Hello all,

Can anyone recommend an ADC that takes an input voltage from a thermistor bridge circuit between 0-5VDC and outputs 8 parallel digital signals?

I dont know how to use a Microcontroller so Im going to use a 7seg display.

 

Hello,

8 bits parallel will give you values between 0 and 255.
How are you going to "decode" the values to the displays?

This page of the EDUCYPEDIA will give you an overview of ADC types:
http://educypedia.karadimov.info/electronics/digitalconvertors.htm

Bertus

 

I was going to use a range of 0-50C with 6 bits, 51 outputs used and 11 spare

I was thinking split the 6 bits so 3 bits represent a decimal number and using 2 BCD to 7seg.

 

Hello,

When you split a 6 bits binary value into 2 3 bits binary values, the BCD decoders will show values of 0 to 7 each.
This will not give the wanted values of 0 - 50 on the dual display.

Bertus

 

maybe use 8 bit and split to 4 each, How would this usually be done without a MP?

 

Hello,

You can take the 6 bits and convert the values to BCD using an 74185.
See the attached data sheet for more info.

Bertus

 

yeah great, do you know of a simple ADC for this kind of application? The analog input to it is DC between 0 - 5V.

 

Hello,

Have a look at the ADC0804.
You can feed the 6 highest bits to the 74185 and the next lower bit set a 0 or 5 for the half degrees.

Bertus

 

A simpler solution is to use ICL7107 ADC.

 

I'm with MrChips' recommendation. That device will directly drive an LED or LCD display (depending upon the model) and gives you nearly 11 bits of resolution (3 1/2 digits or 1999 decimal full scale).

 

Ideally a 5 bit ADC is what I want so I can have a range of 0 - 31C. I have setup a working 8 bit Adc0804 in Proteus. Can this be modified to 5 bit?

I'll also look into the ICL7107 ADC.

 

Hello,

You can take the 5 highest bits of the ADC0804.
Then the bits will change over the 0 - 5 Volts range.

Bertus