SFP28 25Gb/s Direct Attached Cable

Part Number

Description

SP28-DP1M30WG

SP28-DP2M30WG

SP28-DP3M30WG

SP28-DP3M30WG

SP28-DP5M26WG

SP28-AP7M26WG

Parameter

Symbol

Typical

Unit

Note

Differential Impedance

TDR

90

100

110

ohms

Insertion loss

SDD21

8

22.48

dB

At 12.8906 GHz

Differential Return Loss

SDD11

SDD22

12.45

dB

At 0.05 to 4.1 GHz

3.12

See 2

dB

At 4.1 to 19 GHz

Common-mode to common-mode output return loss

SCC11

SCC22

2

dB

At 0.2 to 19 GHz

Differential to common-mode

return loss

SCD11

SCD22

12

See 3

dB

At 0.01 to 12.89 GHz

10.58

See 4

At 12.89 to 19 GHz

Differential to common Mode

Conversion Loss

SCD21-IL

10

dB

At 0.01 to 12.89 GHz

At 12.89 to 15.7 GHz

6.3

At 15.7 to 19 GHz

Channel Operating Margin

COM

3

dB

1. Reflection Coefficient given by equation SDD11(dB) < 16.5 - 2 × SQRT(f ), with f in GHz
2. Reflection Coefficient given by equation SDD11(dB) < 10.66 - 14 × log10(f/5.5), with f in GHz
3. Reflection Coefficient given by equation SCD11(dB) < 22 - (20/25.78)*f, with f in GHz
4. Reflection Coefficient given by equation SCD11(dB) < 15 - (6/25.78)*f, with f in GHz
5. Reflection Coefficient given by equation SCD21(dB) < 27 - (29/22)*f, with f in GHz

Logic

Symbol

Name/Description

Notes

1

VeeT

Transmitter Ground

2

LV-TTL-O

TX_Fault

N/A

1

3

LV-TTL-I

TX_DIS

Transmitter Disable

2

4

LV-TTL-I/O

SDA

Tow Wire Serial Data

5

LV-TTL-I

SCL

Tow Wire Serial Clock

6

MOD_DEF0

Module present, connect to VeeT

7

LV-TTL-I

RS0

N/A

1

8

LV-TTL-O

LOS

LOS of Signal

2

9

LV-TTL-I

RS1

N/A

1

10

VeeR

Reciever Ground

11

VeeR

Reciever Ground

12

CML-O

RD-

Reciever Data Inverted

13

CML-O

RD+

Reciever Data Non-Inverted

14

VeeR

Reciever Ground

15

VccR

Reciever Supply 3.3V

16

VccT

Transmitter Supply 3.3V

17

VeeT

Transmitter Ground

18

CML-I

TD+

Transmitter Data Non-Inverted

19

CML_I

TD-

Transmitter Data Inverted

20

VeeT

Transmitter Ground

1.

2.