On 4/11/2015 7:15 PM, Dimitrij Klingbeil wrote:
On 10.04.2015 06:20, rickman wrote:
On 4/4/2015 3:40 PM, Tim Williams wrote:
"rickman" wrote in message
...
Flash converters are the only choice for anything above around
1-2 MSPS last time I looked hard. Maybe they are pushing towards
10 MSPS with SARS and SD converters. But for anything higher a
flash converter is the only choice.

When did you last look? Two decades ago?

All the ones I've seen (within say 5 years) from about 20 to 500
Msps and 8+ bits are pipelined SAR. Usually with terrible INL for
the higher bits versions, but that reflects their usage: AC
circuits, radio (SDR), ultrasound, etc., where low DNL is
priority.

Often, they're also in a series, so you get like, 65-80-110 Msps
and 10-12-14 bits. Likely they use the same configurable die for
everything in that series, and burn some fuses during test to
implement the highest spec the chip meets.

Can you offer a few part numbers?

Pretty much everything 10(+) bit-ish and high-speed from Analog devices,

like the AD9257 or whatever else that starts with AD92... or AD96...

This is not a pipelined SAR converter. From page 18 of the data sheet...

"Each stage of the pipeline, excluding the last, consists of a low
resolution flash ADC connected to a switched-capacitor DAC and an
interstage residue amplifier"

Pipelined - yes. SAR - no. This is just an extension of the subranging
flash converter I was talking about.

--

Rick