Analog Devices Inc. AD880AJR

AD880 is a signal-processing element for optical-disk pickup servo systems. Four matched current-to-voltage input amplifiers receive signals from a quadrant photodiode. On-chip combinations form a summed data signal and focus and tracking error signals; two-quadrant dividers can normalize the servo outputs against received light level.

The product record identifies a 20-SOIC package, 0.295-inch (7.50 mm) nominal body width. The internal package registry maps this alias to 20-SOIC and expects 20-SOIC.jpg. Confirm the exact manufacturer's mechanical drawing, pin-1 orientation and land pattern before layout.

Layout checks

• Check the wide-body SOIC outline against the exact ordering code.
• Keep photodiode input routing short and balanced.
• Place power decoupling and sampling components per the device application circuit.

The registered local package JPG is missing. It must be supplied and reviewed before this page can be published.

These functional groups describe the manufacturer architecture, not numbered pin assignments. Consult the original AD880AJR pin diagram before designing a footprint or schematic symbol.

No pin numbers are inferred from the functional description.

Values are legacy descriptive specifications, not a guarantee at unspecified supply, load or temperature conditions. Use the applicable original datasheet for electrical limits.

A substitute must be checked for detector geometry, photodiode-current range, transimpedance, servo arithmetic, normalization transfer function, sampling behavior, supply rails, pinout and package. A similar part number or optical-disk application alone does not establish drop-in compatibility.

No internal alternative-product link is shown because no replacement ordering code and matching database URL were verified.

Analog Devices described the AD880 family in its legacy Special Linear Reference Manual as an optical-disk servo/data-channel processing element. The A-revision ordering code must be checked against its own datasheet for electrical limits and lifecycle status.

Confirm lot traceability, original manufacturer marking, the exact JR order code, package outline and handling history before procurement. Current authorized stock and tier pricing could not be established from a reliable exact-part listing; request a written quotation and inspect the received lot.

This legacy analog IC requires design-specific review of detector currents, servo-loop behavior, external capacitors, power supply, thermal conditions and exact package pinout. Do not treat this draft as a procurement or PCB-release approval. The package JPG and trustworthy present-day supply quotation remain outstanding.