indicates normal operation; logic 1 indicates no signal detected.
6. Receiver sensitivity is compliant with power supply sinusoidal modulation of 20 Hz to 1.5 MHz up to specified value applied
through the recommended power supply filtering network.

7. Digital Diagnostic Functions

ETU-LINK ES5512-3LCD40 transceivers support the 2-wire serial communication protocol as defined in the SFP MSA1. It is very closely related to the EEPROM defined in the GBIC standard, with the same electrical specifications.

The standard SFP serial ID provides access to identification information that describes the transceiver’s capabilities, standard interfaces, manufacturer, and other information.

Additionally, ETU-LINK SFP transceivers provide a unique enhanced digital diagnostic monitoring interface, which allows real-time access to device operating parameters such as transceiver temperature, laser bias current, transmitted optical power, and received optical power and transceiver supply voltage. It also defines a sophisticated system of alarm and warning flags, which alerts end-users when particular operating parameters are outside of a factory set normal range.

The SFP MSA defines a 256-byte memory map in EEPROM that is accessible over a 2-wire serial interface at the 8 bit address 1010000X (A0h). The digital diagnostic monitoring interface makes use of the 8 bit address 1010001X (A2h), so the originally defined serial ID memory map remains unchanged. The interface is identical to, and is thus fully backward compatible with both the GBIC Specification and the SFP Multi Source Agreement.

The operating and diagnostics information is monitored and reported by a Digital Diagnostics Transceiver Controller (DDTC) inside the transceiver, which is accessed through a 2-wire serial interface. When the serial protocol is activated, the serial clock signal (SCL, Mod Def 1) is generated by the host. The positive edge clocks data into the SFP transceiver into those segments of the E2PROM that are not write-protected. The negative edge clocks data from the SFP transceiver. The serial data signal (SDA, Mod Def 2) is bi-directional for serial data transfer.

The host uses SDA in conjunction with SCL to mark the start and end of serial protocol activation. The memories are organized as a series of 8-bit data words that can be addressed individually or sequentially.

8. Mechanical Specifications