SN65LVDS387EVM: 16-Channel LVDS driver

Lorenzo Reyes

Part Number: SN65LVDS387EVM

Hi,

I wanted to test the 16-Channel LVDS driver and decided to do it with a 16-Channel LVDS receiver. The goal was basically to see if the driver was converting from LVTTL to LVDS, and to see if the receiver was converting from LVDS back to LVTTL. Now, the signal didn't even went through. I measured the output pins from the driver and didn't get a signal so basically the test from the driver was unsuccessful. At first, I thought that the enable pin, P2-1, was at low-state but it was actually measured at 3.3V, resulting to be at a high-state, meaning that theoretically the chip should be working fine. I reviewed the pinout configuration so I'm sure that I'm connecting the LVTTL signal in the correct pin, P2-4.

At this point we're concluding that the chip appears to be damaged. If there any suggestion or if you think I'm doing something wrong, please let me know.

--Lorenzo

over 5 years ago

0 David (ASIC) Liu over 5 years ago

TI__Guru**** 157336 points

Lorenzo

On the EVM, please make sure the jumper on JMP3 is installed to VCC so section C is enabled. P2-1 is not the enable pin, but P2-9 is the enable pin for section C.

On the input side, please make sure the LVTTL signal levels being provided to the EVM have a VIH of 2 Vdc minimum.

On the output, 100-Ω termination resistors can be added to the scope probe, or individual 100-Ω termination resistors can be installed on the board (backside of the SN65LVDS387EVM) at R1 through R16. The scope termination is recommended for high-signaling rates to eliminate the stub effects caused by the PWB traces running to the P3 connector.

Thanks

David

0 Lorenzo Reyes over 5 years ago in reply to David (ASIC) Liu

Prodigy 40 points

David

All short jumpers JMP1-JMP4 are connected on both the receiver and the driver, otherwise the enable pin would measure 0V. I'm using section A and according to the datasheet, the enable pin for section A is P2-1. I connected a 100Ω termination resistor to the scope probe but still no result.

Also, the LVTTL signal level is 3.3V.

--Lorenzo

0 David (ASIC) Liu over 5 years ago in reply to Lorenzo Reyes

TI__Guru**** 157336 points

Lorenzo

The attached .pdf does not work, would you please attach the file again.

Here is the link to the EVM user manual, which input are you using right now?

http://www.mouser.com/ds/2/405/sllu013-124828.pdf

Thanks

David

0 David (ASIC) Liu over 5 years ago in reply to David (ASIC) Liu

TI__Guru**** 157336 points

Lorenzo

Did you get the issue resolved on the EVM?

Thanks

David

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SN65LVDS387EVM: 16-Channel LVDS driver