Analog Devices Inc. AD8120ACPZ-R7

Overview

AD8120ACPZ-R7 from Analog Devices is a triple-channel, broadband analog video delay line designed to correct channel-to-channel skew in RGB/YPbPr signals transmitted over unshielded twisted pair (UTP) cables. It delivers up to 50 ns per-channel adjustable delay in 0.8 ns steps, supports 200 MHz bandwidth at zero delay, features independent analog/digital (SPI/I²C) control per channel, and drives four double-terminated 75 Ω video loads - enabling precise timing alignment in KVM and digital signage systems.

For engineers reviewing the AD8120ACPZ-R7 datasheet, AD8120ACPZ-R7 pinout, AD8120ACPZ-R7 application, or AD8120ACPZ-R7 equivalent, key selection considerations include its 32-lead 5 mm × 5 mm LFCSP package, ±5 V dual supply operation, −40°C to +85°C industrial temperature range, 0.8% gain matching, and 30 mV RTI offset matching - all critical for high-resolution video signal integrity in UTP-based distribution infrastructure.

Technical Context

The AD8120ACPZ-R7 implements a cascaded switched-capacitor analog delay architecture with three independent channels, each providing monotonic 0.8 ns resolution across 64 digital codes (0–63), corresponding to 0–50 ns total adjustable delay. Its fixed gain of 2 V/V and high differential input impedance (500 kΩ) preserve signal fidelity without external gain-setting components.

Delay control is implemented via three mutually exclusive modes: analog voltage inputs (VCR/VCG/VCB, 0–2 V range), 4-wire SPI bus (10 MHz max clock), or I²C bus (100 kHz standard mode). The MODE and SER_SEL pins configure the active interface, while PD enables power-down (4 mA quiescent current), and the exposed thermal pad ensures stable thermal performance under full-load operation.

Key Specifications

Pinout & Package

AD8120ACPZ-R7 is housed in a 32-lead, 5 mm × 5 mm lead-frame chip-scale package (LFCSP) with exposed thermal pad. Pin 1 is located at top-left corner (see Figure 3); exposed pad must be soldered to PCB ground or power plane for thermal and electrical stability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triple-channel analog video delay applications.

Compared with AD8120ACPZ-R7, AD8123ARUZ addresses cable loss rather than skew, requiring co-deployment for full UTP compensation, while LMH0384SQ/NOPB serves digital serial video domains and cannot replace AD8120ACPZ-R7's analog triple-channel delay functionality.

Availability

AD8120ACPZ-R7 is available at Aetrix Electronics and suitable for RGB video over UTP, KVM extension systems, and digital signage distribution requiring stable component supply, long-term lifecycle assurance, and industrial-grade temperature performance.

Supply support for AD8120ACPZ-R7 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and communications.

The AD8120ACPZ-R7 belongs to Analog Devices' high-speed video conditioning product line, engineered specifically for timing-critical analog video infrastructure where channel skew degrades image quality in UTP-based transmission systems.

FAQ

What is the maximum delay resolution supported by the AD8120ACPZ-R7?

The AD8120ACPZ-R7 provides 0.8 ns delay resolution per least-significant bit (LSB) across its full 0–50 ns range, achieved through a monotonic switched-capacitor delay architecture. This resolution corresponds to 64 discrete delay codes (0–63), enabling sub-pixel timing alignment critical for high-definition RGB video without interpolation artifacts or edge smearing in the AD8120ACPZ-R7.

Can the AD8120ACPZ-R7 operate with single-supply voltage?

No, the AD8120ACPZ-R7 requires dual ±5 V supplies (±4.5 V to ±5.5 V operating range) to support its ±3.25 V output swing and internal analog circuitry. It does not support single-supply operation; attempting to power it from a single rail will result in undefined behavior, output clipping, or damage. The AD8120ACPZ-R7 is specified only for symmetric dual-supply configurations per its Absolute Maximum Ratings table.

How does analog control work on the AD8120ACPZ-R7?

Analog control on the AD8120ACPZ-R7 uses three dedicated pins - VCR, VCG, and VCB - each accepting 0–2 V input to set red, green, and blue channel delays independently. An internal ADC converts these voltages into 6-bit digital codes with 28 mV/LSB sensitivity. Setting MODE = high enables this mode, eliminating need for microcontrollers in simple manual-tuning applications using potentiometers - a key feature distinguishing the AD8120ACPZ-R7 from purely digital alternatives.

What is the purpose of the exposed thermal pad on the AD8120ACPZ-R7 package?

The exposed thermal pad on the AD8120ACPZ-R7's 32-lead LFCSP package must be soldered to a PCB copper plane to achieve θJA = 36°C/W and sustain full 3.5 W power dissipation at 85°C ambient. It serves both thermal management (reducing junction temperature rise) and electrical grounding (low-inductance return path for high-frequency video currents). Leaving it unconnected violates the Absolute Maximum Ratings and risks parametric shift or thermal shutdown in the AD8120ACPZ-R7.

Does the AD8120ACPZ-R7 support I²C multi-master operation?

No, the AD8120ACPZ-R7 implements a slave-only I²C interface with fixed 7-bit address (0x38) plus two configurable address bits (A0/A1), allowing up to four devices on one bus. It does not support multi-master arbitration, clock stretching, or repeated START conditions beyond standard read/write sequences. The AD8120ACPZ-R7 responds only to valid address matches and ACKs transmissions - consistent with its role as a peripheral timing component, not a bus controller.