September 21, 2009 1:00 PM

From Microcomputer Systems, Inc.

PC/104 A/D Converter features up to 32 channels with simultaneous conversions in 2.2us

Contact Name: John Hilburn
Contact Email: staff@microcomputersystems.com
WebSite: http://www.microcomputersystems.com/msi_2002.htm

The MSI-P420 series is a low cost, high performance 12-bit analog input card designed for use with all PC/104 embedded systems. A special feature for the series is the simultaneous conversion of all channels activated from software or from an external pulse. Four models provide input capacities of 8, 16, 24 or 32 channels which operate from a single +5V supply for input ranges of 0-5V (MSI-P420), ±5V (MSI-P421) and ±10V (MSI-P422) with a non-linearity of ±1/2 LSB. The inputs are overvoltage tolerant to +9V and ±15V for unipolar and bipolar units, respectively.  
 
The card employs up to four MAX13xx, xx= 04, 08 or 12) 8-channel A/D converters that incorporate a precision 2.5V reference source with buffer amp, an internal 15 MHz clock, and independent track-and-hold (T/H) circuitry for simultaneous sampling of each channel. Channels for each of four devices can be enabled or disabled via the configuration register of the devices. Conversion times are approximately 0.8us to 2.2us for 1 to 8 channels, respectively, of each device. Since conversions are simultaneous, all four devices are converting at the same time for a maximum time of approximately 2.2us for all 32 channels. 
 
The card is I/O mapped using 16-bit addressing to select the input channels and device status. Option jumpers are provided for specifying the card base addresses A8 thru A15 and interrupts IRQ2 thru IRQ15. 
 
Operates from -40°C to +85°C. Requires +5V only.