12 VDC+11.4+12+12.6V
3.3 VDC+3.14+3.3+3.46V
VADJ (1.2VDC)+1.14+1.2+1.26V
VADJ (1.5VDC)+1.425+1.5+1.575V
VADJ (1.8VDC)+1.71+1.8+1.89V
VADJ (2.5VDC)+2.375+2.5+2.625V
VADJ (3.3VDC)+3.135+3.3+3.465V


  • All VADJ pins must be supplied with the same voltage chosen from one of the following levels: +1.2VDC, +1.5VDC, +1.8VDC, +2.5VDC, +3.3VDC. Note that many carriers have a system controller that will make this choice for you.

Power Consumption

The power consumption of the Quad SFP28 FMC will depend heavily on the SFP+/SFP28 modules being used and the load they are being put under. Power consumption measurements will be added to this section in the near future.

Thermal Information

We have not performed comprehensive thermal testing on the Quad SFP28 FMC, however we recommend that it be operated under ambient temperatures between -40 and 85 degrees C. This advice is based on the recommended ambient operating temperatures of a basket of SFP+/SFP28 modules currently on the market. The active devices on the mezzanine card itself have operating ranges that match or exceed those of typical SFP+/SFP28 modules and are listed in the table below.

TI, 5A Synchronous Buck Converter, TPS565247DRLR-40150C
TI, I2C Level translator, TCA9416DTMR-40125C
ST, 2K EEPROM, M24C02-FDW6TP-4085C
Skyworks, SyncE Jitter-Attenuating Clock Multiplier, SI5328B-C-GM-4085C
TI, 8-channel I2C Switch with Reset, PCA9548ARGER-4085C
TI, Voltage Translator, SN74AVC4T245RSVR-4085C
Abracon, 114.285MHz Crystal, ABM8-166-114.285MHZ-T2-4085C

Components that are not listed in the table above (such as resistors, capacitors) are selected to have minimum operating temperature that is lower than -40 degrees C, and maximum operating temperature that is greater than 85 degrees C.

I2C (EEPROM) Timing

The serial EEPROM (part number ST, 2K EEPROM, M24C02-FDW6TP ) has a maximum operating clock frequency of 400 kHz (Fast-mode).

I2C (PL) Timing

The PL I2C bus passes through level translator ( TCA9416 ) and I2C switch ( PCA9548 ). Together they support an I2C clock frequency up to 400kHz (Fast-mode).

DeviceStandard-mode 100kHzFast-mode 400kHzFast-mode Plus 1MHz
Level translator TCA9416✔️✔️✔️
Switch PCA9548✔️✔️


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