ADA520 Low-Cost Integrating Board

RTD Embedded Technologies, Inc.

ADA520 Low-Cost Integrating Board

Features:

8 DIFF, 8 SE with GND, or 16 SE analog input channels
Programmable gains of 1, 10, 100 & 1000 or 1, 2, 4 & 8
13-bit (12-bit plus sign) integrating converter
Selectable conversion speeds: 7.5/30 Hz or 6.25/25 Hz
-5 to +5 volt input range; 1.22 mV resolution at a gain of 1
>10Mohm input impedance, input overvoltage protection
Trigger in/out for Synchronous sampling on multiple boards
Two 12-bit uni/bipolar analog output channels
Vout and Iout references for sensor excitation
Three 16-bit timer/counters, on-board 8 MHz clock
32 TTL/CMOS programmable digital I/O lines
50-pin I/O connector, 40-pin on-board I/O connector
Compatible with TMX, USF, MR, OP, OR, TS expansion boards
Hardware-enabled interrupts
rtdLinx™ universal TSR DOS driver with calling examples
QuickBASIC and Turbo C source code

Analog Inputs
The 520 provides eight inputs which can be individually configured as differential or single-ended with dedicated grounds. Or, you can choose 16 single-ended input channels without dedicated grounds. The input voltage range for all boards is +/-5 volts.

Gain
Programmable gain on the 520 provides resolution to 1.3 microvolts at a gain of 1000. The 520 is also available with a 1, 2, 4, and 8 gain configuration on request. The gain for each channel can be independently programmed by setting a new gain value each time a new channel number is selected.

A/D Conversions
A 13-bit (12-bit plus sign) dual slope integrating A/D converter performs highly accurate single or continuous conversions at a rate of either 7.5 or 30 samples per second. The 7.5 Hz rate provides at least 60 dB rejection of 60 Hz line noise, ensuring very reliable and virtually noise-free data collection. When you specify operation in a 50 Hz line noise environment, a crystal is installed for 6.25/25 Hz switch-selectable conversion speeds.

Trigger Input/Output
Trigger I/O can be used to Synchronize conversions on two or more boards cascaded in a "master/slave" configuration. A trigger to the master board simultaneously starts a conversion on all boards.

Analog Outputs
The ADA520 has two 12-bit analog output channels with matched D/A converters and fast settling output buffers. Each channel is independently jumper selectable for one of four ranges: 0 to +5, 0 to +10, +/-5, or +/-10 volts.

Vout and Iout References
A +5V voltage and 5 mA current output reference are provided for sensor excitation.

Digital I/O
The 520 has 32 digital I/O lines available at the I/O connectors, 24 lines with high current capability and eight lines for transmitting standard TTL signals.

Timer/Counters
An 8254 programmable interval timer on the 520 contains three independent 16-bit timer/counters for implementing a wide range of timing and counting functions.

Recommended Accessories:

Ordering Information

Part Number: ADA520

Go to ISA bus menu Home Page