AD8124ACPZ-R7

Overview

The AD8124ACPZ-R7 is a triple, high-speed differential receiver and equalizer designed to compensate for transmission losses in UTP and coaxial cables up to 200 meters. It features an 8 ns rise/fall time with a 2 V step at 200 meters of UTP cable and provides 37 dB peak gain at 100 MHz. The device operates on ±4.5 V to ±5.5 V supplies with a quiescent current of 132 mA. It includes adjustable control pins (VPEAK, VGAIN, VPOLE) for frequency response shaping and a VOFFSET pin for DC output adjustment. The component supports RGB and YPbPr signals, offers low output offset voltage (24 mV), and integrates two comparators with hysteresis for common-mode sync extraction.

Feature Summary

• Compensates transmission losses for UTP and coaxial cables up to 200 meters using adjustable frequency response shaping.
• Integrates two on-chip comparators with built-in hysteresis for common-mode sync pulse extraction.
• Features three independent control voltages (VPEAK, VGAIN, VPOLE) to optimize compensation for varying cable lengths and types.
• Provides DC output offset adjustment via the VOFFSET pin to enhance flexibility in DC-coupled systems.

Applications

• Keyboard-video-mouse (KVM) systems
• Digital signage displays
• RGB video transmission over UTP cables
• Professional video projection and distribution
• HD video and security video applications

Procurement Notes

Verify the specific ordering suffix R7 indicates reel packaging when sourcing components. Confirm that the LFCSP-40 package requires proper thermal connection of the exposed underside pad to achieve specified thermal resistance. Ensure supply voltages remain within the ±4.5 V to ±5.5 V range during operation. Check for moisture sensitivity handling requirements prior to assembly.

Selection Notes

Select this component for applications requiring long-distance video signal restoration over twisted pair or coaxial media. The adjustable gain stages allow optimization for both short-to-medium length low-noise scenarios and maximum 200-meter equalization. Consider the integrated comparators if sync extraction is needed without external logic. Verify compatibility with the required RGB or YPbPr signal formats and ensure adequate power supply filtering for stable performance.

Part Context

The AD8124 belongs to Analog Devices' family of triple differential receivers and drivers for video applications. It complements drivers like the AD8148 by providing the receiving end equalization necessary for complete transmission links. The device addresses the need for high-bandwidth signal integrity in professional AV and KVM environments where cable attenuation significantly impacts image quality.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.

FAQ

How does the AD8124 handle noise for short versus long cable lengths?

Internal logic circuitry controls the gain functions of individual stages to achieve the lowest noise at short-to-medium cable lengths while providing the high gain bandwidth required for longer cable equalization up to 200 meters.

What is the function of the VPOLE pin?

The VPOLE pin allows movement of the pole locations to compensate for different gauges and types of cables, as well as variations between different cables and/or equalizers.

Can the AD8124 be used with coaxial cable?

Yes, the device can be optimized for either UTP or coaxial cable using the VPEAK, VGAIN, and VPOLE control pins to adjust the frequency response accordingly.