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'[EE]: Wanted CHEAPEST serial A2D'
2000\11\09@210636 by Russell McMahon

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I'm looking for the cheapest possible serial A2D to add to a processor (non
PIC :-) ) that otherwise suits my needs but has no A2D.
One or several channel versions would be of interest.

Examples of what I am aware of include the 2 wire serial TLC54X series at
down to $US1ish in 1000's and the TLC0834 I2C 4 channel (and its 2 and 1
channel variants) at about $US1.20 for the 4 channel version.

There may be something even cheaper that I am unaware of.
Onboard reference would be nice but not essential.
Sample and Hold the same.
Accuracy of 8 bits is OK and even less is potentially tolerable.

Any suggestions?





     Russell McMahon
_____________________________

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2000\11\09@211458 by Scott Dattalo

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flavicon
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On Fri, 10 Nov 2000, Russell McMahon wrote:

> I'm looking for the cheapest possible serial A2D to add to a processor (non
> PIC :-) ) that otherwise suits my needs but has no A2D.
> One or several channel versions would be of interest.
>
> Examples of what I am aware of include the 2 wire serial TLC54X series at
> down to $US1ish in 1000's and the TLC0834 I2C 4 channel (and its 2 and 1
> channel variants) at about $US1.20 for the 4 channel version.
>
> There may be something even cheaper that I am unaware of.
> Onboard reference would be nice but not essential.
> Sample and Hold the same.
> Accuracy of 8 bits is OK and even less is potentially tolerable.
>
> Any suggestions?

A 12c508, 8 resistors, and 4 capacitors will give you a 4 channel A/D converter
with 8-bits of resolution and still have two pins left over for I2C. Since you
didn't mention sampling rate, I assume that's not an issue. Unfortunately, this
is a non-non-pic solution.

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2000\11\09@212316 by David VanHorn

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>There may be something even cheaper that I am unaware of.
>Onboard reference would be nice but not essential.
>Sample and Hold the same.
>Accuracy of 8 bits is OK and even less is potentially tolerable.

A delta sigma can be built from an HC86 gate and a few components

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2000\11\10@084406 by Olin Lathrop

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face
> I'm looking for the cheapest possible serial A2D to add to a processor
(non
> PIC :-) ) that otherwise suits my needs but has no A2D.
> One or several channel versions would be of interest.
>
> Examples of what I am aware of include the 2 wire serial TLC54X series at
> down to $US1ish in 1000's and the TLC0834 I2C 4 channel (and its 2 and 1
> channel variants) at about $US1.20 for the 4 channel version.
>
> There may be something even cheaper that I am unaware of.
> Onboard reference would be nice but not essential.
> Sample and Hold the same.
> Accuracy of 8 bits is OK and even less is potentially tolerable.
>
> Any suggestions?

Something like a PIC 12C671 with IIC implemented in firwmare I think would
compete with the prices you mention.


*****************************************************************
Olin Lathrop, embedded systems consultant in Devens Massachusetts
(978) 772-3129, spam_OUTolinTakeThisOuTspamcognivis.com, http://www.cognivis.com

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2000\11\10@104955 by Mark Walsh

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face
> I'm looking for the cheapest possible serial A2D to add to a
> processor (non
> PIC :-) ) that otherwise suits my needs but has no A2D.
> One or several channel versions would be of interest.
>
> Examples of what I am aware of include the 2 wire serial TLC54X series at
> down to $US1ish in 1000's and the TLC0834 I2C 4 channel (and its 2 and 1
> channel variants) at about $US1.20 for the 4 channel version.
>
> There may be something even cheaper that I am unaware of.
> Onboard reference would be nice but not essential.
> Sample and Hold the same.
> Accuracy of 8 bits is OK and even less is potentially tolerable.
>
> Any suggestions?
>
>
>       Russell McMahon

We pay about $0.95 for a 2 channel ADC08832 in 1000 qty. SOIC-8.

Mark Walsh

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