Abaco Systems / VMIC VMIVME-3122-001 High-Performance 16-Bit Analog-to-Digital Converter (ADC)

The Abaco Systems / VMIC VMIVME-3122-001 is a 16-bit VME-based analog-to-digital converter delivering data acquisition across 64 differential or single-ended input channels. The board performs precise analog-to-digital conversion with software-selectable rates up to 100 kSPS, dual-ported data memory for continuous scanning, and programmable bus interrupters that minimize host processor overhead.

Technical Specifications

• Resolution: 16-bit ADC


• Channel Count: 64 differential or single-ended inputs


• Maximum Conversion Rate: 100 kSPS (software-selectable)


• Configurable Channel Scanning: 1, 8, 16, 32, 48, or 64 channels


• Gain Control: Software-controlled, selectable x1 or x10 per channel


• Input Bandwidth (typical, 20 Vp-p): 5 kHz (standard) / 40 kHz (high-performance)


• Common-Mode Rejection: Minimum 75 dB at ±2.5 V and 0 to +5 V (differential)


• Access Time: 600 ns maximum (nonscanning), 600 ns typical / 1.2 µs maximum (scanning)


• Input Filtering: Low-pass filters available


• Data Memory: Dual-ported registers for continuous scan storage


• On-Board Timers: Programmable scan interval control

Key Features

• Three trigger modes: software-initiated, external (P2 connector), and interval timer


• Two scan modes: autoscan (sequential all channels) and single scan (single burst per trigger)


• Programmable bus interrupter reduces processor involvement


• Common-mode/floating input protection (option: 22 MΩ pull-down to ground per channel)


• Board Identification Register (BIR) for VMIVME-3122 code verification


• Configuration Control Register (CCR) for buffer management

Typical Applications Demanding data acquisition environments requiring precise multichannel analog signal digitization with minimal CPU utilization, including real-time monitoring, industrial control, and signal processing systems.

Compatibility & Integration Full VMEbus compatibility enables integration into existing VME backplane systems. Flexible input configuration supports both differential and single-ended signal sources.