Model Definition

• PXIe: PXI Express high‑speed modular bus

• 57: NI FlexRIO series (reconfigurable FPGA‑based instruments)

• 774: 2‑channel, 6.4 GS/s, 3 GHz bandwidth digitizer

• FlexRIO: FPGA‑programmable I/O for custom instrumentation

• Key variant: DC‑coupled, 12‑bit resolution, Kintex UltraScale FPGA

Key Specifications

• Channels: 2 single‑ended, simultaneous sampling

• Resolution: 12 bits

• Max sample rate: 6.4 GS/s (single‑channel interleaved); 3.2 GS/s (dual‑channel)

• Analog bandwidth: DC to 3 GHz (–3 dB)

• Input coupling: DC

• Voltage ranges: 200 mVpp, 1 Vpp (software‑selectable, with DC offset)

• Input impedance: 50 Ω (SMA female)

• Max input power: +10 dBm (continuous)

• Onboard memory: 4 GB DRAM (2 × 2 GB banks)

• FPGA: Xilinx Kintex UltraScale (KU040/KU060 options)

• Data interface: PXIe Gen 1, up to 4 GB/s throughput

• Trigger: External TRIG IN/OUT (SMA), PXI backplane trigger

• Reference clock: 10 MHz REF IN/OUT (SMA)

• Operating temperature: 0 °C to 55 °C

• Calibration interval: 2 years

Interface & Communication Configuration

• Host bus: PXI Express Gen 1, compatible with PXI/PXIe chassis

• Analog inputs: 2 × SMA female (AI 0, AI 1), 50 Ω

• Clock/reference: 1 × SMA (REF/CLK IN)

• Trigger: 1 × SMA (TRIG IN), 1 × SMA (TRIG OUT)

• FPGA I/O: 8 bidirectional DIO channels (via CLIP interface)

• Control software: FlexRIO driver, LabVIEW, LabWindows/CVI, C#, Python

• Synchronization: NI‑TClk, PXI star trigger, multi‑module phase alignment

Core Functions

• High‑speed waveform acquisition: Captures DC‑to‑3 GHz signals at up to 6.4 GS/s for ultra‑wideband RF and time‑domain measurements.

• Dual‑channel simultaneous sampling: Enables phase‑coherent multi‑channel acquisition for differential or MIMO systems.

• User‑programmable FPGA: Implements custom real‑time processing (filtering, FFT, triggering, decimation) via LabVIEW FPGA.

• Large onboard memory: 4 GB DRAM supports long‑duration waveform capture and streaming.

• DC‑coupled precision: Direct DC coupling eliminates AC‑coupling distortion, critical for baseband and low‑frequency RF signals.

• Flexible triggering: Supports edge, pulse, window, and software triggers; enables synchronized acquisition across multiple modules.

Applications

• Wireless communications: 5G NR, LTE, Wi‑Fi 6/7, and ultra‑wideband (UWB) signal capture and analysis.

• RF & microwave test: High‑speed transient analysis, pulse characterization, and wideband spectrum monitoring.

• Scientific instrumentation: Particle physics, laser diagnostics, and high‑energy physics waveform acquisition.

• Medical imaging: Ultrasound, MRI, and high‑speed biomedical signal recording.

• Semiconductor test: High‑speed digital/RF IC characterization and jitter analysis.

Usage & Maintenance

• Installation: Insert into 3U PXIe chassis; connect SMA inputs to DUT, REF/CLK to 10 MHz reference, and TRIG signals as needed.

• Warm‑up: 30 minutes at ambient temperature before high‑accuracy measurements.

• Operation: Select sample rate, voltage range, and triggering via software; avoid input overvoltage (>+10 dBm) to prevent damage.

• Maintenance: Keep SMA connectors clean and dry; inspect cables periodically; avoid electrostatic discharge (ESD).

• Calibration: Perform self‑calibration monthly; factory calibrate every 2 years to maintain accuracy.