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ADC maximum value issue

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RenesasT

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Hello All,

I am interfacing ADS1501 12 bit ADC with controller. I am getting proper o/p form 0 to 0x7fffh with variable POT of 1k,5ketc.

Now thing is that 12 bit ADC should get result o/p upto 0x1000h but I am not getting that much of value.

My supply voltage is 5V and I have used 10kohm resistors to pull up SDA and SCL lines.

Please support me.
 

Now thing is that 12 bit ADC should get result o/p upto 0x1000h but I am not getting that much of value.
Click to expand...
hello,

unsigned 12 bit cover :
0 to 4095
0 to 0x0FFF (less than 0x1000)

is the adc result an unsigned 12 bits value ?
else you will get
-2048 to + 2047
 

Hello everyone,

Can you please suggest me single ended o/p ,I2C compatible ADC
24bit,16bit

I dont need negative values.

It will be more helpful for me.
 

Hi,

Best is do it on your own.

Go to a distributor's internet site and use their interactive ADC selection guide.
Or go to any ADC manufacturer and do the same.

Klaus
 

I have done the same.

I am not geeting any adc having following specs,

ADC-16bit and 24bit

Only positive scale required.

do not need negative values.

single ended o/p ,I2C compatible ADC

may you guys may know better option for the same. please suggest.
 

hello

just in the middle !
18bit ADC MCP3421 (1 chanel ) with PGA (1,2,4,8) (programmable Gain Amplifier)
18-Bit Analog-to-Digital Converter
with I2C Interface and On-Board Reference

i **broken link removed** (version 4Ch)with a 18F258 MPLAB C18
 

Hi,

I am not geeting any adc having following specs
Click to expand...
Nonsense.
Farnell shows more than 100 ADCs with I2c and 16...24 bits of resolution.

Some of them have unsigned output data.
But most of them have binary two´s complement format. As long as you don´t apply negative voltage you don´t need to do anything.
And in case you want to avoid negative digital values, then it´s just one line of code....

Klaus
 

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