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Adventurer
Adventurer
9,365 Views
Registered: ‎05-27-2011

1.8V VCCO (1.8V CMOS and 1.8VLVDS)

 

Hi All.

I'm sat here reading through UG381. Our application interfaces a Spartan 6 LX45 to an Analogue Devices ADC. 

 

We therefore have 1.8V LVDS input, but also need 1.8V LVCMOS for the ADCs SPI.

 

If I set VCCO to 1.8V, table 1-5 states we can get LVCMOS1V8 operation both input and output. However I can't see anything on 1.8V LVDS input (only the 2.5V and 3.3V variants).

 

My question is: Are there any restrictions on VCCAUX (which from Table 1-6, I imaging should also be connected to 1.8V). 

 

The other banks are either set to 2.5V or 3.3V LVCMOS I/O only so VCCAUX shouldn't be a problem for them right?

 

Thanks.

ED

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Adventurer
Adventurer
9,359 Views
Registered: ‎05-27-2011

From DS162 Table 2, it looks like 2.5V minimum for VCCAUX.

 

As such how should we go about getting a suitable mid rail bias voltage for LVDS1.8V?

 

Thanks.

Ed

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Moderator
Moderator
9,337 Views
Registered: ‎01-15-2008

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