NI PCI-7831R Multifunction Intelligent DAQ Module

The NI PCI-7831R is a multifunction reconfigurable I/O (RIO) device for high-performance data acquisition and real-time control. Built around a user-programmable Virtex-II 1M Gate FPGA, it delivers custom on-board processing with direct I/O control, enabling precise timing and synchronization without host intervention. The module combines 8 independent 16-bit analog input channels (200 kS/s per channel), 8 independent 16-bit analog output channels (1 MS/s per channel, 1.0 µs update time), and 96 configurable digital I/O lines operating at rates up to 40 MHz. Each digital line supports custom logic, input/output, or counter modes at 3.3V TTL levels. The FPGA provides 40 × 18×18 multipliers and 720 kbits embedded block RAM for algorithm acceleration and specialized signal processing.

– Technical Specifications

FPGA & Processing
• Virtex-II 1M Gate FPGA with user-programmable logic
• 40 × 18×18 multipliers
• 720 kbits embedded block RAM

Analog Input
• 8 channels, 16-bit resolution
• 200 kS/s maximum per channel
• Successive approximation (SAR) ADC per channel
• Configurable modes: RSE, NRSE, DIFF
• ±3 LSB typical, ±6 LSB maximum INL

Analog Output
• 8 channels, 16-bit resolution
• 1 MS/s maximum per channel
• 1.0 µs update time
• Single-ended voltage output

Digital I/O
• 96 independent configurable lines
• 3.3V TTL compatible
• Up to 40 MHz operation
• Supports logic, inputs, outputs, counters, and PWM

– Key Features

• Direct FPGA control eliminates host-dependent timing bottlenecks
• Per-channel dedicated SAR ADCs ensure simultaneous multi-channel sampling
• Software-configurable input ranges and output modes
• Real-Time System Interface (RTSI) bus support for multi-module synchronization

– Typical Applications

• Custom signal conditioning and filtering on hardware
• High-speed counter and timing applications
• Specialized protocol acquisition and generation
• Real-time closed-loop control systems

– Compatibility & Integration

Programs via LabVIEW, LabVIEW FPGA Module, and LabVIEW Real-Time Module. Operates through NI-RIO driver software on PCI bus systems.