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I2C ADC

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Moderators: Ajay, Junied , abbas1707, Arun Kumar V, pdi33, Shailesh NAYAK, ۞ TPS ۞, shyam, sashijoseph

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Mon Jun 30 2008, 05:42AM

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hey, hello friends!
wanna help to select 12 bit ADC with I2C bus.
please can any of you suggest me proper ADC which is available in INDIA.
and about programming example for same.

thank you.
free_electron

bharat

Ajay

Mon Jun 30 2008, 06:53AM

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programming example.. i doubt but for ADC, you can try with Dallas (http://www.maxim-ic.com/). They are costly like 400rs for one IC.

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Mon Jun 30 2008, 09:09AM

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OK, is there any option for it? or I just use parallel 122 bit ADC. If yes please suggest IC.
thanks.

[ Edited Mon Jun 30 2008, 09:19AM ]

bharat

pdi33

Mon Jun 30 2008, 12:11PM

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A common parallel 12 bit ADC is the ICL7109. U may get it for around rs.100.(it doesnot come any cheaper than that.

). If u r using the 89s52 uC than another option is to interface the ICL7135 which is a 20,000 count ADC but the interfacing is a bit tricky if u can handle it. download the datasheet of 7135 and read the 'uC interfacing using two wires' note in it.
I specifically mentioned 89s52 as it has a special feature to output a 50% duty cycle high frequency output @ p1.0 which can be used as the clock for 7135.
good luck

[ Edited Mon Jun 30 2008, 12:13PM ]

* inspired to develop,developing to inspire *

shyam

Mon Jun 30 2008, 11:14PM

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hi BJ

if u wud not mind SPI instead of I2C , u will get adc's of even more resolution and higher bits.
try googling for CS5460A it can operate as 24 bit but DElta-sigma.

the cost be as high as 60 INR

lProgress is not made by early risers or hard workers, but by LAZY people, trying to find easier ways to do the same........

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pdi33

pdi33

Tue Jul 01 2008, 10:47AM

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nice one shyam bhai. will check that one out. if it works, it will solve a lot of my problems, thanks a lot.

btw, is it available commonly in india? hopefully will find a sample peice here in mumbai.

[ Edited Tue Jul 01 2008, 10:48AM ]

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Arun Kumar V

Tue Jul 01 2008, 06:34PM

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isn't the CS5460A a energy meter IC,

its called a 24 bit ADC but one can get 12-14 bits with good input filtering.

to get 24 bit resolution the input has to be very stable and should use very good filtering even then 24 bit is doubtful at the most 20-22 bit is what you get

better alternative can be AD7991 which is a 4 ch 12 bit ADC with I2C interface

there are N number of 12 bit ADCs from various companies

Arun

pdi33

Tue Jul 01 2008, 08:19PM

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no doubt there are many chips for 12 bit ADCs available arun, but what impressed me about the IC suggested by shyam was the price which is more than a value for money as compared to its features.

.

It is neverreally hard to find an IC which can fit ur specs (just google for it) but the real challenge is knowing whether it is available in ur local market and whether it fits ur pocket or budget.

.
Recently one of ur members (residing out of india) had a doubt of interfacing the AD7896 12 bit ADC so i checked its availabilty/price here and found that it cost around 1,150 INR!!!.

[ Edited Tue Jul 01 2008, 08:27PM ]

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shyam

Tue Jul 01 2008, 09:10PM

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hi PDI33

Arun is right it is an energy meter.
easily available in Mumbai.

by the way i already have some 20+ numbers with me if u require it .

one thing to note. u will find similar notes as what Arun said @ 8052.com

it is usually used to measure RMS voltages so a little bit of extra programming is required to make the data usefull .. and that shud be done considering the so low price .
60 INR is the maximum price one wud offer u for the IC.

lProgress is not made by early risers or hard workers, but by LAZY people, trying to find easier ways to do the same........

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pdi33

Wed Jul 02 2008, 02:35AM

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yep shyam,
the first thing i did when i read ur prev post , i downloaded the datasheet and came to know that it is a energy meter IC. still i feel no harm in using it as a general purpose ADC i think.
well, we do use the nokia graphical LCD for our own fancy projects though it is not meant for it don't we?

* inspired to develop,developing to inspire *