The Measurement Computing PCI-DAS4020/12 is a 12-bit multifunction data acquisition board for PCI bus systems, delivering analog input, analog output, and digital I/O in a single plug-and-play card. Engineered for test and measurement, process control, and demanding data acquisition applications, it features a 40 MHz crystal oscillator, dual 32 K × 24 sample FIFO with bus-master DMA and scatter-gather support, and software-selectable triggering modes. The board integrates an AD9225 pipelined A/D converter rated at 25 MSPS and dual AD7237 DACs, with throughput reaching 20 MHz on single or dual channels and 10 MHz across all four analog input channels. Configuration is BIOS-managed; full API access is provided through Measurement Computing’s Universal Library software across Windows programming languages.
Technical Specifications
Analog Input
• 4 single-ended channels, 12-bit resolution
• Input ranges: ±1 V or ±5 V bipolar (software-selectable)
• AD9225 converter, 25 MSPS pipelined architecture
• Termination: 50 Ω or high-Z (software-selectable)
• Auto-calibration for offset and gain per channel and range
• Maximum error: ±5.0 LSB worst-case; typical ±3.0 LSB
• DC coupling
Analog Output
• 2 channels, 12-bit resolution
• Output ranges: ±10 V or ±5 V (software-programmable)
• AD7237 dual DAC, ±5 mA drive capability
• Short-circuit protection at 25 mA limit
• 0 V power-up and reset state
Digital I/O
• 24 channels total (two 8-channel banks, two 4-channel banks)
• 82C55A controller, programmable by bank
• TTL signal levels
• Output drive: 2.5 mA at 0.5 V maximum or 2.5 mA at 2.0 V minimum
Timing & Data Transfer
• A/D throughput: 20 MHz single or dual channel; 10 MHz four channels
• 40 MHz crystal oscillator
• Programmable A/D pacer via internal counter
• Hardware or software A/D gating (internal or external)
• Dual 32 K × 24 sample SRAM-based FIFO
• Bus-master DMA with scatter-gather
Triggering
• A/D trigger sources: Internal software, external digital
• Hardware or software triggering modes
• TRIG1 for acquisition initiation; TRIG2 for post-trigger phase
• Interrupt sources: External, internal FIFO status
– Key Features
• Plug-and-play installation with BIOS configuration
• Per-channel and per-range auto-calibration
• Dual FIFO architecture for sustained data streaming
• Flexible termination and input range selection
• TTL-compatible digital I/O with programmable bank configuration
– Typical Applications
Data acquisition, bench instrumentation, process control, real-time signal conditioning, and multichannel test systems requiring integrated analog and digital I/O.
– Compatibility & Integration
Compatible with Measurement Computing Universal Library software; supports Windows programming languages; PCI bus interface.
