The National Instruments PXI-5922 is a 24-bit flexible-resolution PXI digitizer engineered for high-accuracy analog measurements in spectrum analysis, audio signal processing, and precision small-signal applications. Built on the SMC architecture, it enables PXI synchronization across high-channel-count and mixed-signal test systems. The device trades sampling rate for resolution—delivering up to 24 bits below 500 kS/s and down to 16 bits at 15 MS/s—while maintaining low noise and distortion through the NI Flex II ADC.
Technical Specifications
• Resolution: 16 to 24 bits (flexible)
– Up to 24 bits at rates less than 500 kS/s
– Down to 16 bits at 15 MS/s
• Sample Rate: Up to 15 MS/s; real-time range 50 kS/s to 15 MS/s
• Bandwidth: 6 MHz
• Spurious-Free Dynamic Range: Up to 114 dBc; up to -108 dBc for dynamic signals to 100 kHz
• RMS Noise: As low as -120 dBFS at 50 kS/s; -117 dBFS (1 Vpp range); -120 dBFS (10 Vpp range)
• Noise Density: As low as -170 dBFS/Hz
• DC Accuracy: 0.06% at 1 kHz
• Crosstalk: 50 dB up to 1 kHz
• Analog Input: 2 simultaneously sampled channels; ±1 V and ±5 V ranges; selectable 1 MΩ or 50 Ω input impedance
• Onboard Memory: 8 MB/channel, 32 MB/channel, or 256 MB/channel; supports multirecord acquisition exceeding 400,000 triggered waveforms; continuous streaming to host or disk
– Key Features
• Dual-channel simultaneous sampling with selectable input impedance
• Flexible-resolution architecture for optimized SNR at application-specific rates
• Comprehensive triggering: edge, window, hysteresis, and software-based analog triggers; digital reference triggers
• Onboard VCXO with CLK IN/CLK OUT connectors for external synchronization
• Front-panel BNC connectors for TRIG and CLK signals
– Typical Applications
• Spectrum and harmonic analysis
• Audio and acoustic signal processing
• Precision DC and low-frequency measurements
• Multi-channel synchronized data acquisition
– Compatibility & Integration
Integrates into PXI chassis via SMC architecture, enabling mixed-signal test systems and multi-module synchronization.
