FTCS-8512-02Dxx 1.25Gbps SFP Multimode 850nm 550m Transceiver Module

1.25Gbps SFP Transceiver, Multi Mode, 550m Reach
FTCS-8512-02Dxx

Product Features

• Supports up to 1.25Gbps bit rates
• Hot-pluggable SFP footprint
• 850nm VCSEL laser and PIN photo detector, Up to 550m for MMF transmission
• Compliant with SFP MSA and SFF-8472 with duplex LC receptacle
• Compatible with RoHS
• Single +3.3V power supply
• Real Time Digital Diagnostic Monitoring
• Operating case temperature:

Standard: 0 to +70°C

Industrial: -40 to +85°C

Applications

• 1.25Gbps Optical systems
• Gigabit Ethernet
• 1.063Gbps Fiber Channel
• Other Optical links

Description

The SFP transceivers are high performance, cost effective modules supporting data rate of 1.25Gbps and 550m transmission distance with MMF.

The transceiver consists of three sections: a VSCEL 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 and SFF-8472 digital diagnostics functions.

Temp

Vcc

LD Bias

Tx Power

Rx Power

TD+/-

TxFault

TxDis

LOS

RD+/-

POWER

SCL

SDA

LD Driver

LD

PIN+TIA

Post Amp

I2C Controller

EEPROM

ADC/DAC

Transceiver functional diagram

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

Parameter		Symbol	Min	Typical	Max	Unit
Operating Case Temperature	Standard	Tc	0		+70	°C
	Extended		-20		+80	°C
	Industrial		-40		+85	°C
Power Supply Voltage		Vcc	3.135	3.30	3.465	V
Power Supply Current		Icc			300	mA
Data Rate			0.1	1.25		Gbps

Optical and Electrical Characteristics

Parameter		Symbol		Min	Typical	Max	Unit	Notes
Transmitter
Centre Wavelength			λc	830	850	870	nm
Spectral Width（RMS）			Δλ			0.85	nm
Side-Mode Suppression Ratio			SMSR	–	–	–	dB
Average Output Power			Pout	-9		0	dBm	1
Extinction Ratio			ER	9.0			dB
Data Input Swing Differential			VIN	180		1200	mV	2
Input Differential Impedance			ZIN	90	100	110	Ω
TX Disable	Disable			2.0		Vcc	V
	Enable			0		0.8	V
TX Fault	Fault			2.0		Vcc	V
	Normal			0		0.8	V
Receiver
Centre Wavelength			λc	830		870	nm
Receiver Sensitivity						-18	dBm	3
Receiver Overload				-1			dBm	3
LOS De-Assert			LOSD			-19	dBm
LOS Assert			LOSA	-38			dBm
LOS Hysteresis				0.5		4	dB
Data Output Swing Differential			Vout	600	800	1000	mV	4
LOS			High	2.0		Vcc	V
			Low			0.8	V

Notes:

1. The optical power is launched into MMF.

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

Parameter	Symbol	Min	Typical	Max	Unit
Tx Disable Negate Time	t_on			1	ms
Tx Disable Assert Time	t_off			10	µs
Time To Initialize, including Reset of Tx Fault	t_init			300	ms
Tx Fault Assert Time	t_fault			100	µs
Tx Disable To Reset	t_reset	10			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		100	400	KHz
MOD_DEF (0:2)-High	VH	2		Vcc	V
MOD_DEF (0:2)-Low	VL			0.8	V

Diagnostics

Parameter	Range	Unit	Accuracy	Calibration
Temperature	0 to +70	°C	±3°C	Internal
	-20 to +80
	-40 to +85
Voltage	3.0 to 3.6	V	±3%	Internal
Bias Current	0 to 100	mA	±10%	Internal
TX Power	-9 to 0	dBm	±3dB	Internal
RX Power	-20 to -1	dBm	±3dB	Internal

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 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	SDA	SDA Serial Data Signal	3
5	SCL	SCL Serial Clock Signal	3
6	MOD_ABS	Module Absent. Grounded within the module	3
7	RS0	Not Connected	3
8	LOS	Loss of Signal	3	Note 3
9	VEER	Receiver ground	1
10	VEER	Receiver ground	1
11	VEER	Receiver ground	1
12	RD-	Inv. Received Data Out	3	Note 4
13	RD+	Received Data Out	3	Note 4
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 5
19	TD-	Inv. Transmit Data In	3	Note 5
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) Laser output disabled on TDIS >2.0V or open, enabled on TDIS <0.8V.

3) LOS is open collector output. Should be pulled up with 4.7k~10kΩ on host board to a voltage between 2.0V and 3.6V. Logic 0 indicates normal operation; logic 1 indicates loss of signal.

4) 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.