8 bit DAC

[jay]

I'm looking to convert 8 bit parallel data to analog chip and/or circuit.
The requirement is the DAC must be free running all the time (no timing for
writes, clears, whatever), single 12V supply and the output must slew from 0
to approximately 12V. I see not many DACs operate at 12V (like the AD7224
which slews from 0 to 10V).

Thanks
Jay

 

[ChrisGibboGibson]

"jay" wrote:

I'm looking to convert 8 bit parallel data to analog chip and/or circuit.
The requirement is the DAC must be free running all the time (no timing for
writes, clears, whatever), single 12V supply and the output must slew from 0
to approximately 12V. I see not many DACs operate at 12V (like the AD7224
which slews from 0 to 10V).

Look up "R2R ladder". Perfect for that application.

Gibbo

 

[Jamie]

if you already have a Parallel output then simply create a
resistor ladder on the 8 bit outputs.



jay wrote:

I'm looking to convert 8 bit parallel data to analog chip and/or circuit.
The requirement is the DAC must be free running all the time (no timing for
writes, clears, whatever), single 12V supply and the output must slew from 0
to approximately 12V. I see not many DACs operate at 12V (like the AD7224
which slews from 0 to 10V).

Thanks
Jay

 

[Rich Grise]

On Wed, 27 Oct 2004 15:44:42 -0700, Jamie wrote:

if you already have a Parallel output then simply create a
resistor ladder on the 8 bit outputs.



jay wrote:

I'm looking to convert 8 bit parallel data to analog chip and/or circuit.
The requirement is the DAC must be free running all the time (no timing for
writes, clears, whatever), single 12V supply and the output must slew from 0
to approximately 12V. I see not many DACs operate at 12V (like the AD7224
which slews from 0 to 10V).

Thanks
Jay

Apparently, these guys' teacher doesn't cover much background material.

Cheers!
Rich

 

[Leon Heller]

"jay" <pcb4u@earthlink.net> wrote in message
news:clorfj$vm$1@gateway.northropgrumman.com...

I'm looking to convert 8 bit parallel data to analog chip and/or circuit.
The requirement is the DAC must be free running all the time (no timing
for
writes, clears, whatever), single 12V supply and the output must slew from
0
to approximately 12V. I see not many DACs operate at 12V (like the AD7224
which slews from 0 to 10V).

Why not use a 5V DAC followed by an amplifier?

Leon