ADC in ATmega8

Max is about 15 Ksps. The max sample-clock rate is 200 KHz at full
resolution and each conversion requires 13 sample clocks.

Given that the ATmega8 tops out at 16 MHz, trying to handle a 5 Msps
ADC directly might be rather ambitious.

Would you like to give me any suggestions? What we are planning is that
we will use an adc to sample out the analog signal and then stored into
the memory of the microcontroller. It will then sent to the processor
for display on the screen using VGA programming. Everything is working
fine but we searching for the ADC. Any idea to work this out?
Regards

[Please include context when replying. Google != usenet]



I'd start with Digikey, Mouser, and Newark to see what's actually
available to buy. From Digikey, assuming that 10 bits is enough (based
on your suggestion that the ADC in the ATmega8 was sufficient but slow)
and that you need at least 5 Msps then the answer is: TI's THS10082IDA.

An AVR is a nice processor but it's not really designed to sling data
around at that rate, certainly not on its own. A supporting CPLD or
small FPGA may give you enough throughput. Otherwise, I'd look at one of
the ARM-core processors.