Lpc2000

Hi All,

I am looking for block diagrams and operation and suggested usage 
detials on the LPC ADCs?

Both the UM and DS are a little light on for detials.

What is the ADC input impedance?

How does the FIFO operate.

Question
Is the 2124 and 2114 ADC modeled on the 80C552?

Thanks in advance

Joe.G

Hi Joe,

ADC input impedance between 20kOhm and 40 kOhm
Input capacitance 1 pF
There is no Fifo. Using one of the continuous modes requires servicing
through interrupts before another conversion is done otherwise loss of
data. 
The ADC is not modeled on the 80C552, it is a new development.

The ADC on all 3 above mentioned devices is the same though.
Hope this helps

Robert

--- In lpc2000@yahoogroups.com, "phlpcmicro" <joseph.goldburg@a...> wrote:

> 
> Hi All,
> 
> I am looking for block diagrams and operation and suggested usage 
> detials on the LPC ADCs?
> 
> Both the UM and DS are a little light on for detials.
> 
> What is the ADC input impedance?
> 
> How does the FIFO operate.
> 
> Question
> Is the 2124 and 2114 ADC modeled on the 80C552?
> 
> Thanks in advance
> 
> Joe.G

Robert:

Is that 20-40K biased toward a specific voltage?

M



--- In lpc2000@yahoogroups.com, "philips_apps" <philips_apps@y...> 
wrote:
> 
> 
> Hi Joe,
> 
> ADC input impedance between 20kOhm and 40 kOhm
> Input capacitance 1 pF
> There is no Fifo. Using one of the continuous modes requires 
servicing
> through interrupts before another conversion is done otherwise loss 
of
> data. 
> The ADC is not modeled on the 80C552, it is a new development.
> 
> The ADC on all 3 above mentioned devices is the same though.
> Hope this helps
> 
> Robert
> 
> --- In lpc2000@yahoogroups.com, "phlpcmicro" <joseph.goldburg@a...> 
wrote:

> > 
> > Hi All,
> > 
> > I am looking for block diagrams and operation and suggested usage 
> > detials on the LPC ADCs?
> > 
> > Both the UM and DS are a little light on for detials.
> > 
> > What is the ADC input impedance?
> > 
> > How does the FIFO operate.
> > 
> > Question
> > Is the 2124 and 2114 ADC modeled on the 80C552?
> > 
> > Thanks in advance
> > 
> > Joe.G

Does this also apply to pins which can be used for A/D, even if they 
are used for a different function?

The 213x User Manual says that "analog inputs are always connected to 
their pins, even if the Pin Multiplexing Register assigns them to 
port pins".



--- In lpc2000@yahoogroups.com, "philips_apps" <philips_apps@y...> 
wrote:
> 
> 
> Hi Joe,
> 
> ADC input impedance between 20kOhm and 40 kOhm
> Input capacitance 1 pF
> There is no Fifo. Using one of the continuous modes requires 
servicing
> through interrupts before another conversion is done otherwise loss 
of
> data. 
> The ADC is not modeled on the 80C552, it is a new development.
> 
> The ADC on all 3 above mentioned devices is the same though.
> Hope this helps
> 
> Robert
> 
> --- In lpc2000@yahoogroups.com, "phlpcmicro" <joseph.goldburg@a...> 
wrote:

> > 
> > Hi All,
> > 
> > I am looking for block diagrams and operation and suggested usage 
> > detials on the LPC ADCs?
> > 
> > Both the UM and DS are a little light on for detials.
> > 
> > What is the ADC input impedance?
> > 
> > How does the FIFO operate.
> > 
> > Question
> > Is the 2124 and 2114 ADC modeled on the 80C552?
> > 
> > Thanks in advance
> > 
> > Joe.G