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How to choose 24bit 50/100KHz ADC for MSP430?

Started by eeman June 17, 2008
hi all,

I want to use a high-resolution A/D application.
but the module in MSP430 is not enough. (ADC12 or SD16)
So I try to find some ADC.
In TI website, 20+ bit with 50 or 100KHz ADC is not too much.

Like ADS1271, the clock needs 27MHz.
I have no idea how to generate this clock from MSP430 for ADS1271.

Have someone knows which ADC is suitable for use with MSP430F169.

Best regards,

eeman

Beginning Microcontrollers with the MSP430

IMHO, may be you cannot avoid to use external such 27 MHz crystal clock source. This because of the High-Resolution ADC with Delta-Sigma Architecture that need clock source for oversampling to archive 50/100kPSP. Correct me if I'm wrong.

--- On Tue, 6/17/08, eeman <p...@ccmail.ncku.edu.tw> wrote:
From: eeman <p...@ccmail.ncku.edu.tw>
Subject: [msp430] How to choose 24bit 50/100KHz ADC for MSP430?
To: m...
Date: Tuesday, June 17, 2008, 1:00 AM

hi all,

I want to use a high-resolution A/D application.

but the module in MSP430 is not enough. (ADC12 or SD16)

So I try to find some ADC.

In TI website, 20+ bit with 50 or 100KHz ADC is not too much.

Like ADS1271, the clock needs 27MHz.

I have no idea how to generate this clock from MSP430 for ADS1271.

Have someone knows which ADC is suitable for use with MSP430F169.

Best regards,

eeman


The ADS1271 looks okay, but should you really be looking at a high
resolution ADC without even understanding how to select one, or that you
can't get 27MHz from the MSP430? There is a lot more to high resolution
data conversion than simply shoving a high resolution ADC into the
circuit. Do you understand the layout requirements, power supply
requirements etc, since you haven't grasped the clock requirements yet?
I suggest that you read as much on this subjec as you can before you
decide that you need suc high resolution, and before you attempt any
harware or PCB design. You will also need to generate a 5V supply for
this part.

Al

eeman wrote:

>hi all,
>
>I want to use a high-resolution A/D application.
>but the module in MSP430 is not enough. (ADC12 or SD16)
>So I try to find some ADC.
>In TI website, 20+ bit with 50 or 100KHz ADC is not too much.
>
>Like ADS1271, the clock needs 27MHz.
>I have no idea how to generate this clock from MSP430 for ADS1271.
>
>Have someone knows which ADC is suitable for use with MSP430F169.
>
>Best regards,
>
>eeman
>