AD8108ASTZ

Overview

The AD8108ASTZ is an 8 × 8 buffered video crosspoint switch manufactured by Analog Devices Inc. It operates on ±5 V supplies with a typical idle current of 45 mA. The device features a −3 dB bandwidth of 325 MHz and a slew rate of 400 V/µs. It provides excellent video performance with differential gain and phase errors better than 0.02% and 0.02°, respectively, and all-hostile crosstalk of −83 dB at 5 MHz. The unit supports serial or parallel programming for matrix configuration and includes output disable capabilities to facilitate daisy-chaining larger arrays. It is housed in an 80-lead LQFP package and functions within an operating temperature range of −40°C to +85°C.

Feature Summary

• High-speed nonblocking 8x8 switch array with integrated buffered outputs
• Supports both serial and parallel digital control interfaces for matrix programming
• Low power consumption with only 45 mA idle current draw
• Includes reset pin functionality for disabling all outputs simultaneously

Applications

• Routing composite video signals (NTSC, PAL, S, SECAM)
• Switching component video formats (YUV, RGB)
• Handling compressed video standards (MPEG, Wavelet)
• Processing 3-level digital video signals (HDB3)

Procurement Notes

Verify the specific suffix ASTZ against the manufacturer's ordering guide to confirm the industrial temperature range and lead-free status. Ensure that the required evaluation board, such as the AD8108-EB, is available if hardware validation is necessary for the design. Confirm that the 80-lead LQFP footprint matches the target PCB layout constraints.

Selection Notes

Select the AD8108ASTZ when a unity gain configuration is required for the crosspoint switches. If a gain of two is needed instead, consider the pin-compatible AD8109 variant. Verify that the system can accommodate the dual ±5 V supply requirement and that the 80-lead LQFP package size fits the mechanical enclosure limits.

Part Context

This component belongs to the AD8108/AD8109 family of high-speed video crosspoint switches. It shares architectural similarities with the AD8110 and AD8111 series but offers a distinct 8x8 topology compared to their 16x8 configurations. The device is designed to interface directly with standard video sources and displays without requiring external buffering amplifiers.

Replacement Considerations

The AD8109ASTZ serves as a direct functional substitute if a voltage gain of two is acceptable. For larger matrix requirements, the AD8116 provides a 16x16 configuration. Designers should verify that any replacement maintains the same 80-lead LQFP footprint and ±5 V supply specifications.