LM98640 Digital I/O Voltage

Simon Guan

I am working on a circuit board using LM98640 to interface an FPGA. The datasheet specifies digital supply voltage of 1.8V, but Electrical Characteristics table shows that VIH and VOH min is 2.0V and 1.8V, respectively. Based on the Electrical Characteristics table, the I/O voltage (digital) can't be 1.8V. I suspect it should be 3.3V, but I guess my question is: what FPGA I/Os (1.8V or 3.3V) should the LM98640 interface to?

Thanks in advance for any insight/clarification.

-Simon

over 7 years ago

0 Praveen Aroul over 7 years ago

TI__Mastermind 49176 points

Hi Simon,

I am moving your post here to the Imaging forum that covers the device LM98640. I'm sure you'll find an answer here.

0 Kirby Kruckmeyer96848 over 7 years ago

TI__Genius 17035 points

Hello Simon,

The LVDS output runs off of the 1.8V drive. The rest of the part runs off of the 3.3V supply. The Vih and Voh are for the SPI and not for the LVDS output. Please see the LVDS Output table for the LVDS specifications.

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LM98640 Digital I/O Voltage