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Fastest ADC within Micro

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MB91F267
...
ADC: 4+7 channel converter with 1.2 us conversion time
...

http://www.fme.gsdc.de/products/mb91265s.htm?session=&{int_session_id};&cnt=&{int_session_cnt};
 

Hi

What do you mean by 4+7?

I think 1.2Us conversion time s not too fast.
this gives a a sampling frequency of 833333Hz
I think ARM7 LPC21xx can support up too 5 Mhz sampling rate.

I that True?

Salam
Hossam Alzomor
www.i-g.org
 

>What do you mean by 4+7?

Resolution: 8/10 bit: 4 channels x 1 unit, 7 channels x 1 unit.

Added after 46 minutes:

alzomor said:
I think ARM7 LPC21xx can support up too 5 Mhz sampling rate.
Click to expand...
Hm, ARM7 LPC21xx have converter frequency 5 Mhz. It is not "conversion time".

In doc (LPC213X) write "... more than 400,000 10-bit sample per second... "
and
...
One (LPC2131/32 ) or two (LPC2134/36/38 ) 8 channel 10-bit A/D converters provides a total of up to 16 analog inputs, with conversion times as low as 2.44 us per channel.
...
 

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    alzomor

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The biggest problem with a fast A/D on a processor is having enough processor performance to service the A/D converter and process the data. So you either need a very fast processor or a DMA capability or both!

Analog Devices (www.analog.com) makes some DSP's with 20MSPS converters on chip: ADSP2199x; and a 8051 microprocessor, ADUC812, with a 200kSPS converter.

TI also makes an inexpensive microprocessor family with A/D converters and a DMA controller: MSP430Fxxxx.
 

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    alzomor

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Hossam,

although I like the LPC21xx, the ADC needs 2.something usec and has a max samplerate in the range of 400ksamples/sec as sps pointed out already. All ADCs on the LPC2000 family seem to have the same specification except the number of input channels.
There are 1 MSPS ARM devices with 12-bit ADCs from Analog Devices. You can search for ADuC7022 as an example.
If a DSP is an option there are faster ADCs at a higher price.

Bob
 

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    alzomor

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The ADC of PIC24 series of controllers have a 1.5 MS/sec.
 

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    alzomor

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