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400G QSFPDD SR8 Optical Transceiver

 8 independent parallel optical channels
 Each channel data rate up to 26.56GBaud with CDR
 Hot Pluggable
 Up to 100m link on OM4 Multi-mode
 850nm VCSEL/PD Array Technology
 CML Compatible electrical I/O
 QSFP-DD MSA Compliance
 Optical connectivity via industry standard MPO/MTPterminated fiber ribbon
 MPO-16APCOpticalReceptacleType
 CMIS 4.0 Compliance
 Monitors for VCSEL bias, transmitted, received power , module temperature, and module supply  RoHS II Compliance
 Case Operating Temperature:Commercial: 0 to 70oC

Applications

 Highperformancecomputinginterconnect  Datacenter

Description

QDD-MM85QG-SR8C is a QSFP-DD Optical transceiver for 8 x 26.56GBaud optical links. It is compliant with the QSFP-DD MSA specifications. It operates at 26.56GBaud up to 100m over OM4 Multi- mode fiber.

Parameter	Symbol	Min	Max	Units	Notes
Storage Ambient Temperature	Tstg	-40	+85	oC	Exceeding the Absolute Maximum Ratings may cause irreversible damage to the device. The device is not intended to be operated under the condition of sim- ultaneous Absolute Maximum Ratings, a condition which may cause irreversible damage to the device. RH is Non- condensing condition.
Relative Humidity - Storage	RHS	0	95	%
Relative Humidity - Operating	RHO	0	85	%
Module Supply Voltage	VCC	-0.5	3.6	V

Recommended Operating Conditions

Parameter	Symbol	Min	Typ	Max	Units	Notes
Case Operating Temperature	Tcase	0	+25	+70	oC	Temperature Range = C
Module Supply Voltage	VCC	3.14	3.3	3.46	V
Power Consumption	P			10	W
Signaling Speed PerChannel	S		26.56		GBd

Transmitter Electrical Interfaces

Parameter	Symbol	Min	Typ	Max	Units	Notes
Tx_Data Differential Input Voltage	VIN			900	mV
Tx_Data Differential Input Impedance	ZIN		100		Q
Rx_Data Differential Output Voltage	VOUT			900	mV
Rx_Data Differential Output Impedance	ZOUT		100		Q

Average Launch Power ,each lane	POUT	-6.5	4	dBm	Average Optical Out-put
Outer Optical Modulation Amplitude each lane	OMAouter	-4.5	3	dBm
Optical Output with Tx OFF	POFF		-30	dBm
Extinction ratio	ER	3		dB
RMS Spectral Width	Δλ		0.6	nm
Transmitter and dispersion eye closure (TDECQ) each lane	TDECQ		4.5	dB
Launch power in OMAouter minus TDECQ, each lane (min)		-5.9		dB
TDECQ – 10log10(Ceq), each lane (max)			4.5	dB
RIN12 OMA	RIN12 OMA		-128	dB/Hz
Optical return loss tolerance (Max)	ORLT		12	dB

Receiver Optical Characteristics

Parameter	Symbol	Min	Typ	Max	Units	Notes
Center Wavelength	λ	840	850	860	nm
Signaling rate, each lane	SR		26.56		GBd
Signaling Speed Accuracy		-100		100	ppm
Modulation format		PAM4
Average power at receive input, eachlane	PIN	-8.4		4	dBm	Note1
Receive power (OMAouter), eachlane (max)				3	dBm
Receiver sensitivity (OMAouter) eachlane	Sen			max(–6.6, SECQ – 8)	dBm	Note2
Rx_LOS of Signal - Assert	PA	-24.6			dBm
Rx_LOS of Signal - Deassert	PD			-7	dBm
Rx_LOS of Signal - Hysteresis	PHy	0.5			dB
Note 1: Average received power where the BER = 2.4E-4 measured with a PRBS 31Q test pattern@26.56GBaud Note 2: Sensitivity where the BER = 2.4E-4 measured with a PRBS 31Q test pattern@26.56GBaud

Pin Description

Pin	Symbol	Description	Notes
1	GND	Ground
2	Tx2n	Transmitter Inverted Data Input
3	Tx2p	Transmitter Non Inverted Data Input
4	GND	Ground
5	Tx4n	Transmitter Inverted Data Input
6	Tx4p	Transmitter Non Inverted Data Input
7	GND	Ground
8	ModselL	Module Select
9	ResetL	Module Reset
10	VCC Rx	Receiver +3.3V DC Power Supply
11	SCL	I2C Serial Clock
12	SDA	I2C Serial Data
13	GND	Ground
14	Rx3p	Receiver Non Inverted Differential Output
15	Rx3n	Receiver Inverted Differential Output
16	GND	Ground
17	Rx1p	Receiver Non Inverted Differential Output
18	Rx1n	Receiver Inverted Differential Output
19	GND	Ground
20	GND	Ground
21	Rx2n	Receiver Inverted Differential Output
22	Rx2p	Receiver Non Inverted Differential Output
23	GND	Ground
24	Rx4n	Receiver Inverted Differential Output
25	Rx4p	Receiver Non Inverted Differential Output
26	GND	Ground
27	ModPrsL	Module Present
28	IntL	Interrupt
29	VCC Tx	Transmitter +3.3V DC Power Supply
30	VCC 1	+3.3V DC Power Supply
31	Init Mode	Initialization Mode
32	GND	Ground
33	Tx3p	Transmitter Non Inverted Data Input
34	Tx3n	Transmitter Inverted Data Input
35	GND	Ground
36	Tx1p	Transmitter Non Inverted Data Input
37	Tx1n	Transmitter Inverted Data Input
38	GND	Ground
39	GND	Ground
40	Tx6n	Transmitter Inverted Data Input

41	Tx6p	Transmitter Non Inverted Data Input
42	GND	Ground
43	Tx8n	Transmitter Inverted Data Input
44	Tx8p	Transmitter Non Inverted Data Input
45	GND	Ground
46	Reserved	No connect
47	NC	No connect
48	VCC Rx1	+3.3V DC Power Supply
49	NC	No connect
50	NC	No connect
51	GND	Ground
52	Rx7p	Receiver Non Inverted Differential Output
53	Rx7n	Receiver Inverted Differential Output
54	GND	Ground
55	Rx5p	Receiver Non Inverted Differential Output
56	Rx5n	Receiver Inverted Differential Output
57	GND	Ground
58	GND	Ground
59	Rx6n	Receiver Inverted Differential Output
60	Rx6p	Receiver Non Inverted Differential Output
61	GND	Ground
62	Rx8n	Receiver Inverted Differential Output
63	Rx8p	Receiver Non Inverted Differential Output
64	GND	Ground
65	NC	No Connect
66	Reserved	No Connect
67	VCCTx1	+3.3V DC Power Supply
68	VCC2	+3.3V DC Power Supply
69	Reserved	No Connect
70	GND	Ground
71	Tx7p	Transmitter Non Inverted Data Input
72	Tx7n	Transmitter Inverted Data Input
73	GND	Ground
74	Tx5p	Transmitter Non Inverted Data Input
75	Tx5n	Transmitter Inverted Data Input
76	GND	Ground