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Electrical specifications for ADC

Started by Oscar Javier Tadeo Jaramillo G January 26, 2004
Greetings.
 
I need work with the ADC module, sensing a senoidal wave, but i don't know what is the max in voltage amplitude of the input for ADC.
 
The ADC can work with negative and positive value in the input?
 
 
Thanks


Cordialmente,

Oscar Javier Tadeo Jaramillo Galeano
Nit: 98665185-4
Telefono: 300-779-60-62



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I have never found the electrical specifications of 5680x family. However, from what I've read, I assume that it also works with the core voltage: 0V ~ 3.3V. There is an application note that might help: DSP56800 ADC (AN1947/D).
 
If needed to measure a sine wave, I would use either two methods:
1) reduce amplitude and add offset. Play around with the VREF pin or do some sort of software calibration.
2) reduce amplitude and rectify (using a precision rectifier with opamps)
 
Check Motorola's application notes of Motor Control. They'll often have to take a sinusoidal current feedback, add offset and isolate from DSP. Take a look at page 29, application note MEMCOBUM/D.
 
Hope this helps, and buena suerte
Mariano
 
----- Original Message -----
From: Oscar Javier Tadeo Jaramillo G
To: m...@yahoogroups.com
Sent: Sunday, January 25, 2004 8:53 PM
Subject: [motoroladsp] Electrical specifications for ADC

Greetings.
 
I need work with the ADC module, sensing a senoidal wave, but i don't know what is the max in voltage amplitude of the input for ADC.
 
The ADC can work with negative and positive value in the input?
 
 
Thanks


Cordialmente,

Oscar Javier Tadeo Jaramillo Galeano
Nit: 98665185-4
Telefono: 300-779-60-62



car.gifBusc un auto?
Encontralo en Yahoo! Autos
M de 4000 clasificados todos los ds!
Usados - 0 km - Vendel tuyo

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