The Measurement Computing / ComputerBoards CIO-DAS1602/16 is a 16-bit multifunction analog and digital I/O board engineered for demanding data acquisition and real-time control applications. It integrates precision analog conversion, flexible digital I/O, and counter/timer functionality in a single ISA interface card, serving industrial automation, scientific instrumentation, and laboratory test environments.
Technical Specifications
Analog Input
• 16-bit resolution, 16 single-ended or 8 differential channels
• Switch-selectable input modes with common-mode rejection in differential configuration
• 100 kS/s aggregate sample rate; per-channel rate = 100 kS/s ÷ number of active channels
• Unipolar ranges: 0–10 V, 0–5 V, 0–2.5 V, 0–1.25 V
• Bipolar ranges: ±10 V, ±5 V, ±2.5 V, ±1.25 V
• Conversion speed: 10 µs
• Accuracy: 0.01% of reading ±1 bit
• Input impedance: 10 MΩ
• Temperature drift: zero 2 ppm/°C max., gain 30 ppm/°C max.
• Overvoltage protection: ±35 V continuous
Analog Output
• 12-bit resolution, 2 channels
• Onboard reference: 0–5 V and 0–10 V unipolar; ±5 V and ±10 V bipolar
• External reference input supported for custom ranges (0–10 V)
• Update rate: 100 kHz maximum (FIFO buffered)
• Output current: ±5 mA
• Non-linearity: ±1 bit; offset and gain error adjustable to 0
Digital I/O
• 32 total channels: 8 fixed on main connector (4 inputs, 4 outputs); 24 on auxiliary connector (two 8-bit banks, two 4-bit banks)
• Auxiliary banks software-configurable as input or output
• Input levels: low 0.8 V max. @ 20 µA, high 2.0 V min. @ 20 µA
• Main connector output levels: low 0.5 V @ 8.0 mA sink, high 2.7 V @ 0.4 mA source
• Auxiliary connector output levels: low 0.4 V @ 2.5 mA sink, high 3.0 V @ 2.5 mA source
Counters/Timers
• Three 16-bit counters, 82C54-compatible
• Two counters dedicated to A/D pacer clock timing
• Crystal oscillator: 1 or 10 MHz selectable
– Key Features
• 16-bit A/D resolution with ±35 V overvoltage protection ensures signal integrity in harsh environments
• Differential input mode reduces noise coupling in long-distance sensor applications
• Programmable gain and voltage ranges maximize resolution across varying signal amplitudes
• Onboard counter/timer support eliminates external timing circuitry for event counting and clock generation
• Mixed-signal architecture handles analog measurement and digital control in unified hardware
– Typical Applications
• Industrial process monitoring and closed-loop control
• Multi-channel sensor data logging with synchronized timing
• Laboratory instrumentation requiring precision analog measurements
• Equipment diagnostics and automated test systems
– Compatibility & Integration
ISA interface card design ensures compatibility with legacy industrial PC platforms and embedded systems architectures.
