Analog Devices Inc. AD80052BR

Overview

AD80052BR from Analog Devices is a phase-locked loop (PLL) clock recovery and data retiming IC designed for NRZ serial data streams at 51.84 Mbps (STS-1). It performs frequency acquisition and phase lock without preamble or external VCXO, delivers differential recovered clock and retimed data outputs, and operates on single –5.2 V or +5 V supply across –40°C to +85°C.

For engineers reviewing the AD80052BR datasheet, AD80052BR pinout, AD80052BR application, or AD80052BR equivalent, key selection criteria include its 51.84 MHz nominal center frequency, 0.1% fractional loop bandwidth, ±20% VCO center-frequency tolerance in free-run mode, 0.08 dB jitter peaking at ζ = 5, and support for ECL-compatible differential I/O with 208° peak-to-peak random jitter performance.

Technical Context

The AD80052BR implements a second-order PLL architecture with dual control loops: a frequency detector enables rapid initial frequency acquisition, followed by a patented phase detector for precise phase lock. Its loop damping is user-programmable via external capacitor CD (0.15 µF nominal for ζ = 5), directly governing jitter peaking (0.08 dB) and acquisition time (4 × 10⁵ bit periods).

It accepts NRZ input without preamble, generates differential CLKOUT and DATAOUT signals referenced to analog/digital ground planes, and provides FRAC output pulses during frequency slip events-enabling lock-status monitoring. The integrated, trimmed VCO eliminates external tuning components and ensures ±20% center-frequency stability in absence of input data.

Key Specifications

Pinout & Package

AD80052BR is housed in a 20-pin plastic SOIC package (R-20), 0.300" wide, with 1.27 mm pitch. Pin 1 is marked by bevelled corner; pins are arranged in two rows (1–10 top, 11–20 bottom), with dedicated analog/digital substrate and ground pins for noise isolation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar clock recovery applications.

Compared with AD800-45BQ and AD802-155BR, the AD80052BR offers optimized jitter peaking (0.08 dB) and acquisition time (4×10⁵ bits) specifically for STS-1, with industrial temperature support and SOIC packaging for cost-sensitive telecom line cards.

Availability

AD80052BR is available at Aetrix Electronics and suitable for SONET/SDH line card timing, DS-3 to STS-1 mapping interfaces, and telecom test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD80052BR 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 is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, communications, and industrial applications.

The AD800/AD802 product line was developed specifically for telecom clock recovery and data retiming in NRZ serial links, targeting STS-1, DS-3, and STM-1 standards with integrated VCOs and dual-loop PLL architectures.

FAQ

What is the nominal center frequency of the AD80052BR and how is it used?

The AD80052BR has a nominal center frequency of 51.84 MHz, matching the STS-1/OC-1 telecom standard. This value defines the VCO's free-run frequency and establishes the PLL's tracking and capture range (49–53 Mbps). During operation, the loop dynamically adjusts the VCO around this center to lock onto incoming NRZ data, making the AD80052BR suitable for STS-1 framer and mapping applications.

Does the AD80052BR require an external crystal or VCXO to operate?

No, the AD80052BR does not require an external crystal or VCXO. It integrates a precisely trimmed VCO that provides a clock output within ±20% of 51.84 MHz in the absence of input data. Lock acquisition relies solely on the internal frequency detector and phase detector, eliminating external timing components and simplifying board design for STS-1 clock recovery.

How is loop damping configured on the AD80052BR?

Loop damping on the AD80052BR is set using a single external capacitor connected between pins CF1 and CF2. A 0.15 µF capacitor yields a damping factor (ζ) of 5, resulting in 0.08 dB jitter peaking and 4 × 10⁵ bit-period acquisition time. Values can be adjusted to trade faster lock (lower ζ) against lower jitter peaking (higher ζ), with scaling governed by √(f_DATA × C_D).

What is the function of the FRAC output on the AD80052BR?

The FRAC (Frequency Acquisition) output on the AD80052BR is a differential signal that pulses during cycle slips between the input data and VCO frequencies. It indicates active frequency acquisition; pulses cease once frequency lock is achieved, signaling the start of phase acquisition. Engineers use FRAC to monitor lock status and synchronize downstream logic, as valid retimed data is guaranteed after the last FRAC pulse.

What supply voltage options does the AD80052BR support?

The AD80052BR supports single-supply operation at either –5.2 V (VEE) or +5 V (VCC), with all specifications guaranteed across –40°C to +85°C. The –5.2 V configuration uses ECL-compatible logic levels (VIH = –0.72 V, VOL = –1.60 V), while the +5 V mode requires level-shifting circuitry. Decoupling mandates a 10 µF tantalum capacitor on VEE/VCC and 0.1 µF ceramics on each power pin.