LMX2592: VCO cores for Lmx2592

Izik

Expert 1585 points

Part Number: LMX2592
Other Parts Discussed in Thread: LMX2594

Hello

Can you please send a table that specifies the frequency range of each vco core covers?

Please explain also if the capacitor change will generate linear and constant change over frequency when using one core

Thanks

over 8 years ago

0 Izik over 8 years ago

Expert 1585 points

Hello friends

Any updates?

0 Timothy T over 8 years ago in reply to Izik

TI__Mastermind 28550 points

Hello,

I've notified an engineer to respond.

0 Izik over 8 years ago in reply to Timothy T

Expert 1585 points

Hello

Please advise if you have new information

thanks

0 Brian Wang over 8 years ago in reply to Izik

TI__Expert 8505 points

Izik,

The ranges are approx.:

VCO1: 3500 – 4100
VCO2: 4000 – 4500
VCO3: 4400 – 5000
VCO4: 4900 – 5500
VCO5: 5400 – 6000
VCO6: 5900 – 6600
VCO7: 6500 – 7100

As you go from one end of the VCO (lowest frequency) to other end (highest frequency) the change per capcode decreases in frequency step in a linear manner.

0 Izik over 8 years ago in reply to Brian Wang

Expert 1585 points

Hi Brian,
Thank you for your reply.
Can I ask you to send a full LMX2592 VCO Core Ranges information, like it is done in LMX2594 datasheet, Table 6?
I need the CCORE and ACORE (min/max) values related to each LMX2592 VCO range.
I intend to perform manual VCO calibration and this info is very important!
Thanks!

0 Nir Flysher over 8 years ago in reply to Izik

TI__Expert 3367 points

Dear Team,

Just to elaborate more about what we want to do.
We intend to calibrate the VCO values in advance and keep them in a lookup table in order to enable fast freq switching.
Can you please advise which registers we should read/write and any additional information we might need to do this ?
We've noticed that the CCORE and ACORE values don't change after calibration. Any idea why ?

Best regards,
Nir.

0 Dean Banerjee over 8 years ago in reply to Nir Flysher

TI__Mastermind 28011 points

Nir,

I don't have all this information, but here is what hte PLLatinum Sim database has

VCO1:

0 Dean Banerjee over 8 years ago in reply to Dean Banerjee

TI__Mastermind 28011 points

Nir,

Let me follow up offline.

0 Izik over 8 years ago in reply to Dean Banerjee

Expert 1585 points

Hi Dean

Your message seems to be incomplete

Thanks

0 Dean Banerjee over 8 years ago in reply to Izik

TI__Mastermind 28011 points

I tried to paste something and it didn't work.
Here is a table for the CapCTRL, but for AMPCAL, we don't have this information. Typically this is set between 300 and 400.

Fmin Fmax CapMin CapMax KvcoMin KvcoMax
VCO1 3550 4070 169 23 22 37
VCO2 4070 4530 157 15 24 40
VCO3 4530 5010 168 25 26 43
VCO4 5010 5570 160 7 30 43
VCO5 5570 6060 172 12 37 48
VCO6 6060 6590 173 13 41 54
VCO7 6590 7100 172 15 47 58

Regards,
Dean

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LMX2592: VCO cores for Lmx2592