Analog Devices Inc. AD8124ACPZ-RL

Overview

AD8124ACPZ-RL from Analog Devices is a triple-channel, high-speed differential video receiver and adaptive equalizer designed for RGB/YPbPr signal recovery over lossy UTP or coaxial cables up to 200 meters. It delivers 37 dB peak gain at 100 MHz, 8 ns rise/fall time with 2 V step at 200 m Cat-5, and supports UXGA+ resolutions in KVM and digital signage systems.

For engineers reviewing the AD8124ACPZ-RL datasheet, AD8124ACPZ-RL pinout, AD8124ACPZ-RL application, or AD8124ACPZ-RL equivalent, key selection considerations include adjustable cable-length compensation (VPEAK/VGAIN/VPOLE), DC output offset control (VOFFSET), dual on-chip comparators for sync extraction, and LFCSP-40 thermal performance at −40°C to +85°C.

Technical Context

The AD8124ACPZ-RL implements a unity-gain, three-stage analog equalization architecture with voltage-controlled peaking (VPEAK), broadband flat gain (VGAIN), and pole location adjustment (VPOLE) to invert the frequency-dependent attenuation of UTP/coaxial cables. Its high-impedance differential inputs (3.7 MΩ diff, 4.4 MΩ common-mode) interface directly with cable without external termination.

Each channel features independent +IN/−IN pairs and buffered outputs capable of driving 150 Ω loads; two integrated comparators with 70 mV hysteresis and 17.5 ns propagation delay support common-mode sync extraction per AD8134/AD8142 driver standards. Power-down mode reduces supply current to sub-µA levels.

Key Specifications

Pinout & Package

AD8124ACPZ-RL is housed in a 6 mm × 6 mm, 40-lead LFCSP package with exposed thermal pad requiring solder connection to PCB ground plane for θ_JA = 29°C/W (4-layer board).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triple differential video equalizer applications.

Compared with AD8124ACPZ-RL, AD8129ARUZ offers higher bandwidth but lacks multi-channel integration and cable-type flexibility, while LMH0384SQ/NOPB serves a fundamentally different domain (serial digital vs. parallel analog), making neither a drop-in substitute - AD8124ACPZ-RL remains uniquely suited for adaptive, multi-channel analog video equalization with sync extraction.

Availability

AD8124ACPZ-RL is available at Aetrix Electronics and suitable for RGB video over UTP, professional video distribution, KVM extension systems, and security surveillance monitoring requiring stable component supply across extended temperature ranges and long-lifecycle deployments.

Supply support for AD8124ACPZ-RL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design and manufacturing expertise spanning precision amplifiers, data converters, and high-speed interface ICs.

The AD8124ACPZ-RL belongs to Analog Devices' high-speed video signal conditioning product line, engineered specifically for analog RGB/YPbPr equalization in long-cable, noise-prone environments such as digital signage and broadcast infrastructure.

FAQ

What is the maximum supported cable length for AD8124ACPZ-RL with full equalization?

The AD8124ACPZ-RL is specified to fully compensate for transmission losses in UTP and coaxial cables up to 200 meters, as validated using Belden BL-7987R cable and Cat-5 infrastructure. At this length, it maintains 52 MHz −3 dB bandwidth and 8 ns rise/fall time with 2 V step input, enabling UXGA resolution support. Performance beyond 200 m is not characterized in the official datasheet Rev. A.

How does the VPOLE pin affect equalization behavior in AD8124ACPZ-RL?

The VPOLE pin in AD8124ACPZ-RL adjusts the pole locations within the equalizer's transfer function, allowing optimization for different cable types - e.g., shifting VPOLE enables better match to UTP versus 75 Ω coaxial characteristics. Per Figure 16 and Figure 17, VPOLE scales linearly with VPEAK (e.g., VPOLE ≈ 0.76 × VPEAK − 0.41 V for coax), giving designers flexibility beyond fixed-peaking architectures.

Can AD8124ACPZ-RL be used with single-ended coaxial inputs?

Yes, AD8124ACPZ-RL supports single-ended operation on coaxial cable: its high-impedance differential input accepts unbalanced 75 Ω signals when terminated per Figure 24 (75 Ω to ground on one input, other input grounded or biased). This configuration retains full equalization capability and is explicitly validated in the Applications Information section for 75 Ω video cable use cases.

What is the purpose of the two comparators in AD8124ACPZ-RL?

The two comparators in AD8124ACPZ-RL are designed for common-mode sync pulse extraction from RGB signals encoded by drivers like AD8134 or AD8142. Each comparator has 70 mV hysteresis and <0.03 Ω output impedance, enabling direct source-termination into 50 Ω or 75 Ω lines - eliminating external sync receivers and simplifying PCB layout in KVM and broadcast systems.

Does AD8124ACPZ-RL support power-down functionality, and how is it implemented?

Yes, AD8124ACPZ-RL includes a dedicated PD (Power Down) pin that places the device in ultra-low-power state when driven logic-high (>1.1 V). In powered-down mode, positive and negative supply currents drop to 1.1 µA and 0.7 µA respectively, while all outputs enter high-impedance state. This feature enables dynamic power gating in systems requiring intermittent video link activation.