GE IC697MDL752 12 VDC Output, 0.5 Amp, Positive Logic
• 64 differential or single-ended inputs
• 16-bit A/D conversion
• Software-selectable conversion rate (100 kHz maximum)
• Program-selectable scanning of 1, 8, 16, 32, or 64 channels
• Continually digitizes selected input channels and stores the results
• Three trigger modes
— Software trigger
— External trigger
— Interval timer trigger
• Three scan modes
— Autoscan
— Single scan
— Random access
• Programmed VMEbus interrupts
• User-programmable interval timer
• Software-programmable gain 1 and 10
• External trigger to synchronize multiple boards simultaneously
• Jumper-selectable A/D ranges of 0 to +5 V, 0 to +10 V, ±2.5 V,
±5 V, and ±10 V
• Optional low pass filter
• Overvoltage protected inputs
• 1,024-word data buffer (16-word deep buffer x 64 channels)
• Selectable output coding
• Powers up in autoscanning mode with unity gain
APPLICATIONS
• Factory automation and instrumentation
• Process control
• Laboratory instrumentation
• Machine monitoring
• Data acquisition
INTRODUCTION — This product is designed to
support 64 channels of differential or single-ended wide
range (±250 mV to ±10 V) analog inputs.
The board supports the following operating modes which
are described below:
Trigger Modes
Software Trigger
External Trigger
Interval Timer Trigger
Scan Modes
Autoscan
Single Scan
Random Access
One thousand twenty-four dual-port Data Registers
provide storage for continuous scanning of all channels. The
trigger and scanning modes are executed automatically at
power up, system reset, or are entered under program control.
The dual-port registers allow VMEbus access at any time to
read the latest stored data.
Channel gain is under software control and can be fixed
at x1 or x10 or each channel individually programmed for
either gain. Conversion rate is selectable up to 100 kSPS
(thousand samples/s) with the high-performance option, and
50 kSPS with the standard performance option. Low pass
input filters are available.

A functional block diagram is provided in Figure 1 and
the Ordering Options are provided on page 2 of this
specification.
FUNCTIONAL CHARACTERISTICS
(At +25 ˚C and rated power supplies, unless otherwise
stated.)
Operating Modes:
Trigger Mode:
Software Trigger: The selected scan mode is initiated
by writing to the software trigger address.
External Trigger: An external trigger, received on the
P2 connector, initiates the selected scan mode.
Interval Timer Trigger: The selected scan mode is
initiated each time the programmed time interval
expires.
Scan Mode:
Autoscan: This is the default scan mode. All active
channels are scanned continuously in sequential order.
Single Scan: A single data burst (scan of all selected
channels) is initiated by the selected trigger mode.
After all selected channels have been scanned, the
scanning process stops and waits for another trigger.
Random Access: A single channel can be selected,
digitized, and stored each time the selected trigger
mode is enabled.
Channel Autogain: The unique gain code for each
channel is loaded from the VMEbus into a gain buffer.
The assigned code is retrieved from the buffer in
real-time for each channel acquisition.