AD8109ASTZ

Overview

The AD8109ASTZ is an 8 × 8 buffered video crosspoint switch manufactured by Analog Devices Inc. It features a gain of +2 and operates on ±5 V supplies with a typical idle current of 45 mA. The device provides a −3 dB bandwidth of 250 MHz, a slew rate of 480 V/µs, and low crosstalk of −83 dB at 5 MHz. It supports serial or parallel programming for matrix configuration and includes output disable capabilities to facilitate daisy-chaining larger arrays.

Feature Summary

• High-speed nonblocking 8x8 switch array architecture
• Integrated buffered outputs with selectable gain
• Flexible serial and parallel control interfaces
• Low power consumption design

Applications

• Routing composite video signals (NTSC, PAL, S, SECAM)
• Switching component video formats (YUV, RGB)
• Handling compressed video standards (MPEG, Wavelet)

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and temperature range. Ensure compatibility with ±5 V supply requirements and TTL-compatible logic levels for control signals. Confirm that the selected variant meets the necessary thermal dissipation constraints for the intended application environment.

Selection Notes

Select the AD8109ASTZ when a voltage gain of +2 is required for the video signal path. Compare performance metrics such as bandwidth and crosstalk against the AD8108 if unity gain is sufficient. Consider the pin compatibility with 16x8 switch arrays if future scalability to larger matrices is anticipated within the same system design.

Part Context

This component belongs to the AD8108/AD8109 family of high-speed video crosspoint switches. It shares a common core architecture with the AD8108 but differs in its internal feedback network to provide a fixed gain of +2. The devices are designed to drive standard 150 Ω back-terminated video loads directly.

Replacement Considerations

The AD8108ASTZ serves as a direct functional alternative if a gain of +1 is acceptable. For larger matrix configurations, the AD8110/AD8111 16x8 arrays offer pin-compatible expansion options.