Description

VMVIVME-3125 32-Channel 12-Bit A/D Converter Module

Product Description

Features:

16 Differential or 32 Single-Ended Analog Input Channels
One 12-Bit A/D Converter with Built-In-Track and Hold
Input Overvoltage Protection
40 kHz Aggregate Conversion Rate
Front Panel LED

The VMIC VMIVME-3125 32-Channel 12-Bit A/D Converter Module provides automatic scanning of 16 differential or 32 single-ended analog input channels. The channels are digitized with a 12-bit resolution Analog-to-Digital Converter (ADC). Each input is overvoltage protected and low-pass filtered. The board is very easy to use, no software setup is required. After powerup or system reset, the VMIVME-3125 automatically starts scanning each of its 16 or 32 input channels. Conversion data is stored automatically in a dual-port memory, making it immediately accessible from the VMEbus. The VMIVME-3125 provides on-board voltage references to perform an on-line or off-line built-in self-test. The input voltage range and gain are user-programmable with jumpers. The VMEbus base address and the access mode are fully selectable.

VMVIVME-3125

Product parameter

• 32 single-ended or 16 differential inputs
• Autoscanning; continuously digitizes inputs and stores results in dual-ported data registers
• Input ranges from ±50 mV to ±10 V or 0 to 25 mA
• Jumper-programmable gains of x1, x10, x100
• Selectable A/D ranges of ±5 V, ±10 V, 0 to +10 V
• 40 kHz aggregate conversion rate
• Supports real-time Built-in-Test
• Input connector compatible with both discrete wire and ribbon cables
• Selectable data coding; offset binary or two’s complement
• Overvoltage protected inputs
• Low pass input filters: 50 kHz, optional 40 Hz
• Pull-down resistors prevent floating inputs
• 1,000 V analog GND/digital GND isolator

Application field

VMIVME-3125 provides isolated 12-bit analog-to-digital conversion for 32 single-ended analog voltage input channels (16 differential) on a 6U Eurocard for the VMEbus. Selectable gain and A/D
ranges support input voltage ranges from ±50 mV to ±10 V.
Current input option supports 32 single-ended channels with 0 to 20 mA, 4 to 20 mA, and 5 to 25 mA ranges. To minimize system software overhead, all inputs are scanned and digitized continuously at an aggregate sample rate of 40,000 samples per second. Measurement data for each channel is constantly available to the VMEbus through a dual-ported Data Register. For voltage inputs, optional 40 Hz low pass input filters are available to minimize the effects of system noise. The standard unit comes equipped with 50 kHz low pass filters.
A jumper-selectable Programmable-Gain Amplifier (PGA) supports in-line voltage gains of x1, x10, or x100 for all channels. For voltage inputs, full-scale ranges for the A/D Converter are selectable as ±5 V, ±10 V, or 0 to +10 V. Data coding is software selectable as either offset binary or two’s complement.
Inputs can be jumper configured either as 16 differential voltage channels, or as 32 single-ended voltage or current channels. A single front panel 37-pin subminiature D provides connections for all input channels.
Figure 1 illustrates the internal functional organization of the VMIVME-3125 board.

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