The NI PCI-6731 is a 16-bit analog output board delivering simultaneous multichannel signal generation at 1 MS/s per channel. It provides 4 analog output channels with ±10 V range, 8 digital I/O lines, and 2 counter/timers for encoder and PWM applications. The board integrates an 8,192-sample FIFO buffer and supports external clocking and digital triggering via the RTSI synchronization bus.
Technical Specifications
Analog Output
• 4 channels, 16-bit resolution
• 1 MS/s update rate per channel
• ±10 V output range; ±11 V output capability; ±25 V overvoltage protection (powered on)
• Double-buffered, multiplying DAC architecture
Digital I/O
• 8 lines, 5 V TTL/CMOS compatible
Counter/Timers
• 2 × 24-bit counters at 20 MHz
• Non-quadrature encoder inputs (count and direction) or PWM outputs; each counter operates in one mode only
• 2 × 24-bit PWM outputs via counters 0 and 1 at 20 MHz timebase
• No encoder filtering support
Memory & Buffering
• 8,192-sample FIFO buffer
• FPGA: Xilinx XC2S100 (system-accessible, requires power cycle for sanitization)
• EEPROM: 8 kB configuration; 512 B calibration and metadata
Physical & Environmental
• 68-pin male SCSI-II connector
• 17.5 × 10.7 cm (6.87 × 4.2 in.)
• Operating temperature: 0 to 50 °C; storage: –20 to 70 °C
• Humidity: 5 to 90% RH (noncondensing)
• Maximum altitude: 2,000 m; pollution degree 2
– Key Features
• Simultaneous updates across all 4 analog channels
• External clock and digital trigger inputs for synchronization
• RTSI bus integration with NI data acquisition, motion, and vision products
• Configurable via Measurement & Automation Explorer (MAX)
– Typical Applications
• Waveform and stimulus generation
• Process control and proportional integral derivative (PID) replacement
• Acoustic distortion and stimulus-response testing
• Three-phase power simulation
• Function and arbitrary waveform generation
– Compatibility & Integration
• PCI, PXI, and CompactPCI form factors
• NI-DAQmx driver support
• LabVIEW, LabWindows/CVI, Microsoft Visual C++, Visual Basic, and Borland C++ compatible
