Technical Specifications for the BeBox
GeekPort data rates
From: JOENIKKI@NETCOM.COM (Joseph Palmer)
Subject: Re: GeekPort data rates?
Organization: Unlisted
Date: Wed, 24 Jan 1996 04:58:23 GMT
In article <4e3s18$j28@usc.edu>, ptok@cave.usc.edu (Phillip Tokumaru) wrote:
> Does anyone know what the specs are for the digital, a/d, and d/a on the
> geekport? The A/D and D/A are called "12 Bit ADC MAX186" and "8 Bit DAC
> MAX186" on the block diagram.
>
The D/A is 4 seperate channels going to 4 seperate pins on the GeekPort.
Each channel is 8 bits wide, and the output changes as soon as the register
(Which is just an ISA I/O address) is written. We have not tested the maximim
rate that the output slews.
The voltage range is from 0 to 4.080, .016 V/step (0-255)
The A/D is 12 bit convertor with an input mux, 4 Inputs go to pins on the
GeekPort. It is controlled through a serial interface in the Kasumi gate array.
A control byte containing the Mux code and some other control bits is
written into the ISA I/O space, and about 12 uS later, the data is ready
to be read as
a 16 bit quantity.
The voltage range is 0 to 4.096V, .004 V/Step (0-1023)
(There are also differential modes and bipolar modes, My data book is at work)
Both components are made by Maxim Semiconductor, Santa Clara, CA.
J.
________________________________
Joseph Palmer ***** Please send mail to jpalmer@be.com
Director of Hardware Engineering ***** http://www.be.com
Be, Incorporated.
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