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Old 12-02-2007, 12:06 PM
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Default Re: Interfacing Cyclone III to 3.3v LVDS devices

On Nov 29, 6:46 am, "[email protected]" <[email protected]> wrote:
> How can i interface the cyclone III with 2.5v LVDS to 3.3v LVDS adc &
> dac ?
>
> Thanks


IMHO directly. I've connected 3.3V Stratix LVDS to 2.5V StratixII LVDS
in both directions.

"The Cyclone III device meets the ANSI/TIA/EIA-644 standard with the
following exceptions:
The maximum voltage output differential (VOD) is increased to 600
mV. The maximum VOD for ANSI specification is 450 mV.
The input voltage range can be reduced to the range of 1.0 V to 1.6
V, 0.5 V to 1.85 V or 0 V to 1.8 V based on different frequency
ranges.
The ANSI/TIA/EIA-644 specification supports an input voltage range of
0V to 2.4V."

See the Cyclone III Device Datasheet: DC and Switching Characteristics
of Cyclone III Devices chapter in volume 2 of the Cyclone III Device
Handbook
for the LVDS I/O standard electrical specifications and check your DAC/
ADC specification for final proof.

Digitally yours,
Michael Tsvetkov

http://www.jpegls.com
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