icl7107 scale factor

[maxi]

Hi,

is it possible to setup the icl 7107 for a full scale of 1 volt?

In the data sheet i've saw that the full sclae are only 200mV,2 volt
etc.

How can i go to 1 volt full scale?

Thanks

max

 

[Phil Allison]

"maxi"

is it possible to setup the icl 7107 for a full scale of 1 volt?

** Ambiguous question.

Do you really want 1 volt to read 1.999 ??

In the data sheet i've saw that the full sclae are only 200mV,2 volt
etc.

** See page 10 under the heading 'Reference Voltage".

http://www.intersil.com/data/fn/fn3082.pdf


** Just make Vref equal to 500 mV.

1 volt input will then read 1.999 or overflow.




........ Phil

 

[martin griffith]

Hi,

is it possible to setup the icl 7107 for a full scale of 1 volt?

In the data sheet i've saw that the full sclae are only 200mV,2 volt
etc.

How can i go to 1 volt full scale?

Thanks

max

I had a quick look at the intersil datasheet, it seems that you alter
the Voltage Reference. See p10 in the data sheet
http://www.intersil.com/data/fn/fn3082.pdf



martin

 

[Spehro Pefhany]

Hi,

is it possible to setup the icl 7107 for a full scale of 1 volt?

In the data sheet i've saw that the full sclae are only 200mV,2 volt
etc.

How can i go to 1 volt full scale?

Thanks

max

You mean you want it to read 1999 at 1 volt in? If so, then just use a
500mV reference rather than a 1V reference with the 2V circuit. You
can cut the integration capacitor value in half to get a bit better
performance (by increasing the swing at the integrator output), but
you probably won't notice the difference.

If you just want to use it with a 3-digit display, and read 999 at 1V
in then just use the 2V circuit and wire the output drive for the
segments B,C (double current of the other outputs) to an overrange
LED.


Best regards,
Spehro Pefhany

 

[maxi]

Probably i dont't explicate me well.

i have a signal that rise from 0 to 600 mV at max.

I should use the 2v full scale for haven't overflow.

But i've only 3 digit precision.So i'd like to mesure from 0 to 600mv
with all 3 1/2 digit precision.

Example: with 2 volt full scale at 300mV the dyspaly show 0.300 and so
on.I'd like that dyspaly show 300.0.

Probably is not possible