AD8120ACPZ-R2

Overview

The AD8120ACPZ-R2 is a triple skew-compensating video delay line designed to correct time mismatches in unshielded twisted pair cables. It provides up to 50 ns of adjustable delay per channel with 0.8 ns resolution across 64 digital steps. The device operates on ±5 V supplies, drawing 44 mA at zero delay and 114 mA at maximum delay. It features a fixed gain of 2, a bandwidth ranging from 150 MHz to 200 MHz depending on the delay setting, and supports SPI, I2C, or analog voltage control.

Feature Summary

• Corrects for unshielded twisted pair cable skew using independent red, green, and blue delay controls
• Supports digital control via standard SPI or I2C buses alongside analog voltage adjustment options
• Drives four double-terminated video loads with low output offset and excellent channel-to-channel matching

Applications

• Keyboard-video-mouse (KVM) systems
• RGB video transmission over UTP cables
• Professional video projection and distribution networks
• Security video surveillance infrastructure

Procurement Notes

Verify the specific suffix R2 against the manufacturer's ordering guide to confirm packaging configuration. Ensure the design accommodates the required dual power supply rails and thermal dissipation needs for the LFCSP package. Confirm interface compatibility with the host controller's serial protocols before finalizing procurement.

Selection Notes

Select this component when precise alignment of RGB or YPbPr signals is required after transmission through Category 5 or 6 cabling. Consider the trade-off between bandwidth and delay length, as higher delay settings reduce the -3 dB video signal bandwidth. Verify that the host system can support the necessary digital control logic or provide stable analog reference voltages.

Part Context

This device belongs to the Analog Devices AD8120 family of broadband skew-compensating delay lines. It is specifically engineered for high-resolution video applications where timing discrepancies between color channels must be minimized. The part integrates both digital and analog control interfaces within a compact surface-mount package.

Replacement Considerations

The AD8120 is designed to function in conjunction with the AD8123 triple UTP equalizer. While no direct single-pin replacements are documented, systems requiring similar triple-channel delay compensation should evaluate other members of the AD81xx video IC series for functional equivalence.

FAQ

How does the AD8120 handle delay control?

The device offers three control methods: a 4-wire SPI bus, an I2C bus, or analog control voltages applied to the VCR, VCG, and VCB pins. The MODE and SER_SEL pins determine which method is active.

What is the impact of delay setting on bandwidth?

The video signal bandwidth varies with the delay code. At 0 ns delay, the bandwidth is 200 MHz, while at the maximum 50 ns delay, it decreases to 150 MHz.