High speed ADC with USB interface

I'm looking for 12-16bit ADC with 4MHz samplingrate capable of storing 4K
samples, with USB interface to transfer data to a PC.

Any recommendation ?

 

[Ulf Samuelsson]

<adc> skrev i meddelandet
news:41f3934e$0$803$afc38c87@news.optusnet.com.au...

I'm looking for 12-16bit ADC with 4MHz samplingrate capable of storing 4K
samples, with USB interface to transfer data to a PC.

I doubt that you will find this ADC/USB/Storage on a single chip.
With 4 Mhz sample rate and 12 ´bit resolution
you need 48 MHz operation for a serial interface
so it is likely you need a parallell interface.

I assume you store the samples first and then send it over USB.
Then you need 8 kB of storage for the samples.
Is it acceptable to use a UART at 115 kbps which connects to a USB-Serial
bridge?
You can transfer 4kW in about 1 second?

You would be looking for a micro with
* DMA capability for 4 Mtransfer/s
* 16 bit Bus
* 8 kB extra SRAM (16 kB min)
* USB interface, or connection to an external UART-USB bridge
* External ADC

Any recommendation ?

The AT94K05 FPSLIC has enough RAM and can directly interface to
the ADC using the FPGA area, but lacks the USB.

 

[Ian Stirling]

In sci.electronics.design Ulf Samuelsson <ulf@a-t-m-e-l.com> wrote:

adc> skrev i meddelandet
news:41f3934e$0$803$afc38c87@news.optusnet.com.au...
I'm looking for 12-16bit ADC with 4MHz samplingrate capable of storing 4K
samples, with USB interface to transfer data to a PC.


I doubt that you will find this ADC/USB/Storage on a single chip.
With 4 Mhz sample rate and 12 ?bit resolution
you need 48 MHz operation for a serial interface
so it is likely you need a parallell interface.

That's only 6 megabytes/second.
USB2 can easily do this.
I however also doubt you'll find a single chip.

 

[Mike]

In article <35hpv6F4303qkU2@individual.net>, ulf@a-t-m-e-l.com says...

You can transfer 4kW in about 1 second?

WoW now that would be something for sure - geeeesh as I ponder
the frailties of using a 60KVA 3-phase UPS as a paperweight !


--
Regards
Mike
VL Commodore, Calais VL Turbo FuseRail that wont warp or melt !
http://niche.iinet.net.au

 

My appologies.!.. Altough I said ADC, what actually I mean an ADC board, not
necessary single chip.

My corrected question is;

I'm looking for 12-16bit ADC Board with 4MHz sampling rate capable of
storing 4K samples, with USB interface to transfer data to a PC.

I'm looking for 12-16bit ADC with 4MHz samplingrate capable of storing 4K
samples, with USB interface to transfer data to a PC.

 

[Antti Keskinen]

<adc> wrote in message news:41f4bb86$0$2672$afc38c87@news.optusnet.com.au...

My appologies.!.. Altough I said ADC, what actually I mean an ADC board,
not necessary single chip.

My corrected question is;

I'm looking for 12-16bit ADC Board with 4MHz sampling rate capable of
storing 4K samples, with USB interface to transfer data to a PC.

A 12-16 bit ADC with 4 Mhz sampling rate requires a minimum throughput of 48
Mb/s, and a maximum of 64 Mb/s. This means you must have a Hi-Speed USB 2.0
IC, which is capable of the theoretical maximum of 480 Mb/s.

One candidate is SMSC's GT3200. It has a 16-bit parallel interface, thus it
is possible to interface it with any modern microprocessor. For the ADC
unit, I'd look at Analog Device's ADC selection matrix. They have at least a
16-bit 65 MSPS (Million samples per second) device and a 16-bit 3 MSPS
device. If your sampling rate of 4 Mhz is absolute, the 65 MSPS is the
nearest suitable 16-bit one. The interface is parallel, thus it would be
directly compatible with the GT3200.

If a lower sampling accuracy is enough, AD also offers a 12-bit and 14-bit
10 MSPS devices, both with parallel interface. The upper 4(2) bits of the
USB unit could be used for signalling, if necessary.

I have only experience with the AD's ADC units, and they've been positive
experiences. Dunno about the GT3200, but you could try checking them out.

-Antti Keskinen

 

[Ulf Samuelsson]

My corrected question is;

I'm looking for 12-16bit ADC Board with 4MHz sampling rate capable of
storing 4K samples, with USB interface to transfer data to a PC.



A 12-16 bit ADC with 4 Mhz sampling rate requires a minimum throughput of
48
Mb/s, and a maximum of 64 Mb/s. This means you must have a Hi-Speed USB
2.0
IC, which is capable of the theoretical maximum of 480 Mb/s.

If the board needs/has a sample buffer, then there is no need for the high

speed.
You get 4k samples and then upload it over 12 mbps USB at leasure.


/Ulf

-Antti Keskinen