155Mb/s 1310nm Single-mode SFP Transceiver BT-SFP-I20

Pin Assignment

1. Pin Descriptions

Pin	Symbol	Name/Description	NOTE
1	VEET	Transmitter Ground  (Common with Receiver Ground)	1
2	TFAULT	Transmitter Fault.
3	TDIS	Transmitter Disable. Laser output disabled on high or open.	2
4	MOD_DEF(2)	Module Definition 2. Data line for Serial ID.	3
5	MOD_DEF(1)	Module Definition 1. Clock line for Serial ID.	3
6	MOD_DEF(0)	Module Definition 0. Grounded within the module.	3
7	Rate Select	No connection required	4
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. Laser output disabled on TDIS>2.0V or open, enabled on TDIS <0.8V.
3. 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.

4. This is an optional input used to control the receiver bandwidth for compatibility with multiple data rates (most likely Fiber Channel 1x and 2x Rates).If implemented, the input will be internally pulled down with > 30kΩ resistor. The input states are:
   • Low (0 – 0.8V): Reduced Bandwidth
   • (>0.8, < 2.0V): Undefined
   • High (2.0 – 3.465V): Full Bandwidth
   • Open: Reduced Bandwidth
5. LOS is open collector output should be pulled up with 4.7k – 10kohms on host board to a voltage between 2.0V and 3.6V. Logic 0 indicates normal operation; logic 1 indicates loss of signal.

Figure2. Pin out of Connector Block on Host Board

 

1. Absolute Maximum Ratings

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Storage Temperature	Ts	-40		85	ºC
Relative Humidity	RH	5		95	%
Power Supply Voltage	VCC	-0.5		4	V
Signal Input Voltage		-0.3		Vcc+0.3	V
Receiver Damage Threshold		5			dBm

 

III.    Recommended Operating Conditions

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Case Operating Temperature	Tcase	0		70	ºC	BT-SFP-20
		-40		85		BT-SFP-I20
Power Supply Voltage	VCC	3.13	3.3	3.47	V
Power Supply Current	ICC			280	mA
Power Supply Noise Rejection				100	mVp-p	100Hz to 1MHz
Data Rate			155/155		Mbps	TX Rate/RX Rate
Transmission Distance				20	KM
Coupled Fiber	Single mode fiber					9/125um SMF

 IV.  Specification of Transmitter

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Average Output Power	POUT	-15		-8	dBm	Note (1)
Extinction Ratio	ER	8.2			dB
Center Wavelength	λC	1270	1310	1360	nm	FP Laser
Spectrum Width (RMS)	σ			3.5	nm
Transmitter OFF Output Power	POff			-45	dBm
Differential Line Input Impedance	RIN	90	100	110	Ohm
Output Eye Mask	Compliant with G.957(class 1 laser safety)					Note (2)

 

Note (1): Measure at 2^23-1 NRZ PRBS pattern

Note (2): Transmitter eye mask definition

 

 

 V.  Specification of Receiver

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Input Optical Wavelength	λIN	1270		1610	nm
Receiver Sensitivity	PIN			-29	dBm	Note (1)
Input Saturation Power (Overload)	PSAT	-8			dBm
Los Of Signal Assert	PA			-30	dBm
Los Of Signal De-assert	PD	-38			dBm	Note (2)
LOS Hysteresis	PA-PD	0.5	2	6	dB

 

Note (1): Measured with Light source 1310nm, ER=8.2dB; BER =<10^-12 @PRBS=2^23-1 NRZ

Note (2): When LOS de-asserted, the RX data+/- output is High-level (fixed)

 

 VI.  Electrical Interface Characteristics

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Transmitter
Total Supply Current	ICC			A	mA	Note (1)
Transmitter Disable Input-High	VDISH	2		Vcc+0.3	V
Transmitter Disable Input-Low	VDISL	0		0.8	V
Transmitter Fault Input-High	VTxFH	2		Vcc+0.3	V
Transmitter Fault Input-Low	VTxFL	0		0.8	V
Receiver
Total Supply Current	ICC			B	mA	Note (1)
LOSS Output Voltage-High	VLOSH	2		Vcc+0.3	V	LVTTL
LOSS Output Voltage-Low	VLOSL	0		0.8	V

 

Note (1): A (TX) + B (RX) = 280mA    (Not include termination circuit)

 

VII.   Digital Diagnostic Functions

BT-SFP-I20 transceivers support the 2-wire serial communication protocol as defined in the SFP MSA. It is very closely related to the E2PROM 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, 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 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 E2PROM 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.

Digital diagnostics for the BT-SFP-I20 are internally calibrated by default.

 

 

VIII.  Recommend Circuit Schematic

 

IX. Mechanical Specifications (Unit: mm)

 

X. Regulatory Compliance

Feature	Reference	Performance
Electrostatic discharge（ESD）	IEC/EN 61000-4-2	Compatible with standards
Electromagnetic Interference (EMI)	FCC Part 15 Class B EN 55022 Class B (CISPR 22A)	Compatible with standards
Laser Eye Safety	FDA 21CFR 1040.10, 1040.11 IEC/EN 60825-1，2	Class 1 laser product
Component Recognition	IEC/EN 60950 ，UL	Compatible with standards
ROHS	2002/95/EC	Compatible with standards
EMC	EN61000-3	Compatible with standards

Appendix A. Document Revision

Version No.	Date	Description
1.0	2016.6.1	Preliminary datasheet