Re: High speed ADC with USB interface

From: Ulf Samuelsson (ulf_at_a-t-m-e-l.com)
Date: 01/23/05 

Date: Sun, 23 Jan 2005 15:05:22 +0100

<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 ībit 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.

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