Least expensive USB 16 bit or higher adc device with periodic timed conversions

[Steve]

I'm looking for an < $100 USB analog to digital converter device with
16 or more bits of voltage resolution that provides its digitized data
to computer at periodic timed intervals. My fastest rate would be 10
Hz. One channel is enough, +/- 1 volt input range is ok.

A hardware clocked device, perhaps with some small on-board memory
buffer would be ideal. This would avoid the missed sample periods
that can result from software timed clocked schemes that are subject
to missed periods when other large application are opened, the user
drags a scrolbar around, etc. There are several inexpensive
delta-sigma adc's available for example. Does say a microcontroller
design exist which incorporates a hardware clock to provide periodic
timed conversions ? Software dll, ActiveX, or LabVIEW driver needed.

 

[Joerg]

Hello Steve,

I'm looking for an < $100 USB analog to digital converter device with
16 or more bits of voltage resolution that provides its digitized data
to computer at periodic timed intervals. My fastest rate would be 10
Hz. One channel is enough, +/- 1 volt input range is ok.

A hardware clocked device, perhaps with some small on-board memory
buffer would be ideal. This would avoid the missed sample periods
that can result from software timed clocked schemes that are subject
to missed periods when other large application are opened, the user
drags a scrolbar around, etc. There are several inexpensive
delta-sigma adc's available for example. Does say a microcontroller
design exist which incorporates a hardware clock to provide periodic
timed conversions ? Software dll, ActiveX, or LabVIEW driver needed.

Had just come up in another thread: You might consider the TI EZ430 kit.
$20, uC is the MSP430F2013 with 16 bit converter, comes with code
examples. I don't know about how easy it is to use the USB port without
the IAR debugger though.