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Yre you sure, that the ADC actually needs 5V input level? Many devices have TTL-compatible inputs, that can be controlled by 3.3V LVTTL as well.
If you actually need a level conversion, any 74HCT or AHCT logic with 5V supply can do. DE2 GPIO pins have RD networks and can work with 5V logic level. The current load to the driving logic may be too high. Adding a 470 ohm to 1k series resistor near the DE2 board should give good waveforms without overloading the driver. A 5V tolerant 3.3V logic gate, e.g. from 74LVC family would be the optimal solution for 5V to 3.3V level translation.
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Well, if you ask me why i so sure that ADC need 5V input level, because i tested the interface without the translator but i fail to obtain any result. Well, of course i asked my lecturer for this matter and he told me the need to use the translator.I am using ADC: ADS7861. I tried to use TXS0108E level translator from texas instrument but it is so sensitive and attached lot of noise. Then i realised by reading other post that the TXS is for short trance and without cable while i use jumpers for the connection.
Well, i have ordered the SN74LVC244A from texas Instrument thru farnell. It take few days for my order arrival. Is this translator apply to my design, for the 1MHz?
I tried to use op amp as comparator to form this translator but it fail. It should work theoretically.
Actually i am quite rush as i need to submit this before 10/4. After confirming functionality of this hardware, i still need to test my software. I hope you can reply me as soon as you read this. Thanks a lot.
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