LMK61A2-156M: Spread Spectrum OSC for LVDS

Roy Chou1

Genius 12565 points

Part Number: LMK61A2-156M
Other Parts Discussed in Thread: CDCE913, CDCE6214, CDCE6214-Q1

Hi team,

Do we have 75MHz OSC for output LVDS level with spread spectrum?

Roy

over 3 years ago

0 Hao Z over 3 years ago

TI__Mastermind 18070 points

Hi Roy,

You can probably use a clock generator instead. There're CDCE913 and CDCE6214. Both of them support LVDS with SSC.

Regards,
Hao

0 Roy Chou1 over 3 years ago in reply to Hao Z

TI__Genius 12565 points

Hi Team,

We try to use CDCE6214-Q1.

Could you let me know if this device use both LVDS CLK and SSC?

I couldn't find related setting in datasheet.

Roy

0 Hao Z over 3 years ago in reply to Roy Chou1

TI__Mastermind 18070 points

Hi Roy,

Yes it supports both LVDS output and SSC.

Regards,
Hao

0 Roy Chou1 over 3 years ago in reply to Hao Z

TI__Genius 12565 points

Hi Hao,

Could you let us know the content in datasheet, I only find SSC in PCIe part.

Roy

0 Hao Z over 3 years ago in reply to Roy Chou1

TI__Mastermind 18070 points

Hi Roy,

Please see below:

Regards,

Hao

0 Hao Z over 3 years ago in reply to Hao Z

TI__Mastermind 18070 points

Hi Roy,

Maybe I misunderstood. Please note that you'll need to program the part through I2C in order to get LVDS outputs with SSC.

Regards,
Hao

0 Roy Chou1 over 3 years ago in reply to Hao Z

TI__Genius 12565 points

Hi Hao,

1. My customer would like to operate in LVDS clk = 75MHz. Do I need connect the crystal on PRIREF or SECREF? If I need, how could I choose the value?

2. Could I set VDD_REF / VDD_VCO / VDDO_12 / VDDO_34 = 3.3V? (LVDS = 75MHz which has SSC)

Thank you.

Regards,

Roy

0 Hao Z over 3 years ago in reply to Roy Chou1

TI__Mastermind 18070 points

Hi Roy,

SECREF is the input for crystal. A regular 25MHz crystal will work. And yes you can set all VDD pins to 3.3V.

Regards,
Hao

Clock & timing

Clock & timing forum

LMK61A2-156M: Spread Spectrum OSC for LVDS