Alpha Bridge AB-25G-40T Datasheet

Product Features

• Up to 78Gbps Data Links
• Up to 40km transmission on SMF
• 1270nm/1310nm DFB Laser and APD receiver
• Metal enclosure, for lower EMI
• 2-wire interface with integrated Digital Diagnostic monitoring
• Hot-pluggable SFP28 footprint
• Compliant with SFP+ MSA and SFF-8472 with duplex LC receptacle
• Single 3V power supply
• Power dissipation < 5 W
• Operating case temperature:0 to +70°C

Applications

• 25GBASE-ER
• eCPRI and CPRI

Standard

• Compliant with SFF-8472 &8431
• RoHS Compliant.

Absolute Maximum Ratings

Parameter	Symbol	Min	Max	Unit
Storage Temperature	Ts	-40	85	°C
Relative Humidity	RH	5	95	%
Power Supply Voltage	VCC	-0.3	4	V
Signal Input Voltage	VSI	Vcc-0.3	Vcc+0.3	V
Rx Damage Threshold	PRdmg	-3		dBm

Recommended Operating Conditions

Parameter	Symbol	Min	Typical	Max	Unit
Case Operating Temperature	Tcase	0		70	°C
Power Supply Voltage	VCC	3.14	3.3	3.47	V
Power Supply Current	ICC			420	mA
Data Rate	BR		25.78		Gbps
Transmission Distance	TD			40	km
Coupled fiber	Single mode fiber

Optical and Electrical Characteristics

Parameter		Symbol	Min	Typical	Max	Unit	Notes
Transmitter
Centre Wavelength		λc	1260	1270	1280	nm
Spectral Width（-20dB）		Δλ			1	nm
Average Output Power		Pout	0		6	dBm
Average Launched Power(Laser Off)		Poff			-30	dBm
Extinction Ratio		ER	3.5			dB	1
Input differential impedance		Rin		100		Ω	2
Single ended data input swing		Vin,pp	180		700	mV
TX Disable	Disable		2		Vcc+0.3	V
	Enable		0		0.8	V
TX Fault	Fault		2		Vcc+0.3	V
	Normal		0		0.8	V
Output Eye Mask		{0.31,0.4,0.45,0.34,0.38,0.4}
Receiver
Centre Wavelength		λc	1300	1310	1320	nm
Receiver Sensitivity					-17.5	dBm	3
Input Saturation Power (Overload)			-6			dBm
Los Of Signal Assert		Pa	-35			dBm
Los Of Signal De-assert		Pd			-19	dBm
LOS -Hysteresis		PHys	0.5	2	6	dB
Differential data output swing		Vout,pp	300		850	mV	4
LOS	High		2		Vcc+0.3	V
	Low				0.8	V

Pin Descriptions

Pin	Symbol	Name/Description	Notes
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	SDA	2-wire Serial Interface Data Line	4
5	SCL	2-wire Serial Interface Clock Line	4
6	MOD_ABS	Module Absent. Grounded within the module	4
7	RS0	Rate Select 0, internal pull down	5
8	LOS	Loss of Signal indication. Logic 0 indicates normal operation.	6
9	RS1	Rate Select 1, internal pull down	5
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

Ordering information

Part Number	Description
AB-25G-40T	1270T/1310R,25.78Gbps, LC,40km,0°C~+70°C, with DDM

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