Abaco Systems / VMIC VMIVME-3122-420 High-Performance 16-Bit Analog-to-Digital Converter (ADC)

The Abaco Systems / VMIC VMIVME-3122-420 is a 16-bit analog-to-digital converter module engineered for VMEbus systems requiring high-accuracy data acquisition across multiple channels. This 6U form-factor board delivers 64 differential or single-ended analog inputs with software-selectable conversion rates up to 100 kSPS, programmable gains of ×1 or ×10, and flexible scanning modes including autoscanning, data bursts, and external synchronization. A dual-port data buffer (16 to 1,024 words) allows accumulated data in selectable blocks of 1, 8, 16, 32, or 64 channels.

The module supports multiple analog input ranges (±2.5 V, ±5 V, ±10 V, 0 to +5 V, 0 to +10 V) and VMEbus addressing via A16, A24, and A32 modes, with configurable interrupt routing (IRQ1–IRQ7). Access times are 600 ns maximum for nonscanning operations and 600 ns typical / 1.2 µs maximum for scanning. Optional low-pass filtering and signal conditioning board compatibility extend measurement capability to thermocouples, RTDs, and strain gauges.

Technical Specifications

• ADC Resolution: 16-bit


• Input Channels: 64 differential or single-ended


• Conversion Rate: 381 Hz to 100 kSPS (high-performance); 381 Hz to 50 kSPS (standard)


• Programmable Gains: ×1 or ×10


• Analog Input Ranges: ±2.5 V, ±5 V, ±10 V, 0 to +5 V, 0 to +10 V


• Data Buffer: 16- to 1,024-word dual-port; block sizes 1, 8, 16, 32, or 64 channels


• Input Bandwidth: 5 kHz typical (standard); 40 kHz typical (high-performance)


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


• VMEbus Addressing: A16, A24, A32


• Interrupt Configuration: IRQ1 through IRQ7


• Form Factor: VMEbus 6U


• Connectors: P3 and P4 support 96-pin DIN (nonlatching) or 64-pin DIN (latching)

Key Features

• Autoscanning, data burst, and externally synchronized trigger modes


• Optional low-pass filtering for noise reduction


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


• Multiple simultaneous board synchronization capability


• Optional conformal coating with standard VME front panel

Typical Applications

• Factory automation and process control


• Data acquisition systems and laboratory instrumentation


• Training simulators

Compatibility & Integration Direct interface with VMIC signal conditioning boards for thermocouple, RTD, and strain gauge signal acquisition. Supports multi-board synchronization for coordinated data collection.