Ascent Communication Technology

25G SFP28 AOC Cable

Ascent’s SFP28 active optical cable assembly features provides data transmission channels at speeds up to 25.78 Gbps, and 25G Ethernet requirements. It is available in a broad range of wire gages and wire lengths. This 25G cable assembly is hot-pluggable and features low power consumption. It is suitable for 25GBASE-SR Ethernet applications, and is compliant with SFP+ MSA, SFF-8431 and SFF-8432. Designed for applications in the data center, networking and telecommunications markets that require a high speed, reliable cable assembly, this next generation product shares the same mating interface with QSFP+ form factor, making it backward compatible with existing QSFP ports. QSFP28 can be used with current 10G and 14G applications with substantial signal integrity margin.

• Up to 25.7813 Gbps Data Links

• 850 nm VCSEL laser transmitter and PIN/TIA receiver

• Maximum link length of 100m on OM3 MMF

• Hot-pluggable SFP+ footprint

• Power consumption less than 1W

• RoHS compliant and lead-free

• Supports Digital Diagnostic Monitor interface

• +3.3V Single power supply

• Case operating temperature Commercial: 0°C to +70°C
• Compliant with SFF-8432

• RoHS compliant

Absolute Maximum Ratings

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Maximum Supply Voltage	Vcc	-0.5		3.6	V
Storage Temperature	Ts	-40		85	°C	1
Case Operating Temperature	Top	0		70	°C
Relative Humidity	RH	0		85	%	2

Notes:

1. Limited by the fiber cable jacket, not the active ends.
2. Non-condensing.

Electrical Characteristics (TOP V_CC=0 to 70°C,=3.3 ± 5% Volts)
Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Supply Voltage	Vcc	3.15	3.45		V
Supply Current Transmitter	Icc		300		mA
Input differential impedance	Rin		100		Q	1
Differential data input swing	Vin,pp	200	1000		mV
Transmit Disable Voltage	VD	2	VCC		V
Transmit Enable Voltage Receiver	Ven	Vee	Vee+0.8		V
Differential data output swing	Vout,pp	200	100		mV	2
LOS Fault	VLOS_fault	2	VccHOST		V	3
LOS Normal	VLOS_norm	Vee	Vee+0.8		V	3
Power Supply Noise Tolerance	Vcct/Vccr	Per SFF-8431 Rev 4.1			mVpp	4

Notes:

1. Connected directly to TX data input pins.AC coupling from pins into laser driver IC.

2. Into 100 Q differential termination.

3. 20 % to 80 %. Measured with Module Compliance Test Board and OMA test pattern. Use of four 1's and four 0's in sequence in the PRBS^A9 is an acceptable alternative. SFF-8431 Rev 4.1

4. LOS is an open collector output. Should be pulled up with 4.7 kQ to 10 kQ on the host board. Normal operation is logic 0; loss of signal is logic 1. Maximum pull-up voltage is 5.5 V.

5. Testing methodology per SFF-8431. Rev 4.1