Analog Devices Inc. LTC6953IUKG#TRPBF

Overview

LTC6953IUKG#TRPBF from Analog Devices is an ultralow-jitter, 4.5GHz JESD204B/C clock distributor IC with eleven CML outputs, individually programmable dividers (1–4096), coarse digital delays (0–4095 half-cycles), and fine analog delays (0–1100ps). It supports precise phase alignment across all outputs and enables SYSREF generation for high-speed data converters in wireless infrastructure and test equipment.

For engineers reviewing the LTC6953IUKG#TRPBF datasheet, LTC6953IUKG#TRPBF pinout, LTC6953IUKG#TRPBF application, or LTC6953IUKG#TRPBF equivalent, key selection criteria include additive jitter ≤6fsRMS (12kHz–20MHz), ±25ps output skew, 11-output synchronization via EZSync/ParallelSync, and operation over –40°C to 125°C junction temperature.

Technical Context

The LTC6953IUKG#TRPBF integrates a high-fidelity input buffer accepting 4.5GHz differential signals, eleven independent CML output drivers with configurable MODEx modes (clock or SYSREF), and dual-stage delay architecture-digital coarse delay (½-cycle resolution) plus analog fine delay (11ps/26ps step size up to 1100ps). All outputs support synchronized startup and phase alignment.

Its multichip synchronization relies on EZSync™ (daisy-chain) or ParallelSync™ (parallel bus) protocols, enabling deterministic timing coordination across multiple LTC6953s, LTC6952s, and LTC6955s. SYSREF generation is implemented via dedicated EZS_SRQ inputs and internal divider/delay control per output channel.

Key Specifications

Pinout & Package

Package: 52-lead (7mm × 8mm) plastic QFN (UKG) with exposed thermal pad (Pin 53 = GND). Requires soldering to PCB ground plane with thermal vias for thermal management at full load.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC6957IUKG#TRPBF and Si5341-A01A-GM, the LTC6953IUKG#TRPBF uniquely delivers 4.5GHz CML outputs with 6fsRMS additive jitter and deterministic multichip synchronization-making it irreplaceable for JESD204C subclass 2 and high-frequency RF sampling systems.

Availability

LTC6953IUKG#TRPBF is available at Aetrix Electronics and suitable for high-speed data converter timing, wireless infrastructure transceivers, automated test equipment, and high-fidelity signal generators requiring stable component supply across extended temperature ranges.

Supply support for LTC6953IUKG#TRPBF 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, serving precision instrumentation, communications, and industrial markets.

The LTC6953IUKG#TRPBF belongs to Analog Devices' ultralow-jitter clock distribution product line, engineered specifically for JESD204B/C-compliant high-speed data converter systems demanding deterministic latency and sub-picosecond timing accuracy.

FAQ

What is the maximum input frequency supported by the LTC6953IUKG#TRPBF?

The LTC6953IUKG#TRPBF supports a maximum input frequency of 4.5GHz on its differential IN+/IN– pins. This is specified under absolute maximum ratings and confirmed in electrical characteristics (fIN = 4500MHz). The input buffer maintains proper operation up to this frequency with 0.25–1.6VP-P single-ended swing and 100V/µs minimum slew rate. Operation beyond 4.5GHz is not guaranteed and may degrade jitter performance or cause functional failure.

Does the LTC6953IUKG#TRPBF support JESD204C subclass 2 timing requirements?

The LTC6953IUKG#TRPBF supports JESD204C subclass 2 through its programmable digital and analog output delays, precise phase alignment capability, and EZSync/ParallelSync multichip synchronization protocols. While the datasheet explicitly confirms JESD204B/C subclass 1 support, subclass 2 compliance is enabled by the device's ability to achieve <1ns deterministic latency variation across outputs and <10µs inter-device skew-verified in typical application circuits using LTC6952Wizard and measured skew data (±25ps intra-chip, ±50ps inter-chip).

How many independent output dividers does the LTC6953IUKG#TRPBF provide?

The LTC6953IUKG#TRPBF provides eleven independent output dividers (M0 through M10), each programmable from 1 to 4096 in integer steps. Each divider operates on its respective output channel and supports any integer value expressible as P × 2^N, where P = 1–32 and N = 0–7. This allows flexible frequency synthesis-for example, generating 15.625MHz SYSREF from a 4.5GHz input using Mx = 288-without affecting other outputs.

What package type and thermal requirements apply to the LTC6953IUKG#TRPBF?

The LTC6953IUKG#TRPBF uses a 52-lead plastic QFN (UKG) package measuring 7mm × 8mm with an exposed thermal pad (Pin 53). Per the datasheet, this pad must be soldered directly to the PCB ground plane using an array of thermal vias to maintain junction temperature ≤125°C under full load. Thermal resistance is θJC = 2°C/W and θJA = 31°C/W; airflow or heat sinking is recommended under maximum operating conditions.

Can the LTC6953IUKG#TRPBF generate both device clocks and SYSREF signals simultaneously?

Yes, the LTC6953IUKG#TRPBF can generate up to five JESD204B/C subclass 1 device clock/SYSREF pairs plus one general-purpose clock output-or eleven independent general-purpose clocks. Each output is configured via MODEx bits: MODEx = 0 for clock mode (up to 4.5GHz), MODEx = 1/2/3 for SYSREF modes (up to 150MHz). This allows simultaneous distribution of 500MHz DAC clocks and 15.625MHz SYSREF signals on separate outputs with precise phase alignment.