ADC0809 with cyclone III

[Altera_Forum]

Hello Guys, 

 I am familiar with ADC0809, 0804 chips with 8051 controllers.  Similarly i want to try on Cyclone III device.Can it be done?  Or i need to change the ADC Chip.  For your info my board is custom made.  Regards Kiran

[Altera_Forum]

Hi, 

 There is no problem to connect ADC with FPGA, only the interface pins of ADC should match with FPGA I/O Levels.  -- Regards, Chander

[Altera_Forum]

Ya. i understood. So in this i cant use ADC0809(IO levels are 5V) Can you suggest me IO levels of 2.5-3.3V  

 Regards Kiran

[Altera_Forum]

You Can use Level Translator 5v to 3.3v. 

 Just see this part no. SN74LVC4245ADW

[Altera_Forum]

Ya thanks dude. You solved my major problem.But ADC0804 has 8 data lines and 3 control lines.(RD,WR,INTR). So i need to use one more LVC4245. Or is there any more no.of data lines available chip. 

 regards Kiran

[Altera_Forum]

SN74LVC4245ADW has 8-bit bidirectional transceiver bus. For select line you have to use another. As ADC select line will be output from FPGA, but 8-bit output Bus of ADC will be Input to FPGA.

[Altera_Forum]

--- Quote Start ---  SN74LVC4245ADW has 8-bit bidirectional transceiver bus. For select line you have to use another. As ADC select line will be output from FPGA, but 8-bit output Bus of ADC will be Input to FPGA.  --- Quote End ---    No. INTR pin is the input to FPGA. So this pin i need to take care. For One pin i dont think so of using one more IC.