Can transmit 20Mbps LVDS signal over 200 meters long using CLC001+CLC014?

huang yu

Other Parts Discussed in Thread: CLC001, LMH0074, SN65HVD78, THVD1450, DS90LV011A, DS90LT012A, DS30BA101, DS30EA101

Hello everyone, I want to transmit 20Mbps LVDS signal over 200 meters long. I originally wanted to use CLC001+CLC014, but the CLC014 receiving frequency range is 50~650Mbps, which does not meet the frequency requirements. Is there a reasonable solution? I look forward to your reply. ,Thank you!

over 6 years ago

0 Clemens Ladisch over 6 years ago

Guru 282680 points

As far as I can see, the CLC014 is no longer sold. (Replacements like the LMH0074 also have a minimum frequency, because they are designed for SMPTE.)

Consider increasing the frequency (e.g., times eight) by XORing the signal with a 80 MHz clock, or some other encoding.

There is an older application report, Comparing Bus Solutions (SLLA067). Have a look at figure 1:

So for 20 Mbps over 200 m, I'd think of RS-422/RS-485.

However, this combination of speed and distance might go beyond the physical limits; the THVD1450/SN65HVD78 datasheets say (200 m ≈ 650 ft):

And RS-485 transceiver chips use single-ended signals; to convert from/to LVDS, you need to add receivers/transmitters like the DS90LT012A/DS90LV011A.

0 Nasser Mohammadi over 6 years ago in reply to Clemens Ladisch

TI__Guru* 93670 points

Greetings,

DS30BA101 and DS30EA101 could be used in this application. However, these devices have not been characterized at 20Mbps and thus data sheet specs cannot be guaranteed. Having said these, these device can operate at this low rates.

Regards,,nasser