The Agilent/Keysight 83491A is a plug-in clock and data recovery module for Keysight Digital Communications Analyzers. It extracts timing and signal information from high-speed telecommunications and datacom signals, enabling precise parametric measurement when clock recovery is required. The module integrates a 50/50 electrical splitter, eliminating the need for external triggering hardware and reducing test setup complexity.
Technical Specifications
Data Recovery & Triggering
• Selectable data rates: 155, 622, 1063, 1250, 2125, 2488, and 2500 Mb/s
• Data triggering range: 50 Mb/s to 2500 Mb/s
• Clock recovery accuracy: ±0.1%
• Output jitter (all rates): 0.0125 UI
Clock Recovery Bandwidth
• Internal path triggering: 50 to 70 kHz phase-locked
• External output: 4 to 5 MHz phase-locked
Trigger Performance
• Limited Mode bandwidth: DC to 100 MHz
• Normal Mode bandwidth: DC to 2.5 GHz
• High Speed Mode (Option 100): 2.0 GHz to 12 GHz (typically 1 GHz to 15 GHz)
• Trigger sensitivity (High Speed Mode): 200 mVpp minimum from 2.0 GHz to 12 GHz (sine wave input)
• Trigger level range: ±1 V
• Trigger jitter (Normal Mode): <2.5 ps rms + 5E-5×delay at 2.5 GHz with 200 mV source
• Trigger jitter (High Speed Mode): <2 ps rms
Signal Path Characteristics
• Operating input power: -10 dBm to +3 dBm
• Through path insertion loss: 7 dB up to 2500 MHz; 10 dB at 4500 MHz
• Electrical return loss: 20 dB DC to 1250 MHz; 15 dB from 1250 MHz to 2500 MHz
• Input impedance: 50 Ohm
– Key Features
• Built-in 50/50 electrical splitter reduces external hardware requirements
• Selectable data rates across legacy and modern datacom standards
• Multiple trigger bandwidth modes for application-specific optimization
• Optional high-speed mode extends trigger capability to 15 GHz
• Low output jitter supports precision timing analysis
– Compatibility & Integration
The 83491A operates with the following Keysight mainframes: 86100A/B Infiniium DCA, 86100C Infiniium DCA-J, 86100D Infiniium DCA-X, and 83480A Digital Communications Analyzer. Interface via 3.5 mm (m) electrical connectors.
