ADH987R701G32

Clock Buffers, Drivers Overview

The ADH987R701G32 is a space-grade, low-noise 1:9 fanout buffer manufactured by Analog Devices Inc. Operating from DC to 4.5 GHz, it distributes LVPECL clock signals across nine differential outputs and includes an additional RF output buffer. The device requires a single +3.3 V regulated supply and operates within a temperature range of -40°C to +85°C. It utilizes a 32-lead glass/metal hermetic surface-mount package (G32) compliant with MIL-PRF-38535 Level V standards. Key electrical characteristics include a phase noise floor of -157 dBc/Hz at 4.2 GHz and radiation tolerance up to 100 krads (Si).

Clock Buffers, Drivers Feature Summary

• DC to 4.5 GHz frequency operation with low phase noise performance.
• Space-qualified construction meeting MIL-PRF-38535 Level V requirements.
• Configurable input impedance selectable between 50 Ω and 150 Ω single-ended via SPI.
• Flexible control interface supporting both parallel pin logic and serial port (SPI) protocols.

Clock Buffers, Drivers Applications

• High-reliability aerospace clock distribution systems.
• Spaceborne radar and communication subsystems requiring radiation hardness.
• Precision test and measurement instrumentation operating in harsh environments.

Clock Buffers, Drivers Procurement Notes

Verify that the specific ordering suffix G32 corresponds to the 32-lead glass/metal hermetic SMT package. Confirm compliance with MIL-PRF-38535 Level V manufacturing flow. Ensure procurement channels provide necessary documentation for space-level qualification and radiation testing results.

Clock Buffers, Drivers Selection Notes

Select this component when a high-frequency, radiation-tolerant clock buffer is required for space applications. The device supports LVPECL inputs and outputs. Consider the SPI configuration capability if dynamic output enable/disable or input impedance adjustment is needed during operation.

Clock Buffers, Drivers Part Context

This part number represents the space-grade variant of the ADH987 family. It is functionally equivalent to the commercial HMC987 but adheres to stricter reliability and radiation specifications defined by MIL-PRF-38535. The 'R' designation indicates the specific radiation-hardened version available in the product line.

Clock Buffers, Drivers Replacement Considerations

For non-space applications, the commercial grade HMC987 serves as the functional equivalent. Verify package compatibility and ensure that radiation hardness requirements are not critical for the target application before substituting.