Agilent / Keysight MSO9404A Mixed Signal Oscilloscope: 4 GHz, 4 Analog Plus 16 Digital Channels

The Keysight MSO9404A is a 4 GHz mixed-signal oscilloscope combining analog, digital, and protocol analysis in a single instrument. With 4 analog channels and 16 digital channels, it delivers up to 20 GSa/s sampling on 2 channels and up to 1 Gpts memory depth per channel. Advanced triggering - including edge, glitch, runt, timeout, pattern, state, pulse width, window, and serial modes - enables capture of elusive signal anomalies.

The 15-inch XGA color touchscreen provides intuitive signal visualization and drag-and-drop measurement workflows. Engineers rely on the MSO9404A for embedded systems development, signal integrity analysis, and protocol-level debugging. Its integrated logic analyzer displays critical timing relationships across 16 digital channels.

The protocol analyzer with packet viewers correlates physical layer signals to protocol behavior, supporting serial, I²C/SPI, CAN/LIN/FlexRay, USB, Ethernet, DDR, MIPI D-PHY, and JTAG standards. Up to 10 simultaneous measurements with statistics streamline characterization workflows. Input impedance selectable at 1 MΩ or 50 Ω accommodates both high-impedance and matched-load measurements, with offset accuracy of ±(1.25% offset + 1% full scale + 1 mV).

Technical Specifications

• Bandwidth: 4 GHz


• Analog Channels: 4


• Digital Channels: 16


• Sample Rate: Up to 20 GSa/s (2 channels); 10 GSa/s (4 channels)


• Memory Depth: Standard 20 Mpts per channel, upgradable to 1 Gpts


• Vertical Resolution: 8-bit


• Display: 15-inch XGA color touchscreen LCD


• Input Impedance: 1 MΩ or 50 Ω


• Input Connectors: BNC (analog); ZIF connector (digital logic probes)


• Power: 100–240 VAC; 375 W maximum dissipation


• Dimensions: 9 inches (23 cm) deep


• Weight: 26 lbs (11.8 kg)

Key Features

• InfiniiScan advanced triggering for edge, glitch, runt, timeout, pattern, state, pulse width, window, setup/hold, video, and serial conditions


• Integrated logic analyzer for timing correlation across 16 digital channels


• Integrated protocol analyzer with packet drilling and time-correlated physical/protocol layer viewing


• Drag-and-drop measurement functionality with simultaneous display of 10 measurements and statistics


• Dynamic range: ±8 divisions from center screen


• LAN (LXI Class C), USB, and RS-232 connectivity

Typical Applications

• Embedded systems and firmware debug


• Signal integrity and timing analysis


• Multi-protocol packet inspection (serial, I²C/SPI, CAN/LIN, USB, Ethernet, DDR, MIPI D-PHY, JTAG)


• Compliance testing and jitter characterization


• FPGA dynamic probing

Compatibility & Integration The MSO9404A supports application-specific software including MATLAB integration, EZJIT/EZJIT Plus jitter analysis, power measurement, and DDR validation packages.