Analog to digital converter confustion

[EricVanWyk]

Originally Posted by Kevin Sevcik

Unfortunately, that's a pretty extreme specification and I don't think you're likely to find anything that will meet both of those at the same time. You'll probably have to relax one of those requirements to get a chip you can work with. If you really absolutely have to measure signals in the 10MHz range for some reason, then I think your best bet is to run your signal through a high bandwidth op-amp first with a gain of .5 or some such so you can look for ADCs with a smaller input range. I'm pretty certain that even switching to a DSP won't help, as the faster DSPs tend to need 3.33V supplies or less.

I have to respectfully disagree with you here Kevin. I have found the following 20MSPS 5V parts in 15 minutes of searching.

AD9280 8bit 32MSPS 2.7V-5.5V $2.15
AD9200 10bit 20MSPS 2.7V-5.5V $2.50
AD876 10bit 20MSPS 4.5V-5.25V $3.31
Analog

TI
has a few more.

As does Linear
Bits Speed ADCs S/H SINAD Power Supply Voltage Range Packages
LTC1406 8 20 1 1 48.5 150 5V SSOP-24
LTC1741 12 65 1 1 72 1,275 5V TSSOP-48
LTC1742 14 65 1 1 76.2 1,275 5V TSSOP-48
LTC1743 12 50 1 1 72.2 1,000 5V TSSOP-48
LTC1744 14 50 1 1 76 1,200 5V TSSOP-48
LTC1745 12 25 1 1 72.5 380 5V TSSOP-48
LTC1746 14 25 1 1 77.5 390 5V TSSOP-48
LTC1747 12 80 1 1 72 1,400 5V TSSOP-48
LTC1748 14 80 1 1 76 1,400 5V TSSOP-48
LTC1749 12 80 1 1 71.7 1,450 5V TSSOP-48
LTC1750 14 80 1 1 75.2 1,450 5V TSSOP-48