Keysight (Agilent) 1690AD PC-Hosted Logic Analyzer

The Keysight (Agilent) 1690AD is a PC-hosted logic analyzer that delivers 136 channels of digital signal capture and analysis for circuit debugging and validation. Built around a Windows-based interface and IEEE 1394 connection, it combines state and timing analysis modes to isolate signal integrity problems across high-speed buses and complex digital designs.

Technical Specifications

Acquisition Modes and Speed State analysis (synchronous sampling) operates at 200 MHz with 1 M samples per channel. Timing analysis provides two operational modes: conventional timing at 800 MHz (half-channel) or 400 MHz (full-channel) with up to 4 M samples (half-channel) or 2 M samples (full-channel), and transitional timing at 200 MHz with 1 M samples. Channel and Signal Specifications The instrument provides 136 total channels with single-ended signal support. Input threshold adjustment ranges from −6 V to 6 V in 10 mV increments, enabling precise capture across diverse logic families and signal levels. Triggering Quick triggers capture edges, patterns, and glitches within the context of displayed signals. A graphical trigger builder supports complex multi-condition scenarios for intermittent fault detection.

Key Features

• Automated threshold and sample position setup for high-speed bus measurements


• Simultaneous eye diagrams on all 136 channels for rapid signal quality assessment


• Offline analysis capability - captured data transfers to a Windows PC for independent review


• Time-correlated measurement integration with external oscilloscopes to evaluate analog signal quality impact on digital operation


• Quick-trigger box drawing around suspect events for recurrence verification

Typical Applications Digital circuit validation, bus-level protocol debugging, signal integrity analysis, and multi-channel timing correlation in designs requiring simultaneous observation across large channel counts.

Compatibility & Integration Connects to host PCs via IEEE 1394 port. Minimum host requirement: 500 MHz Intel Celeron or AMD K-6 II processor running Windows 2000 Professional. Compatible with 40-pin logic analyzer probes (ordered separately). Operating temperature: 0 °C to 55 °C (instrument); 0 °C to 65 °C (probe leads and cables); 10 °C to 40 °C (disk media).