NI PXI-6259 16-Bit Multifunction DAQ Module

The NI PXI-6259 is a 16-bit multifunction DAQ module engineered for PXI systems requiring high-performance analog input, analog output, and digital I/O capabilities. Built for measurement and control applications in research, development, and automated testing, this module delivers 1 MS/s sampling on analog inputs with software-selectable ranges, 2 channels of analog output, and 24 configurable digital I/O lines. Its precision analog front-end, onboard timing, and PXI trigger integration make it suitable for complex acquisition tasks demanding accuracy and speed.

– Technical Specifications

Analog Input
• 32 single-ended or 16 differential channels
• 16-bit resolution
• Software-selectable ranges: ±10 V, ±5 V, ±1 V, ±0.2 V
• Maximum sampling rate: 1 MS/s per channel
• Anti-aliasing filter: 50 kHz (-3 dB)
• Input impedance: 10 MΩ || 100 pF (bridge/differential), 5 MΩ || 100 pF (single-ended with AI GND referenced to AI SENSE), 1 MΩ || 100 pF (single-ended without reference)
• CMRR: 70 dB at 50/60 Hz (differential)
• Noise: < 30 µVrms typical (10 V range)
• Offset: < 50 µV typical
• Gain error: < 0.02% typical
• Linearity error: < 0.01% typical
• AC rejection: Software-selectable (50 Hz, 60 Hz, 400 Hz)

Analog Output
• 2 channels
• 16-bit resolution
• Software-selectable ranges: ±10 V, ±5 V, ±1 V
• Maximum update rate: 1 MS/s
• Output impedance: < 10 Ω
• Output current drive: ±5 mA typical
• Output noise: < 5 mVrms typical
• Gain error: < 0.02% typical
• Linearity error: < 0.01% typical

Digital I/O
• 24 channels, individually configurable as input or output
• TTL/CMOS compatible (0 V to 5 V)
• Input thresholds: VIH 2.0 V minimum, VIL 0.8 V maximum
• Output levels: VOH 2.4 V minimum, VOL 0.4 V maximum (at 2.4 mA)
• Debouncing filter: Selectable (off, 25 µs, 100 µs, 500 µs)

Timing
• Onboard temperature-compensated crystal oscillator (TCXO)
• External clock input supported
• PXI trigger bus integration

Power
• Typical consumption: < 3.5 W from PXI backplane

– Key Features

• 16-bit resolution across all analog I/O channels
• Flexible analog input configuration: 32 single-ended or 16 differential
• Low-noise analog front-end with 70 dB CMRR
• Precise analog output with < 5 mVrms noise
• 24 digitally programmable I/O lines with debounce options
• High-stability onboard timing with external synchronization capability
• Low power draw optimized for PXI slot operation

– Typical Applications

• Multi-channel sensor signal conditioning and acquisition
• Automated test systems requiring simultaneous analog and digital control
• Real-time measurement in laboratory and bench-top instrumentation
• Industrial process monitoring with mixed-signal I/O

– Compatibility & Integration

The PXI-6259 integrates into standard PXI chassis and communicates via the PXI backplane. It supports external timing sources and PXI trigger signaling for synchronized multi-module operations, making it suitable for distributed measurement systems.