AM26LV31E/32E / transmission distance

Toshiyuki

Mastermind 7075 points

Hi,

Our customer has a question.

Could they use in data rate 20MHz & transmission distance 100 meters?

And could it be assured?

Best Regards,

Kato

over 11 years ago

0 Ron Michallick over 11 years ago

TI__Guru**** 164926 points

Toshiyuki,

A rule of thumb states that the product of the line length [ft] times the data rate [Mbps] < 2000.
From figure 6 in http://e2e.ti.com/support/interface/industrial_interface/m/videos__files/264978/download.aspx

100[ft] * 40[Mbps] = 4000

Data integrity will be a concern. If the environment is noisy then even a product of 2000[Mbps*ft] could be a problem.

0 Toshiyuki over 11 years ago in reply to Ron Michallick

Mastermind 7075 points

Michallick - san,

Thank you for the reply.

I understood that the line length[ft] times the data rate[Mbps] must be < 2000.

When our custmer's system is 40Mbps,does the length have to be < 50[ft]?

When the data rate is 64Mbps(the data sheet is described "Switching Rates up to 32MHz"),

does the length have to be < 31.25[ft]?

On the other hand,

I could get the data of transmission characteristics in Japanese E2E.

(AM26LV31-32 transmission characteristics /point to point,VCC=3.3V,Ta=25℃,Rt=100Ω)

1667.EIARS-422_AM26.pdf

Please let me know if our customer could use in the data rate 40[Mbps] & 300[ft]/100[m].

Best Regards,

Kato

0 Toshiyuki over 11 years ago in reply to Toshiyuki

Mastermind 7075 points

Hi,

I post E2E before, but I haven't got your answer yet.

I'm looking forward to hearing from you.

Best Regards,

Kato

0 Ron Michallick over 11 years ago in reply to Toshiyuki

TI__Guru**** 164926 points

Kato-san,

Thank you for the reminder.
The formula and chart are not hard limits that cannot be exceeded. 40Mbps and 30m(100ft) is possible. However exceeding the suggested limits will result in more noise sensitivity, a short valid bit time window. Therefore, careful attention to system testing is recommended. Data stream error checking and correction should be robust.

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AM26LV31E/32E / transmission distance