HSDS and LCPECL

toshi-e2e

Genius 4830 points

Other Parts Discussed in Thread: LMK04828

Hi All,

Does anyone know the merit and demerit about HSDS and LCPECL interface?

Regards,
Toshi

over 10 years ago

0 Arvind Sridhar over 10 years ago

TI__Mastermind 24205 points

Hi Toshi-San,

We recommend LCPECL be selected as the interface standard while DC coupling the outputs from our device to a receiver that has a low common mode voltage specification (example Vcm of receiver = 0.5V)

DC coupled HSDS (8mA) has a common mode of ~1.66V

HSDS (8mA) is closest to LCPECL in terms of output signal amplitude -> ~800mV (typical)

HSDS (8mA) driver consumes around 11.0mA of current while LCPECL (240 ohm emitter Resistor) consumes 17mA

Noise Floor and Integrated Jitter comparison between the two output standards are documnted in the electrical performance tables on the LMK04828 datasheet.

Regards

Arvind Sridhar

0 toshi-e2e over 10 years ago in reply to Arvind Sridhar

Genius 4830 points

Hi Arvind-san,

Thanks for your reply.

Is there any material for more understanding HSDS and LCPECL interface specification?

Regards,
Toshi

0 Arvind Sridhar over 10 years ago in reply to toshi-e2e

TI__Mastermind 24205 points

Hi Toshi-San,

Please see attachment.

7510.LMK04828_Driver_Termination.pptx

Regards

Arvind Sridhar

0 toshi-e2e over 10 years ago in reply to Arvind Sridhar

Genius 4830 points

Hi Arvind-san,

Thanks for providing the material. This is very useful for understanding the HSDS and LCPECL specification and termination.
However this material is stated as the NDA information.
Could you please delete the statement of NDA?

Thanks and regards,
Toshi

Clock & timing

Clock & timing forum

HSDS and LCPECL