BS2 Project and ADC''s
Archiver
Posts: 46,084
ADC
MAX186
OPAMP----AD822
The MAX186 is 12 bit, has internal 4.096 Vref, and had 8 inputs.
I know you don't need 8 inputs but Maxim will sample 2 for free and
they come in DIP package. Most of the newer serial ADC's from Maxim
come in insanely small surfacemount packages which are impossible to
breadboard for the average hobbiest.
Code available here to get you started:
http://geocities.com/SiliconValley/Orchard/6633/projects.html
AD822 is rail to rail, single supply, low offset, low drift, and has
FET input which means it has low bias current.
The LT part you mentioned is overkill and the AD part you mentioned
wasn't rail to rail and had 3 mV offset.
Jason
--- In basicstamps@yahoogroups.com, "Richard Skinner"
<rwskinner@w...> wrote:
> Okay, let me try a different approach. Sometimes I don't give
enough info
> and sometimes too much info.
> I would like to read a sensor with a BS2, I know I will need an
ADC, which
> needs to be a 12 bit. Can anyone recommend an serial ADC with
possibly a
> 4.096 built reference? I've used the 1298 before but I wanted
something a
> little more precise and since the 1298 uses the Vcc as it's
reference I
> wanted to avoid it (Unless someone has a great method to make it
very
> accurate and repeatable).
>
> The next part does not pertain to a stamp, but does have something
to do
> with my project, if you can't help, at least try and point me in
the right
> direction.
>
> The max my sensor puts out is 400mv, so I figured I would use an
> instrumentation amp to increase this signal by approx. 10 x with a
small
> adjustment for calibration purposes. This would give me the full
range of my
> ADC and the best resolution, I think. The amp needs to be a
single
> voltage like + 5vdc and Grd. I was looking at the AD626 and I
several
> LTC1052's but I never used them before. Can someone tell me if I'm
on the
> right path or if they have another item which is easy to work with
and is
> fairly accurate?
>
> I don't mind learning by hard knocks, but I rather not do it a
dozen times
> either.
> Throw me a bone please....
> Richard
MAX186
OPAMP----AD822
The MAX186 is 12 bit, has internal 4.096 Vref, and had 8 inputs.
I know you don't need 8 inputs but Maxim will sample 2 for free and
they come in DIP package. Most of the newer serial ADC's from Maxim
come in insanely small surfacemount packages which are impossible to
breadboard for the average hobbiest.
Code available here to get you started:
http://geocities.com/SiliconValley/Orchard/6633/projects.html
AD822 is rail to rail, single supply, low offset, low drift, and has
FET input which means it has low bias current.
The LT part you mentioned is overkill and the AD part you mentioned
wasn't rail to rail and had 3 mV offset.
Jason
--- In basicstamps@yahoogroups.com, "Richard Skinner"
<rwskinner@w...> wrote:
> Okay, let me try a different approach. Sometimes I don't give
enough info
> and sometimes too much info.
> I would like to read a sensor with a BS2, I know I will need an
ADC, which
> needs to be a 12 bit. Can anyone recommend an serial ADC with
possibly a
> 4.096 built reference? I've used the 1298 before but I wanted
something a
> little more precise and since the 1298 uses the Vcc as it's
reference I
> wanted to avoid it (Unless someone has a great method to make it
very
> accurate and repeatable).
>
> The next part does not pertain to a stamp, but does have something
to do
> with my project, if you can't help, at least try and point me in
the right
> direction.
>
> The max my sensor puts out is 400mv, so I figured I would use an
> instrumentation amp to increase this signal by approx. 10 x with a
small
> adjustment for calibration purposes. This would give me the full
range of my
> ADC and the best resolution, I think. The amp needs to be a
single
> voltage like + 5vdc and Grd. I was looking at the AD626 and I
several
> LTC1052's but I never used them before. Can someone tell me if I'm
on the
> right path or if they have another item which is easy to work with
and is
> fairly accurate?
>
> I don't mind learning by hard knocks, but I rather not do it a
dozen times
> either.
> Throw me a bone please....
> Richard