Abaco Systems / VMIC VMIVME-4150-201 Isolated 12-Bit Analog Output Board

The Abaco Systems / VMIC VMIVME-4150-201 is a 6U VMEbus analog output board delivering 12 fully isolated, 12-bit channels for industrial control and high-voltage isolation applications. Each channel provides galvanic isolation up to 1,000 VDC from peer channels and the VMEbus, with optical data coupling ensuring zero DC continuity. The board configures to 4, 8, or 12 channels and supports both voltage and current loop outputs with selectable ranges.

– Technical Specifications

Interface & Form Factor
• VMEbus (ANSI/IEEE STD 1984-1987, IEC 821/297)
• A16:D16/D08 and A24:D16/D08 addressing
• 6U Eurocard (160 × 233.35 mm)

Analog Output Channels
• Configurable: 4, 8, or 12 channels
• Resolution: 12-bit
• Full galvanic isolation between channels and VMEbus

Voltage Output Performance
• Ranges: ±2.5 V, ±5 V, ±10 V, 0 to +2.5 V, 0 to +5 V, or 0 to +10 V (jumper-selectable)
• Accuracy: 0.05%
• Load capacity: 10 mA across ±10 V range
• Output protection: ±20 V continuous; transients to ±50 V
• Gain error: ±0.04% maximum
• Offset voltage: ±4 mV
• Nonlinearity: 0.025%
• Gain drift: ±30 PPM/°C, ±75 PPM/1,000 hr
• Offset drift: ±10 µV/°C, ±25 µV/1,000 hr
• Settling time: 10 µs to 0.01%
• Output noise: ±6 mV peak-to-peak maximum (10 Hz to 10 kHz, 3σ)
• Interchannel crosstalk: -80 dB at DC-1 kHz
• Output impedance: 1 MΩ (disconnected)

Current Loop Output Performance
• Options: 4 to 20 mA, 0 to 20 mA, or 5 to 25 mA
• Accuracy: 0.08%
• Span error: ±0.06%
• Offset current: ±4 µA
• Nonlinearity: 0.035%
• Span drift: ±50 PPM/°C, ±70 PPM/1,000 hr
• Offset drift: ±80 nA/°C, ±250 nA/1,000 hr
• Settling time: 30 µs to 0.01%
• Internal compliance: 9 V; external compliance: 27 V
• External loop supply maximum: +30 VDC
• Output impedance: >10 MΩ across 0 to 25 V

Isolation Specifications
• Isolation voltage: Up to 1,000 VDC channel-to-channel and channel-to-VMEbus
• Isolation method: Optical data coupling
• Isolation resistance: 50 MΩ minimum
• Isolation capacitance: 100 pF maximum (channel-to-channel), 150 pF (channel-to-VMEbus)
• Common-mode voltage range: ±1,000 V

– Key Features

• Individually isolated channels eliminate ground loops and cross-coupling noise
• Jumper-configurable output ranges accommodate diverse signal standards
• Current loop outputs support remote industrial sensor excitation and transmitter feedback loops
• High output impedance in disconnected state prevents signal loading
• Low settling time enables fast system transient response

– Typical Applications

• Industrial process control with isolated sensor outputs
• Data acquisition systems requiring galvanic isolation
• Multipoint control where grounding loops present EMI risk
• Field devices with extended common-mode voltage requirements

– Compatibility & Integration

Designed for VMEbus systems conforming to ANSI/IEEE STD 1984-1987 with 6U mechanical compatibility. Supports A16 and A24 addressing modes with 16-bit or 8-bit data paths.