The NI PXI-5421 is a 1-channel, 16-bit arbitrary waveform generator delivering 100 MS/s native sampling with effective rates up to 400 MS/s via interpolation. This single-slot 3U PXI module generates precise arbitrary waveforms and standard functions (sine, square, triangle, ramp) across a 43 MHz bandwidth using direct digital synthesis. The 16-bit DAC resolution and sub-1.0 ps RMS jitter enable high-fidelity stimulus-response testing and phase-coherent signal simulation.
Output spans -6 V to +6 V with software-selectable 50 Ω or 75 Ω impedance. The main analog path delivers up to 12.00 V pk-pk (variable from 5.64 mV pk-pk), while direct and low-gain paths provide alternative output ranges. Spurious-free dynamic range reaches 91 dBc, with total harmonic distortion of -62 dBc at 10 MHz and average noise density of -148 dBm/Hz. A 43 MHz, 7-pole elliptical analog filter ensures signal integrity with ±0.25 dB passband flatness (0 to 40 MHz).
Technical Specifications
• Sampling Rate: 100 MS/s native; 400 MS/s effective (2x, 4x, 8x interpolation)
• DAC Resolution: 16 bits
• Bandwidth: 43 MHz
• Output Range: -6 V to +6 V; main output 5.64 mV to 12.00 V pk-pk
• Output Impedance: 50 Ω or 75 Ω (software-selectable)
• SFDR: 91 dBc (close-in)
• THD: -62 dBc at 10 MHz
• Phase Noise: -137 dBc/Hz (10 MHz carrier, 10 kHz offset)
• Jitter (RMS): <1.0 ps
• Onboard Memory: 8 MB, 32 MB, 256 MB, or 512 MB configurations
– Key Features
• Direct digital synthesis with arbitrary waveform support
• High-resolution sample clock (1.06 µHz in high-resolution mode)
• Pulse aberration <5%
• Divide-by-N, high-resolution, and external sample clock modes
• PXI trigger bus, RTSI, and star trigger synchronization
• Optional 16-bit LVDS digital pattern output
– Typical Applications
Signal stimulus for communications, consumer electronics, scientific research, automotive, and military/aerospace environments. Phase-coherent multichannel generation via PXI integration. Complex waveform validation and custom signal simulation.
– Compatibility & Integration
Full PXI ecosystem support via NI Synchronization and Memory Core (SMC) architecture. Direct synchronization with digitizers and other PXI instruments through standard trigger and timing buses.
