Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

Part Number	Description / PDF	Quantity
AD9518-1BCPZ-REEL7 Analog Devices, Inc.	PLL CLOCK DRIVER, 9518 SERIES	8990
AD9516-4BCPZ Analog Devices, Inc.	IC CLOCK GEN 1.6GHZ VCO 64-LFCSP	444
AD809BR-REEL7 Analog Devices, Inc.	CLOCK GENERATOR, 155.52MHZ, ECL	2680
ADF4355-3BCPZ Analog Devices, Inc.	IC INTEGRATED SYNTH/VCO 32LFCSP	627
MAX9491ETP080+ Analog Devices, Inc.	MAX9491 FACTORY-PROGRAMMABLE, SI	8586
ADF4106SRUZ-EP Analog Devices, Inc.	IC PLL FREQ SYNTHESIZER 16TSSOP	57
ADF4153YCPZ-RL Analog Devices, Inc.	PLL FREQUENCY SYNTHESIZER	5000
ADF4150BCPZ-RL7 Analog Devices, Inc.	IC PLL FREQ SYNTH 5.0GHZ 24LFCSP	1888
ADF4360-4BCPZ Analog Devices, Inc.	IC SYNTHESIZER VCO 24LFCSP	67
ADF4118BRUZ-RL7 Analog Devices, Inc.	IC PLL RF FREQ SYNTHESZR 16TSSOP	1144
MAX9491ETP080+T Analog Devices, Inc.	MAX9491 FACTORY-PROGRAMMABLE, SI	15000
AD9516-0BCPZ-REEL7 Analog Devices, Inc.	CLOCK DRIVER, 9516 SERIES, 10 TR	4000
DS1091LUB-066+ Analog Devices, Inc.	CLOCK GENERATOR, 66.6MHZ, CMOS,	12791
ADF4360-8BCP Analog Devices, Inc.	PHASE LOCKED LOOP WITH VCO	9684
LTC6948IUFD-4#PBF Analog Devices, Inc.	IC FRACTIONAL-N PLL W/VCO 28QFN	593
ADF4193BCPZ Analog Devices, Inc.	IC PLL FREQ SYNTHESIZER 32LFCSP	0
ADF4117BRUZ Analog Devices, Inc.	IC PLL RF FREQ SYNTHESZR 16TSSOP	32
LTC6948IUFD-1#TRPBF Analog Devices, Inc.	IC FRACTIONAL-N PLL W/VCO 28QFN	0
ADF4107BRUZ-REEL7 Analog Devices, Inc.	IC PLL FREQ SYNTHESIZER 16TSSOP	1135
DS21602N Analog Devices, Inc.	3.3V/5V CLOCK RATE ADAPTER	6528

Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

1. Overview

Clock and timing ICs are semiconductor devices that generate, regulate, and distribute timing signals in electronic systems. Key components include Clock Generators (produce stable clock signals), Phase-Locked Loops (PLLs, synchronize signals with phase alignment), and Frequency Synthesizers (generate precise frequencies from reference signals). These devices ensure synchronization across components in modern electronics, enabling reliable operation in communication systems, computing devices, and industrial equipment.

2. Main Types and Functional Classification

Type	Functional Features	Application Examples
Clock Generators	Produce fixed or programmable clock signals with low jitter	Microprocessors, FPGAs, networking equipment
PLLs	Align output signal phase with reference input, enable frequency multiplication	Wireless transceivers, data recovery circuits
Frequency Synthesizers	Generate multiple frequencies from single reference with high precision	5G base stations, satellite communication systems

3. Structure and Components

Typical clock ICs feature: 1) Crystal oscillator interface for reference signal input; 2) Internal voltage-controlled oscillator (VCO); 3) Phase detector and loop filter (PLL components); 4) Programmable dividers; 5) Output buffers. Advanced packages include QFN (4x4mm to 8x8mm) and TSSOP with 8-48 pins. Integration levels vary from single-channel devices to multi-output clock generators with integrated EEPROM.

4. Key Technical Specifications

Parameter	Typical Range	Importance
Frequency Range	1 kHz - 3.6 GHz	Determines application compatibility
Phase Noise	-150 to -120 dBc/Hz	Impacts signal integrity
Jitter (RMS)	50 fs - 1 ps	Critical for high-speed systems
Power Consumption	10-300 mA	Affects thermal design
Temperature Stability	20-100 ppm	Ensures reliability in harsh environments

5. Application Fields

Telecommunications: 5G NR base stations, optical transceivers
Computing: Server motherboards, PCIe clocks
Industrial: Precision test equipment, motor control systems
Automotive: ADAS sensors, infotainment systems
Medical: MRI imaging systems, patient monitoring devices

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
TI (Texas Instruments)	LMX2594	15-GHz wideband PLL with integrated VCO
Analog Devices	AD9548	4-channel clock generator with 0.1 ppb accuracy
STMicroelectronics	CLK2692	Programmable 2-output synthesizer for automotive
Microchip	ZL30264	High-performance network synchronizer

7. Selection Guidelines

Key selection criteria: 1) Required output frequency and voltage levels; 2) Acceptable phase noise/jitter specifications; 3) Number of required outputs; 4) Operating temperature range; 5) Power budget constraints; 6) Integration level (e.g., single-chip vs. discrete VCO solutions). For wireless applications, prioritize low phase noise. For portable devices, emphasize power efficiency.

8. Industry Trends

Future developments include: 1) Higher integration with on-chip EEPROM and multi-phase outputs; 2) Advancement to sub-10fs jitter performance; 3) Development of radiation-hardened variants for aerospace; 4) Adoption of 3D packaging for reduced EMI; 5) Increased use of AI-enabled dynamic frequency scaling. The market is projected to grow at 7.2% CAGR through 2027 driven by 5G and automotive electrification.